CN1058425C - Process for production of seamless steel pipe by using plastic deforming method and apparatus thereof - Google Patents

Abstract

The present invention relates to a novel method for manufacturing seamless steel pipes, which comprises: a cold pipe blank is partially retarded by the internal resistance and the external resistance generated from the rotation of a forming mould; the cold pipe blank changes plastically owing to the heat generated from the slippage and the fractures of crystal grains, so that the cold pipe blank is extruded to form. The method of the present invention has the advantages of simple technique and energy saving; the ratio of the external diameter to the wall thickness of the finished pipe reaches higher than 100; the method of the present invention can be used for producing pipes with random lengths, and pipes with special-shaped inner cavities. The equipment of the method of the present invention comprises a forming assembly part used as the core, a driving part, a supporting housing window and a thrust part, wherein the forming assembly part contains a forming mould; the equipment of the present invention has the advantages of light total weight, small quantity of components, and small land occupation.

Description

The method of production of seamless steel pipe by using plastic deforming method and equipment thereof

The present invention relates to a kind of method and equipment thereof of producing seamless steel pipe, specifically, relate to and a kind ofly utilize the fission of cold base material crystal grain to produce heat to make base material part reach the flow temperature and the method for producing seamless steel tube and the equipment thereof of extrusion molding.

Seamless steel tube production adopts hot-rolling method at present, need firing equipment, not only consume big calorimetric, electric energy, and essential multi-pass deformation, after post bake is heat-treated, thereby it is big to account for production site, the production cost height, in addition, producing the tubing specification all is blank than the value of wall thickness greater than 30 scopes at caliber.

The inventor has at first proposed to utilize friction effect to give birth to the method for heat, extruding production seamless steel pipe in authorized No. 90102686 patents (calling 90 ' patent in the following text), this method roof pressure blank reverse molding, its efficient is high not enough, then is restricted during moulding tubule diameter pipes.

The object of the present invention is to provide a kind of use the high efficiency of cold blank, accurately produce seamless steel pipe, reach big caliber method and apparatus to the tubing specification of wall ratio.

Another object of the present invention is to provide a kind of utilize cold blank produce any length, can reach big caliber method and apparatus to the seamless steel pipe of wall ratio.

Another purpose of the present invention is to provide a kind of movable type to produce long seamless steel pipe equipment arbitrarily continuously.

A further object of the present invention is to provide the equipment of the seamless steel pipe of producing special-shaped inner chamber and outer wall.

Steel plate bends repeatedly and can make its fracture, and simultaneously in the quite high temperature of the local generation of bending, this is that energy changes the cause of heat energy form into because the slippage mutually before this of steel crystal grain is torn then.Control cold base appearance and inner grain sliding speed difference, grain fragmentation allows the heat that discharges make this temperatures at localized regions reach the flow temperature, can allow the tubing of the required specification of base material distortion moulding.Described speed difference is bigger, tears coarse grain and releases and can heal soon, and it is narrower that the humidity province that reaches becomes.This grain sliding is by reaching for the blank appearance do relative motion with resistance, and method of the present invention is based on this principle and forms.The present invention includes following steps:

The cold blank of tubing is headed into the shaping mould of being made up of inside and outside resistance ring as push rod; Make interior and/or the external resistance ring drives rotation by rotating power machine; Blank is stagnated by the resistance loop resistance and is being blocked local grain sliding and the cracked and living heat of taking place at 2-3 in time second; Control jacking force and resistance ring rotating speed cause the speed official post heating part between blank and the resistance ring to reach material flow temperature; In case reach this temperature, this part blank becomes real blank by push rod, and the blank material of distortion is a seamless steel pipe via the extrusion molding of inside and outside resistance interannular.

Whole shaping works of the inventive method steel pipe are only finished in short-term in the zonule of shaping mould, therefore use protective atmosphere and heat treatment if desired, all can be in very little space easily, carry out economically.

