CN102430893A - Method for manufacturing small-inner-diameter hollow main shaft - Google Patents
Method for manufacturing small-inner-diameter hollow main shaft Download PDFInfo
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- CN102430893A CN102430893A CN2011102731173A CN201110273117A CN102430893A CN 102430893 A CN102430893 A CN 102430893A CN 2011102731173 A CN2011102731173 A CN 2011102731173A CN 201110273117 A CN201110273117 A CN 201110273117A CN 102430893 A CN102430893 A CN 102430893A
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Abstract
The invention provides a method for manufacturing a small-inner-diameter hollow main shaft, which comprises the steps of firstly dividing the small-inner-diameter main shaft into a plurality of shaft sections, respectively forging the shaft sections in a segmented manner, welding the shaft sections into a whole, then performing stress relief annealing on the small-inner-diameter main shaft, and performing finish machining on the outer circle and the inner circle of the small-inner-diameter main shaft to obtain a finished product; the inner side of the welding joint of the adjacent shaft sections is provided with an assembling spigot, and the outer side of the welding joint is provided with a welding seam groove; the welding is divided into two steps: argon arc welding is firstly adopted for bottoming and root welding, and then submerged arc welding is adopted for filling meat and cover surfaces. The invention realizes the sectional processing of the small-inner-diameter hollow main shaft of the hydroelectric generating set, thereby greatly reducing the manufacturing cost, shortening the manufacturing production period of the small-inner-diameter main shaft, ensuring the welding quality of the small-inner-diameter main shaft and relieving the manufacturing bottleneck of the small-inner-diameter main shaft.
Description
Technical field
The present invention relates to the field of machining of main shaft casting, specifically is the manufacturing approach of the little internal diameter hollow spindle of hydroelectric generation units such as a kind of tubular-turbine generator group or tidal power generation unit.
Background technology
The main shaft of tubular-turbine generator group or tidal power generation unit generally adopts little internal diameter hollow spindle owing to its structure, requirement of strength.This little internal diameter main shaft need carry the weight of water wheels rotating part and the axial thrust of water flow inside, and simultaneously, little internal diameter main shaft two ends connect the hydraulic turbine and generator respectively, the critical component of related whole unit, and transmit runner and rotate the moment of torsion that produces.As shown in Figure 1, the primary structure characteristics of such little internal diameter main shaft are: 1, internal diameter is little: Ф < 600mm; 2, wall thickness is big: δ>300mm.Because these parts are rotatable parts, and its mechanical performance, fatigue strength are had relatively high expectations, therefore, the intensity of the processing and manufacturing of this little internal diameter main shaft, quality are particularly important, directly influence the smooth operation of whole generating unit.
Because the size of this little internal diameter main shaft is big, structure is special, as shown in Figure 1, is example with certain through-flow unit, little internal diameter main axis length 9924mm, internal diameter 600mm, external diameter 1250mm, flange outer diameter 2500mm, 119 tons of gross weights.Its requirement of strength and crudy are had relatively high expectations, and the scheme that prior art can only adopt bearing to forge is made it.Under the situation that satisfies forging quality and production cycle, this scheme is comparatively ripe fabrication scheme.But because the size of this little internal diameter main shaft is bigger, the manufacturing cost that bearing forges is high; And the manufacturing cycle is longer, and the cycle of the general supply of material is about 1 year, simultaneously; Require very high to producer's manufacturing capacity; Under the prerequisite that guarantees forging quality, the company that can accept such little internal diameter main shaft forging in the world wide has only the few, can't satisfy the hydraulic generator unit manufacturing cycle at all.
