CN1204726A - Common pall and method of manufacturing the same - Google Patents

Abstract

A common pipeline which can effectively limit the generation of stress in the inner peripheral part at the lower end of branch hole, thereby improves the inner pressure fatigue strength of the branch pipe connection part, in order to achieve reliable and steady capability by getting excellent durability and preventing the liquid leakage caused by generation of crack. A method for manufacturing the common pipeline is also provided, in this method, the pressure supplying process only need to be added to the existing manufacturing process without complex equipments, the common pipeline with high quality is manufactured with low cost without causing the problem that the equipments cost is increased and the productivity is reduced because of adding the process.

Description

Common line and manufacture method thereof

The present invention puts it briefly and relates to a kind of common line, as the high pressure fuel conduit on the oil conservator fuel injection system of diesel engine or pulley rail.

Usually, thick shape common line as shown in figure 11 for example, people have understood this common line, the structure of this common line makes: affluent hole 21-2 part is connected with delivered inside passage 21-1 on the circumferential wall portion that is arranged in main line 21 ends that are made of circular pipe, this affluent hole forms an outside open pressure bearing seat surface 21-3, and press seat surface 22-3 is by having taper shape and being constituted by the connection head 22-2 that twists and warps the tributary pipe 22 that increases its diameter, this press seat surface 22-3 contacts and engages with end generation by means of the connection metalwork 23 of the peripheral part of the main line 21 that surrounds contiguous this pressure bearing seat surface, utilize the engagement of the tightening nut 24 that is pre-installed in a tube end thus, when extruding connects the bottom of head 22-2 neck, fastening and be connected to by connecting on the threaded walls 23-1 part that metalwork 23 stretches out.In the drawings, label 22-1 represents the flow channel of tributary pipe 22, label 25 expression sleeve gaskets.

But, with regard to this connection metalwork class common line, its structure makes: this connection metalwork 23 is from being externally mounted on the main line 21, be connected nut that metalwork 23 is meshed 24 with this fastened and be connected, as shown in figure 11, because the acting in conjunction of 22 the extruding that is connected head 22-2 is managed in the axial force that acts on pressure bearing seat surface 21-3 and the internal pressure of main line 21 and this tributary, at the interior periphery part P generation very big stress of affluent hole 12-2 than low side, so that break from beginning than low side interior periphery part P to produce easily, thereby have the possibility that causes leakage.

The present invention is intended to solve above-mentioned traditional problem, an object of the present invention is to provide a kind of maximum tension stress value and common line that can improve internal pressure fatigue strength and manufacture method thereof that partly produces than the interior periphery of low side at affluent hole that reduce.

To achieve these goals, according to a first aspect of the invention, provide a kind of common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below that connects head, thereby fastening and connect this connection metalwork, residual stresses stress is present on the part of this affluent hole near the transfer passage open end of main line in this common line.

In addition, according to a second aspect of the invention, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below that connects head, thereby it is fastening and connect this connection metalwork, the best method by punching press in the method, along diametric(al) from the outside pressure is acted near on the main line of this affluent hole, produce residual stresses stress at this affluent hole near the part of the transfer passage open end of main line thus.And in this case,, go out this affluent hole along diametric(al) from the outside pressure being applied near in the main line of this affluent hole by outside pressing.

Also have, according to a third aspect of the invention we, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below of this connection head, thereby it is fastening and connect this connection metalwork, by inner pressing pressure is acted on the circumferential surface near the main line of this affluent hole in the method, thereby produce residual stresses stress near the part of the transfer passage open end of this main line at this affluent hole.

Have, according to a fourth aspect of the present invention, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below that connects head, thereby it is fastening and connect this connection metalwork, in the method by pressure is made pressure act on the circumferential surface near the main line of this affluent hole from the internal action of main line to the pipe expansion method on the diametric(al) of pipe, produce residual stresses stress at this affluent hole near the part of the transfer passage open end of main line thus.

In addition, according to a fifth aspect of the present invention, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below of this connection head, thereby it is fastening and connect this connection metalwork, after pressure is acted on the inner circumferential surface of this main line, go out affluent hole in the method.