In above step; if blank is without interruption piecemeal; the moulding seamless steel pipe just can be extruded continuously, because inside and outside resistance ring place base material is subjected to layer by layer, grain sliding and carry out crystal grain reorganization step by step, so the blank seam is to the evenly not influence of grainiess of shaping pipe.Successively two sections blank joints can be made the castellated composition surface with or without tapering, and this juncture can make blank hold out against the retardance of resistance ring and unlikely being driven to rotate, thus the effect that reduces to tear crystal grain.

Method particularly suitable cast tube blank of the present invention because cast tube blank crystal grain is thick, more helps being torn, slippage, produces heat.

Say that on essential meaning the friction method that the method for this patent and the inventor formerly invent (90 ' patent) has very big difference, because work principle difference causes on the structure, the difference on the duty.

The present invention is through extruding on the structure extruding, and extrudes and 90 ' patent is reverse eversion type, and it is different that this result comes from two invention principles.The present invention relies on the retardance between ejection force and blank, the resistance ring to cause the material grains slippage, break and recombinate; and do not require that friction generates heat in a large number; the appropriate level of described retardance is grasped with the speed difference between blank, the resistance ring and the cooperation of ejection force; the working position is in the material flow humidity province; surpass this appropriate level; material is in the duty that soft state will be 90 ' patent on a large scale; material is from the moulding of mould forward under this state, but the reverse extrusion molding of turning up as 90 ' patent.Its efficient of the method for 90 ' patent is much worse than method of the present invention.

Studies show that, the linear velocity that the inventive method is used can be 3-10M/sec, reasonable preferable range is 4-7.5M/sec, the 5-15 that ejection force is chosen with the intensity (elevated temperature strength) under the best flow temperature of material doubly converts, preferred multiple is for being no more than 12 times, and this collocation has better effects.

Equipment of the present invention comprises: moulding assembly portion, heat treatment ring, moulding assembly drive division, back shaft and thrust portion.

Moulding assembly portion is made of the shaping mould of forming with inside and outside resistance ring, be subjected to drive division drive in and/or the external resistance ring rotate, cause the relative motion of inside and outside resistance interannular; As being the place ahead to go out tube side, then the heat treatment ring is positioned at before the moulding assembly portion, is a water jacket, supplies with adjustable cooling water by the hole in the back shaft and is used for cooling forming tubing; Back shaft supports blank and is subjected to the thrust portion ejection to enter the moulding of moulding assembly portion at moulding assembly portion rear.

Forming part is a core in the each several part of above equipment, and it is the part that accounts for very little space, though so the present invention belong to rolling mill, complete equipment is in light weight, volume is little, can all be arranged on the vehicle chassis, constitutes a portable seamless steel pipe extruder.When blank without interruption piecemeal, just become the portable long seamless steel pipe extruder arbitrarily of producing continuously.

The inventive method is by the direct extrusion molding seamless steel pipe of cold base pipe material, therefore it does not need preheating and post bake than traditional hot rolling method, save the energy of required consumption thus, and because the required kinetic energy of this law is also little, so the inventive method is the method for a kind of province energy.

Secondly, needing multi-pass rolling deformation, particularly casting ingot in traditional hot, cold-rolling process, all is thick cast sturcture, more needs a lot of passage distortion, after normalizing just can reach the brilliant material of requirement grade.The present invention is one-shot forming then, and the refinement of brilliant material so the inventive method technology is simple, especially is fit to the pipe material of casting, can the thick brilliant material of primary fragmentation.

The 3rd, the inventive method flow, to extrude in slight mould and finish, equipment is both little and few, and shared production area is little.

The 4th, the inventive method is produced seamless steel pipe can accomplish the ratio of great caliber to tube wall, this value before ending in the conventional method less than 30, and can reach 100 in this law, even can reach 200.

