CN122425132A - High-precision diameter-expanding cone and deep-sea pipe forming equipment - Google Patents

Abstract

This invention provides a high-precision expanding cone and deep-sea pipe forming equipment. The expanding cone has a ring of V-grooves arranged in a circumferential array along its outer periphery. The bottom of the expanding module is provided with a V-shaped surface that is adapted to fit and slidably connected to the V-grooves. The V-shaped surface structure design of this application can effectively increase the contact area of the cone surface, reduce the unit pressure and heat generation caused by friction, avoid reducing the force-bearing area and cone strength of the cone due to the opening of T-slots, and improve the coaxiality of the mold movement by using the self-centering characteristic of the V-shaped surface, increase the contact area, reduce the unit pressure, reduce frictional heat generation, increase the load-bearing capacity, and improve the axial guiding accuracy.

Description

High-precision diameter-expanding cone and deep-sea pipe forming equipment

Technical Field

The invention relates to the technical field of steel pipe forming, in particular to high-precision diameter-expanding cone and deep-sea pipe forming equipment.

Background

At present, in the fields of deep sea oil gas transportation, ocean engineering and the like, the requirements for high-strength, small-caliber and large-wall-thickness steel pipes are increasing. The pipe forming equipment is a core tool in the steel pipe expanding process, and the performance of the pipe forming equipment directly determines the dimensional accuracy of the steel pipe and the quality of a finished product. However, the existing pipe forming equipment (for example, patent number CN120169904A, CN110153299 a) adopts a T-shaped groove and a T-shaped key to match and slide between the cone and the diameter-expanding module, and when coping with the production of such special specification steel pipes, the following technical defects exist, which are specifically expressed as follows:

The contact surface adopts T type keyway to lead to effective bearing area to be little, and fish tail and wearing and tearing problem appear easily to T type key and screw appear spiral fracture scheduling problem, appear mould and cone locking's condition occasionally, and the unbalance loading leads to the size uniformity poor when expanding, and the pressure that the cone bore when expanding the thick wall pipe is big, and the heating amount is high, and the heat dissipation is slow, and lubricating oil viscosity can reduce under the high temperature, lubrication failure problem.

In summary, when the existing expanding head assembly is applied to the expanding process of the high-strength, small-caliber and large-wall-thickness steel pipes, the existing expanding head assembly has the technical defects of insufficient structural rigidity, concentrated local stress, poor heat dissipation conditions, weak strength of key connecting pieces and the like, causes frequent faults such as scratches, fracture and locking, and is difficult to meet the large-scale production requirements of high efficiency, high precision and low defect rate. Therefore, there is a need to develop a new expanded cone structure that can accommodate such severe conditions.

Disclosure of Invention

The invention aims to solve the problems of insufficient structural rigidity, concentrated local stress and poor heat dissipation conditions of the existing diameter-expanding cone, and provides high-precision diameter-expanding cone and deep-sea pipe forming equipment.

In order to solve the problems, the invention provides the following technical scheme:

A high-precision diameter-expanding cone comprises a connecting section, a conical surface section and a guiding section which are sequentially arranged from front to back;

The outer diameter of the conical surface section gradually reduces from front to back, a circle of V-shaped grooves are distributed on the periphery of the conical surface section along the circumferential array of the conical surface section, and the V-shaped grooves are in sliding fit with the diameter expanding modules on the outer sides of the V-shaped grooves;

The middle part of the high-precision diameter-expanding cone is penetrated with a through hole for penetrating the piston rod, the connecting section is fixedly connected with the end part of the piston rod, and the guide section is used for guiding the guide section to axially slide along the guide module.

The high-precision expanding cone is characterized in that the length of the guide section is not less than one third of the whole length of the conical surface section.

According to the high-precision diameter-expanding cone, the grooving angle of the V-shaped groove is 90-150 degrees.

The high-precision expanding cone is characterized in that 12V-shaped grooves are distributed on the periphery of the cone section along the circumferential array of the cone section.

