CN104438433A - Manufacture process of thin-wall U-shaped bend pipe with small bending radius - Google Patents
Manufacture process of thin-wall U-shaped bend pipe with small bending radius Download PDFInfo
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- CN104438433A CN104438433A CN201410597788.9A CN201410597788A CN104438433A CN 104438433 A CN104438433 A CN 104438433A CN 201410597788 A CN201410597788 A CN 201410597788A CN 104438433 A CN104438433 A CN 104438433A
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- extrusion die
- pipe fitting
- die
- pipe
- bending
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- 238000005452 bending Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 103
- 238000001192 hot extrusion Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims description 26
- 239000004576 sand Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 230000001737 promoting effect Effects 0.000 claims description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The invention discloses a manufacture process of a thin-wall U-shaped bend pipe with small bending radius. The manufacture process comprises the following steps: (A) filling sands: filling sands into a pipe fitting fully and closing two ends; (B) prebending: assembling the pipe fitting on a top-upsetting pipe-bending machine: clamping one end of the pipe fitting by a top-upsetting clamp, fixing the other end of the pipe fitting by a pipe bending mold and a clamping block, driving the pipe bending mold to rotate by a main shaft, applying axial pushing force to the top-upsetting clamp by an oil cylinder, and enabling the pipe fitting to be bent to have the preset bending radius R1; (C) hot extrusion: heating the pipe fitting to preset temperature, placing the pipe fitting into an extrusion mold to be extruded to have the bending radius R0, then placing into a forming mold with a U-shaped cavity, extruding the pipe fitting to enter a cavity formed by an upper mold piece and a lower mold piece through mold closing, thereby realizing forming, wherein the final bending radius of the pipe fitting is R0, and R0<R1; D) removing end covers at two ends of the pipe fitting and the sands in the pipe. According to the manufacture process, the deformation of the bend pipe can be reduced, the ball-through diameter requirement can be met, the rate of finished product is high, the working procedures are less, the processing operation is simple, the cycle is short and the production cost is low.
Description
Technical field
The present invention relates to a kind of manufacture craft for thin-walled small-bend radius U-bend.
Background technology
In some gasification furnaces, Ni-based stainless U-shaped (180 °) elbow (as φ 38X4), its bending radius (R20 and R25) is little, tube wall is thin, compared with the electricity generation boiler of standard, hot-fluid in equipment for gasification is larger, and appropriate current are key parameters, and therefore logical ball requires to be much higher than plain cylindrical furnace and ASME related standards; The manufacture craft of existing thin-walled small-bend radius U-bend mainly contains two kinds: after 1) carrying out pre-bending on stretch bending bending machine or side propelling assisting elbow pipe machine, hot extrusion molding again; The method is when pre-bending due to bend loss madial wall pressurized, lateral wall tension, and the cut-off in outside is comparatively large, and its circularity is poor, and the logical bulb diameter of follow-up finished product reduces; When hot extrusion, because wall is thin, poor rigidity, easy unstability wrinkling deformation, madial wall easily thickens, and logical bulb diameter is also affected, and cause this index to be difficult to reach requirement, percent defective is high; 2) adopt making U-shaped solid forging, be shaped by machined U-shaped through hole again; Although the logical bulb diameter of the method can be up to standard, there is the shortcoming that processing step is many, difficulty of processing is large, the cycle is long, cost is high.
Summary of the invention
For the technical problem of above-mentioned existence, the invention provides a kind of manufacture craft of thin-walled small-bend radius U-bend, it can reduce the distortion of bend pipe, meet the requirement of logical bulb diameter, and yield rate is high, and few, the easy processing of operation, cycle are short, and production cost is lower.
