CN101972914B - Manufacture method for bending crooked pipe - Google Patents
Manufacture method for bending crooked pipe Download PDFInfo
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- CN101972914B CN101972914B CN2010101732973A CN201010173297A CN101972914B CN 101972914 B CN101972914 B CN 101972914B CN 2010101732973 A CN2010101732973 A CN 2010101732973A CN 201010173297 A CN201010173297 A CN 201010173297A CN 101972914 B CN101972914 B CN 101972914B
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Abstract
The invention relates to the technical field of the manufacture of common accessories for pipeline connection, in particular to a manufacture method for bending a crooked pipe by utilizing a reverse deformation process. The invention adopts a reverse deformation principle and pre-deforms the bending part by a flattening process so that pre-deformed shape of a product is basically trimmed after a forming process. The manufacture method for bending the crooked pipe, which is provided by the invention, has simple process and high product percent of pass, fillings are convenient to take out without residue, and a processed product has a replete surface. The invention solves the technical problems of complicated process, great power need, product filling residue and high manufacture cost in the prior art.
Description
Technical field
The present invention relates to the manufacturing technology field that a kind of pipeline connects accessory commonly used, relate in particular to a kind of manufacturing approach of utilizing reversible deformation technology to bend crooked pipe.
Background technology
Now a lot of pipe fittings will must rely on the overlapping of horizontal vertical straight tube to accomplish across pipeline in the middle of pipeline connects, and brings a lot of inconvenience for the cross-distribution of pipeline.In order to practice thrift the pipeline installing space, the problems referred to above have been solved through the crooked pipe road.The processing method of traditional crooked pipe is to adopt to irritate plumbous filling, carries out moulding through pushing away mould again.Need through blanking, molten lead, filling lead, moulding, deleading, enlarging, this 7 procedure of scarfing operation; Product surface also need use the mode of pickling to remove lead residual in the pipe; Product surface has gauffer to a certain degree, and the product inwall has more serious pulling, and needs the follow-up polishing process that appends; Overall acceptability rate less than 93%, and molten lead, filling lead and deleading technique can cause certain influence to the environment of plant.Because the part easy deformation that when pushing away mould, bends is a flat, so this technology in order to guarantee that crooked pipe can not be out of shape when pushing away mould, is wanted in pipe fitting, to irritate plumbous earlier before pushing away mould.But the shortcoming of this technology is to need power big, and owing to be to push away mould again after filling, filler remains in easily and is difficult in the product remove so; Not enough environmental protection; The cost that manufactures a product is than higher, and product surface and inwall have to a certain degree gauffer and draw trace, and profile is also attractive in appearance inadequately.
Summary of the invention
It is simple to the invention provides a kind of technology, filler noresidue convenient to remove, and processing back product surface is full, the manufacturing approach that bends crooked pipe that product percent of pass is high; Solved the complex procedures that exists in the prior art, required drive is big, and the filler of product has residual, the technical problem that manufacturing cost is high.
Above-mentioned technical problem of the present invention solves through following technical proposals: a kind of manufacturing approach that bends crooked pipe is characterized in that:
The first step, blanking uses cutting machine to cut theoretical length of run and the allowance sum of the length of the pipe fitting under the feasible cutting of soft attitude pipe fitting as pipe fitting, and described allowance is 1%～10% of theoretical length of run;
In second step, the whole flattening or local the flattening is pressed into elliptical shape with flattening mould in the part that on the hydraulic press pipe integral body after the first step incised is pressed into elliptical shape or will bend;
In the 3rd step, moulding with formed product, is put into mould with the pipe fitting after the flattening of second step with mould, promotes the position bending of core rod with the needs bending of straight tube, the long axis direction of the pipe fitting of the direction of motion of core rod after flattening;
The 4th step; Shaping; The pipe fitting that the 3rd step formed is put into shaping mould, utilize core rod that the shaping filler is packed into then and make the surperficial full of pipe fitting in the pipe fitting, expand the two ends of pipe fitting to the bellmouth size simultaneously; By taking out the pipe fitting be filled with the shaping filler in the mould, then with the shaping filler by taking out in the pipe fitting;
In the 5th step, scarfing cuts off pipe fitting two ends redundance with instrument lathe, makes the bellmouth length of pipe fitting satisfy standard-required.
