CN101829716A

CN101829716A - Method for pressing nuclear power main pipeline

Info

Publication number: CN101829716A
Application number: CN 201010161456
Authority: CN
Inventors: 谢坤
Original assignee: HAOYU PETROCHEMICAL POWER EQUIPMENT Manufacturing Co Ltd JILIN PROV
Current assignee: Jilin Zhongyi Nuclear Pipeline Manufacturing Co., Ltd.
Priority date: 2010-05-04
Filing date: 2010-05-04
Publication date: 2010-09-15
Anticipated expiration: 2030-05-04
Also published as: CN101829716B

Abstract

The invention relates to a method for pressing a nuclear power main pipeline, which is completed by a press machine, and comprises the steps of: first, preparing forging stock, wherein the diameter of the size bending part of pipeline forging stock is larger than that of the bended forging stock; carrying out bending for three times, wherein different upper moulds are needed at every time, and the axial length of the mould is gradually reduced according to the contact area between the mould and a workpiece; maintaining a lower mould tool not to be changed, wherein a lower mould comprises a lower die holder and a rotating body, and the rotating body can rotate around an axle hole on the lower die holder; and finally, pressing and shaping the bended product forging stock by an upper and a lower standardized moulds, wherein if the bended product forging stock is not shaped in place for once, pressing can be repeatedly carried out. The invention effectively reduces the production processing cost of a nuclear pipe fitting.

Description

Method for pressing nuclear power main pipeline

Technical field:

The present invention relates to a kind of processing method of main nuclear power pipeline, relate in particular to the drawing method of main nuclear power pipeline bent tube section.

Background technology:

At present the nuclear power projects that starts of China mostly is the second generation and the second generation half nuclear power technology greatly, and what the processing method of trunk line adopted in two generations and two generation half nuclear power technologies all is centre spinning method manufacturing.Along with third generation nuclear power technology has begun to popularize in an all-round way at home, the introduction of China's third generation nuclear power technology, requiring the trunk line product is to make after the solid forging.The main nuclear power pipeline product is divided into hot arc, cold section, and products characteristics is that caliber is bigger.The manufacture method that present product processing method has pure forging to process, because this examines pipe fitting diameter big (being φ 965mm), existing forging processing is made it solid, removes hollow space afterwards again in finished parts, cost is high.The bending method of third generation nuclear power technology trunk line does not have disclosure at present.

Technology contents:

The object of the present invention is to provide a kind of drawing method of main nuclear power pipeline bent tube section.。

The present invention utilizes forcing press to finish as follows:

Forging stock is prepared, and the diameter of the diameter of selecting pipeline forging stock size sweep for use after greater than bending to guarantee to bend and metal compensation demand during shaping;

Press-bending for the first time, the mold mid portion of selecting for use is a straight section, and both sides are arc transition, and bed die comprises die shoe and flip body two parts, and flip body can rotate around the axis hole on the die shoe, and the end back elbow angle of bending for the first time is 25 °--30 °;

Bend for the second time, select bed die identical when suppressing for the first time when suppressing for the second time for use, the mold straight section reduces, and the circular arc of both sides transition strengthens, and the end back elbow angle of bending for the second time is 40 °--and 45 °;

Bend for the third time, bed die identical when suppressing is for the first time selected in compacting for the third time for use, and the mold size especially bending radius of circular arc is consistent with the inner arc bending radius of approved product, and the back elbow of press-bending end for the third time angle is consistent with approved product;

Shaping with the shaper compacting shaping up and down of the product forging stock utilization after bending, if once do not have shaping to put in place, can repeat compacting.

What the present invention adopted is the machining manufacture of shaping after utilizing the forging pipe to bend, and not only can utilize common equipment and simple process can reach this purpose, the most important thing is greatly to reduce the production and processing cost of nuclear pipe fitting.

Description of drawings:

Fig. 1 is processing back finished product schematic diagram;

Fig. 2 is a pipeline forging stock schematic diagram;

Fig. 3 is the processing schematic diagram that bends for the first time;

Fig. 4 is the processing schematic diagram that bends for the second time;

Fig. 5 is the processing schematic diagram that bends for the third time;

Fig. 6 is shaping processing processing schematic diagram;

Wherein 1 is that mold, 2 is that die shoe, 3 is that flip body, 4 is pipe fitting to be processed.

The specific embodiment:

Hot arc with trunk line is the specific embodiment of example explanation invention below.Product after bending as shown in Figure 1, product radius of curvature R=1.5D, respectively there is an arm sweep both sides, an arm in the plane of being responsible for, another arm be responsible for the plane 45 ° of angles arranged.