A high precision diameter-enlarging cone as described above, wherein the surface hardness of the conical surface section is greater than the core hardness.

According to the high-precision diameter-expanding cone, the surface hardness of the conical surface section is HRC 58-62, and the core hardness is HRC 35-40.

The high-precision diameter-expanding cone is made of 30CrNiMo8, 42CrMo or GCr15.

The high-precision diameter expansion cone comprises a plurality of groups of diameter expansion assemblies which are correspondingly matched with the V-shaped grooves in a sliding mode, wherein the diameter expansion assemblies comprise modules, wedges and sliding blocks which are sequentially arranged in a stacked mode, and one side, away from the wedges, of each sliding block is a V-shaped surface which is matched with the V-shaped grooves in a fitting mode and is in sliding connection.

The high-precision diameter-expanding cone comprises the front guide ring and the rear guide ring, wherein the diameter-expanding module is arranged between the front guide ring and the rear guide ring, and the connecting section and the guide section are respectively in sliding connection with the front guide ring and the rear guide ring.

The application further aims to provide deep sea pipe forming equipment, which comprises a guide module, a diameter expanding module and the high-precision diameter expanding cone, wherein the high-precision diameter expanding cone is arranged in the middle of the guide module in a penetrating manner and can axially slide along the guide module, the diameter expanding module comprises a plurality of groups of diameter expanding assemblies which are correspondingly matched with the V-shaped grooves in a sliding manner, and the plurality of groups of diameter expanding assemblies are arranged on the periphery of the conical surface section in a surrounding manner.

Compared with the prior art, the invention has the following advantages:

The application provides a high-precision diameter-expanding cone and deep sea pipe forming equipment, wherein a circle of V-shaped grooves are distributed on the periphery of the diameter-expanding cone in an array manner along the circumferential direction of the diameter-expanding cone, and V-shaped surfaces which are matched with the V-shaped grooves in a sliding connection mode are arranged at the bottom of a diameter-expanding module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a partially exploded schematic illustration of a tube forming apparatus in accordance with an embodiment of the invention;

FIG. 2 is a rear view of a tube forming apparatus in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is a side view of tubing forming apparatus in an embodiment of the invention;

FIG. 5 is a schematic cross-sectional view in the direction B-B of FIG. 4;

FIG. 6 is a schematic view of an enlarged cone according to an embodiment of the present invention;

FIG. 7 is a schematic view of an expanding assembly according to an embodiment of the present invention;

FIG. 8 is an internal schematic view of an expanding assembly according to an embodiment of the present invention;

Wherein, the corresponding numbers of the reference numerals are as follows:

The guide module 1, the front guide ring 11, the rear guide ring 12, the first oil supply joint 121, the second oil supply joint 122, the third oil supply joint 123, the first oil supply passage 124, the second oil supply passage 125, the third oil supply passage 126, the head holder 13, the lubricating oil head 14, the front guide structure 15, the t-shaped clamping portion 151, the bayonet 152, the rear guide structure 16, the t-shaped guide groove 161, the t-shaped guide key 162, the front pressing structure 17, the front leaf spring 171, the rear pressing structure 18, the rear leaf spring 181, the diameter expanding cone 2, the through hole 20, the cone section 21, the v-shaped groove 210, the connecting section 22, the guide section 23, the diameter expanding module 3, the diameter expanding assembly 30, the slider 31, the v-shaped surface 310, the first lubricating oil outlet 311, the wedge 32, the first lubricating oil inlet 321, the first main oil passage 322, the first branch oil passage 323, the second lubricating oil inlet 324, the second lubricating oil outlet 325, the second main oil passage 326, the second branch 327, the module 33, the u-shaped bar 34.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

Referring to fig. 1-8, an embodiment of the present application provides a pipe forming apparatus, which includes a guide module 1, an expanding cone 2 and an expanding module 3, wherein the expanding cone 2 is penetrated in the middle of the guide module 1 and can slide along the axial direction of the guide module, the expanding module 3 includes a plurality of groups of expanding assemblies 30 corresponding to the expanding cone 2 in sliding fit, the plurality of groups of expanding assemblies 30 are enclosed on the periphery of the expanding cone 2, a through hole 20 for penetrating a piston rod (not shown) is penetrated in the middle of the expanding cone 2, the piston rod drives the expanding cone 2 to move along the axial direction on the guide module 1, and the expanding cone 2 drives the expanding module 3 connected with the expanding cone in sliding manner to expand the pipe radially outwards along the guide module 1.

