CN114210895A - Forming method of integrally forged multi-nozzle of large-scale integrated pipe connecting section - Google Patents
Forming method of integrally forged multi-nozzle of large-scale integrated pipe connecting section Download PDFInfo
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- CN114210895A CN114210895A CN202111210913.2A CN202111210913A CN114210895A CN 114210895 A CN114210895 A CN 114210895A CN 202111210913 A CN202111210913 A CN 202111210913A CN 114210895 A CN114210895 A CN 114210895A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention provides a method for forming a large-scale integrated connecting pipe section integrally-forged multi-pipe nozzle, which comprises the steps of preparing a cylindrical intermediate blank, wherein the outer wall of the intermediate blank is provided with an annular convex shoulder for forming the pipe nozzle; sleeving two annular ring cutters on blanks on two sides of the annular convex shoulder, pushing the ring cutters to move towards the annular convex shoulder, and cutting edges of the ring cutters into the root of the annular convex shoulder; distributing the annular convex shoulders to obtain a plurality of nozzle blanks; pre-forging the nozzle blank by using a pre-forming die to obtain a nozzle intermediate blank; and finally forging the intermediate blank of the nozzle by using a final forming die to obtain the nozzle. The invention can improve the material utilization rate and the forging efficiency, and obtain the nozzle with uniform allowance, complete streamline and excellent performance.
Description
Technical Field
The invention relates to the technical field of integral forging forming of large-scale integrated pipe connecting sections, in particular to a forming method of integral forging multi-pipe nozzles of large-scale integrated pipe connecting sections.
Background
The large-scale integrated pipe connecting section related by the invention is a core component of a nuclear reactor pressure vessel, and the structure of the large-scale integrated pipe connecting section comprises a flange section, a cylinder section and a plurality of overhanging nozzles which are uniformly or non-uniformly distributed on the outer wall of the flange section, as shown in figures 1 and 2, the wall thickness of the flange section is thicker than that of the cylinder section, the outline dimension exceeds phi 5m multiplied by 5m, and the large-scale integrated pipe connecting section belongs to an ultra-large pipe connecting section cylinder. The number of the nozzles distributed in the circumferential direction is multiple, and the nozzles are uniformly distributed when the angles of the central lines of the adjacent nozzles are the same, namely the angle alpha is equal to the angle beta in the graph; when the angles of the central lines of the adjacent nozzles are different, namely the angle alpha is not equal to the angle beta in the graph, the nozzles are in non-uniform distribution. The nozzle is hollow cylinder shape, and the external diameter size is bigger, and length is longer. With the improvement of nuclear safety level, the improved design requires integral forging of the pipe connecting section, and particularly, the nozzle is subjected to profile forging to obtain good fiber flow direction along the length direction of the nozzle, so that the final product can meet strict quality requirements to adapt to severe service environments.
The traditional forging technology adopts a ring belt enveloping mode to forge and form the nozzles, then redundant metal between the nozzles is removed by mechanical processing, and the nozzles are processed to the size of the drawing. The shape of the forged piece obtained by adopting the ring belt enveloping forging mode is relatively simple, the forging forming difficulty is reduced, but the following problems can be caused: firstly, the size specification of a tube body base body of a pipe connecting section without considering a nozzle is overlarge, and the steel ingot used for forging has a huge specification grade. Because the length of the nozzle is long and the diameter is large, the enveloping forging of the ring belt can occupy the whole circle of metal material, so that the grade of the steel ingot can exceed the limit of equipment and the forging cannot be carried out. Secondly, after the annular belt is enveloped and forged, the flow direction of the forging fibers of the nozzle can be cut off in the process of mechanically processing and forming the nozzle, and the mechanical property of the nozzle is not improved. And thirdly, the machining removal amount of the mechanical machining formed pipe nozzle is large, and the machining period is long.