Therefore, be devoted to work out in the water power industry and a kind ofly can this little internal diameter hollow spindle be carried out segmentation casting, again the manufacturing approach of welding assembling.Assembling the method for connection in the water power industry for shaft-like workpiece, generally is to adopt narrow-clearance submerged arc welding segmentation main shaft solder technology.But; When it is applied to the welding of this type of little internal diameter main shaft; There is following insurmountable so far difficulty: 1, because the internal diameter < 600mm of this little internal diameter main shaft; The welding operation personnel can't get into the inside of this little internal diameter main shaft, and the interface of little internal diameter main shaft is carried out the assembling of segmentation main shaft, fixing and welding back chipping; Nondestructive testing personnel also is difficult to carry out the process and final detection of the root of weld.2, submerged-arc welding technology is only applicable to the downhand position, requires to carry out segmentation spindle mounted, welding at horizontal level.And such little internal diameter main shaft axle body is long; Can't accurately locate during the horizontal level assembling, effectively fixing, when groove assembles, form easily and grind one's teeth; Be prone to produce weld defects such as incomplete fusion during welding, also can influence axiality and faces parallel after little internal diameter main shaft welding is accomplished simultaneously.3, Lincoln weld can cause the solder flux landing too greatly because of solder side circular arc degree when the less axis products of welding internal diameter.Welding process can't form effective protection, has a strong impact on welding quality.4, wall thickness δ>300mm, belong to ultra thick cross section welding, form weldering and connect Rong pond and operating personnel's hypertelorism, operating personnel significantly reduce the monitoring capacity of welding process.
Therefore, the narrow-clearance submerged arc welding segmentation main shaft solder technology that generally adopts of water power industry can't smooth implementation in the manufacturing of such main shaft.
Summary of the invention
The objective of the invention is to: provide a kind of can setting down, the manufacturing approach of the little internal diameter hollow spindle of the hydraulic generator unit of welding fabrication.
The technical scheme that the present invention adopted is:
A kind of manufacturing approach of little internal diameter hollow spindle; Said processing method is divided into little internal diameter main shaft the plurality of sections shaft part, carries out setting down respectively earlier; After being welded into integral body, again with little internal diameter main shaft stress relief annealing, to its cylindrical and in the circle fine finishining, obtain finished product; The welding point inboard of said adjacent shaft part is that assembling seam, the outside are weld grooves; Said welding is divided into two steps: adopt argon arc welding to feel secure and root weld earlier, adopt submerged-arc welding to fill out meat, capping again.
Vertical dress weldering is adopted in said argon arc welding, is about to shaft part vertically setting vertically, lap fit installation, and rotates around its axis, and the argon-arc welding gun head is horizontally disposed with, the welding point of corresponding shaft part junction.
Said vertical dress adopts assembly tooling that shaft part is cooperated and installs when welding; This assembly tooling comprises base and cylinder; Base is a disc, is arranged on the horizontal positioner that cylinder vertically is arranged on the upper surface of disk, the inwall of the outer peripheral face corresponding matching shaft part of cylinder.
Horizontal dress weldering is adopted in said submerged-arc welding, and soon the shaft part after bottoming and the root weld is horizontally disposed with vertically and rotates around its axis, and submerged arc welding gun head erect is provided with, the welding point of corresponding shaft part junction.
Said argon arc welding is the heated filament tungsten argon arc horizontal position welding of narrow gap.
Said submerged-arc welding is the Lincoln weld of narrow gap.
Said weld groove comprises argon arc welding groove and submerged-arc welding groove, is connected to become a step-like curved surface through two R rounding ofves between the two.
The segmentation position of said shaft part is arranged on the low stress area of little internal diameter main shaft.
The beneficial effect that the present invention produced is:
Simultaneously, the manufacturing approach of little internal diameter hollow spindle of the present invention has following characteristics:
1, the welding procedure of innovation:
Select narrow gap heated filament automatic tungsten anode argon arc welding connection technology on the horizontal position, to feel secure and root weld, the argon arc burning of narrow gap heated filament automatic tungsten anode argon arc welding is highly stable, obtains higher weldquality easily, can guarantee the root quality effectively; Use argon shield can well guarantee appearance of weld and quality; Further reduce the heat input through independent heating welding wire, can reduce distortion effectively and improve weldquality; This is most important to the root quality that guarantees the welding of segmentation axle.