The expanding cone 2 of the embodiment of the application comprises a cone section 21 with the outer diameter gradually reduced from front to back, as a main improvement point of the application, a circle of V-shaped grooves 210 are distributed on the periphery of the cone section 21 along the circumferential array of the cone section, a V-shaped surface 310 which is fit with the V-shaped grooves 210 and is in sliding connection is arranged at the bottom of the expanding assembly 30, the cone is prolonged by adopting the V-shaped grooves 210, the reduction of the cone strength and the reduction of the sliding contact surface caused by opening a T-shaped guide key groove on the cone in the prior art are reduced, the contact area of the cone can be effectively increased by adopting the structural design of the V-shaped surface 310, the unit pressure and the heat caused by friction are reduced, the cone stress area is prevented from being reduced due to opening the T-shaped key groove, the bearing capacity is increased, and the axial guide precision is improved.

The expanding module 3 of the embodiment of the application comprises a plurality of groups of expanding assemblies 30 which are correspondingly matched with the V-shaped grooves 210 in a sliding manner, specifically, the expanding assemblies 30 comprise modules 33, wedges 32 and sliding blocks 31 which are sequentially stacked, one side of each sliding block 31 away from each wedge 32 is a V-shaped surface 310 which is matched with the V-shaped groove 210 in a sliding manner, the sliding blocks 31 on the bottom surface of each wedge 32 are of an inverse V-shaped structure, are matched and contacted with the V-shaped grooves 210 of the expanding cone 2, so that the effective contact area can be increased, the stress distribution can be improved, the local stress concentration can be reduced, the locking of the die can be prevented, and meanwhile, the friction heating is reduced.

Preferably, the sliding block 31 is a copper sliding plate embedded at the bottom of the wedge block 32, and the copper sliding plate can be replaced by other self-lubricating materials (such as a graphite copper sleeve).

Aiming at the prior cone structure contact surface form, a T-shaped key groove is adopted, and the key groove is arranged, so that the effective bearing area is small, while the cone structure adopts a V-shaped surface 310, and the effective bearing area is increased by 30% -40% due to no key groove. In the embodiment of the present application, the grooving angle of the V-shaped groove 210 is 90 ° to 150 °, more preferably 120 °, and the diameter-enlarging cone 2 adopts a V-shaped contact surface, so that the bearing area of the cone is reduced due to the opening of the T-shaped key groove, the bearing capacity is increased, and the bearing capacity is increased by about 30% -40%, which is more suitable for diameter-enlarging shaping of small-caliber large-wall-thickness steel pipes, and in the embodiment, 12V-shaped grooves 210 are distributed on the periphery of the cone section 21 along the circumferential array thereof. The cone bearing capacity is improved, the contact area of the V-shaped surface 310 is increased, the unit pressure is reduced by about 35%, the V-shaped surface 310 has self-centering property, the coaxiality of the movement of the mould is improved, the contact area is increased, the unit pressure is reduced, and friction heating is reduced.

The guide module 1 of the embodiment of the application comprises a front guide ring 11 and a rear guide ring 12 which are arranged at intervals, the diameter expanding module 3 is arranged between the front guide ring 11 and the rear guide ring 12, the diameter expanding cone 2 comprises a connecting section 22, a conical surface section 21 and a guide section 23 which are sequentially arranged from front to back, the connecting section 22 and the guide section 23 at the front end and the rear end of the diameter expanding cone 2 are respectively and slidably connected with the front guide ring 11 and the rear guide ring 12, the connecting section 22 is fixedly connected with the end part of a piston rod (not shown), the guide section 23 is attached to the inner wall of the rear guide ring 12 and slidably connected with the inner wall of the guide ring 12, and the guide section 23 is used for guiding the axial sliding of the guide module 1.