CN105033154A discloses an integral forging method for an integrated pipe joint section with a connecting pipe and a flange, and discloses a die for forging the integrated pipe joint section. The patent prefabricates a hollow blank with a middle ring belt, presses the ring belt of the nozzle by a triangular anvil, prepresses a concave stop, and forms a boss of the nozzle. The section of the boss of the pipe nozzle is rectangular, and the boss is machined into a round shape subsequently. The width of the prefabricated intermediate zone corresponds to the diameter of the nozzle, and the height of the zone corresponds to the height of the nozzle. The fiber flow direction of the boss of the nozzle is in the circumferential direction of the cylinder.
CN110090914A discloses a method for forging and forming a flange joint pipe section of a reactor pressure vessel barrel integrally, and discloses a method for forging a flange joint pipe section barrel with four joint pipes, wherein the gap between two adjacent pipe nozzles is small, and the gap between two far away pipe nozzles is large. According to the method, a solid blank with a middle ring belt is prefabricated, a die is used for distributing materials, a larger gap between pipe nozzles is flattened along the radial direction of the blank, a connecting pipe boss is formed, and finally, the connecting pipe boss is subjected to mechanical finish machining after performance heat treatment to obtain the connecting pipe. The method is suitable for the structure with less nozzles and larger gaps between the nozzles, and is not suitable for the structure with more nozzles and smaller gaps between the nozzles.
CN201810637283 discloses a profiling forging process for an integrated connecting pipe section forging, wherein after a pipe nozzle blank is formed, the pipe nozzle blank is machined into a round shape in a machining mode.
Therefore, in the prior art, the circular connecting pipes are obtained by machining, the removal amount of machining is large, the material utilization rate is low, the machining time is long, only one connecting pipe or two connecting pipes can be machined each time, the efficiency is low, and the design requirement of integral forging forming of the integrated connecting pipe section cannot be met.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for forming a large-scale integrated connecting pipe section integrally-forged multi-nozzle, which can improve the material utilization rate and forging efficiency and obtain a nozzle with uniform allowance, complete streamline and excellent performance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for forming integrally forged multi-nozzle of large-scale integrated pipe connecting section comprises
Preparing a cylindrical intermediate blank, wherein the outer wall of the intermediate blank is provided with an annular convex shoulder for forming a nozzle;
sleeving two annular ring cutters on blanks on two sides of the annular convex shoulder, pushing the ring cutters to move towards the annular convex shoulder, and cutting edges of the ring cutters into the root of the annular convex shoulder;
distributing the annular convex shoulders to obtain a plurality of nozzle blanks;
pre-forging the nozzle blank by using a pre-forming die to obtain a nozzle intermediate blank;
performing finish forging on the intermediate blank of the nozzle by using a finish forming die to obtain the nozzle;
the central through hole of the nozzle is machined.
Further, the pre-forming die is provided with a circular guide central hole, the side face of the pre-forming die is provided with pre-forming cavities, the number of the pre-forming cavities is the same as that of the nozzle blanks, and the position relation among the pre-forming cavities corresponds to that of the nozzle blanks; during pre-forging, two pre-forming dies are sleeved on blanks on two sides of a nozzle blank, each pre-forming cavity is aligned to one nozzle blank, the two pre-forming dies are pushed to move towards the nozzle blank, and the pre-forming cavities extrude the nozzle blank to obtain a nozzle intermediate blank.
Further, the final forming die is provided with a circular guide central hole, the side face of the final forming die is provided with a final forming cavity with a semicircular section, the diameter of the final forming cavity is consistent with the design diameter of the nozzle, the number of the final forming cavities is the same as that of the intermediate blanks of the nozzle, and the position relationship among the final forming cavities corresponds to that of the nozzle; and during final forging, sleeving the two final forming dies on the blanks on two sides of the middle blank of the nozzle, pushing the two final forming dies to move towards the middle blank of the nozzle, and extruding the middle blank of the nozzle by the final forming cavity to obtain the nozzle.
Further, the preforming cavity comprises an arc-shaped groove bottom and an arc-shaped side wall, the radius of the groove bottom is larger than the design radius of the nozzle, the groove bottom is connected with the side wall through an arc surface, the depth of the preforming cavity is larger than or equal to the design radius of the nozzle, and the width of the notch of the preforming cavity is larger than the design diameter of the nozzle.