In order to achieve the above object, the manufacture craft of thin-walled small-bend radius U-bend of the present invention, is characterized in that comprising the following steps: A) fill sand: in pipe fitting, fill up sand material, and close the two-port of pipe fitting by end cap, B) pre-bending: pipe fitting is loaded on heading pipe bender: one end of heading folder clamping pipe fitting, the other end of pipe fitting is fixed by bending die and fixture block, bending die is driven to rotate by main shaft, oil cylinder applies axial thrust to heading folder simultaneously, curved operation being pushed away to pipe fitting, making the curved bending radius to presetting in the middle part of pipe fitting be 180 elbows ° of R1, C) hot extrusion: by pipe heating to preset temperature, put into extrusion die extruding: extrusion die is by upper, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die composition, adjustment is left, the distance of right side extrusion die is to adapt to the bending radius of elbow, on, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are provided with the inclined-plane matched, on, lower back mould is provided with deformable cavity, upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are equipped with the die cavity that cross section is arc, the elbow both sides straight tube of pipe fitting is put into extrusion die die cavity, on, lower extrusion die matched moulds clamps two straight section tube portions, the extrusion die promoting both sides moves inward, go up simultaneously, lower back mould moves backward, heel does Free Transform until form 180 ° of elbows that bending radius is R0, pipe fitting is put into shaping mould again: shaping mould comprises upper and lower module, upper and lower module is equipped with U-shaped die cavity, the die cavity of U-shaped die cavity elbow section is approximate half-circular, the depth capacity of this place's die cavity is slightly less than the half of its width, pipe fitting is pressed into the die cavity after upper and lower module matched moulds, complete shaping, by the shaping of elbow section to radius of curvature R 0, R0< R1, D) sand material in pipe fitting two ends end cap and pipe is removed,
The present invention, due to when pre-bending, applies axial thrust to pipe fitting, elbow section lateral wall also pressurized by oil cylinder, heading folder, and the cut-off of lateral wall is less or be zero, and the circularity of elbow section is better; Sand material is filled up in pipe fitting, the rigidity of pipe fitting can be improved, the tube wall not easily Instability wrinkling distortion when pre-bending and heating extrusion process, the amplitude that thickens of madial wall also reduces, and the depth capacity adding upper module U-shaped die cavity elbow section is slightly less than the half of its width, thickening of madial wall can be reduced further during shaping, improve circularity, above all can reduce bend pipe distortion, the requirement that meets logical bulb diameter, yield rate is high, and few, the easy processing of operation, cycle are short, production cost is lower;
Preferred as one of the present invention, in step B) and C) between be also provided with preheating extrusion process: by pipe heating to preset temperature, put into extrusion die extruding: extrusion die is by upper, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die composition, adjustment is left, the distance of right side extrusion die is to adapt to the bending radius of elbow, on, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are provided with the inclined-plane matched, on, lower back mould is provided with deformable cavity, upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are equipped with the die cavity that cross section is arc, the elbow both sides straight tube of pipe fitting is put into extrusion die die cavity, on, lower extrusion die matched moulds clamps two straight section tube portions, the extrusion die promoting both sides moves inward, go up simultaneously, lower back mould moves backward, the spacing of the extrusion die of both sides determines bending radius, heel does Free Transform until form 180 ° of elbows that bending radius is R2, pipe fitting is put into shaping mould again: shaping mould comprises upper and lower module, upper and lower module is equipped with U-shaped die cavity, the die cavity of U-shaped die cavity elbow section is approximate half-circular, the depth capacity of this place's die cavity is slightly less than the half of its width, pipe fitting is pressed into the die cavity after upper and lower module matched moulds, complete shaping, by the shaping of elbow section to radius of curvature R 2, R0<R2< R1, set up pre-hot extrusion, deflection during hot extrusion molding can be reduced further, improve circularity,
Preferred as one of the present invention, pipe fitting is forward and reverse is pressed into the die cavity after upper and lower module matched moulds for twice, carries out shaping; Shaping effect can be improved;
In sum, the present invention can reduce the distortion of bend pipe, meet the requirement of logical bulb diameter, and yield rate is high, and few, the easy processing of operation, cycle are short, and production cost is lower.
Accompanying drawing explanation
Fig. 1 is the partial perspective view implementing heading pipe bender of the present invention.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the front view of the extrusion die implementing the pre-hot extrusion of the present invention and hot extrusion operation.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the front view implementing lower module in the pre-hot extrusion of the present invention and hot extrusion operation shaping mould.
Fig. 6 is the B-B sectional view of Fig. 5.
Detailed description of the invention
Below in conjunction with accompanying drawing, U-shaped (180 °) elbow being R20 for Ni-based φ 38X4 tube manufacture bending radius, the present invention is further detailed explanation to require logical bulb diameter >=φ 21.5.