The 5th, can produce the product specification that the technology of present use can not done with the inventive method.Produce seamless pipe with the inventive method, its specification in principle without limits.

The 6th, seamless steel pipe precision height, cost that this law is produced are low, and excellent protection atmosphere is set and the moulding pipe is done heat treatment immediately at moulding assembly portion place easily, simple procedure, even easy oxidation metal, the finished product material is ensured the quality of products.

The 7th, this law can accomplish to produce any long seamless steel pipe.

The 8th, because a moulding assembly portion requires steadily of centre of gravity, by the steadily of centre of gravity design, do not do the ground fixed installation and just can move, so, can realize removableization of seamless steel pipe extruder, now squeeze existing shop serially at scenes such as laying petroleum transportation pipeline, save expenses such as finished product transportation, saving welding, consider that especially the fished pipe traffic expense is higher 2 times than fee of material, this point is very big advantage, reduces or remits the quality that welding job can improve the oil transportation pipeline in addition.

The 9th, studies show that, the flow temperature keeps stable in the inventive method, promptly narrower, be difficult to process or the steel grade that narrow flow temperature province is arranged that can not be rolling for hot rolling technology, adopt cast tube to be reprocessed into 2 long ways at present as the type high temp petroleum cracking tube (as polyethylene cracking funace boiler tube) of Cr25Ni20, this kind technology is very difficult for the caliber less than 70mm, we's rule is not limited, and on the contrary, condition just in time is fit to.

The tenth, can produce the pipe of inner chamber abnormity with the inventive method, this is effective to increase and the oil contact area when making cracking coil, can effectively increase output, owing to also having increased pipe high temperature rigidity, has improved boiler tube service life.

Describe embodiment in detail below in conjunction with accompanying drawing, these accompanying drawings are:

Accompanying drawing 1 is the flow chart of the inventive method.

Accompanying drawing 2 is to use the layout of equipment of an embodiment of the inventive method.

Accompanying drawing 3 (a) ~ (c) is the formation structural representation of moulding assembly portion in the present device.

Accompanying drawing 4 is risk one's life figure of topology example of blank.Fig. 4 (a) is its elevation cross-sectional view, and Fig. 4 (b) is its side view.

Accompanying drawing 5 is structural representations of the portable seamless steel-tube making machine of the present invention.

Fig. 2 is the layout of equipment of first embodiment of the invention.1 is production tube exhaustion mechanism and servo-actuated saw among the figure, and 2 are the transmission friction wheel, and 3 is motor, 4 is reducing gear, and 5 are the heat treatment ring, and 6 are moulding assembly portion, 7 is back shaft, and 8 is main memorial archway, and 9 is push action cylinder portion, 10 is gusset piece, and 11 are the transition memorial archway, and 12 is support, 13 is water inlet pipe, 14 for supporting memorial archway, and 15 are self-feeding oil cylinder portion, and 16 are the self-feeding case.

Cold blank pipe is pushed by transition memorial archway 11 from self-feeding case 16 by self-feeding oil cylinder army 5 and supports on the back shaft of memorial archway 14 and 8 supports of main memorial archway, blank is entered in unlined garment has by the ejection of push action cylinder department, the moulding assembly minister of the shaping mould that the external resistance ring is formed, about interior, the external resistance ring will be described below, the individual resistance ring of moulding assembly portion 6 is driven into 1000RPM by drive motors 3 through reducing gear, motor 3 can be interchange or the direct current generator or the torque motor of adjustable speed, power supply power supply by the band speed regulator, use blank to be of a size of external diameter φ 118-122mm for this example as the cast-steel pipe of carbon steel, wall thickness 8-10mm produces φ 100mm, under the production tube situation of wall thickness 1mm, adapted power of motor 35-55KW is own enough.Blank head is stagnated by inside and outside resistance loop resistance, and afterbody is subjected to push action cylinder portion 9 with 10Kg/mm ²The pressure ejection, speed difference inside and outside this head position forms crystal, crystal grain is torn rapidly, slippage, living hot, and local temperature is elevated in this example and is 950-1000 ℃, is in the flow warm area of material, blank is deformed then, under thrust, be production tube, be in heat treatment immediately and be no more than water flowing cooling in 2 seconds, pull out backward again by extrusion molding between the inside and outside resistance ring, the blank penetration rate is not less than 1.6mm/sec, and trombone slide prestressing force is not more than 20% of high-temp plastic intensity.Above process reach best flow temperature the fixed time should be 2-3 second.

