CN101972795B - Machining process of metal elbow - Google Patents
Machining process of metal elbow Download PDFInfo
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- CN101972795B CN101972795B CN2010102783949A CN201010278394A CN101972795B CN 101972795 B CN101972795 B CN 101972795B CN 2010102783949 A CN2010102783949 A CN 2010102783949A CN 201010278394 A CN201010278394 A CN 201010278394A CN 101972795 B CN101972795 B CN 101972795B
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- pipe fitting
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- water filling
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Abstract
The invention belongs to the machining field of metal tubular products, in particular to a machining process of a metal elbow. The process comprises the following five steps of: blanking, forming, bulging, flaring and scarfing. The process comprises the following steps of: firstly, fully soaking a machining pipe fitting in water by utilizing a hydraulic bulging principle, pushing a mold core for bulging by a lateral cylinder of a hydraulic press to advance and enter the machining pipe fitting; then, adding water toward the machining pipe fitting through a one-way valve and continuously pushing the mold core for bulging toward the center of the machining pipe fitting; deforming the tubular product and forcing the surface of the machining pipe fitting to be attached to a mold cavity together by the inner R dent and the outer R dent of the machining pipe fitting along with increased pressure in the machining pipe fitting when the pressure in the machining pipe fitting exceeds the maximum working pressure of the tubular product so as to reach the product bulging requirement. The invention can finish the production of the elbow through four procedures, improves the working efficiency, avoids dents on the product surface in flaring because rubber filling is not filled in the product, and does not need a subsequent surface polishing procedure.
Description
Technical field
The invention belongs to the manufacture field of metal pipe material, be specifically related to a kind of processing technology of metal bends.
Background technology
Present domestic production minor radius metal bends (radius of curvature R is less than 1D) has following several method: does not 1. have filling and push away curvedly, only be applicable to that diameter is a little R bend forming below the 25mm, can't implement for the product of poor ductility, for example stainless steel bend; 2. irritate plumbous (or other solid dielectrics, for example paraffin) and push away curvedly, the technology too complex needs product is sealed a port before curved pushing away, and pushes away curved back heating taking-up filler, and the product inwall is filled the serious scratch of thing; 3. (be designated hereinafter simply as: inside and outside R) surface is not full, has solved the problems referred to above through increase filler bulging for turn of bilge and bent out portion in the rubber bulging method of directly bending, elbow product produce in using trigonocephalia shaping mould forming process; 5. be to adopt the rubber bulging first time slightly littler by traditional expanding method, re-use core rod and carry out the enlarging second time than product internal diameter.Need through blanking, moulding, plug rubber, bulging, get rubber, enlarging, scarfing 7 procedures; During bulging product surface can be residual rubber powder during bulging; Need to increase follow-up matting; If in the bulging process, there is rubber to remain in the die cavity, can cause the product surface dolly dimple, need through follow-up polishing process; The rubber of filling usefulness is processed in the process of suitable size in the method for using cutting and grinding, and the dust of generation also can cause certain influence to the environment of plant.This technology is full in order to guarantee inside and outside R surface, need in pipe fitting, fill in the rubber suitable with its volume, owing to need carry out the secondary enlarging, makes product sequence increase, and needs to use a large amount of rubber, causes that cost of goods manufactured is high, efficient is low.
Summary of the invention
The object of the present invention is to provide a kind of processing technology of metal bends; This method speed is fast, operation is few; Consumptive material is few; Cost is low, and the inside and outside R of product processed surface is full, do not have depression, and product percent of pass is high, solved that the complex procedures, the filler consumptive material that exist in the prior art are many, product has that filler is residual, the technical problem of length consuming time.