In addition, according to a sixth aspect of the invention, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below of this connection head, thereby it is fastening and connect this connection metalwork, in the method by to the enlarged-diameter method on the diametric(al) of pipe pressure being acted on the inner peripheral surface of affluent hole from the internal action of affluent hole, thereby produce residual stresses stress near the part of the transfer passage open end of main line to pressure at affluent hole.

Also have, according to a seventh aspect of the present invention, propose a method of making common line, this common line comprises the affluent hole at least one axial peripheral wall that is arranged in main line, and this main line has one and is positioned at axis centre transfer passage partly; One is connected and outside open pressure bearing seat surface with the tributary pipe, this tributary pipe has a transfer passage that is connected with transfer passage on the circumferential surface of this affluent hole part, thus this pressure bearing seat surface with one by be arranged in this tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut be pre-installed in this tributary tube end and be connected metalwork and be meshing with each other so that push the neck below of this connection head, thereby it is fastening and connect this connection metalwork, in the method, the blocks that becomes spheroid or have a tapered front end is forced on the transfer passage open end of main line of this affluent hole, produces residual stresses stress at this affluent hole near the part of the open end of the transfer passage of this main line thus.

Correspondingly, according to the present invention, owing to keep residual stresses stress near the part of the transfer passage open end of main line at affluent hole, thereby offset tensile stress by residual stresses stress, this tensile stress produces at the interior periphery part P than low side of affluent hole by the internal pressure of axial force that acts on the pressure bearing seat surface and main line with by the extruding acting in conjunction of tributary pipe connector portion, thereby has reduced the maximum tension stress value that the interior periphery than low side at affluent hole partly produces.As the method that produces and keep residual stresses stress at affluent hole near the part of the open end of the transfer passage of main line, can adopt following method: (1) makes pressure affact method on this main line by impact style from the outside on the diametric(al), (2) method of exerting pressure in the transfer passage the inside of main line, (3) the pipe expansion method of on the pipe direction of expansion, exerting pressure from main line inside, (4) the enlarged-diameter method of on diametric(al), exerting pressure from affluent hole inside, and (5) are pressed onto balling-up body or blocks with tapered front end the method on the transfer passage open end of main line at the affluent hole place.

In this case, before or after affluent hole or the same time, use is used for producing the process for stamping of residual stresses stress on the part of the transfer passage open end of the close main line of affluent hole, before or after affluent hole, can use transfer passage internal pressure pipe expansion method, but, be preferably in after affluent hole and use, and after affluent hole, using affluent hole enlarged-diameter method.

According to the present invention, the method of exerting pressure from the main line outside by pressing as (1), for example, but the pipeline main body be installed in one have on the former of arc-shaped slot and mould by move left and right pushes and the situation of fixing under, can adopt the method for coming punching press by drift or lever.

In addition, the method as exert pressure in the transfer passage the inside of main line (2) preferably adopts the fluid pressure such as oil pressure or hydraulic pressure.

Then, be applied to the pipe expansion method of pipe on the diametric(al) as (3) from main line inside pressure, for example, can adopt the pressure welding connection or use the enlarged-diameter method of disappearance instrument, the mode of extracting of the pressing that this pressure welding connection promptly realizes than the big slightly enlarged-diameter device of the internal diameter of the transfer passage of main line such as spheroid or hull shape plug by means of a diameter.

In addition, be applied to method on the diametric(al) from affluent hole inside pressure, can adopt with diameter of pressure welding than the big slightly spheroid of the affluent hole internal diameter of going out by pressing or the method for stopper as (4).

Also have, balling-up body or blocks with tapered front end are pressed onto the method on the transfer passage open end of main line as (5) at the affluent hole place, along with adopting the balling-up body or having taper shape, the blocks of oval taper or long oval tapered front end, for example, can adopt a firm ball and firm ball receiving device or have the blocks of tapered front end and the method in the blocks receiving device insertion main line, arrange firm ball receiving device or blocks receiving device at affluent hole with the mode that the transfer passage open end generation of main line contacts with the sphere of firm ball or the preceding conical surface of blocks, insert one from the other end of main line and have the drift of nosed and compress, thereby the front end conical surface of the sphere of just ball or blocks is pressed onto on the transfer passage open end of this main line at this affluent hole place.