Bending die divides upper die and lower die in the specific embodiment of the present invention.Patrix is divided into one, two by its different press-bending angle, three totally three molds.Wherein patrix one, two adopts casting Combination Welding structure, and patrix three adopts cast structure.Radius of curvature different and that differ greatly has been adopted on the interior semicircular ring surface of patrix one and workpiece contact, and patrix one, two has adopted respectively and exceeded the high spacing straight flange of semicircle 40, and patrix three has then adopted in 56.4 ° of scopes and exceeded the high spacing straight flange of semicircle 50.Counterdie comprises die shoe and flip body two parts.Flip body can rotate around the axis hole on the die shoe.The leading screw positioner is housed on the die shoe.Flip body adopts horizontal asymmetric structure, and in it in semicircular ring surface, it is 1.5 ° cone structure that a part has adopted gradient, to be complementary with the workpiece blank structure.

The press-bending process utilize forcing press be divided into three the step carry out.At first, patrix one is fixed on the slide block of forcing press, counterdie is placed on the workbench of forcing press, and makes the two entirely on the center.At this moment because flip body has asymmetric structure and can freely rotating by the axis hole on die shoe, so, need with the leading screw positioner with the flip body adjustment at two ends and be fixed on horizontal level.Workpiece after the heating is positioned on the bed die, adjusts the orientation of workpiece.The starting pressure machine is suppressed, and needs vertically the play location of workpiece back and forth in pressing process, to guarantee that the inner arc surface between two arms fully contacts on patrix and the workpiece, when the central angle of workpiece crooked position is in 25 °～30 °, stops to suppress.At this moment, need with the leading screw positioner flip body at two ends to be fixed, so far, patrix one compacting finishes.Patrix one is replaced by patrix two, the workpiece crooked position is highly carried out side direction in accordance with regulations flatten, and then heating, repeat said process, when central angle is in 40 °～45 °, stop compacting.Fix flip body.So far, patrix two compactings finish.Patrix two is replaced by patrix three, and then flattens, heating, compacting, during mould three compactings in the use, workpiece play vertically at this moment, when central angle was in 56.4 °, the lower limb of counterdie flip body contacted with locating piece, whole press-bending process end.

It is to want to allow bending from both sides that above press-bending process is selected three cover mold general purposes for use, and bending is progressively shifted to the centre then, and the benefit of doing like this is to avoid pressing process bend pipe inner arc especially the fold phenomenon to occur at the root of arm.Bend process bed die employing rotational structure, can avoid the straight section part crooked, and helping the slip of straight-tube portion in the BENDING PROCESS.

Shaping as shown in Figure 6 because above press-bending process is hollow press, oval phenomenon appears in bend branch, so the shaper compacting shaping up and down of the product forging stock utilization after will bending if once do not have shaping to put in place, can repeat to suppress.Shaping mould divides turn of bilge shaping and straight section shaping two covers.What the turn of bilge shaping mould adopted is to contain to build two arms and the project organization mutually nested with the straight section shaping mould.Back inner chamber loss of weight, mould upper edge two arm directions have the extension of certain-length, and purpose is used to proofread and correct the 45 ° of angles in space between two arms.On, adopt bearing pin and sleeve location between the bed die.What the straight section shaping mould adopted is only to contain to build one of them arm and the project organization mutually nested with the turn of bilge shaping mould.The same back inner chamber loss of weight that adopts, the mode that positions with the gulde edge mouth.Design gaps between shaping mould and the finished parts is 15mm.The shaping process is carried out in two steps.At first carry out the turn of bilge shaping.Earlier turn of bilge shaping patrix is fixed on the slide block of forcing press, turn of bilge shaping counterdie is placed on the workbench of forcing press, utilize bearing pin and sleeve positioner to go up, the counterdie levelling, centering fixes counterdie then.Workpiece after the heating is positioned on the bed die, adjusts the orientation of workpiece, the starting pressure machine is suppressed.If once do not have shaping to put in place, can heat once more, repeat compacting, till up to specification.Carry out the straight section shaping then.Adjust (utilizing the gulde edge mouth) equally, earlier and fix in the straight section shaping bed die.The straight section shaping mould has crooked alignment simultaneously and ovality is proofreaied and correct two kinds of effects.If there is buckling phenomenon in the workpiece straight section of pressing, after heating finished to workpiece, with the tap direction on the arm direction aligning mold on the workpiece, the starting pressure machine was suppressed then.The other end is carried out too.If only there is ellipticity error in the workpiece straight section of pressing, after then heating finishes to workpiece, only need workpiece water placing flat (being that bending direction is in horizontal plane) on bed die, can carry out the school circle by the starting pressure machine.

Above press-bending and shaping process, employing is colded pressing and hot pressing can be finished.

Claims

1. method for pressing nuclear power main pipeline is characterized in that utilizing forcing press to finish as follows:

Forging stock is prepared, and the diameter of the diameter of selecting pipeline forging stock size sweep for use after greater than bending is to guarantee to bend and metal compensation demand during shaping;