Above-mentioned technical problem of the present invention solves through following technical proposals:
A kind of processing technology of metal bends may further comprise the steps:
The first step, blanking cuts into the pipe fitting of converted products elbow Len req with blanking machine with tubing, and two ends are cut into the shape of angular cut;
In second step, moulding is earlier with inserting the profiling core rod in the two ends of pipe fitting; Then pipe fitting is placed on two rollers of trigonocephalia lower mould; And the long up limit of the minor face that makes pipe fitting down, and the mid portion of pipe fitting faces the centre of two rollers, last matched moulds; Trigonocephalia patrix with the trigonocephalia mould is depressed the mid portion of pipe fitting, processes the bend pipe base;
The 3rd step, bulging, enlarging:
(1), the preparatory stage; Elder generation packs the enlarging mould in the one bulging water tank; Have two cinclides that can supply bulging on the sidewall of water tank, be fixed with sealing gasket around the cinclides, insert bulging core rod and the bloated pattern core of water filling in the cinclides respectively then with the core rod turnover; And the water filling pattern core that expands is connected with water filling device through connecting rod, last toward the required water of bulging water tank interior interpolation bulging;
(2), the execution phase, the bend pipe base is put into the die cavity of enlarging mould, matched moulds; After treating the pressure stability in the die cavity; Promote the bloated pattern core of bulging core rod and water filling simultaneously and get in the two ends mouth of pipe of bend pipe base, start water filling device simultaneously, continue to advance bulging core rod and the bloated pattern core of water filling that the pressure of the interior water of bend pipe base sharply is increased to above the tubing maximum working pressure (MWP) through the water filling in the bend pipe base of water filling bulging core rod; Close water filling device then; From the enlarging mould, withdraw from bulging and use core rod, the semi-finished product elbow is taken out in die sinking;
In the 4th step, scarfing cuts off semi-finished product elbow two ends redundance, makes the bellmouth length of finished product elbow satisfy standard-required.
As preferably; Described trigonocephalia mould is made up of trigonocephalia patrix and the counterdie with pair of parallel roller 4; Have half slot on the trigonocephalic end face of trigonocephalia patrix; The footpath of the roller of counterdie upwards also has half slot accordingly, and the radius of semi-round groove equals the radius of pipe fitting outer wall, and described trigonocephalia faces the centre of two rollers.
As preferably; Described enlarging mould is put together by two steel forms; Be provided with the die cavity of finished product elbow-shaped in the enlarging mould, the interior turn of bilge of die cavity and the radius of curvature R of bent out portion are identical with product, have the accent that communicates with die cavity on the adjacent dual-side of enlarging mould.
As preferably, described profiling core rod, integral body is cylinder, a side of head be provided with moulding after the curved surface that matches of pipe fitting bend, the end face of head is the plane, a side relative with curved surface on the end face is provided with chamfering.
As preferably; Described water filling device is made up of check valve, high-pressure overflow valve, pipeline, magnetic valve, storage tank and plunger displacement pump; Check valve is connected with connecting rod and storage tank respectively through pipeline; The end that pipeline is positioned at storage tank is connected with magnetic valve, and pipeline also is connected with high-pressure overflow valve, and high-pressure overflow valve is communicated with storage tank through return pipe; The delivery port of plunger displacement pump is connected with the water inlet of magnetic valve.
As preferably, described bulging core rod is made up of conical head, contraction flow region, barred body and joint portion, and described conical head is pyramid type approximately; The axis projection of conical head is circular, and conical head is surrounded by the first surface and second curved surface, and second curved surface is a working face; Second curved surface matches with the bent out portion of die cavity; Contraction flow region is between conical head and barred body, and contraction flow region is 45 ° a chamfering, and the joint portion is provided with screw thread.
As preferably, in described first step step,, also to the said pipe fitting that be slit into the angular cut shape be made annealing in process if the tubing that is adopted does not belong to soft attitude tubing, make said pipe fitting fall back on soft attitude.
As preferably, described die cavity and bulging with the surface roughness of core rod more than 0.8.
The elbow manufacturing of materials such as that the processing technology of metal bends of the present invention is applicable to is copper, irony and stainless steel.The present invention adopts hydraulic pressure bulging principle; Because the inside and outside R of product surface is not full in molding procedure; Product can be with bulging and synthetic 1 procedure of enlarging operation when the enlarging operation; After carrying out enlarging through the water method that expands; The inside and outside R of pipe fitting surface is full, the nothing depression, need not pass through the follow-up product cleaning and the polishing process on surface; This method manufactures a product, and speed is fast, qualification rate is high, and the simple operation easily of whole technology.