As mentioned above, according to the present invention, by keeping residual stresses stress near the part of the transfer passage open end of main line at affluent hole, make when high pressure fuel accumulates to transfer passage, can offset by residual stresses stress than the tensile stress that the interior periphery of low side partly produces at affluent hole, so that limit the size of tensile stress effectively, thereby improved the internal pressure fatigue strength that the tributary pipe jointing part divides.

Fig. 1 is a schematic representation of making first embodiment of common line method according to the present invention,

Fig. 2 A, 2B, 2C, 2D and 2E are illustrated in the pressure acting device that uses in the above-mentioned manufacture method, wherein, Fig. 2 A is to use a drift with inverted concave pressure surface to come the partial longitudinal section of the method for punching press, and Fig. 2 B is to use a drift that is furnished with annular boss peace pressure surface on the main line external peripheral surface to come the sectional arrangement drawing of the method for punching press.Fig. 2 C is to use one to have dished main line external peripheral surface and come the sectional arrangement drawing of the method for punching press with the drift that becomes the sphere pressure surface.Fig. 2 D is to use one to have with the outstanding main line external peripheral surface of pointed shape and come the sectional arrangement drawing of the method for punching press with the drift that becomes straight shape pressure surface, and Fig. 2 E is to use a drift with extension of the diameter that a bottom outlet identical with the interior affluent hole diameter of main line outer peripheral surface and energy match with this bottom outlet that forms on pressure surface to come the sectional arrangement drawing of the method for punching press.

Fig. 3 is the variant embodiment schematic representation of manufacture method as shown in Figure 1.

Fig. 4 is embodiment's a schematic representation of going out the method for an affluent hole according to the manufacture method of first embodiment of the invention when exerting pressure.

Fig. 5 is second embodiment's of a common line method constructed in accordance schematic representation.

Fig. 6 is the 3rd embodiment's of a common line method constructed in accordance schematic representation.

Fig. 7 is the 4th embodiment's of a common line method constructed in accordance schematic representation.

Fig. 8 A and 8B are the 5th embodiment's of common line method constructed in accordance schematic representation, wherein, Fig. 8 A is with the sectional arrangement drawing of a spheroid at the affluent hole of the method for the transfer passage open end of affluent hole place punching press main line, and Fig. 8 B is with the sectional arrangement drawing of the blocks of tapered front end at the affluent hole of the method for the transfer passage open end of affluent hole place punching press main line arranged.

Fig. 9 A, 9B, 9C and 9D are the 6th embodiment's of common line method constructed in accordance schematic representation, wherein, Fig. 9 A is the 6th embodiment's a sectional arrangement drawing, Fig. 9 B is the drawing in side sectional elevation along Fig. 9 A line b-b, Fig. 9 C is the drawing in side sectional elevation along Fig. 9 A line c-c, and Fig. 9 D is the drawing in side sectional elevation along Fig. 9 A line d-d.

Figure 10 is an embodiment's the sectional arrangement drawing of the tributary pipe connecting structure of the common line that produces with manufacturing method according to the invention.

Figure 11 is the sectional arrangement drawing of the tributary pipe connecting structure part of the traditional common line that the present invention relates to.

In Fig. 1 to 10, label 1 is represented main line, and label 2 is represented the tributary pipe, on behalf of ring-type or polygonal, label 3 connect metalwork, label 4 expression tightening nuts, label 5 expression sleeve gaskets, label 6 is represented drift, and label 7 is represented metal pattern, and label 8-1 and 8-2 represent the enlarged-diameter device, label 9 is represented mounting fixture, label 10 is represented tension device, and label 11 is represented punch assembly, and label 12 representatives are towards thick stick, the firm ball receiving device of label 13 representative, and label 13 ' represent blocks receiving device.

Main line 1 as a shared pipeline is the high-pressure delivery steel pipe of being made by the STS480 with thicker relatively tubular portion, for example, this tubular portion has the diameter of 28mm and the thickness of 9mm, and the inside of its axial centre part forms transfer passage 1-1.