Use ripe narrow gap Lincoln weld to fill out meat, capping after accomplishing, enhance productivity;
2, the bevel for welding of appropriate design: through calculating comprehensive bearing strength of weld seam and welding contracted quantity etc., clear and definite each section of bevel for welding degree of depth and width;
3, equitable subsection, the common ultrasound examination of combination and diffraction time difference method ultrasonic detection technology carry out weld seam detection, guarantee weldquality;
4, adopt vertical assembling special tooling, guarantee that assembling and positioning accurately reaches assurance assembling process safety, solve little internal diameter main shaft dress postwelding axiality and differ too big problem.
The invention enables the segmentation manufacturing of the little internal diameter hollow spindle of hydroelectric generation unit to become a reality; Reduce manufacturing cost so greatly; Shorten little internal diameter main shaft and make the production cycle, guarantee little internal diameter main shaft welding quality simultaneously, alleviate little internal diameter hollow spindle and make bottleneck.
Description of drawings
Fig. 1 is the structural representation of the little internal diameter main shaft that the present invention relates to;
Fig. 2 is the structural representation of argon arc welding equipment of the present invention, frock;
Fig. 3 is the schematic flow sheet of the vertical assembling of segmentation main shaft of the present invention;
Fig. 4 is the structural representation of submerged-arc welding welding segmentation main shaft of the present invention;
Fig. 5 is the structural representation of welding point of the present invention;
Fig. 6 is the structural representation of single welding welding point of the present invention;
Fig. 7 is the structural representation of single face welding and double face shaping of the present invention;
Fig. 8 is the structural representation of certain through-flow machine segmentation main shaft.
Label is represented among the figure: 1-welding gun support, 2-lever arm, 3-argon arc welding welding gun, 4-assembly tooling, the horizontal positioner of 5-, 6-submerged-arc welding welding gun, 7-welding point, the little internal diameter main shaft of 8-, 9-turning rolls, 10-shaft part, 11-lacing wire, 12-weld seam, 13-sealing run, the little internal diameter main shaft of a-inwall, b-seam, c-argon arc welding groove, d-changeover portion, e-submerged-arc welding groove.
The specific embodiment
Like Fig. 2～shown in Figure 8, the present invention is a kind of manufacturing approach of little internal diameter hollow spindle 8.The little Ф of internal diameter of the little internal diameter main shaft 8 of the hydroelectric generation unit that the present invention relates to < 600mm, the big δ of wall thickness>300m adopts prior art to be difficult to segmental machining.This method is divided into little internal diameter main shaft 8 plurality of sections shaft part 10, carries out setting down respectively earlier, and the arranged outside in the junction of adjacent shaft part 10 has welding point 7, after the corresponding assembling, is welded to connect again, makes it become a bearing.Innovative point of the present invention is: rely on advanced welding equipment; Adopt vertical dress weldering; Through adopting argon arc welding to feel secure and the assembled welding process of meat, capping is filled out in root weld+submerged-arc welding; With groove design, Technology for Heating Processing, processing technology, the defects detecting technology of rational segmentation scheme, uniqueness, the collaborative manufacturing processing of accomplishing little internal diameter main shaft 8.
In general, whole little internal diameter main shaft 8 is divided into 2 sections shaft parts 10 at least and forges, and detect a flaw qualified after, carry out erection welding again.Number of fragments forges cost according to each section and the production cycle is confirmed, divides 3～4 sections and is advisable.Suffered combined stress is calculated when moving according to little internal diameter main shaft 8, and the segmentation position should be avoided stress and concentrate position, the low stress area of operated by rotary motion on little internal diameter main shaft 8.Simultaneously, confirm vertical assembling after, the position of weld seam 12 should be in the limit lifting height of crosshead.