Therefore; The processing technology of a kind of metal bends of the present invention has following characteristic: 1, utilize hydraulic pressure bulging principle; To process pipe fitting earlier and immerse fully in the water, bulging advances under the promotion of hydraulic pressure pusher side cylinder with core rod and gets into the processing pipe fitting then, makes the processing tube intracavity be in sealing state.Pass through check valve again towards processing water filling in the pipe fitting, continue simultaneously bulging is advanced toward processing pipe fitting center with core rod, the interior pressure of die cavity will constantly increase;, processing pipe fitting internal pressure (for example, in seamless copper plumbing of GB/T18033 and the copper tracheae maximum working pressure (MWP) is calculated as P=2St/ (D-0.8t), wherein P=maximum working pressure (MWP) when surpassing the maximum working pressure (MWP) of tubing; S=material allowable stress is the used soft attitude copper pipe S=41.2MPa of elbow, and t is the material wall thickness; D is a tube outer diameter), tubing begins distortion, and the inside and outside R sunk part of processing pipe fitting is along with the increasing of processing pipe fitting internal pressure; Force the surface and the die cavity of processing pipe fitting to stick together; After the processing pipe fitting sticked together with die cavity fully, processing pipe fitting chamber pressure was during above setting value, and unnecessary water can overflow from high-pressure overflow valve.2, product only need pass through blanking, moulding, enlarging, scarfing 4 procedures, can accomplish the production of product, and 3, no rubber filler in the product, the depression of product surface when having avoided enlarging does not need follow-up surface finish operation; 4, product does not need plug, gets rubber, again with bulging and the synthetic one procedure of enlarging, has so just saved the process time of product.Technology of the present invention can be processed the metal bends of R=0.6-1.0D.
Description of drawings:
Fig. 1 is the structural representation of pipe fitting of the present invention;
View when Fig. 2 begins pipe fitting depressed for the present invention second step triangle head;
View when Fig. 3 was pressed into the bend pipe base with pipe fitting for the present invention in second step;
Fig. 4 is the schematic side view of Fig. 3;
Fig. 5 is the bend pipe blank structure sketch map behind the present invention's second one-step forming;
Fig. 6 is the 3rd a step bulging of the present invention, view when enlarging begins;
Fig. 7 is the 3rd a step bulging of the present invention, view when enlarging is accomplished;
Fig. 8 is a semi-finished product elbow structure sketch map of the present invention;
Fig. 9 is the structural representation of bulging core rod of the present invention;
Figure 10 is the structural representation of profiling core rod of the present invention.
Among the figure: trigonocephalia patrix 1, pipe fitting 2, profiling core rod 3, roller 4, enlarging mould 5, bulging core rod 6, connecting rod 7; Sealing ring 8, rubber blanket 9, bulging water tank 10, check valve 11, high-pressure overflow valve 12, pipeline 13, magnetic valve 14; Storage tank 15, angular cut 16, the water filling pattern core 17 that expands, water filling device 18, bend pipe base 19, semi-finished product elbow 20; Plunger displacement pump 21, counterdie 22, die cavity 51, accent 52, interior turn of bilge 54, bent out portion 53; Conical head 61, first surface 62, the second curved surfaces 63, contraction flow region 64, joint portion 65, barred body 66.
The specific embodiment
Be Φ 42mm to process a two ends diameter of bore below, thickness is that 90 ° the copper elbow of 1.5mm is embodiment, and combines accompanying drawing, and the present invention is further specified.
Shown in Fig. 1-10, the processing technology step is following:
The first step; Blanking cuts into the pipe fitting 2 of converted products elbow Len req with blanking machine with the copper pipe tubing of φ 42, and length is 120/160mm; For two edge lengths after making pipe fitting 2 moulding are consistent, need the two ends of pipe fitting 2 are cut into the shape (as shown in Figure 1) of angular cut 16 during blanking.If the copper pipe tubing that is adopted does not belong to soft attitude tubing (definition to soft attitude copper pipe among standard GB/T18033 is that hardness is 40-75HV/5), then to pipe fitting 2 be remake annealing in process, it is fallen back on soft attitude.