The manufacture craft of this thin-walled small-bend radius U-bend, comprises the following steps: A) fill sand: in pipe fitting, fill up sand material, as corundum sand, and closed the two-port of pipe fitting by end cap, B) pre-bending: as shown in Figure 1 to Figure 2, is loaded on heading pipe bender by pipe fitting 1: one end of heading folder 2 clamping pipe fitting 1, and the other end of pipe fitting 1 is fixed by bending die 3 and fixture block 4, and bending die 3 and fixture block 4 are provided with the arc groove matched, drive bending die 3 to rotate by main shaft 5, oil cylinder 6 pairs of heading folders 2 apply axial thrust simultaneously, press from both sides 2 pairs of pipe fittings 1 push away curved operation by heading, make the curved bending radius to presetting in the middle part of pipe fitting 1 be 180 ° of elbows of R57, C) pre-hot extrusion: the pipe fitting 1 of pre-bending is heated to preset temperature, put into extrusion die extruding: as shown in Figure 3 to Figure 4, extrusion die comprises the upper back of the body mould 12 at middle part, lower back mould 13 and upper left extrusion die 14, lower-left extrusion die 15, upper right extrusion die 16 and bottom right extrusion die 17, adjustment is left, right side extrusion die distance to adapt to the bending radius of elbow, upper back of the body mould 12, lower back mould 13 and upper left extrusion die 14, lower-left extrusion die 15, upper right extrusion die 16 and bottom right extrusion die 17 are provided with the inclined-plane matched, upper back of the body mould 12, lower back mould 13 is provided with deformable cavity, upper left extrusion die 14, lower-left extrusion die 15, upper right extrusion die 16 and bottom right extrusion die 17 are equipped with the die cavity 18 that cross section is arc, the both sides straight tube of pipe fitting 1 are put into extrusion die 14 and lower-left extrusion die 15 in matched moulds rear left, in the die cavity of upper right extrusion die 16 and bottom right extrusion die 17, on, lower extrusion die matched moulds clamps two straight section tube portions, is moved inward by the extrusion die of oil cylinder pushing both sides, simultaneously by inclined-plane being carried on the back mould 12, lower back mould 13 moves backward, and the spacing of the extrusion die of both sides determines that the bending radius of elbow, heel do Free Transform until form 180 ° of elbows that bending radius is R38, pipe fitting 1 is put into shaping mould again: shaping mould comprises upper and lower module, the structure of upper and lower module is identical and be oppositely arranged, as shown in Figure 5 to Figure 6, its lower module 10 is equipped with U-shaped die cavity 11, the die cavity of U-shaped die cavity 11 elbow section is approximate half-circular, and the depth capacity a of this place's die cavity is slightly less than the half of its width b, and pipe fitting 1 is forward and reverse is pressed into the die cavity after upper and lower module matched moulds for twice, complete shaping, by curved for elbow to radius of curvature R 38, D) hot extrusion: by pipe heating to preset temperature, put into step C) identical extrusion die extruding, moved inward by the extrusion die of oil cylinder pushing both sides, just now the spacing of the extrusion die of both sides is less, and heel does Free Transform until form 180 ° of elbows that bending radius is R20, pipe fitting is put into shaping mould again, the die cavity of its U-shaped die cavity 11 elbow section is approximate half-circular, and the depth capacity a of this place's die cavity is slightly less than the half of its width b, and pipe fitting 1 is forward and reverse is pressed into the die cavity after upper and lower module matched moulds for twice, complete shaping, by curved for elbow to radius of curvature R 20, E) sand material in pipe fitting two ends end cap and pipe is removed,
The present invention, due to when pre-bending, is pressed from both sides 2 pairs of pipe fittings 1 by oil cylinder 6, heading and is applied axial thrust, elbow section lateral wall also pressurized, and the cut-off of lateral wall is less or be zero, and the circularity of elbow section is better; Sand material is filled up in pipe fitting 1, the rigidity of pipe fitting 1 can be improved, the tube wall not easily Instability wrinkling distortion when pre-bending, in advance hot extrusion and hot extrusion operation, the amplitude that thickens of madial wall also reduces, the depth capacity a adding upper module U-shaped die cavity elbow section is slightly less than the half of its width b, thickening of madial wall can be reduced further, improve circularity, the above distortion that all can reduce bend pipe; The Specifications that table one detects for adopting products obtained therefrom of the present invention, table two be adopt stretch bending bending machine or side propelling assisting elbow pipe machine carry out pre-bending after, the Specifications of hot extrusion molding products obtained therefrom detection again;
Table one
Table two
Can being found by the contrast of above-mentioned two table Testing index, adopting the logical bulb diameter of traditional diamond-making technique products obtained therefrom far below requiring, and the easy unstability of bend pipe, wrinkling; All be greater than the index φ 21.5 of requirement by the minimum logical bulb diameter of products obtained therefrom of the present invention, yield rate is high, and few, the easy processing of operation, cycle are short, and production cost is lower;
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a manufacture craft for thin-walled small-bend radius U-bend, is characterized in that comprising the following steps: A) fill sand: in pipe fitting, fill up sand material, and close the two-port of pipe fitting by end cap, B) pre-bending: pipe fitting is loaded on heading pipe bender: one end of heading folder clamping pipe fitting, the other end of pipe fitting is fixed by bending die and fixture block, bending die is driven to rotate by main shaft, oil cylinder applies axial thrust to heading folder simultaneously, curved operation being pushed away to pipe fitting, making the curved bending radius to presetting in the middle part of pipe fitting be 180 elbows ° of R1, C) hot extrusion: by pipe heating to preset temperature, put into extrusion die extruding: extrusion die is by upper, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die composition, adjustment is left, the distance of right side extrusion die is to adapt to the bending radius of elbow, on, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are provided with the inclined-plane matched, on, lower back mould is provided with deformable cavity, upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are equipped with the die cavity that cross section is arc, the elbow both sides straight tube of pipe fitting is put into extrusion die die cavity, on, lower extrusion die matched moulds clamps two straight section tube portions, the extrusion die promoting both sides moves inward, go up simultaneously, lower back mould moves backward, heel does Free Transform until form 180 ° of elbows that bending radius is R0, pipe fitting is put into shaping mould again: shaping mould comprises upper and lower module, upper and lower module is equipped with U-shaped die cavity, the die cavity of U-shaped die cavity elbow section is approximate half-circular, the depth capacity of this place's die cavity is slightly less than the half of its width, pipe fitting is pressed into the die cavity after upper and lower module matched moulds, complete shaping, by the shaping of elbow section to radius of curvature R 0, R0< R1, D) sand material in pipe fitting two ends end cap and pipe is removed.