About charging, also will use in existing hot rolling production technology, shown in Fig. 2 is three memorial archways (main memorial archway 8, transition memorial archway 11, support memorial archways 14), opens and supports memorial archway 14, blank is pushed into and supports in the memorial archway, after closing the support memorial archway, open transition memorial archway 11, blank is continued to push in the transition memorial archway, after closing the transition memorial archway, open main memorial archway 8, blank enters main memorial archway the place ahead, goes into moulding assembly portion 6 by 9 ejections of push action cylinder system.Follow-up blank is all undertaken by this program.Use more memorial archways structurally complicated, but the stability that is in operation to get well, wherein accept or reject and to determine according to mission requirements, repeat no more herein a Facilities Engineer.

Fig. 3 is the schematic diagram that moulding assembly portion constitutes.Its Fig. 3 (a) is the signal of first kind of structure for inside and outside resistance ring; Fig. 3 (b) is that second kind of structure, internal resistance ring are the signals of first kind of structure for the external resistance ring; Structural representation when Fig. 3 (c) is second kind of structure for inside and outside resistance ring.20 is first kind of structure external resistance ring among the figure, 21 is overcoat, 22 are external resistance ring base plate, 23 is the outer resistance ring that quickens, and 24 is the spherical second kind of external resistance ring of flying disc type, and 25 is each internal resistance ring, 26 is second kind of resistance ring of interior acceleration, 27 is internal resistance ring base plate, and 28 is the shaft extension of dish shape ring, and 29 is the spherical second kind of internal resistance ring of flying disc type.

External resistance ring shown in Fig. 3 (a) 20 is for having the annulus of planar end surface, establish charging aperture (a point) on one of them end face, the other end is outlet spout (a b point), the charging aperture aperture is not less than the blank external diameter, the annulus inner cavity surface is the tubaeform circular arc camber (ab section) that shrinks from a point to the b point, the radius of curvature of ab section circular arc is Υ _OutwardThe footpath was the production tube external diameter within the b point was of living in, can set up the following bc section of b point for increasing resistance ring intensity, this is an expanding reach, the aperture is greater than the production tube external diameter, so that pipe is extruded, shown in internal resistance ring 25 also be annulus (or cylinder) with planar end surface, one of them end face is charging aperture (a ' point), and the other end is outlet spout (b ' point), and is relative with the external resistance ring respectively, from the charging aperture to the outlet spout, form and shrink the conical surface or tubaeform circular arc camber, the footpath was the production tube internal diameter outside b ' point was of living in, and the external diameter of charging aperture is the blank internal diameter, is equal to the production tube internal diameter and can omits the decimal millimeter in the casting error range.The internal resistance ring is static in scheme shown in this figure not to be changeed.Just become straightway when a ' b ' section circular arc radius of curvature is very big, this section of internal resistance ring curved surface becomes the conical surface by circular arc camber.When blank is headed into the resistance ring, the external diameter sharp corner arrives workspace (ab section), because of and the external resistance ring exist relative motion to be blocked, reach the flow temperature, blank is subjected to squeeze and extrudes through the bc section, bb ' spacing constitutes the production tube pipe thickness.Bc (b ' c ') section is an expanding reach, and nonessential, establishes this expanding reach and only helps to strengthen resistance ring intensity.