In second step, moulding with hydraulic press or punch press, uses the trigonocephalia mould that pipe fitting 2 is pressed into bend pipe base 19.Like Fig. 2,3, shown in 4, the trigonocephalia mould is made up of trigonocephalia patrix 1 and the counterdie 22 with pair of parallel roller 4.Have half slot on the trigonocephalic end face of trigonocephalia patrix 1, the footpath of the roller 4 of counterdie 22 upwards also has half slot accordingly, and the radius of semi-round groove equals the radius of pipe fitting outer wall; Trigonocephalia faces the centre of two rollers 4.
During moulding, with inserting profiling core rod 3 in the two ends of pipe fitting 2, profiling core rod 3 is shown in figure 10 earlier; Integral body is cylinder; Diameter is slightly less than the diameter of pipe fitting 2, a side of head 31 (insertion end) be provided with moulding after the curved surface that matches of pipe fitting bend, the radius of curved surface equals 1.1D; The end face of head 31 is a plane, and a side relative with curved surface on the end face is provided with chamfering.When inserting profiling core rod 3 end face of two profiling core rods 3 is offseted, the position that two profiling core rods 3 offset is positioned at the centre of pipe fitting 2, and curved surface one side of profiling core rod 3 is over against minor face one side of pipe fitting 2.
Then pipe fitting 2 is placed on two rollers 4, and makes the minor face of pipe fitting 2 grow the limit down up, face the centres of two rollers in the middle of the pipe fitting 2.The master cylinder of primer fluid press is descending, drives trigonocephalia patrix 1 triangle head the mid portion of pipe fitting 2 is depressed, drive simultaneously two rollers 4 towards the third side to rotation, so pipe fitting 2 is pressed into bend pipe base 19.Through the stroke that adjustment trigonocephalia patrix 1 descends, can control bend pipe base 19 needed angles.When two rollers 4 rotate in opposite directions; Profiling core rod 3 also and then outwards withdraws from, and when trigonocephalia patrix 1 dropped to bottommost, pipe fitting 2 was pressed into the bend pipe base 19 (as shown in Figure 5) of required angle; The core rod of profiling simultaneously 3 is extruded (see figure 3); Extract profiling core rod 3 at last, the master cylinder of primer fluid press is up, takes out bend pipe base 19.
The 3rd step, bulging, enlarging,
1, the preparatory stage, on the workbench of four-column hydraulic press, adorn earlier a bulging water tank, again enlarging mould 5 is packed in the bulging water tank 10, like Fig. 6, shown in 7.Enlarging mould 5; As shown in Figure 6, be put together by two steel forms, be provided with the die cavity 51 of finished product elbow-shaped in the enlarging mould 5; The interior turn of bilge 54 of die cavity 51 is identical with product with the radius of curvature R of bent out portion 53, has the accent 52 that communicates with die cavity 51 on the adjacent dual-side of enlarging mould 5.Have two cinclides that can supply bulging on the relative sidewall of the accent 52 of water tank 10 and enlarging mould 5, be fixed with sealing gasket 9 around the cinclides with the core rod turnover.Bulging is divided into bulging core rod 6 and the bloated pattern core 17 of water filling with core rod.Then bulging core rod 6 and the bloated pattern core 17 of water filling are inserted in the cinclides respectively, and the bloated pattern core 17 of water filling is connected with water filling device through connecting rod 7, be provided with through hole in bloated pattern core 17 of water filling and the connecting rod 7, the required water of interpolation bulgings in the at last past bulging water tank 10.