In method shown in Figure 1, annular or polygonal connect metalwork 3 and have threaded walls 301 according to the present invention, and threaded walls 301 is meshed with tightening nut 4, and tightening nut 4 circumferential surface and tributary are managed 2 side and are installed together within it.In pulling down the process that annular with threaded walls 301 or polygonal connect metalwork 3, main line 1 fixes by metal pattern 7 in stamping process.This metal pattern 7 is made of a metal pattern that has with the spill cross section of the essentially identical arc shaped surface 7-1 of circumferential surface radius of curvature of main line 1, and as shown in the figure, and half circumference in the bottom of this main line 1 is fixed on this metal pattern 7 basically.Then, but the metal pattern 7-2 and the 7-3 of move left and right driven by actuator so that clamp to remove half circumference in top near the main line 1 from the part of its both sides formation affluent hole 1-2.This is necessary in order to reach the punching press effect fully.

When main line 1 is fixed to metal pattern 7, by being installed to punch assembly (not showing) and its diameter drift 6 littler than transfer passage 1-1 inside diameter, on the diametric(al) of the central axis of main line 1, pressure is affacted on the external peripheral surface of main line 1 towards inside diameter.With regard to the pressure of this moment, although it is not specifically limited, it should enough reach a degree, and it is outstanding slightly so that form planar section 1-8 promptly to be set directly at the inner circular side face of transfer passage 1-1 of this main line of drift 6 bottoms.Because the pressure effect of drift 6, and the inner circular side face of the transfer passage 1-1 of main line is given prominence to slightly so that is flattened, therefore when exerting pressure, produced plastic deformation part and resiliently deformable part, thereby and when removing pressure the difference because of amount of recovery produced distortion generation residual stresses stress.

After this, in the fine finishing process, in the stamping process of main line 1, produce and form affluent hole 1-2 on the part of being out of shape, be preferably on the central axis by drift 6 in such a way punching press so that produce circular and outside open circumferential surface, this affluent hole is connected with the transfer passage 1-1 of main line 1, and is connected with the pressure bearing seat surface 1-3 of transfer passage.After this, ring-type or polygonal are installed and are connected metalwork 3.

Fig. 2 for example understands the pressure applying means that keeps residual stresses stress by means of pressing on the open end near the transfer passage of the main line of affluent hole 1-2, and the front end (pressure surface) that Fig. 2 A is illustrated in drift 6 is gone up to form to have the recess 6a of triangular cross section and pressure is applied to method on the external peripheral surface of main line 1 by drift 6.With regard to this method, because than big pressure is on the core of the external peripheral surface that is applied to the main line that is surrounded by threaded walls 3-1, also be applied on the circumferential section, so residual stresses stress can be retained in effectively near in the relative relative broad range of affluent hole 1-2 that is arranged on this part.

In addition, Fig. 2 B represents the upper surface that on the outer peripheral surface by the main line 1 that surrounds at threaded walls 3-1 annular boss 1-4 is set and comes punching press annular boss 1-4 with the drift 6 with concora crush face, thereby, near the relative relative broad range of the affluent hole 1-2 that is provided with later on, keep the method for residual stresses stress in the mode identical with Fig. 2 A.

Fig. 2 C is illustrated in to have the concave portions 1-5 that is inverted triangular cross section and goes up the external peripheral surface that forms the main line 1 that threaded walls 3-1 surrounded, and comes the method for the bottom that punching press is made of concave portions 1-5 by the drift 6 with spherical pressure surface.In this method, because the inclined-plane of bottom is to be stamped for the first time, in this case, residual stresses stress is retained in effectively near near the affluent hole 1-2 that is provided with later on.

Fig. 2 D is illustrated in and is provided with one on the external peripheral surface of the main line 1 that threaded walls 3-1 surrounds and has pointed shape cross section boss 1-6, and comes the method for the bottom that punching press is made of boss 1-6 by the drift 6 with concora crush face.In this method, because the boss 1-6 with pointed shape cross section is for the first time by 6 punching presses of drift, huge pressure affacts the core of this bottom.Correspondingly, also be in this case, near the affluent hole 1-2 that is provided with after huge residual stresses stress is retained in a concentrated manner.