Fig. 3 (b) is the resistance ring structure that first embodiment uses, and promptly its internal resistance ring is first kind of structure, and the external resistance ring has used a kind of second kind of structure that be called as.So-called second kind of structure is such: have to be a circular outer resistance ring 23 and the base plate 22 of quickening of planar end surface, accompany at least three dish shape resistance rings 24 therebetween, have overcoat 21 fixing on the periphery.Dish shape ring 24 is that a radius is Υ _OutwardBall therein heart plane up and down by two parallel planes interceptings one section dish shape thing, on lower plane on the dish shape ring, respectively protrude a shaft extension 28, outside laying respectively at, described shaft extension 28 quickens resistance ring 23 and base plate 22 corresponding in the groove on the plane, dish shape ring 24 can be rotated around the axis that two shaft extension 28 lines form, simultaneously, can in described ring groove, move again but can not deviate from.The sphere of dish shape ring 24 and outer quicken resistance ring working face common in by the longitudinal section at dish shape ring center to constitute a radius of curvature be Υ at one _OutwardSame circular arc, described Υ _OutwardAnd the ratio of blank wall thickness δ is relatively good between 1-5, is preferably between the 1.2-2.Described at least three dish shape rings 24 are arranged on one week at groove should make the gap that 0.3-1mm is arranged between adjacent two rings, does not hinder rotation mutually, is similar to the ball in the raceway.Having on the other end of described outer acceleration resistance ring 23 is the hole of charging aperture, and the aperture is not less than the blank external diameter; Global peak of described dish shape is equivalent to the b point among Fig. 3 (a), and it is on the external diameter that is equivalent to production tube, belongs to Guan Pin, and the aperture of described base plate 22 then is not less than the production tube external diameter.Then with identical shown in Fig. 3 (a), require also identical as for the internal resistance ring.

Above so-called acceleration resistance ring title source enters the boost phase of flow state herein for blank, and blank deformation shrinks, gradually after dish shape ring 24 is shaped to production tube.

Use second kind of resistance ring structure can make the production tube surface quality better.

Figure 3 (c) then all adopts the situation of second kind of structure for inside and outside resistance ring, be applicable to that inside and outside resistance ring all rotates, but mutual switched in opposite is in order to avoid weaken retardance strength.It all is similar being used for the external resistance ring or being used in the internal resistance ring about second kind of structure, 26,27 is respectively interior acceleration resistance ring and inner bottom plating corresponding to label 23,22, about dish shape ring 29 when the production tube internal diameter hour, can be exactly one, otherwise interiorly equally with the external resistance ring establish at least three dish shape rings the interior cover of the overcoat 21 that is equivalent to the external resistance ring [not shown among Fig. 3 (c)] is arranged simultaneously.Allow the blank internal diameter less than the production tube internal diameter in the case.The scheme of internal resistance ring rotation implements more complicated on the structure.

Because the resistance ring will bear high temperature and brute force, should select for use high temperature resistant and have under the high temperature high-intensity material and make, take the machinability of material into consideration.Adoptable material has and contains M. greater than 60% molybdenum-base alloy, and for example molybdenum-titanium alloy is surfaces nitrided, or silicon nitride and carbon fibre composite.

Second embodiment of the invention is about the continuous production example of long seamless steel pipe arbitrarily, and problem crucial in this example is continuing of blank.Fig. 4 is a kind of schematic diagram of shape example of blank head and tail.Wherein Fig. 4 (a) is an elevation cross-sectional view, and Fig. 4 (b) is its side view.Offer the groove of band tapering on the head end outer peripheral face of every section blank equidistantly, and offer the groove of band tapering on the tail end inner peripheral surface equidistantly, so the head end of back segment blank just in time can embed the tail end that is matched with the leading portion blank.Two sections blanks in front and back of making castellated joint like this do not have and relatively rotate.When these junction surfaces enter moulding assembly portion blank be intragranular outward successively helically do slippage and reorganization, crystal grain reorganization finishes in finished product tubing, becomes the close crystal particle structure of Cause of uniformity fully, can not find the vestige of seam.