As shown in Figure 2; Narrow gap heated filament automatic tungsten anode argon arc welding is adopted in argon arc welding; And adopt the weldering of vertical dress during this argon arc welding, be about to that shaft part 10 vertically is provided with vertically, after lap fit installs, with argon arc welding welding gun 3 be horizontally disposed with, the welding point 7 of corresponding shaft part 10 junctions.
The full-length of the argon arc welding welding gun 3 in narrow gap is general≤350mm, and the present invention need increase length to 500mm, and the increase of length has brought the decline of the coupling stiffness of argon arc welding welding gun 3, makes that the rifle head jitter amplitude of argon arc welding welding gun 3 is bigger in the welding process.Simultaneously, the wall thickness δ of this little internal diameter main shaft 8>300mm, belong to ultra thick cross section welding, the degree of depth of its weld seam 12 is darker, makes the protective gas turbulent flow phenomenon of argon tungsten-arc welding aggravate, and is insufficient to the welding process protection.
Therefore, argon arc welding welding equipment of the present invention comprises: welding gun support 1, lever arm 2, argon arc welding welding gun 3, assembly tooling 4 and horizontal positioner 5: welding gun support 1 vertically is provided with, the bottom fixes on the ground; Lever arm 2 is horizontally disposed with; One end is movably connected on the welding gun support 1, can on welding gun support 1, moves up and down, and argon arc welding welding gun 3 is set the other end and this argon arc welding welding gun 3 rifle heads are horizontally disposed with, working face is perpendicular to welding point 7 outsides of shaft part 10 junctions.Horizontal positioner 5 supporting shaft parts 10 also drive it and rotate around longitudinal center line, and this horizontal positioner 5 positioner that is electrodeless variable-speeds, link with argon arc welding welding gun 3.Assembly tooling 4 bottoms are fixedly connected horizontal positioner 5, cooperate, the little internal diameter main shaft 8 of fixed bearing, make that shaft part 10 vertically is provided with, lap fit is installed on the upper surface of horizontal positioner 5.Special-purpose assembly tooling 4 is fixed on the horizontal positioner 5, and the external diameter of assembly tooling 4 cylinders is than the little 10～20mm of internal diameter of little internal diameter main shaft 8, and the height of assembly tooling 4 is higher than the center of gravity 400～500mm of little internal diameter main shaft 8 rigging positions.
As shown in Figure 3, during vertical assembling, because little internal diameter main shaft 8 weight are bigger, make the workpiece location difficulty, and as need adjustment significantly also to waste time and energy.Therefore; Assembly tooling 4 that the present invention is special; This assembly tooling 4 comprises base and cylinder, and base is a disc, is arranged on the horizontal positioner 5 that the upper surface of disk is a horizontal plane; Cylinder vertically is provided with, is fixedly connected the upper surface of disk, the inwall of the outer peripheral face corresponding matching shaft part 10 of cylinder.This assembly tooling 4 is after accurately locating on the horizontal positioner 5, and secure fixation is on the upper surface of horizontal positioner 5 again.
During assembling, at first shaft part 10-1 is socketed on the cylinder, the lower surface of shaft part 10-1 closely contacts with disk upper surface, makes shaft part 10-1 vertically be provided with vertically; Then,, make the welding point 7 corresponding assemblings on the mutual corresponding end face of shaft part 10-1 and 10-2, form weld seam 12 at shaft part 10-2; The dress postwelding along little internal diameter main shaft 8 axle body cylindricals, stride the auxiliary lacing wire 11 of weld seam 12 welding, the amount of contraction of control weld seam 12, ensures the variation of safe and reliable in the manufacture process, control axiality, the depth of parallelism.So, accomplish the vertical assembling between shaft part 10-1 and the 10-2, adopt again to go on successively, up to the vertical assembling of accomplishing whole little internal diameter main shaft 8.When little internal diameter main shaft 8 vertical assemblings, this assembly tooling 4 guarantees that assembling and positioning are accurate, guarantees assembling process safety, can rigging error be controlled in the 10mm.