2, carry out the enlarging bulging stage, bend pipe base 19 is put into the die cavity 51 of enlarging mould 5, the master cylinder of primer fluid press is descending; Matched moulds and use the master cylinder pressurize, treat the interior pressure stability of die cavity 51 after, restart two side cylinders of hydraulic press; Promoting bulging core rod 6 simultaneously gets in the two ends mouth of pipe of bend pipe bases 19 with the bloated pattern core 17 of water filling; Start water filling device simultaneously through the water filling in bend pipe base 19 of water filling bulging core rod, the diameter of pattern core 17 is greater than the nozzle diameter at bend pipe base 19 two ends because bulging core rod 6 and water filling are expanded, and the mouth of pipe at bend pipe base 19 two ends is by support is big by force; Make the spaces that form sealing in the bloated pattern core 17 of bulging core rod 6 and the water filling bend pipe base 19 between the two simultaneously; The propelling that continues along with two bulging core rods sharply increases the pressure of the water in the bend pipe base 19, forces bend pipe base 19 depression positions to recline toward the inwall of die cavity 51, when the pipe internal pressure surpasses the maximum working pressure (MWP) of copper pipe; Sunk part bulging full circle under hydraulic pressure becomes full, and is final consistent with the inner wall shape of die cavity 51.Close water filling device this moment, withdraws from the bulging core rod from mould, and the master cylinder of primer fluid press is up, and semi-finished product elbow 20 (as shown in Figure 8) are taken out in die sinking.Whole process just can be accomplished in 8 seconds, and each step of whole operation can utilize the PLC program to realize automation on hydraulic press.The degree of depth that the bulging core rod pushes can be according to the requirement decision of product bellmouth.In order to reduce the friction between bend pipe base 19 and die cavity 51, the bulging core rod, the surface roughness of die cavity 51, bulging core rod 6 should be more than 0.8.
Water filling device is made up of check valve 11, high-pressure overflow valve 12, pipeline 13, magnetic valve 14, storage tank 15 and plunger displacement pump 21 like Fig. 6, shown in 7, and water filling device is connected with bulging core rod 6 through the interior connecting rod 7 that is provided with the hole.Connecting rod 7 is through pipeline 13, be connected with storage tank 15 through check valve 11, and pipeline 13 is a flexible pipe with the linkage section of connecting rod 7.The end that pipeline 13 is positioned at storage tank 15 is connected with magnetic valve 14, and pipeline 13 also is connected with high-pressure overflow valve 12, and the water that high-pressure overflow valve 12 overflows is back in the storage tank through return pipe; The pressure of high-pressure overflow valve 12 is set and should be set to about 5MPa usually greater than the tubing maximum working pressure (MWP).The delivery port of plunger displacement pump 21 is connected with the water inlet of magnetic valve 14.The operation principle of water filling device is: the water that magnetic valve 14 is opened in the storage tank 15 gets in the bend pipe base 19 through check valve 11, pipeline 13, connecting rod 7 and bulging core rod 6 successively; Check valve 11 stops water filling when the pressure in bend pipe base 19 chambeies surpasses the pressure of water filling, and when pressure that the pressure bend pipe base 19 in sets above high-pressure overflow valve 12, high-pressure overflow valve 12 is Overflow drainage just; When bulging core rod 6 entered the maximum turn of bilge of enlarging mould 5, high-pressure overflow valve 12 stopped draining, and the bellmouth size and the inside and outside R size of bend pipe base 19 have all reached standard-required at this moment.
Bulging core rod 6 is as shown in Figure 9 to be made up of conical head 61, contraction flow region 64, barred body 66 and joint portion 65, and conical head is pyramid type approximately, and its axis projection is circular; Conical head 61 is surrounded by the first surface 62 and second curved surface 63, and second curved surface 63 is a working face, when bulging, bend pipe base 19 is pushed; Second curved surface 63 match with the bent out portion 53 of die cavity 51 (as shown in Figure 7); Be contraction flow region 64 between conical head 61 and the barred body 66, contraction flow region 64 is used for bend pipe base 19 is carried out the forming processes of socket, is 45 ° chamfering; The diameter of barred body 66 is bellmouth size Φ 42.2, and joint portion 65 is threaded with connecting rod 7.Water filling expand the difference of pattern core 17 and bulging core rod 6 be core rod axially be drilled with through hole.