In fact, producing seamless steel pipe with the inventive method scale also can be that blank without interruption is piecemeal extruded continuously, is obtained by servo-actuated saw 1 shown in Figure 2 length cut-out on demand.

The structure of Fig. 4 exemplary, if before and after the blank two sections can counterrotating structure all not be feasible.

The third embodiment of the present invention is to be the example of steel ingot or ingot casting for blank.Because the inventive method is used the pipe material, so ingot should change the pipe material earlier into.Method and apparatus can be used to finish this work shown in the 90 ' patent that the inventor invents, obtained the authorization, therefore with the part of this patent document content as description of the present invention, for avoiding repetition, is omitted herein.Because said method does not use the preheating furnace of present hot rolling or hot-extrusion method needs etc. equally, so above stated specification advantage of the present invention still keeps in this example.

Fourth embodiment of the invention is a kind of portable seamless steel-tube making machine scheme schematic diagram.

With the seamless steel pipe production of the inventive method as can be known from above general introduction and embodiment, though it belongs to the heavy-duty machine category, but there is no the bulky equipment group, do not account for the huge production site area yet, it only is a tuber of forming by a few part, in light weight, it is little to account for area, also having important point is to have only moulding assembly portion to require steadily of centre of gravity, show that after deliberation through the steadily of centre of gravity design, equipment of the present invention is not done the ground fixed installation and just can be driven to move, therefore this just might make a kind of portable seamless steel-tube making machine, and Fig. 5 is its structural configuration schematic diagram.This is the bogie 30 of a kind of loading capacity more than 15 tons, the motor 3, reducing gear 4, heat treatment ring 5, moulding assembly portion 6, back shaft 7, main memorial archway and the transition memorial archway that are provided with on the chassis flat board 31 in the aforementioned present device support memorial archway 8,11,14, whether push action cylinder portion 9 each several parts such as grade add automatic feed oil cylinder portion 15 according to the vehicle and actual conditionses such as the specification decision of producing steel pipe.The hydraulic power of each oil cylinder portion is provided by vehicle power, the power supply of motor 3 or power via speed setting controller by the generator that is installed on another supply vehicle, or directly replace motor 3 and reducing gear 4, this design transaction that to be the designer judge easily according to the spirit of the disclosure of invention by vehicle power.For tubule footpath tuber, power supply is located at drives by this vehicle power together and above scheme there is no and is different in essence.

Embodiment shown in Figure 5 is a kind of example of producing external diameter φ 108mm wall thickness 5-6mm production tube, uses 15 tons load-carrying vehicle.The apparatus arrangement total length is no more than 12 meters.

This vehicle chassis flat board is established support foot 32, is supported on ground when doing the tubulation operation, and it is packed up, and vehicle can drive away.The meaning of portable seamless steel-tube making machine is that tubulation can carry out at the scene of using pipe, the just blank of relatively thick of transportation, and cost of transportation is low, in addition, as long as the pipeline of laying is a straightway, pipe all can be made continuously, the centre does not need weld seam, and engineering cost is low, and the pipeline quality is good.

Though be to be that example is described in this example with the steel pipe of making φ 108, even in fact for making large-scale steel pipe (for example φ 350), use the inventive method, its gross weight of equipment is no more than 25 tons, length overall still is no more than 12 meters, and it also is unchallenged that such situation is made portable tuber.

Fifth embodiment of the invention is to produce the example of special-shaped inner chamber seamless steel pipe.By above description of the invention as can be known, when the internal resistance ring is static when not changeing, the production tube external diameter surface of making is the face of cylinder, surface of internal cavity then depends on the shape of internal resistance ring working face, therefore as long as internal resistance ring working face is made required compromise face, just can make the seamless steel pipe of corresponding special-shaped inner cavity surface, this existing hot rolling, hot extrusion all can not be accomplished, abnormity inner chamber seamless steel pipe is useful in practicality, for example special-shaped inner chamber will make response area increase in petroleum cracking tube, thereby raise the efficiency, increase output.