In the argon arc welding welding process, adopt heated filament automatic tungsten anode argon arc welding horizontal position welding technology, under the double action of preheating wire welding and use pulse, the input of welding process heat declines to a great extent but the molten bath is stable, and welding quality is greatly improved.Welding process has used single rifle from moving technology, but continuous sequence 8～10 hours.In this specific embodiment, use the video acquisition device that waits of camera, the real-time process and the effect that are used to observe welding, simultaneously, the operator needs to note observing tungsten electrode scaling loss situation at any time, in time changes.
Utilize peripheral lacing wire 11 to add the home position of prime coat and the 2nd layer of fixing little internal diameter main shaft 8 of segmentation welding, reduce overall shrinkage amount and axiality and change.In the welding process, be to guarantee safety, need shaft part 10 void in top are hung in the driving, prevent that top shaft part 10 from toppling over Insulating Hanging Belt.Simultaneously, be equipped with special-purpose grinding tool, the defective of finding in the root weld is in time cleared up.
Welding is at first carried out nondestructive inspection after accomplishing, and adopts common ultrasound examination to combine the diffraction time difference method ultrasonic detection technology, and butt welded seam 12 detects, and avoids defective to fail to judge, judge by accident.After the flaw detection, remove peripheral lacing wire 11, carry out later welded.
So, utilize narrow gap tungsten electrode argon arc welding equipment, accomplish the bottoming and the root weld at little internal diameter main shaft 8 welding points 7 places, and it is qualified to detect a flaw, accomplish first step welding sequence in the horizontal position.
As shown in Figure 4; The Lincoln weld of narrow gap is adopted in submerged-arc welding; And adopt the weldering of horizontal dress during this submerged-arc welding, the little internal diameter main shaft 8 that is about to after bottoming and the root weld is horizontally disposed with vertically, with submerged-arc welding welding gun 6 vertically be provided with, the welding point 7 of corresponding shaft part 10 junctions.
Submerged-arc welding welding equipment of the present invention comprises: welding gun support 1, lever arm 2, submerged-arc welding welding gun 6 and turning rolls 9: welding gun support 1 vertically is provided with, the bottom fixes on the ground; Lever arm 2 is horizontally disposed with, and an end is movably connected on the welding gun support 1, can on welding gun support 1, moves up and down, and the other end is provided with the setting of submerged-arc welding welding gun 6 and this submerged-arc welding welding gun 6 rifle head erects, working face perpendicular to the weld seam 12 on the little internal diameter main shaft 8.Turning rolls 9 axially is horizontally disposed with, the little internal diameter main shaft 8 of horizontal supporting, makes little internal diameter main shaft 8 be horizontally disposed with and rotate in perpendicular around longitudinal center line, and this turning rolls 9 and 6 interlocks of submerged-arc welding welding gun.
After first step welding sequence is accomplished, little internal diameter main shaft 8 integral installations are winched to turning rolls 9 through crosshead, weld seam 12 is preheated to 107 ° after, again in the downhand position, carry out narrow gap automatic submerged arc welding groove section welding.After the submerged-arc welding welding is accomplished, at first carry out nondestructive inspection, adopt common ultrasound examination to combine the ultrasonic detection technology of diffraction time difference method, butt welded seam 12 detects, and avoids defective to fail to judge, judge by accident.
So, that accomplishes little internal diameter main shaft 8 welding points 7 places fills out meat and cover welding, and it is qualified to detect a flaw, and accomplishes the second step welding sequence.
As shown in Figure 5, being provided with corresponding assembling seam b, arranged outside in the inboard of the junction of adjacent shaft part 10 has welding point 7.Assembling seam b is arranged on the little internal diameter main shaft inwall a position, adopts the pattern of internal and external stopper, retrains axiality, the faces parallel of vertical assembling, only need finely tune during assembling to get final product, and guarantees assembly precision.The groove of welding point 7 is made up of three sections cambered surfaces, is respectively argon arc welding groove c, changeover portion d and submerged-arc welding groove e, and three's slyness is connected to become a step-like curved surface.