Furthermore, a plurality of notches are arranged on the cutting edge of the ring cutter, the number of the notches is the same as that of the nozzles, and the positions of the notches correspond to the positions of gaps among the nozzles; when the annular convex shoulder cutting device is used, two circles of cutters are sleeved on blanks on two sides of the annular convex shoulder, notches on the two circles of cutters are aligned with each other, the circles of cutters are pushed to move towards the annular convex shoulder, the cutting edges of the circles of cutters cut into the root part of the annular convex shoulder to form a separation groove, and metal at the notches is reserved and forms a positioning boss relative to the separation groove; when the annular convex shoulder is subjected to material distribution, the material distribution knife is aligned with the positioning boss to cut the annular convex shoulder, and a plurality of nozzle blanks are obtained.
And further, distributing the material to the annular convex shoulder by using a material distributing knife, wherein the section of the material distributing knife is triangular, the material distributing knife is aligned to the annular convex shoulder, the length direction of the material distributing knife is the axial direction of the intermediate blank, and the material distributing knife is pushed to move along the radial direction of the annular convex shoulder to cut the annular convex shoulder.
Further, the height of the annular shoulder is smaller than the design length of the nozzle, and the length is larger than the design diameter of the nozzle.
Furthermore, the section of the cutting edge of the ring cutter comprises a straight surface and an inclined surface, the straight surface and the inclined surface are connected through an arc-shaped transition surface, and after the ring cutter is sleeved on blanks on two sides of the annular convex shoulder, the straight surface of the cutting edge is in sliding fit with the blanks.
Further, the intermediate blank has a central through hole.
Further, the forging temperature for pre-forming and final forming of the nozzle is less than or equal to 1250 ℃.
The invention has the beneficial effects that:
1. during forging, the metal on the two side faces of the nozzle blank flows towards the middle and is gradually circular, the height of the nozzle blank is gradually increased, the metal at the root parts of the two sides of the annular convex shoulder is cut off along the axial direction by utilizing the ring cutter to form an annular separation groove, so that the metal at the root parts of the two sides of the annular convex shoulder is separated from the cylindrical blank, the acting force when the root parts of the two sides of the annular convex shoulder are connected with the cylindrical blank disappears, the resistance of the metal at the root parts of the two sides of the annular convex shoulder towards the direction far away from the cylindrical blank can be greatly reduced, during forging, the materials at the two sides of the annular convex shoulder can be extruded towards the middle in a labor-saving manner, and the forming difficulty of the nozzle is reduced.
2. The metal at the root parts of the two sides of the annular convex shoulder is cut off along the axial direction, so that the forming resistance of the nozzle is reduced, and the forming effect of the nozzle is improved.
3. The forming mode of pre-forging and finish forging is adopted, so that the nozzle is formed step by step, the forming difficulty is reduced, and the forming precision is ensured.
4. The mouthpiece is formed through forging, does not need machining to circular, also need not reserve too much machining allowance, has improved production efficiency, has improved the utilization ratio of material simultaneously, and prevents to cut off the forging fibre flow direction of mouthpiece, has kept the complete of fibre streamline, has guaranteed the mechanical properties of mouthpiece.
5. Can form a plurality of nozzles at one time, and has high production efficiency.
Drawings
FIG. 1 is a schematic view of the structure of the integrated piping barrel and nozzle;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic illustration of a forging blank;
FIG. 4 is a schematic cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of an intermediate billet;
FIG. 6 is a schematic view of a ring cutter;
FIG. 7 is a schematic cross-sectional view of a cutting edge of the ring cutter;
FIG. 8 is a schematic cross-sectional view of a riving knife;
FIG. 9 is a schematic view of a preform mold;
FIG. 10 is a schematic view of a final forming die;
FIG. 11 is a schematic view of the use of a loop knife;
FIG. 12 is a schematic top view of the intermediate blank after the ring cutter has separated the slot;
FIG. 13 is a schematic view of the annular shoulder after separation;
FIG. 14 is a schematic diagram of a preforging;
fig. 15 is a schematic view after finish forging.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention discloses a method for forming a large-scale integrated pipe connecting section integrally forged multi-nozzle, which comprises the following steps:
the shape and the size of the forging blank are determined according to the shape and the size of the part, the design principle is the shape following design, and the forging blank is shown in figures 3 and 4. Considering that the central hole of the nozzle belongs to a small-diameter overlong hole, the manufacturability is poor, the forming is not suitable for forging, and the forming by mechanical processing after forging into a solid nozzle is preferred.