Soft attitude pipe fitting processing toughness is strong, and the pipe fitting of doing the bend pipe class must use soft attitude pipe, and the definition to soft attitude copper pipe in standard GB/T 18033 is that hardness is 40 ~ 75HV/5.The theoretical length of pipe fitting is the length of pipe fitting its center line under normal condition.Standard-required in the 5th step is according to requirement of client, and the country variant standard is adopted in copper pipe fitting production, and GB, Europe superscript, Australia's mark, U.S. mark etc. are arranged, and plumbing red copper pipe fitting current national standard is GB/T 11618-2008.
The manufacturing of the crooked pipe of materials such as that crooked pipe technology of the present invention is applicable to is copper, irony and stainless steel.The present invention has adopted the reversible deformation principle; Because flattening process has carried out predeformation to the bending part, make product after the molding procedure distortion, basically predeformation is repaired; Here it is need limit the angle that pipe fitting is placed in the mould in the 3rd step; The direction of motion of core rod is the long axis direction along pipe fitting, and then utilizes filler that product cavity is carried out after the bulging through shaping enlarging operation, and the surface is very full; Do not have fold and cut, need not carry out other surface grinding operation the surface.The operational sequence reversed in order of operation of the present invention and prior art is to push away mould earlier, and then utilizes filler to carry out shaping; The product of this operation manufacturing was owing to did preliminary treatment, and little at bending part stress, intensity is good; Long service life, and the simple operation easily of whole technology.Flatten technology and can adopt whole the flattening, simple to operation, good stability; Also can adopt local the flattening as required, the deflection of the body of the both sides of reduction bending part makes subsequent technique conveniently carry out.
As preferably, the allowance in the described first step is 2% ~ 4% of theoretical length of run; The major axis of ellipticity pipe is 5:3 with the ratio of minor axis in described second step.Carry out revisal according to the deflection in predeformation amount and the molding procedure and adjust the degree that pipe fitting flattens.
As preferably, the mould in described the 3rd step is divided into upper and lower mould and core rod, and at first with on die frame hydraulic press fortunately, according to the height adjustment core rod stroke of crooked pipe, the product after will flattening is again put into counterdie, on pipe fitting, is stained with lubricating oil during placement.The bending angle of the crooked pipe of different size is different, and according to the stroke of the angle adjustment core rod that bends, the lubricating oil that adds a little during placement can prevent that the pipe fitting placement is unstable.
As preferably, the shaping filler in described the 4th step is the polyurethane rod, the polyurethane rod is inserted pipe fitting one end carry out chamfered, and the diameter of polyurethane rod is littler by 3%～7% than the diameter of bore of pipe fitting.Adopt polyurethane to avoid the residual contamination that draws trace and filler of product inwall as filler.The diameter of polyurethane rod can utilize rubber bar to release the polyurethane filling block in the product less than pipe fitting easily.
Therefore; A kind of manufacturing approach that bends crooked pipe of the present invention has following advantage: 1, utilize the reversible deformation principle, carry out predeformation earlier, in molding procedure, revisal is to a certain degree carried out in distortion then; Reduce the difficulty of trimming, improved the qualification rate of product; 2, accomplish the processing of product through blanking, flattening, moulding, shaping, 5 operations of scarfing, technology is simple, and is easy to operate, improved operating efficiency; 3, residual packing in pipe fitting has been avoided in shaping after the first moulding, and environment protecting is good; 4, filler adopts diameter less than the pipe fitting internal diameter, has avoided the trace that draws of product inwall, and product surface is very full, does not have fold and cut, does not need to do in addition the surface grinding operation.
Description of drawings
Fig. 1 is the matched moulds sketch map in the 3rd step of the present invention.
Fig. 2 pushes away the core sketch map for the 3rd step of the present invention.
Fig. 3 is the decomposing schematic representation in the 4th step of the present invention.
The specific embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of invention.