When little internal diameter main shaft 8 carries out setting down; Must process bevel for welding on the end face of each shaft part 10; Promptly respectively above-mentioned three sections grooves are processed: the degree of depth of argon arc welding groove c calculates through the intensity of weld seam 12, and the intensity of this weld seam 12 must satisfy the maximum load that little internal diameter main shaft 8 possibly receive in manufacture process (lift by crane, stand up etc.).The degree of depth of submerged-arc welding groove e is residue groove thickness; Changeover portion d between the two adopts positive and negative R rounding off.
The width of weld seam 12 is by thickness, weld seam 12 amounts of contraction and the decision of weld seam 12 surplus Several Factors of welding gun, and through calculating, bevel angle is 1 °～2 °.In the groove design, confirming of weld seam 12 amounts of contraction is the most important, as does not take into full account the amount of contraction of weld seam 12, and folder rifle incident can take place in welding process, causes weld defect to produce, and also can produce the not enough problem of postwelding processing capacity simultaneously.Weld seam 12 amounts of contraction receive parameter influences such as the thickness, assembly technology, welding conditions, 8 each section deadweights of little internal diameter main shaft of seam b, and weld seam 12 shrinks and is approximately 4～8mm.
After welding is accomplished, tackle little internal diameter main shaft 8 and carry out stress relief annealing, need effectively support after little internal diameter main shaft 8 is winched to annealing furnace, prevent that the medium and small internal diameter main shaft 8 of annealing process from occuring bending and deformation jackshaft section 10.According to weld seam 12 endface position, can make special-purpose machinery by oneself (internal diameter and the cylindrical) of little internal diameter main shaft 8 carried out fine finishining, to smooth, it is qualified to carry out nondestructive inspection again with weld seam 12 polishings, accomplishes the finished product of the little internal diameter main shaft 8 of back acquisition.
To the welding point 7 of this particular design, can adopt 2 kinds of schemes during narrow gap automatic tungsten anode argon arc welding bottoming welding: 1, adopt the single welding root back side shapeless, carry out integral body processing after the completion; 2, adopt the one side welding with back formation technology, the back side does not process or only processing is local.
As shown in Figure 6, adopt the narrow gap automatic tungsten anode argon arc welding technology welding of single welding.Be to guarantee the quality of weld seam 12, seam b can not through welding, and the root of weld seam 12 has the root face of 1～2mm approximately, and welding accomplishes the back, the interior circle to little internal diameter main shaft 8 is carried out integral body processes.
As shown in Figure 7, adopt the narrow gap automatic tungsten anode argon arc welding technology welding of single face welding and double face shaping.With seam b through welding, sealing run 13 moulding are good, can carry out partial operation to it according to designing requirement and perhaps not process.
Adopt the main points of the inventive method to be: 1, special-purpose assembly tooling 4 to be fixed on the horizontal positioner 5; The external diameter of assembly tooling 4 cylinders is than the little 10～20mm of internal diameter of little internal diameter main shaft 8; With shaft part 10-1,10-2 ... Be socketed in successively in the assembly tooling 4, the height of assembly tooling 4 is higher than the center of gravity 400～500mm of little internal diameter main shaft 8 rigging positions.2, utilize seam b on the welding point 7 to retrain axiality, the faces parallel of vertical assembling, only need finely tune during assembling and get final product.3, dress postwelding, along little internal diameter main shaft 8 axle body cylindricals, stride the auxiliary lacing wire 11 of weld seam 12 welding, can reach control weld seam 12 amount of contraction, ensure purpose safe and reliable in the manufacture process, that the control axiality changes.