Further preferably, the length of the guiding section 23 is not less than one third of the whole length of the conical surface section 21, the guiding mode of the existing cone structure is only based on the conical surface, and the guiding mode of the application is that the tail guiding section 23 is matched with the rear guiding ring 12, the design further provides axial guiding, so that the eccentric load of the cone is prevented, the stability of the diameter expanding process is improved, the uniformity of the dimension is ensured, the lateral force of the conical surface can be shared, and the abrasion of the conical surface is reduced.

As a further preferable embodiment of the application, the conical surface of the cone adopts a gradient hardness design, the hardness is distributed in a gradient way along the radial direction, the surface hardness of the conical surface section 21 is larger than the core hardness, preferably, the surface hardness of the conical surface section 21 is HRC 58-62, the core hardness is HRC 35-40, the surface is high in hardness and good in wear resistance, the core is high in toughness and strong in impact resistance, the service life is prolonged, and the method is suitable for impact load during expanding of a large-wall-thickness steel pipe. Further preferably, the material of the diameter-enlarging cone 2 is 30CrNiMo8, 42CrMo or GCr15.

The cone structure is provided with a lubricating oil hole for weakening strength, the cone structure is not provided with the lubricating oil hole, independent external oil supply is adopted, the cone is not provided with the lubricating oil hole, the wedge block 32 is provided with a first lubricating oil inlet 321, the V-shaped surface 310 is provided with a first lubricating oil outlet 311 communicated with the first lubricating oil inlet 321, and the lubricating oil hole lubricates the contact surface of the expanding cone 2 and the expanding assembly 30 through a first oil supply path 124 and the wedge block 32 with the first lubricating oil outlet 311. The sliding block 31 at the bottom of the wedge block 32 adopts an inverse V-shaped structure, is matched with the expanding cone 2 by adopting a V-shaped contact surface, effectively increases the cone contact surface, adopts a fully independent lubrication oil way, ensures 100% lubrication of the cone surface, avoids weakening cone strength due to the opening of an oil hole and lubrication failure caused by the blocking of the oil hole, can realize forced lubrication, adapts to a high Wen Gaozai working condition, avoids lubrication failure at high temperature, is suitable for the production of high-steel-grade large-wall-thickness steel pipes, improves the lubrication effect, evenly lubricates the contact surface between the V-shaped groove 210 and the V-shaped surface 310, and reduces the scratch rate to 0.

As a preferred embodiment of the present application, the first lubricant inlet 321 on each wedge 32 is independently supplied with lubricant through the corresponding first lubricant supply channel 124, in this particular embodiment of the present application, the rear end of the guide module 1 is provided with a plurality of first lubricant supply connectors 121 which are respectively and correspondingly communicated with the plurality of first lubricant supply channels 124 for supplying lubricant, and each expanding assembly 30 adopts independent external lubricant supply, so that even if one of the first lubricant supply channels 124 is blocked or fails, the integral lubrication function of the expanding assembly is not affected, and 100% lubrication of the conical surface is ensured, thereby being suitable for the production of high-grade large-wall-thickness steel pipes.

Specifically, the inclined surfaces on both sides of the V-shaped surface 310 are respectively provided with a plurality of first lubricant outlet holes 311, a first main oil passage 322 communicated with the first lubricant inlet holes 321 is arranged in the wedge block 32, and a first branch oil passage 323 is respectively arranged between the first main oil passage 322 and the plurality of first lubricant outlet holes 311. The expanding cone 2 is not provided with the lubricating oil hole, lubricating oil enters the first main oil way 322 arranged in the wedge block 32 through the independent first oil supply way 124, and is conveyed to the first lubricating oil outlet hole 311 through the first branch oil way 323 to fill the contact surface of the expanding cone 2 and the copper sliding block 31, so that 100% uniform lubrication of the conical surface is realized, lubrication failure at high temperature is avoided, and the lubricating oil is suitable for production of high-steel-grade large-wall-thickness steel pipes.