A cylindrical intermediate blank 1 is prepared, the main body of the intermediate blank 1 is a cylindrical blank, as shown in fig. 5, the outer wall of the intermediate blank 1 is provided with an annular shoulder 11 for forming a nozzle, and the cylindrical blank can play a role of guiding in the subsequent processing process. The middle blank 1 is provided with a central through hole, so that the weight of the middle blank 1 can be reduced, the middle blank is more convenient to move, position and reduce the load of equipment, and the middle blank can be used for auxiliary positioning. The height (namely the distance from the circumferential surface to the circumferential surface of the cylindrical blank) of the annular shoulder 11 is less than the design length of the nozzle, the length (namely the distance between two side surfaces) is greater than the design diameter of the nozzle, and the length and the height meet a proper proportional relation, for example, the ratio of the length to the height is less than or equal to 5, if the ratio is too large, the nozzle is seriously concave, even deformed and unstable, and the size requirement of the nozzle cannot be met. The total volume of the annular shoulder 11 is slightly greater than the sum of the volumes of all the nozzles to ensure that there is sufficient material to form each nozzle while reducing material waste.
Two circular ring cutters 2 are sleeved on blanks on two sides of the annular shoulder 11, the structure of each ring cutter 2 is shown in figure 6, the ring cutters 2 are pushed to move towards the annular shoulder 11, cutting edges 21 of the ring cutters 2 cut into the root of the annular shoulder 11, the cutting depth is determined according to the length of the annular shoulder 11 and the design diameter of a nozzle, and separating grooves are formed in the root of two side faces of the annular shoulder 11.
The conventional forging mode is that the annular convex shoulder 11 is directly divided and forged, and because the root parts of the two side surfaces of the annular convex shoulder 11 and the cylindrical blank are connected into a whole, a large binding force exists between the annular convex shoulder and the cylindrical blank, and when the nozzle blank is extruded towards the middle from the two side surfaces during forging, the root parts of the two side surfaces of the nozzle blank can generate large resistance, so that the forming difficulty of the nozzle is increased. According to the invention, the ring cutter 2 is firstly utilized to cut a separation groove at the root parts of the two side surfaces of the annular convex shoulder 11, so that the metal at the root part of the annular convex shoulder 11 is separated from the cylindrical blank, the binding force between the metal at the root part of the annular convex shoulder 11 and the cylindrical blank is eliminated, the metal at the two side surfaces of the annular convex shoulder 11 can rapidly flow towards the middle during forging, the flow resistance is small, the forging difficulty is reduced, and the forging efficiency can be improved. In addition, the material flow of the root parts on the two sides of the annular shoulder 11 does not influence the cylindrical blank during forging, thereby ensuring the dimensional precision and the structure performance of the cylindrical blank.
The main body of the ring cutter 2 is in a circular ring shape, the inner diameter of the main body is slightly larger than the outer diameter of the cylindrical blank, the cutting edge 21 of the ring cutter 2 comprises a straight surface, an inclined surface and two end surfaces, as shown in fig. 7, the straight surface and the inclined surface are connected through an arc-shaped transition fillet R, and after the ring cutter 2 is sleeved on the blanks on two sides of the annular convex shoulder 11, the straight surface of the cutting edge 21 is in sliding fit with the blanks. The included angle A between the transition fillet R and the straight surface and the inclined surface is as small as possible under the condition that the cutting edge meets the strength so as to reduce the shrinkage caused to the billet when cutting off the metal, and the angle A is generally less than or equal to 45 degrees.