Can be made on the production tube outer surface the above-mentioned shaped face of scheme that the internal resistance ring rotates, the external resistance ring is static, this is conspicuous, no longer describes in detail.

More than be important, useful to implementing the present invention in all narration about the control of the detection of the structure of the hydraulic control of the speed governing of drive motors, push action cylinder (thrust and drilling depth), each memorial archway and control thereof, temperature and control, water cooling production tube etc., but these all are ripe in prior art, need not in this manual to have described in detail.

The present invention is illustrated with embodiment, but should not only limit to embodiment, and those skilled in the art may make change to this, and these changes still belong in the spirit and essential scope that is shown by appended claims.

Claims (17)

1, a kind of flow method of producing seamless steel pipe is characterized in that the cold blank of tubing is gone in the shaping mould that is made of inside and outside resistance ring with the ejection force ejection doubly of the elevated temperature strength 5-15 under the base material flow temperature.

In described and/or the external resistance ring drive rotation by rotating power machine; Blank be subjected to the blank wire speed be that the resistance loop resistance of the relative motion of 3-10M/sec stagnates down, the brilliant material of material produces slippage and breaks gives birth to heat, reaches material flow temperature;

Blank deformation, extrusion molding between inside and outside resistance ring forms seamless steel pipe.

2, according to the flow method of the production seamless steel pipe of claim 1, it is characterized in that preferred described linear velocity is 4-7.5M/sec, preferred described ejection force multiple is to be no more than 12 times.

3,, it is characterized in that described blank head makes castellated joint, for producing long seamless steel pipe arbitrarily according to the flow method of the production seamless steel pipe of claim 1 or 2.

4, a kind of equipment with production of seamless steel pipe by using plastic deforming method comprises moulding assembly portion (6), moulding assembly drive division (3,4), back shaft (7) and supporting memorial archway (8,11,14) thereof, thrust portion (9), and described moulding assembly portion is made up of inside and outside resistance ring; It is characterized in that described external resistance ring drives rotation by described moulding assembly drive division; Described internal resistance ring is bonded to described back shaft spindle nose; Described back shaft is by at least three described memorial archway supportings, for the blank pipe box thereon; Described external resistance ring (20) is for having the annulus of planar end surface, establish charging aperture on one end face, the other end is an outlet spout, the annulus inner cavity surface is tubaeform for what shrink from the charging aperture to the outlet spout, the outlet spout internal diameter is the production tube external diameter, the charging aperture internal diameter is not less than the blank external diameter, and described tubaeform is circular arc camber, and the circular arc radius of curvature is Υ _Outward

Described internal resistance ring (25) is for having the annulus or the circular cone post of planar end surface, one end is a charging aperture, the other end is an outlet spout, charging aperture and outlet spout with the external resistance ring is relative respectively, from the charging aperture to the outlet spout, form to shrink the conical surface or tubaeform, the outlet spout external diameter is the production tube internal diameter, and the charging aperture external diameter is the blank internal diameter.

5, according to the equipment of the production seamless steel pipe of claim 4, it is characterized in that described external resistance ring by planar end surface circular outer quicken resistance ring (23) and the circular base plate of planar end surface (22) in the middle of clamping at least three dish shapes ring (24) form, their periphery has overcoat (21) fixing; Described dish shape ring is that radius is Υ _OutwardBall be parallel to the dish shape thing that two planes of its central plane intercept, shaft extension (28) is arranged on the biend, stretch into and be formed in the described outer groove that quickens on resistance ring (23) and base plate (22) corresponding end-faces, described dish shape ring can also can move along described groove around the axis rotation that two shaft extension lines form, described outer hole of quickening on the resistance ring other end is a charging aperture, its aperture is not less than the blank external diameter, global constitutes the tubaeform circular arc camber that shrinks from charging aperture to described dish shape, and described circular arc camber circular arc is center of circle Υ with the dish shape ring heart _OutwardForm, the diameter of global peak inner periphery of living in of dish shape is outlet spout corresponding to the production tube external diameter; Described base plate internal orifice dimension is not less than the outlet spout internal diameter.