In a specific embodiment, a guide structure is disposed between the diameter expanding assembly 30 and the guide module 1, a plurality of groups of diameter expanding assemblies 30 are respectively disposed on the periphery of the conical surface section 21 through the guide structure, the guide structure is used for guiding the diameter expanding assembly 30 to radially move towards the guide module 1, and further, a compressing structure is further disposed between the diameter expanding assembly 30 and the guide module 1, and the compressing structure is used for elastically compressing the diameter expanding assembly 30 on the V-shaped groove 210. The bidirectional guiding expanding head solves the key technical bottlenecks of large local forming load, concentrated local cone bearing and poor size consistency caused by the problem of pipe type at present, and realizes high efficiency, high precision and low defect rate of expanding the steel pipe.

Specifically, the guide structure comprises a front guide structure 15 arranged between the front side of the wedge block 32 and the rear side of the front guide ring 11 and used for guiding the front side of the wedge block 32 to radially move towards the front guide ring 11, and a rear guide structure 16 arranged between the rear side of the wedge block 32 and the front side of the rear guide ring 12 and used for guiding the rear side of the wedge block 32 to radially move towards the rear guide ring 12, wherein the pressing structure comprises a front pressing structure 17 arranged between the front side of the wedge block 32 and the rear side of the front guide ring 11 and used for elastically pressing the front side of the wedge block 32 on the V-shaped groove 210, and a rear pressing structure 18 arranged between the rear side of the wedge block 32 and the front side of the rear guide ring 12 and used for elastically pressing the rear side of the wedge block 32 on the V-shaped groove 210.

The rear guide structure 16 comprises a T-shaped guide groove 161 which is formed in the front side of the rear guide ring 12 along the radial direction of the rear guide ring 12, and a T-shaped guide key 162 which is arranged at the rear end of the wedge block 32 and is in sliding connection with the T-shaped guide groove 161, the rear pressing structure 18 comprises a plurality of rear plate springs 181 which are stacked, the rear ends of the plurality of rear plate springs 181 are fixed on the rear guide ring 12 through plate spring pressing plates, the lengths of the plurality of rear plate springs 181 are sequentially reduced from bottom to top, and the front end of the rear plate spring 181 at the lowest layer is pressed on the T-shaped guide key 162. The guide mode adopts the T-shaped key plus plate spring pressing plate for guide, so that the guide performance is better when the die reciprocates, and the overall unbalanced load resistance of the expanding head is improved. The plate spring pressing plate can be replaced by a disc spring or a spiral spring.

Specifically, the front pressing structure 17 comprises a front plate spring 171, wherein the front end of the front plate spring 171 is fixed on the front guide ring 11, the rear end of the front plate spring 171 is pressed on the front end of the wedge block 32, and the front guide structure 15 comprises a T-shaped clamping part 151 arranged on the rear end of the front plate spring 171 and two clamping pins 152 arranged on the front end of the wedge block 32 and respectively clamped on two sides of the T-shaped clamping part 151.

In the embodiment of the application, the guiding structure comprises a T-shaped guiding groove 161 which is arranged on the guiding module 1 along the radial direction of the guiding module 1, and a T-shaped guiding key 162 which is arranged on the wedge block 32 and is connected with the T-shaped guiding groove 161 in a sliding way, wherein a second lubricating oil inlet 324 is arranged on the wedge block 32, and a second lubricating oil outlet 325 which is communicated with the second lubricating oil inlet 324 is arranged on the contact surface of the T-shaped guiding key 162 and the T-shaped guiding groove 161.