Embodiment: a kind of manufacturing approach that bends crooked pipe, the length of pipe fitting processed are 105mm, and the height of bending segment is 29mm, and this highly is the distance of middle top to the bellmouth center line, and diameter is 15.88mm, and material thickness is 0.9mm.The first step, blanking cuts to soft attitude copper tube with cutting machine on the theoretical length of run basis of product and adds 2% surplus; In second step, the whole flattening will descend the pipe of honest material to be pressed into the elliptical shape of 5:3 on hydraulic press with flattening mould; As illustrated in fig. 1 and 2, the 3rd step, moulding; The mould that utilization is divided into patrix 1, counterdie 2 and core rod 3 three parts carries out moulding process to pipe fitting 4; On die frame hydraulic press fortunately,, be 29mm such as the height of the crooked pipe dogleg section that will process according to the stroke of the good core rod of height adjustment of crooked pipe; Till the stroke of core rod 3 adjusted to product and can put into the shaping die cavity smoothly, and the size dimension in shaping mould chamber is processed according to the finished product external dimensions fully.Pipe fitting after then integral body being flattened is placed on the counterdie 2; Outer surface with pipe fitting during placement is stained with a little lubricating oil; The long axis direction that will guarantee pipe fitting simultaneously is consistent with the direction of motion of core rod, with guarantee in pushing away the core process on predeformation in the step carry out revisal to a certain degree.Open the matched moulds key, make upper and lower mould close up (shown in direction A in scheming), cylinder puts the core rod top (shown in direction B in scheming) in place under opening again, moves back core then, and pipe fitting is taken out in die sinking; As shown in Figure 3, the 4th step, shaping; 9 pairs of pipe fittings of mould that employing possesses upper die and lower die, left enlarging core rod 6 and right enlarging core rod 7 carry out shaping, and upper and lower mould is fixed on the bolster of the hydraulic press of 40 tonnages, in pipe fitting 4, fill the polyurethane rod 5 of φ 13.4mm then; The diameter of rod is littler by about 5% than pipe fitting internal diameter, and the front end that polyurethane is excellent carries out chamfering, two sections polyurethane rods is put into the lower mode cavity of shaping mould from the two ends of pipe fitting; After primer fluid cylinder pressure upper cylinder half pressed down matched moulds, primer fluid press side cylinder made two ends enlarging fuse do relative motion, regulates the location; Let polyurethane just fill up product cavity, make product surface full, the two ends with product utilize left and right sides core rod to expand the bellmouth size to simultaneously; Take out pipe fitting, the polyurethane filler that hand-held diameter is released in the pipe fitting less than the rubber bar 8 of product internal diameter; In the 5th step, scarfing cuts off pipe fitting two ends redundance with instrument lathe, makes product bellmouth length satisfy standard-required.
Find through our company's repetition test and contrast, adopt traditional filling lead method to produce crooked pipe, through blanking, molten lead, filling plumbous (waiting cooling), moulding, deleading, enlarging, scarfing operation, 7 each classes of procedure can be produced 1100 products.The pipe fitting surface also need use the mode of pickling to remove lead residual in the pipe, and product surface has gauffer to a certain degree, and the product inwall has more serious pulling, and needs the follow-up polishing process that appends, overall acceptability rate less than 93%.And molten lead, filling lead and deleading technique can cause certain influence to the environment of plant, and residual lead is difficult to remove fully in the product.And adopt reversible deformation technology to make crooked pipe, and through blanking, flattening, moulding, shaping and scarfing operation, 5 each classes of procedure can be produced 4000, and product is full, have non-wrinkled surfaces, and inner wall smooth, the overall acceptability rate reaches more than 98%.Thereby it is simple to have verified that this method is made the crooked pipe operation, and production efficiency is high, product is attractive in appearance, product percent of pass is high, the advantage of manufacture process environmental protection.Existing our company has popularized in an all-round way and has used this method to make copper crooked pipe.
Embodiment 2:
Be with embodiment 1 different place; The first step in the present embodiment; Blanking; With cutting machine soft attitude copper tube is cut on the theoretical length of run basis of product and add 3% surplus, second step was adopted local the flattening, promptly was pressed into elliptical shape with flattening mould at the position that on the hydraulic press pipe after the first step incised need be bent.Remainder is identical with embodiment 1.
Claims (5)
1. manufacturing approach that bends crooked pipe is characterized in that:
The first step, blanking uses cutting machine to cut theoretical length of run and the allowance sum of the length of the pipe fitting under the feasible cutting of soft attitude pipe fitting as pipe fitting, and described allowance is 1%～10% of theoretical length of run;
In second step, the whole flattening or local the flattening is pressed into elliptical shape with flattening mould in the part that on the hydraulic press pipe integral body after the first step incised is pressed into elliptical shape or will bend;
The 3rd step; Moulding with formed product, is put into mould with the pipe fitting after the flattening of second step with mould; Promote the position bending of core rod with the needs bending of straight tube; The long axis direction of the pipe fitting of the direction of motion of core rod after flattening, described long axis direction is for flattening rear tubular member cross section oval in shape, this oval-shaped long axis direction;
The 4th step; Shaping; The pipe fitting that the 3rd step formed is put into shaping mould, utilize core rod that the shaping filler is packed into then and make the surperficial full of pipe fitting in the pipe fitting, expand the two ends of pipe fitting to the bellmouth size simultaneously; By taking out the pipe fitting be filled with the shaping filler in the mould, then with the shaping filler by taking out in the pipe fitting;
In the 5th step, scarfing cuts off pipe fitting two ends redundance with instrument lathe, makes the bellmouth length of pipe fitting satisfy standard-required.