In the 4th step, scarfing cuts off semi-finished product elbow 20 two ends redundances with instrument lathe and to process the finished product elbow, makes the bellmouth length of finished product elbow satisfy the product standard requirement.
Find through inventor's repetition test and contrast, adopt traditional rubber bulging method, per 10000 product needed are used 20Kg left and right sides rubber, have so both increased the filler cost, and rubber powder also can affect to the environment of plant; Each class of rubber bulging operation can be produced 670 products, and there is residual rubber powder on the pipe fitting surface during bulging, needs through clean surface residual; As there being residual powder will cause the product surface depression in the die cavity, need through follow-up polishing, overall acceptability rate less than 95%.Yet through processing technology of the present invention, each class can be produced 2400 products, and the inside and outside R of product is full, do not have depression, and the overall acceptability rate reaches more than 98%; Not only practice thrift the use of filler, also made production process reduce by a step, improved production efficiency of products greatly.Thereby verified that this technology bulging operation is simple, production efficiency is high, product is attractive in appearance, product percent of pass is high, the advantage of manufacture process environmental protection.
Claims (10)
1. the processing technology of a metal bends is characterized in that may further comprise the steps:
The first step, blanking cuts into the pipe fitting of converted products elbow Len req with blanking machine with tubing, and two ends are cut into the shape of angular cut;
In second step, moulding is earlier with inserting the profiling core rod in the two ends of pipe fitting; Then pipe fitting is placed on two rollers of trigonocephalia lower mould; And the long up limit of the minor face that makes pipe fitting down, and the mid portion of pipe fitting faces the centre of two rollers, last matched moulds; Trigonocephalia patrix with the trigonocephalia mould is depressed the mid portion of pipe fitting, processes the bend pipe base;
The 3rd step, bulging, enlarging:
(1), the preparatory stage; Earlier the enlarging mould is packed in the bulging water tank, have two cinclides that can supply bulging with the core rod turnover on the sidewall of water tank, bulging comprises bulging core rod and water filling bulging core rod with core rod; Be fixed with sealing gasket around the cinclides; Then bulging core rod and water filling bulging core rod are inserted in the cinclides respectively, and water filling bulging core rod is connected with water filling device through connecting rod, last toward the interior required water of bulging that adds of bulging water tank;
(2), the execution phase, the bend pipe base is put into the die cavity of enlarging mould, matched moulds; After treating the pressure stability in the die cavity; Promote simultaneously to start water filling device simultaneously through the water filling in the bend pipe base of water filling bulging core rod in the two ends mouth of pipe of bulging core rod and water filling bulging core rod entering bend pipe base, continue to advance bulging core rod and water filling bulging core rod that the pressure of the water in the bend pipe base sharply is increased to above the tubing maximum working pressure (MWP); Close water filling device then; From the enlarging mould, withdraw from bulging and use core rod, the semi-finished product elbow is taken out in die sinking;
In the 4th step, scarfing cuts off semi-finished product elbow two ends redundance, makes the bellmouth length of finished product elbow satisfy standard-required.
2. the processing technology of a kind of metal bends according to claim 1; It is characterized in that: described trigonocephalia mould is made up of trigonocephalia patrix and the counterdie with pair of parallel roller; Have half slot on the trigonocephalic end face of trigonocephalia patrix; The footpath of the roller of counterdie upwards also has half slot accordingly, and the radius of half slot equals the radius of pipe fitting outer wall, and described trigonocephalia faces the centre of two rollers.
3. the processing technology of a kind of metal bends according to claim 1; It is characterized in that: described enlarging mould is put together by two steel forms; Be provided with the die cavity of finished product elbow-shaped in the enlarging mould; The interior turn of bilge of die cavity and the bending radius of bent out portion are identical with product, have the accent that communicates with die cavity on the adjacent dual-side of enlarging mould.