6, according to the equipment of the production seamless steel pipe of claim 4, it is characterized in that described Υ _Outward=(1-5) * the blank wall thickness.

7, according to the equipment of the production seamless steel pipe of claim 5, it is characterized in that described Υ _Outward=(1-5) * the blank wall thickness.

8, according to the equipment of the production seamless steel pipe of claim 4, it is characterized in that described Υ _Outward=(1.2-2) * the blank wall thickness.

9, according to the equipment of the production seamless steel pipe of claim 5, it is characterized in that described Υ _Outward=(1.2-2) * the blank wall thickness.

10, according to the equipment of the production seamless steel pipe of any among the claim 4-9, it is characterized in that described moulding assembly portion towards go out tube side to a side establish the heat treatment ring, supply with adjustable cooling water from the back shaft mesopore.

11,, it is characterized in that the tubaeform working face of described internal resistance ring is the shaped face beyond the circular arc camber according to the equipment of the production seamless steel pipe of any among the claim 5-9.

12,, it is characterized in that described equipment is loaded into the portable seamless steel-tube making machine of formation on the flat board of load-carrying vehicle chassis according to the equipment of the production seamless steel pipe of any among the claim 4-9.

13,, it is characterized in that described equipment is loaded into and constitute portable seamless steel-tube making machine on the flat board of load-carrying vehicle chassis according to the equipment of the production seamless steel pipe of claim 10.

14,, it is characterized in that described equipment is loaded into and constitute portable seamless steel-tube making machine on the flat board of load-carrying vehicle chassis according to the equipment of the production seamless steel pipe of claim 11.

15, according to the equipment of the production seamless steel pipe of any among the claim 4-5, it is characterized in that described inside and outside resistance ring by molybdenum-base alloy, particularly molybdenum-titanium alloy is surfaces nitrided; Perhaps make by silicon nitride and carbon fibre composite.

16,, it is characterized in that described back shaft is driven direction rotation in contrast to described external resistance ring together with set internal resistance ring thereon according to any produces the equipment of seamless steel pipe among the claim 4-8.

17, according to the equipment of the production seamless steel pipe of claim 16, it is characterized in that described external resistance ring by planar end surface circular outer quicken resistance ring (23) and the circular base plate of planar end surface (22) in the middle of clamping at least three dish shapes ring (24) form, their periphery has overcoat (21) fixing; Described dish shape ring is that radius is Υ _OutwardBall be parallel to the dish shape thing that two planes of its central plane intercept, shaft extension (28) is arranged on the biend, stretch into and be formed in the described outer groove that quickens on resistance ring (23) and base plate (22) corresponding end-faces, described dish shape ring can also can move along described groove around the axis rotation that two shaft extension lines form, described outer hole of quickening on the resistance ring other end is a charging aperture, its aperture is not less than the blank external diameter, global constitutes the tubaeform circular arc camber that shrinks from charging aperture to described dish shape, and described circular arc camber circular arc is center of circle Υ with the global heart of dish shape _OutwardFor radius forms, the diameter of global peak inner periphery of living in of dish shape is an outlet spout corresponding to the production tube external diameter; Described base plate internal orifice dimension is not less than the outlet spout internal diameter; Described internal resistance ring has similar in appearance to the structure of above-mentioned external resistance ring, by interior acceleration resistance ring (26) and base plate (27) clamping dish shape ring or at least three dish shape rings (29) add fixing in cover form.

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