2. a kind of manufacturing approach that bends crooked pipe according to claim 1 is characterized in that: the allowance in the described first step is 2%～4% of theoretical length of run.
3. a kind of manufacturing approach that bends crooked pipe according to claim 1 and 2 is characterized in that: the major axis of ellipticity pipe is 5:3 with the ratio of minor axis in described second step.
4. a kind of manufacturing approach that bends crooked pipe according to claim 1 and 2; It is characterized in that: the mould in described the 3rd step is divided into upper and lower mould and core rod; At first with on die frame hydraulic press fortunately; According to the height adjustment core rod stroke of crooked pipe, the product after will flattening is again put on the counterdie, on pipe fitting, is stained with lubricating oil during placement.
5. a kind of manufacturing approach that bends crooked pipe according to claim 1 and 2; It is characterized in that: the shaping filler in described the 4th step is the polyurethane rod; The polyurethane rod is inserted pipe fitting one end carry out chamfered, the diameter of polyurethane rod is littler by 3%～7% than the diameter of bore of pipe fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101732973A CN101972914B (en) | 2010-05-17 | 2010-05-17 | Manufacture method for bending crooked pipe |
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| CN2010101732973A CN101972914B (en) | 2010-05-17 | 2010-05-17 | Manufacture method for bending crooked pipe |
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| CN101972914A CN101972914A (en) | 2011-02-16 |
| CN101972914B true CN101972914B (en) | 2012-07-04 |
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| CN2010101732973A Expired - Fee Related CN101972914B (en) | 2010-05-17 | 2010-05-17 | Manufacture method for bending crooked pipe |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102728744A (en) * | 2012-07-04 | 2012-10-17 | 上海依赛工业有限公司 | Forming method of car rear cover elbow and positioning fixture special for welding |
| CN105855344B (en) * | 2015-01-21 | 2019-05-24 | 保隆(安徽)汽车配件有限公司 | The forming method of minor radius bend pipe |
| CN111185722B (en) * | 2018-11-15 | 2021-09-17 | 核工业西南物理研究院 | U-shaped bending forming method for asymmetric flat plate with runner |
| CN110385954A (en) * | 2019-07-31 | 2019-10-29 | 天人汽车底盘（芜湖）股份有限公司 | The stamping forming antifatigue torsion beam of control |
| CN110576074A (en) * | 2019-08-19 | 2019-12-17 | 河北欧姆隆机械有限公司 | manufacturing process of flattened bent pipe |
| CN110788581A (en) * | 2019-12-10 | 2020-02-14 | 昆山新莱洁净应用材料股份有限公司 | Manufacturing method of elbow |
| CN113799316A (en) * | 2020-06-17 | 2021-12-17 | 五行科技股份有限公司 | Method for manufacturing composite board |
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2010
- 2010-05-17 CN CN2010101732973A patent/CN101972914B/en not_active Expired - Fee Related
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| US5526670A (en) * | 1993-10-29 | 1996-06-18 | Borletti Climatizzazione Srl | Process and device for shaping the end of a tube with an oblong cross-section to a circular cross-section |
| CN1343874A (en) * | 2000-09-14 | 2002-04-10 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Method for bend measuring tube |
| CN1559717A (en) * | 2004-03-04 | 2005-01-05 | 张先荣 | Method for correcting workpiece crosssection shape of pipe bended by pipe bending machine |
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| CN101972914A (en) | 2011-02-16 |
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Owner name: ZHEJIANG TIANQING PIPE CO., LTD. Free format text: FORMER OWNER: ZHEJIANG TIANXING PIPE FITTING CO., LTD. Effective date: 20141216 |
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Effective date of registration: 20141216 Address after: 312300 Industrial Zone, Kunlun Town, Shangyu District, Zhejiang, Shaoxing Patentee after: ZHEJIANG TIANQING PIPE MANUFACTURE CO., LTD. Address before: 313100, No. 6, development road, Changxing County Economic Development Zone, Huzhou, Zhejiang Patentee before: Zhejiang Tianxing Pipe Fitting Co., Ltd. |
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Granted publication date: 20120704 Termination date: 20190517 |