Fig. 2 E represents a kind of method, this method is provided with a hole in the heart in the external peripheral surface of the main line 1 that threaded walls 3-1 surrounds, it is identical with the diameter of the affluent hole 1-2 of setting later on that bottom, this hole 1-7 has certain depth and its diameter, and come punching press extension 6-1 by the drift 6 that is arranged on the stamping surface, the diameter of this extension 6-1 can put in this hole of band bottom 1-7 and its length longer slightly than the degree of depth in this hole bottom the band.With regard to this method, because having the circumferential section in this hole of bottom 1-7 is stamped when this hole is extended part 6-1 punching press, on the part of the affluent hole 1-2 that is provided with after pressure affacts in a concentrated manner, thereby residual stresses stress must be retained near the affluent hole 1-2.In this case, the shape of drift and the shape that forms on the outer peripheral surface of the main line relative with the front end of drift are not limited to the combination of shape shown in Fig. 2 A to 2E.

, not only can adopt said method but also can adopt method shown in Figure 3 with regard to exerting pressure by pressing and producing with regard to the method for residual stresses stress according to the present invention.

In Fig. 3, this structure that forms makes: the hole that a band bottom 1-2a is provided, this bottom 1-2a has certain depth and its diameter and is provided with later on and to have the diameter of affluent hole 1-2 of predetermined bore dia basic identical, and, come the inner bottom part 1-2b in this hole of punching press band bottom 1-2a along diametric(al) by having diameter in this hole that to put into band bottom 1-2a and its length drift 6 than this hole depth of band bottom.Owing to come punching press inner bottom part 1-2b by drift 6, thus this pressure affact in a concentrated manner after on the part of affluent hole 1-2 of setting, thereby residual stresses stress also must be retained near the affluent hole 1-2.

After this, by the boring procedure of drill bit, make the hole of band bottom 1-2a extend to transfer passage 1-1, thereby form affluent hole 1-2.Next, pressure bearing seat surface 1-3 also forming on the outwardly open periphery surface in circle.

In addition, shown in Figure 4ly for example understand a kind of method of going out affluent hole when in manufacture method, exerting pressure according to first embodiment, this method is for having the drift 6 of its length and extension 6-2 that its diameter with the diameter of front end affluent hole 1-2 identical longer than the thickness of main line 1 by use, come the external peripheral surface of punching press main line 1, thereby go out affluent hole 1-2.In this case, because this external peripheral surface of main line 1 is extended the punching press of part 6-2 institute, thereby this pressure affacts in punching press on the affluent hole 1-2 part in a concentrated manner, thereby residual stresses stress certainty produce near affluent hole 1-2.Metalwork shown in Figure 4 has polygon-shaped.

Have again, exert pressure and produce with regard to the method for residual stresses stress with regard to the pressing of using drift, pressure does not always affact the center of affluent hole, but can exert pressure on the formed position of this affluent hole and residual stresses stress is focused at least a portion of this affluent hole being offset slightly, promptly mainly focus on be positioned at the affluent hole that becomes the starting point of breaking than low side and the interior periphery part P on the axial direction of this main line, thereby produce and keep residual stresses stress.

Method representation such a case as shown in Figure 5, promptly the internal pressure method of exerting pressure in the transfer passage 1-1 of main line 1 is used as the method that produces residual stresses stress at affluent hole 1-2 near the open end of the transfer passage 1-1 of this main line.This method is equivalent under sealing main line 1 situation on one side, in this pipeline, pass through to carry as water or oils liquid fluid, at least 25% of main line 1 preferably the thickness of 50%-75% produce distortion from the inner circumferential surface side of main line 1 thickness, by applying the method for high pressure, thereby produce and keep the method for residual stresses stress near the open end of the transfer passage of this main line at affluent hole 1-2.

In this case, owing to kept pressure stresses reliably, thereby before applying internal pressure, preferably carrying out the processing of affluent hole 1-2, this is external near after the generation residual stresses stress on the transfer passage open end of this main line, and ring-type or polygonal connection metalwork 3 are installed.

Method representation such a case shown in Figure 6, i.e. the pipe expansion method conduct of exerting pressure along the pipe diametric(al) from the inside of main line 1 produces the method for residual stresses stress near the open end of the transfer passage 1-1 of this person in charge's passage at affluent hole 1-2.This method is equivalent to a kind of method that enlarges the transfer passage 1-1 of main line, by under situation about main line 1 flatly being fixed on the mounting fixture 9, come drawing to have enlarged-diameter device 8-1 such as spheroid, plug screw and the rolling element disappearance instrument of the diameter bigger slightly with tension device 10 than the inside diameter of transfer passage 1-1, so that it moves in transfer passage 1-1, and be in pressure contact, thereby produce near the open end of the transfer passage of this main line and keep residual stresses stress at affluent hole 1-2.