As shown in Figure 8, be welded as operational instances with the segmentation of the little internal diameter hollow spindle 8 of certain through-flow machine, introduce the processing method of this little internal diameter main shaft 8.The maximum outside diameter of this little internal diameter main shaft 8 is of a size of Φ 2510mm, internal diameter Φ 600mm, and length is 9934mm; Weight 113848Kg. is divided into 4 sections forgings.It is that 1636mm, shaft part 10-2 are that 5000mm, shaft part 10-3 are that 1979mm, shaft part 10-4 are 1510mm that this four segment length is respectively shaft part 10-1, and wall thickness is 338mm.
Concrete technology is following:
1, forge four sections shaft part 10-1,10-2,10-3 and 10-4 respectively, and processing welding point 7: seam b thickness is 4mm; The degree of depth of argon arc welding groove c is that 20mm, width are that 15～15.6mm, bevel angle are monolateral 1 °; The degree of depth of changeover portion d is 15.5mm, width 15.6～28mm; The degree of depth of submerged-arc welding groove e is that 299mm, width are 28～37mm, and bevel angle is monolateral 1.26 °.And it is 3.2 that the groove roughness of this welding point 7 requires.
2, assembling: at first, vertical assembling, welding shaft part 10-1 and shaft part 10-2, after welding was accomplished, 10-2 hung horizontal positioner 5 with shaft part 10-1+ shaft part; Then, vertical assembling, welding shaft part 10-3 and shaft part 10-4, welding obtains shaft part 10-3+ shaft part 10-4 after accomplishing; Again shaft part 10-1+ shaft part 10-2 is lifted to the top of shaft part 10-3+ shaft part 10-4, make it overlapping assembling, welding.After 12 assemblings of wall scroll weld seam are accomplished,, be the equilateral distribution of 120 degree in 3 lacing wires 11 of peripheral joint welding of weld seam 12.Assembling axiality requirement≤0.5mm, levelness≤0.5mm.
During vertical assembling, also can weld shaft part 10-1 and shaft part 10-2 earlier, up weld shaft part 10-3, shaft part 10-4 more successively respectively, make it become a bearing.Perhaps, take other orders.
3, argon tungsten-arc welding groove c section welding: divide three sections welding prime coats and the 2nd layer, be single-run welding.Remove lacing wire 11 after accomplishing, repair welding not welding position is put.Carry out continuous welding then, until accomplishing argon tungsten-arc welding groove c thickness.Welding parameter: background current 160～220A, peak point current 200～280A, voltage 12～14V, speed of welding 30-70mm/min, wire feed rate 40-60mm/min.Nondestructive inspection is qualified after accomplishing.
4, Lincoln weld groove e section welding: electric current 450～550A, voltage 32～36V, speed of welding 360-420mm/min.Nondestructive inspection is qualified after accomplishing.
In the above-mentioned steps 2～4, can be after shaft part 10-1+ shaft part 10-2 argon arc welding welding be accomplished, directly the welding point between it 7 is carried out submerged-arc welding fills out meat, capping, again to accomplishing the welding of shaft part 10-3+ shaft part 10-4.Perhaps take other order, mode.
5, postwelding stress relief annealing: use water-soluble antioxidizing paint protection centering section and after the middle part of shaft part 10-2 is supported, carry out stress relief annealing.580 ± 10 ℃ of annealing temperatures, temperature retention time 16h.It is qualified to carry out nondestructive inspection after the completion.
6, processing: utilize large-scale vertical lathe and depth drill equipment, little internal diameter main shaft 8 is carried out cylindrical and interior circle processing.Obtain the main shaft finished product after accomplishing.
Claims (8)
1. the manufacturing approach of a little internal diameter hollow spindle; Said processing method is divided into little internal diameter main shaft the plurality of sections shaft part, carries out setting down respectively earlier; After being welded into integral body, again with little internal diameter main shaft stress relief annealing, to its cylindrical and in the circle fine finishining, obtain finished product; It is characterized in that: the welding point inboard of said adjacent shaft part is that assembling seam, the outside are weld grooves; Said welding is divided into two steps: adopt argon arc welding to feel secure and root weld earlier, adopt submerged-arc welding to fill out meat, capping again.