And distributing the annular convex shoulder 11 to obtain a plurality of nozzle blanks. The material is divided by a material dividing knife, the material dividing knife can be the existing material dividing knife shown in fig. 8, the section of the material dividing knife is triangular, the material dividing knife is aligned to the annular convex shoulder 11, the length direction of the material dividing knife is the axial direction of the intermediate blank 1, the material dividing knife is pushed to move along the radial direction of the annular convex shoulder 11, and the annular convex shoulder 11 is cut. When the material is distributed, the material distributing knives can be symmetrically cut and distributed by even numbers. After the material distribution, as shown in fig. 13, the annular shoulder 11 can be divided into a plurality of nozzle blanks with the same size, the number of the nozzle blanks is the same as the designed number of the nozzles, dividing grooves are formed between two adjacent nozzle blanks, if the nozzles are uniformly distributed in the circumferential direction, the widths of all the dividing grooves are the same, and if the nozzles are non-uniformly distributed in the circumferential direction, the widths of the dividing grooves correspond to the distance between two adjacent nozzles.
And pre-forging the nozzle blank by using the pre-forming die 3 to obtain a nozzle intermediate blank, and heating the blank to 1250 ℃ before pre-forging. The preforming mold 3 may be in various forms such as a mold for forming 1, 2 or 4 nozzle intermediate blanks at one time, etc., and the preforming cavity 31 may be in an oval shape, etc., as a preferred embodiment: as shown in fig. 9, the preforming tool 3 is annular as a whole and has a circular guiding central hole, and the diameter of the guiding central hole is slightly larger than the outer diameter of the cylindrical blank, so that the preforming tool 3 can be sleeved on the cylindrical blank and can slide along the axial direction of the cylindrical blank. One side of the pre-forming die 3 is provided with pre-forming cavities 31, the number of the pre-forming cavities 31 is the same as that of the nozzle blanks, and the position relationship among the pre-forming cavities 31 corresponds to that of the nozzle blanks, so that all nozzle intermediate blanks can be formed at one time, and the forming efficiency is improved. During pre-forging, the blank is vertically fixed, two pre-forming dies 3 are sleeved on the blank at two sides of the nozzle blank, each pre-forming cavity 31 is aligned with one nozzle blank, as shown in fig. 14, the two pre-forming dies 3 are pushed to move towards the nozzle blank, the two pre-forming cavities 31 extrude the nozzle blank, materials on the upper side and the lower side of the nozzle blank flow towards the direction far away from the cylindrical blank, the section area of the nozzle blank is gradually reduced, the height of the nozzle blank is gradually increased, and the intermediate blank of the nozzle is obtained.
The pre-forming cavity 31 comprises an arc-shaped groove bottom and two arc-shaped side walls, the radius of the groove bottom is larger than the design radius of the nozzle, the groove bottom is connected with the side walls through an arc surface, the depth of the pre-forming cavity 31 is larger than or equal to the design radius of the nozzle, and the width of the notch of the pre-forming cavity 31 is larger than the design diameter of the nozzle. With the preform chamber 31 of such a structure, the nozzle blank can be pressed into a shape similar to an ellipse so as to form the nozzle intermediate blank into a cylindrical shape by finish forging.
And (3) performing finish forging on the intermediate pipe nozzle blank by using a finish forming die 4 to obtain the pipe nozzle, and heating the blank to 1250 ℃ before finish forging. The final forming die 4 can be in various forms, such as a die for forming 1, 2 or 4 nozzles at one time, etc., as a preferred embodiment: as shown in fig. 10, the final-forming die 4 has a circular guiding central hole, the diameter of which is slightly larger than the outer diameter of the cylindrical blank, so that the final-forming die 4 can be sleeved on the cylindrical blank and axially slide along the cylindrical blank. A side surface of the final forming die 4 is provided with a final forming cavity 41 with a semicircular section, the diameter of the final forming cavity 41 is consistent with the design diameter of the nozzle, the axial length of the final forming cavity 41 is larger than the design height of the nozzle, the number of the final forming cavities 41 is the same as the number of the intermediate blanks of the nozzle, and the position relationship between the final forming cavities 41 corresponds to the position relationship of the nozzle, so that all the nozzles can be formed at one time, the forming efficiency is improved, and the angle precision of the nozzle is ensured. During finish forging, the blank is vertically fixed, the two finish forming dies 4 are sleeved on the blank on two sides of the middle blank of the nozzle, the two finish forming dies 4 are pushed to move towards the middle blank of the nozzle, and the finish forming cavity 41 extrudes the middle blank of the nozzle to obtain the cylindrical nozzle. Under the constraint condition of the final forming die 4, the angle of the nozzle naturally meets the requirement of a finished product, and the angle is accurate.