Specifically, the contact surfaces of the two sides and the rear end of the T-shaped guide key 162 and the T-shaped guide groove 161 are respectively provided with a plurality of second lubricant outlet holes 325, the wedge 32 is internally provided with a second main oil passage 326 communicated with the second lubricant inlet holes 324, and second branch oil passages 327 are respectively arranged between the second main oil passage 326 and the plurality of second lubricant outlet holes 325. Specifically, the second lubricant inlet holes 324 on each wedge 32 are independently supplied with oil through the corresponding second oil supply paths 125, and the rear end of the guide module 1 is provided with a plurality of second oil supply joints 122 which are respectively communicated with the second oil supply paths 125 for supplying oil.

Further preferably, the inner wall lubrication assembly comprises a nozzle bracket 13 arranged at the front side of the guide module 1, a lubricating oil nozzle 14 arranged on the nozzle bracket 13, and a third oil supply path 126 communicated with the lubricating oil nozzle 14, wherein a third oil supply joint 123 communicated with the third oil supply path 126 for supplying oil is arranged at the rear end of the guide module 1. The lubricating oil can be uniformly sprayed to the inner wall of the pipe to be formed, which is advantageous in reducing friction between the module 33 and the pipe to be formed.

As a further limitation of the application, a U-shaped dust strip 34 is installed at the gap between two adjacent wedges 32, and two ends of the top of the U-shaped dust strip 34 are extended with bending structures, and the bending structures are clamped into the top of the wedges 32. In the use process of the expanding head, foreign matters cannot fall between the expanding cone 2 and the wedge block 32, so that the cleaning is convenient, and the working efficiency is improved.

While the foregoing is directed to the preferred embodiments of the present invention, it should be noted that modifications and variations could be made by those skilled in the art without departing from the principles of the present invention, and such modifications and variations are to be regarded as being within the scope of the invention.

Claims (10)

1. A high-precision expanded-diameter cone, characterized in that it comprises a connecting section, a conical surface section, and a guide section arranged sequentially from front to back; The outer diameter of the conical section gradually decreases from front to back, and a ring of V-shaped grooves is distributed around the outer periphery of the conical section in a circumferential array. The V-shaped grooves slide in conjunction with the diameter expansion module on its outer side. The high-precision expanded-diameter cone has a through hole in the middle for a piston rod to pass through. The connecting section is fixedly connected to the end of the piston rod, and the guide section is used to guide it to slide along the axial direction of the guide module. 2. The high-precision expanded diameter cone according to claim 1, characterized in that: the length of the guide section is not less than one-third of the overall length of the cone surface section. 3. The high-precision expanded diameter cone according to claim 1, characterized in that: the slotting angle of the V-groove is 90°～150°. 4. A high-precision expanded-diameter cone according to claim 3, characterized in that: 12 V-shaped grooves are arranged in a circumferential array along the outer periphery of the cone section. 5. A high-precision expanded-diameter cone according to claim 1, characterized in that: the surface hardness of the cone section is greater than the core hardness. 6. A high-precision expanded-diameter cone according to claim 5, characterized in that: the surface hardness of the cone section is HRC58～62, and the core hardness is HRC35～40. 7. A high-precision expanded-diameter cone according to claim 1, characterized in that: the material of the expanded-diameter cone is 30CrNiMo8, 42CrMo or GCr15. 8. A high-precision expanded cone according to claim 1, characterized in that: the expanded diameter module includes multiple sets of expanded diameter components that slide and engage with the V-groove, the expanded diameter component includes a module, a wedge and a slider arranged in sequence, the side of the slider away from the wedge is a V-shaped surface that is adapted to fit and slides with the V-groove. 9. A high-precision expanded diameter cone according to claim 1, characterized in that: the guide module includes a front guide ring and a rear guide ring, the expanded diameter module is disposed between the front guide ring and the rear guide ring, and the connecting section and the guide section are slidably connected to the front guide ring and the rear guide ring respectively. 10. A deep-sea pipe forming equipment, characterized in that: it includes a guide module, an expansion module, and a high-precision expansion cone as described in any one of claims 1-9, wherein the high-precision expansion cone passes through the middle of the guide module and can slide along its axial direction, and the expansion module includes multiple sets of expansion components that slide in accordance with the V-groove, and the multiple sets of expansion components surround the outer periphery of the conical section.