2. the manufacturing approach of little internal diameter hollow spindle according to claim 1; It is characterized in that: vertical dress weldering is adopted in said argon arc welding; Be about to shaft part vertically setting vertically, lap fit installation, and rotate around its axis, the argon-arc welding gun head is horizontally disposed with, the welding point of corresponding shaft part junction.
3. the manufacturing approach of little internal diameter hollow spindle according to claim 2; It is characterized in that: said vertical dress adopts assembly tooling that shaft part is cooperated and installs when welding; This assembly tooling comprises base and cylinder; Base is a disc, is arranged on the horizontal positioner that cylinder vertically is arranged on the upper surface of disk, the inwall of the outer peripheral face corresponding matching shaft part of cylinder.
4. the manufacturing approach of little internal diameter hollow spindle according to claim 1; It is characterized in that: horizontal dress weldering is adopted in said submerged-arc welding; Soon the shaft part after bottoming and the root weld is horizontally disposed with vertically and rotates around its axis, and submerged arc welding gun head erect is provided with, the welding point of corresponding shaft part junction.
5. the manufacturing approach of little internal diameter hollow spindle according to claim 1 is characterized in that: said argon arc welding is the heated filament tungsten argon arc horizontal position welding of narrow gap.
6. the manufacturing approach of little internal diameter hollow spindle according to claim 1 is characterized in that: said submerged-arc welding is the Lincoln weld of narrow gap.
7. the manufacturing approach of little internal diameter hollow spindle according to claim 1 is characterized in that: said weld groove comprises argon arc welding groove and submerged-arc welding groove, is connected to become a step-like curved surface through two R rounding ofves between the two.
8. the manufacturing approach of little internal diameter hollow spindle according to claim 1 is characterized in that: the segmentation position of said shaft part is arranged on the low stress area of little internal diameter main shaft.
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| CN103769720A (en) * | 2013-12-28 | 2014-05-07 | 柳州市江航工贸有限公司 | Welding structure for circular seam welding |
| CN104353969A (en) * | 2014-10-29 | 2015-02-18 | 苏州市金德誉精密机械有限公司 | Processing technology for supporting seat of base |
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| CN103769720A (en) * | 2013-12-28 | 2014-05-07 | 柳州市江航工贸有限公司 | Welding structure for circular seam welding |
| CN104353969A (en) * | 2014-10-29 | 2015-02-18 | 苏州市金德誉精密机械有限公司 | Processing technology for supporting seat of base |
| WO2016173314A1 (en) * | 2015-04-27 | 2016-11-03 | 江苏金通灵流体机械科技股份有限公司 | Method for welding hollow main shaft and solid shaft head |
| CN105750844A (en) * | 2016-04-29 | 2016-07-13 | 沈阳透平机械股份有限公司 | Processing method for hollow spindle of compressor |
| CN106001971A (en) * | 2016-05-25 | 2016-10-12 | 东方电气集团东方汽轮机有限公司 | Automatic 2G-welding-position narrow-gap welding method for steam turbine valve thick-wall connection tube |
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| CN110576293A (en) * | 2019-09-25 | 2019-12-17 | 博戈橡胶塑料（株洲）有限公司 | Method for manufacturing segmented combined thrust rod spherical hinge mandrel and thrust rod spherical hinge mandrel |
| CN110576293B (en) * | 2019-09-25 | 2022-02-22 | 博戈橡胶塑料（株洲）有限公司 | Method for manufacturing segmented combined thrust rod spherical hinge mandrel and thrust rod spherical hinge mandrel |
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| CN115041860B (en) * | 2022-06-09 | 2023-11-14 | 哈尔滨电机厂有限责任公司 | Water and electricity superhigh water head unit gauge head body welded structure |
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Application publication date: 20120502 |