2. the manufacture craft of thin-walled small-bend radius U-bend according to claim 1, is characterized in that: in step B) and C) between be also provided with preheating extrusion process: by pipe heating to preset temperature, put into extrusion die extruding: extrusion die is by upper, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die composition, adjustment is left, right side extrusion die distance to adapt to the bending radius of elbow, on, lower back mould and upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are provided with the inclined-plane matched, on, lower back mould is provided with deformable cavity, upper left extrusion die, lower-left extrusion die, upper right extrusion die and bottom right extrusion die are equipped with the die cavity that cross section is arc, and the elbow both sides straight tube of pipe fitting is put into extrusion die die cavity, on, lower extrusion die matched moulds clamps two straight section tube portions, and the extrusion die promoting both sides moves inward, and goes up simultaneously, lower back mould moves backward, and heel does Free Transform until form 180 ° of elbows that bending radius is R2, pipe fitting is put into shaping mould again: shaping mould comprises upper and lower module, upper and lower module is equipped with U-shaped die cavity, the die cavity of U-shaped die cavity elbow section is approximate half-circular, the depth capacity of this place's die cavity is slightly less than the half of its width, pipe fitting is pressed into the die cavity after upper and lower module matched moulds, complete shaping, by the shaping of elbow section to radius of curvature R 2, R0<R2< R1.
3. the manufacture craft of the thin-walled small-bend radius U-bend according to claim 1 or 2, is characterized in that: pipe fitting is forward and reverse is pressed into the die cavity after upper and lower module matched moulds for twice, carries out shaping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410597788.9A CN104438433B (en) | 2014-10-31 | 2014-10-31 | The processing technology of thin-walled small-bend radius U-bend |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410597788.9A CN104438433B (en) | 2014-10-31 | 2014-10-31 | The processing technology of thin-walled small-bend radius U-bend |
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| CN104438433B CN104438433B (en) | 2016-08-31 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057420A (en) * | 2015-06-26 | 2015-11-18 | 江苏新恒基特种装备股份有限公司 | Multi-bending bent pipe precision bending device |
| CN106064187A (en) * | 2016-08-19 | 2016-11-02 | 安徽德系重工科技有限公司 | A kind of wound form drawing heading pipe bender |
| CN106111828A (en) * | 2016-08-19 | 2016-11-16 | 安徽德系重工科技有限公司 | A kind of heading pipe bender slope climbing type clamping device and using method thereof |
| CN106270239A (en) * | 2016-08-30 | 2017-01-04 | 桐庐千丁科技有限公司 | A kind of thin-walled short U bend pipe automatic moulding machine of band weld-ring |
| CN106311824A (en) * | 2016-08-19 | 2017-01-11 | 安徽德系重工科技有限公司 | Independent reset device for master mold of heading pipe bender and use method thereof |
| CN109201882A (en) * | 2017-06-29 | 2019-01-15 | 马力 | 180 ° of cold-extruded elbow roll moulds |
| 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 |
| CN114535479A (en) * | 2022-03-01 | 2022-05-27 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Forging method of large arc die forging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057420A (en) * | 2015-06-26 | 2015-11-18 | 江苏新恒基特种装备股份有限公司 | Multi-bending bent pipe precision bending device |
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| CN106270239A (en) * | 2016-08-30 | 2017-01-04 | 桐庐千丁科技有限公司 | A kind of thin-walled short U bend pipe automatic moulding machine of band weld-ring |
| CN106270239B (en) * | 2016-08-30 | 2018-01-30 | 桐庐千丁科技有限公司 | A kind of short U bend pipes automatic moulding machine of the thin-walled with weld-ring |
| CN109201882A (en) * | 2017-06-29 | 2019-01-15 | 马力 | 180 ° of cold-extruded elbow roll moulds |
| 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 |
| CN114535479A (en) * | 2022-03-01 | 2022-05-27 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Forging method of large arc die forging |
| CN114535479B (en) * | 2022-03-01 | 2023-11-28 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Forging method of large arc die forging |
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| CN104438433B (en) | 2016-08-31 |
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