In this case, carry out going out affluent hole 1-2 before the enlarged-diameter operation on to the inner circumferential surface of main line 1, this is best, because pressure stresses is retained in reliably near on the open end of affluent hole 1-2.

Method representation shown in Figure 7 is in a fine finishing process, go out to have than the predetermined bore dia affluent hole 1-2 ' of minor diameter slightly in this main line upper punch, and by enlarging affluent hole 1-2 ' having the method for compressing into than the affluent hole 1-2 ' of minor diameter with the enlarged-diameter device 8-2 of the essentially identical diameter of inside diameter of the affluent hole 1-2 with predetermined bore dia such as spheroid or plug screw with punch assembly 11, thereby produce near the open end of the transfer passage of this main line and keep residual stresses stress at affluent hole 1-2, and with it as in the method for affluent hole 1-2 near the open end generation residual stresses stress of the transfer passage 1-1 of this main line.

Conduct shown in Fig. 8 A produces the example of residual stresses strain method on the transfer passage open end of this main line of affluent hole 1-2 with steel ball.In this method, steel ball 14 and shaft-like steel ball receiving device 13 insert in the main line 1, this steel ball receiving device 13 is arranged with the mode that the transfer passage open end generation of this main line contacts at affluent hole 1-2 with the sphere of steel ball 14, the drift of front end wedgewise inserts from the other end of this main line, thereby steel ball 14 is fixed on the oblique sliding surface of front end.In this case, when drift 12 punching presses, because the wedge shape effect of drift 12 make at the masterpiece on the affluent hole direction and use on the steel ball 14, so that steel ball 14 is pressed towards the open end of the transfer passage of main line at affluent hole 1-2 place.

Then, apply load up to reaching essential pressure, thereby steel ball 14 firmly is pressed onto on the open end of transfer passage of this main line, after this, steel ball 14, steel ball receiving device 13 and drift 12 are removed in main line 1 by punching press drift 12.With regard to this method, owing to by drift 12 punching press steel balls 14 pressure is affacted on the transfer passage open end of this main line at affluent hole 1-2 place, thereby can produce and keep residual stresses stress effectively near on the transfer passage open end of this main line at affluent hole 1-2.

Conduct shown in Fig. 8 B replaces steel ball 14 produces the method for residual stresses stress on the transfer passage open end of the main line of affluent hole 1-2 example by using front end blocks 15 coning.In this method, according to the same sequence of operation shown in Fig. 8 A, in blocks 15 and blocks receiving device 13 ' insertion main line 1, blocks receiving device 13 ' set-up mode make the conical surface of blocks 15 produce to contact at the transfer passage open end of affluent hole 1-2 place and main line, and insert the drift 12 of fore-end wedgewise from the other end of this main line, thereby blocks 15 is fixed on the oblique sliding surface of front end.In this case, when drift 12 punching presses, because the wedge shape effect of the fore-end of drift 12 is identical with above-mentioned steel ball situation, thereby the masterpiece along this affluent hole direction uses on the blocks 15, is pressed towards the open end of the transfer passage of this main line at affluent hole 1-2 place to cause blocks 15.Then, apply load up to reaching essential pressure by punching press drift 12, thereby blocks 15 firmly is pressed onto on the transfer passage open end of this main line, after this, blocks, blocks receiving device 13 ' and drift 12 in main line 1, remove.Thereby, according to this method, by drift 12 punching press blocks 15 pressure is affacted on the transfer passage open end of this main line at affluent hole 1-2 place, thereby on the open end of affluent hole 1-2, can produce and keep residual stresses stress effectively near the transfer passage of this main line in the identical mode of the situation of steel ball.