4. the processing technology of a kind of metal bends according to claim 1; It is characterized in that: described profiling core rod; Integral body is cylinder; One side of head be provided with moulding after the curved surface that matches of pipe fitting bend, the end face of head is the plane, a side relative with curved surface on the end face is provided with chamfering.
5. the processing technology of a kind of metal bends according to claim 1; It is characterized in that: described water filling device is made up of check valve, high-pressure overflow valve, pipeline, magnetic valve, storage tank and plunger displacement pump; Check valve is connected with connecting rod and storage tank respectively through pipeline, and the end that pipeline is positioned at storage tank is connected with magnetic valve, and pipeline also is connected with high-pressure overflow valve; High-pressure overflow valve is communicated with storage tank through return pipe, and the delivery port of plunger displacement pump is connected with the water inlet of magnetic valve.
6. according to the processing technology of each described a kind of metal bends among the claim 1-5; It is characterized in that: described bulging core rod is made up of conical head, contraction flow region, barred body and joint portion, and described conical head is pyramid type approximately, and the axis projection of conical head is circular; Conical head is surrounded by the first surface and second curved surface; Second curved surface is a working face, and second curved surface matches with the bent out portion of die cavity, and contraction flow region is between conical head and barred body; Contraction flow region is 45 ° a chamfering, and the joint portion is provided with screw thread.
7. according to the processing technology of each described a kind of metal bends among the claim 1-5; It is characterized in that: in described first step step; If the tubing that is adopted does not belong to soft attitude tubing, also to the said pipe fitting that be slit into the angular cut shape be made annealing in process, make said pipe fitting fall back on soft attitude.
8. the processing technology of a kind of metal bends according to claim 6; It is characterized in that: in described first step step; If the tubing that is adopted does not belong to soft attitude tubing, also to the said pipe fitting that be slit into the angular cut shape be made annealing in process, make said pipe fitting fall back on soft attitude.
9. according to the processing technology of each described a kind of metal bends among the claim 1-5, it is characterized in that: described die cavity and bulging with the surface roughness of core rod more than 0.8.
10. the processing technology of a kind of metal bends according to claim 8 is characterized in that: described die cavity and bulging with the surface roughness of core rod more than 0.8.
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| CN2010102783949A CN101972795B (en) | 2010-09-13 | 2010-09-13 | Machining process of metal elbow |
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| CN2010102783949A CN101972795B (en) | 2010-09-13 | 2010-09-13 | Machining process of metal elbow |
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| CN113441599B (en) * | 2020-03-25 | 2023-02-14 | 宝山钢铁股份有限公司 | Hydraulic forming and flaring combined process and device for tubular part |
| CN114103214B (en) * | 2021-11-22 | 2024-02-02 | 福建省骏旗机械工贸有限公司 | Two-way butt-impact extrusion device for blank and working method thereof |
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| JPS5935691B2 (en) * | 1982-06-30 | 1984-08-30 | ホンダエンジニアリング株式会社 | Square pipe bending method and device |
| JPS5929334B2 (en) * | 1982-10-19 | 1984-07-19 | 工業技術院長 | Hydraulic bulge forming method for bent pipes |
| JP2859548B2 (en) * | 1994-12-28 | 1999-02-17 | 日本鋼管株式会社 | Steel sheet forming method |
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2010
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| US3453857A (en) * | 1966-10-21 | 1969-07-08 | Pico Corp | Apparatus and method of bending pipe |
| DE4322711A1 (en) * | 1993-07-08 | 1995-01-19 | Rofo Rohrbogen Und Formstuecke | Method for the production of a tube bend, in particular a standard bend |
| US5927119A (en) * | 1996-04-10 | 1999-07-27 | Toyota Jidosha Kabushiki Kaisha | Bulge forming method and apparatus |
| CN1385259A (en) * | 2002-06-25 | 2002-12-18 | 丛华 | Mould core drawing out device for angle head cold-pushing formation machine |
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| JP平8-187514A 1996.07.23 |
| JP昭59-4919A 1984.01.11 |
| JP昭59-73132A 1984.04.25 |
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|---|---|
| CN101972795A (en) | 2011-02-16 |
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