Preferably use blocks 15 with structure shown in Figure 9 ' replace blocks 15 shown in Fig. 8 B.Blocks 15 shown in Figure 9 ' constitute by front end 15 '-1 with circular cross section, punch-out 15 '-2 and main body 15 '-3 institute that combines with rectangular cross section with oval cross section.Front end 15 '-1 with circular cross section has basically the circular cross sectional shape that is complementary with affluent hole 1-2 inside diameter being used for importing affluent hole 1-2, so as to place exactly blocks 15 '.In addition, punch-out 15 '-2 with oval cross section have the non-circular cross-section shape that vertically goes up generation one long straight line that makes transfer passage 1-1, so that the both sides of concentrated area punching press affluent hole 1-2, so that between the transfer passage open end of the main line of this affluent hole 1-2, produce huge tensile stress easily than the main line 1 of low side interior periphery part.Have, main body 15 '-3 with rectangular cross section have rectangular cross section shape again, thereby so that by be mounted to be arranged in blocks receiving device 13 ' rectangular hole 13 '-1 of fore-end guarantee blocks 15 ' directivity.

According to method shown in Figure 9, near producing effectively on the transfer passage open end of this main line and to keep the sequence of operation of residual stresses stress identical with method shown in Figure 9.

Here, under the impact style by pressing, internal pressure method, pipe enlargement method is applied to pressure situation on the main line 1, spheroid or blocks with tapered front end as at affluent hole near the device that produces residual stresses stress on the transfer passage open end of this main line, embodiment shown in each situation is that ring-type or polygonal connect the situation that metalwork 3 is removed, yet there is no need to illustrate under the situation of loading onto ring-type or polygonal connection metalwork 3 how to carry out pressure is applied on the main line 1.

On the contrary, when this tributary pipe 2 is made of a tributary pipe or a tributary metalwork, as shown in figure 10, has the flow channel 2-1 that is communicated with the transfer passage of main line 1, and be furnished with in its end by connecting the press seat surface 2-3 that head 2-2 constitutes, connect head 2-2 and be bent and deformed the front end that forms and have taper, and make its linkage structure in the mode identical with conventional method.Correspondingly, the press seat surface 2-3 that is constituted by the connection head 2-2 that makes adjacent tributary pipe 2 contacts with the pressure bearing seat surface 1-3 generation of adjacent main line 1, and the tightening nut 4 that is pre-installed on this tributary pipe by sleeve gasket 5 is meshed with the threaded walls 3-1 that ring-type or polygonal are connected metalwork 3, thereby make tributary pipe 2 fastened and be attached thereto together under the effect that is in the tightening nut 4 below the neck that connects head 2-2.

As mentioned above, according to the present invention, pressure is applied on the part near the center portion of the mounting portion of the threaded walls 3-1 of the connection metalwork 3 of main line 1, is communicated with the transfer passage 1-1 of main line 1 and affluent hole 1-2 with pressure bearing seat surface 1-3 in corresponding part formation.Preferably with forming straight portion 1-8, apply process generation and reservation residual stresses stress on the close transfer passage open end of this main line of tributary pipe 1-2 by carrying out pressure, owing to affact the axial force on the pressure bearing seat surface 1-3, make affluent hole 1-2 produce tensile stress than low side interior periphery part P, this tensile stress is managed 2 the common negative function of the punching press that is connected head 2-2 by the internal pressure of residual stresses stress and main line 1 with the tributary and has been reduced widely.In addition, owing to exert pressure by punching press, so the transfer passage 1-1 circumferential surface of the main line of close affluent hole 1-2 is outstanding slightly and be flattened so that form straight portion 1-8, thereby the tensile stress that produces on affluent hole 1-2 part can be offset so that be reduced by residual stresses stress.Therefore, because this residual stresses stress and this smooth effect, the resulting common line of the method according to this invention can further reduce the pressure than low side interior periphery part P generation at affluent hole 1-2.

As mentioned above, since common line according to the present invention by residual stresses stress can offset affluent hole than the tensile stress that produces on the low side interior periphery part, so that limited this tensile stress effectively, thereby can improve the internal pressure fatigue strength that the tributary pipe jointing part divides, this common line has fabulous effect, promptly reaches reliable and stable performance by having fabulous durability and preventing owing to crack the escape of liquid that causes.In addition, the method of common line constructed in accordance, owing to only need add conventional manufacture process and need not complex apparatus by the process that punching press is exerted pressure, therefore do not exist because of increasing the problem that this process increases cost of equipment and reduces productivity, provide the high quality common line such excellent effect by low expense so that can realize.

Claims (16)

1. common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of this main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby fastening and connect described connection metalwork, it is characterized in that residual stresses stress is present on the part of described affluent hole near the open end of the transfer passage of this main line.

2. method of making common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of described main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby it is fastening and connect described connection metalwork, it is characterized in that pressure by outside pressing along diametric(al) from external action near on the main line of described affluent hole, thereby produce residual stresses stress at described affluent hole near the part of the open end of the transfer passage of described main line.

3. the method for a manufacturing common line as claimed in claim 2 is characterized in that pressure being applied near on the main line of described affluent hole along diametric(al) from the outside by outside pressing, after this goes out described affluent hole.

4. the method for a manufacturing common line as claimed in claim 2 is characterized in that going out described affluent hole to pressure when being applied on the close main line of described affluent hole by outside pressing along diametric(al) from the outside.

5. the method for a manufacturing common line as claimed in claim 2 is characterized in that going out earlier described affluent hole, pressure is applied near on the main line of described affluent hole along diametric(al) from the outside by outside pressing then.

6. method of making common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of described main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby it is fastening and connect described connection metalwork, it is characterized in that pressure being applied on the circumferential surface near the main line of described affluent hole, thereby produce residual stresses stress near the part of the open end of the transfer passage of main line at described affluent hole by inner pressing.

7. the method for a manufacturing common line as claimed in claim 6 is characterized in that applying described internal pressure by oil pressure pressure or fluid pressure.

8. the method for a manufacturing common line as claimed in claim 7 is characterized in that going out described affluent hole after described pressure is applied on the circumferential surface of described main line.

9. method of making common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of described main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby it is fastening and connect described connection metalwork, it is characterized in that pressure being applied on the circumferential surface near the main line of described affluent hole, thereby produce residual stresses stress near the part of the open end of the transfer passage of described main line at described affluent hole by the pipe enlargement method that pressure is applied on the pipe diametric(al) from the inside of described main line.

10. the method for a manufacturing common line as claimed in claim 9 is gone out described affluent hole after it is characterized in that on the circumferential surface that pressure is applied to described main line.

11. the method for a manufacturing common line as claimed in claim 9 is characterized in that by punching press or extracts than the big slightly enlarged-diameter of inside diameter of the transfer passage of described main line and partly finish described pipe expansion method.

12. the method for a manufacturing common line as claimed in claim 11 is characterized in that described enlarged-diameter part is made of a spheroid or a hull shape stopper.

13. a method of making common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of described main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby it is fastening and connect described connection metalwork, it is characterized in that by the enlarged-diameter method that pressure is applied on the pipe diametric(al) being applied to pressure on the circumferential surface of described affluent hole, thereby produce residual stresses stress near the part of the open end of the transfer passage of described main line at described affluent hole from the inside of described affluent hole.

14. the method for a manufacturing common line as claimed in claim 13 is characterized in that carrying out aforementioned tube expansion method by the inside diameter of the described affluent hole of ram ratio big slightly spheroid or stopper.

15. a method of making common line, this common line comprises: at least one is arranged in the affluent hole on the axial peripheral wall of main line, and this main line has a delivered inside passage that is positioned on its axis centre direction; One is connected and outside open pressure bearing seat surface with a tributary pipe, this tributary pipe has a transfer passage that is connected with described transfer passage on the circumferential surface of the described affluent hole part, thus this pressure bearing seat surface with one by be arranged in described tributary tube end be connected that wedge surface portion that head constitutes contacts and in this joint; Be connected metalwork and a nut with one, this connection metalwork surrounds the outer peripheral portion of described main line, this nut is pre-installed in described tributary tube end and is meshing with each other so that push the neck below of described connection head with the described metalwork that is connected, thereby it is fastening and connect described connection metalwork, it is characterized in that the blocks that becomes sphere-like or have a tapered front end is pressed onto on the open end of transfer passage of main line of described affluent hole, thereby produce residual stresses stress near the part of the open end of the transfer passage of main line at described affluent hole.

16. the method for a manufacturing common line as claimed in claim 15, it is characterized in that described blocks is circular and have the front end of the diameter that equates substantially with the inside diameter of described affluent hole, the punch-out of cross section ovalisation and the main part branch of cross section rectangularity and constitute by cross section, and the expanded hole that is used for installing described main body is arranged in a pair of part that is used for the described blocks of punching press one.

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