After the nozzle is fully formed, the central through hole of the nozzle is machined as shown in fig. 15.
In the above process, the ring knife 2 includes a circular ring-shaped main body, and the cutting edge 21 is provided on one end face of the main body, as shown in fig. 6.
When the annular shoulder 11 is divided, in order to ensure that the size of each obtained nozzle blank is consistent, the dividing position needs to be accurately determined, in the prior art, the dividing position is determined by measurement, and due to the fact that the blank size and the weight are large, the method is troublesome to operate, low in efficiency and has measurement errors, the size of the nozzle blank is difficult to keep consistent, and the final nozzle forming precision is possibly influenced. In order to solve the problem, the cutting edge 21 of the circular knife 2 of the invention is provided with a plurality of notches 22, the notches 22 can be circular notches, the number of the notches 22 is the same as that of the nozzles, and the positions of the notches 22 correspond to the positions of gaps among the nozzles. When the annular convex shoulder 11 is used, the two circles of cutters 2 are sleeved on blanks on two sides of the annular convex shoulder 11, notches 22 on the two circles of cutters 2 are aligned with each other, the circles of cutters 2 are pushed to move towards the annular convex shoulder 11, the cutting edges 21 of the circles of cutters 2 cut into the root part of the annular convex shoulder 11 to form a separation groove, but metal at the notches 22 is reserved and forms a positioning boss 23 relative to the separation groove, as shown in fig. 12; when the annular convex shoulder 11 is divided, the dividing knife is aligned with the positioning boss 23 to cut the annular convex shoulder 11, and a plurality of nozzle blanks are obtained.
Because the weight and the volume of the ring cutter 2 are very small relative to the blank, a plurality of notches 22 can be conveniently machined on the cutting edge 21, the position precision and the size precision of the notches 22 can be ensured, the positioning bosses 23 formed at the notches 22 can be used as the positioning reference of the material distributing cutter, and when the material distributing cutter is used, the material distributing position can be ensured to be accurate only by aligning the material distributing cutter to the positioning bosses 23. Compared with the prior art, the invention ensures the accuracy of the material distribution position, and because the structure (the gap 22) for forming the positioning datum (the positioning boss 23) is arranged on the cutting edge 21 of the ring cutter 2, the positioning datum is automatically formed when the ring cutter 2 cuts the root of the annular convex shoulder 11, no additional processing step is needed, the production process is kept simple, and the production efficiency is not influenced.
The invention adopts the forming mode of pre-forging and finish forging to gradually form the nozzle, thereby reducing the forming difficulty and ensuring the forming precision. The mouthpiece is formed through forging, does not need machining to circular, also need not reserve too much machining allowance, has improved production efficiency, has improved the utilization ratio of material simultaneously, and prevents to cut off the forging fibre flow direction of mouthpiece, has kept the complete of fibre streamline, has guaranteed the mechanical properties of mouthpiece. In addition, a plurality of nozzles can be formed at one time, and the production efficiency is high.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The forming method of the integrally forged multi-nozzle of the large-scale integrated pipe connecting section is characterized by comprising the following steps
Preparing a cylindrical intermediate blank (1), wherein the outer wall of the intermediate blank (1) is provided with an annular convex shoulder (11) for forming a nozzle;
sleeving two circular ring cutters (2) on blanks on two sides of the annular convex shoulder (11), pushing the ring cutters (2) to move towards the annular convex shoulder (11), and cutting edges (21) of the ring cutters (2) into the root of the annular convex shoulder (11);
distributing the annular convex shoulders (11) to obtain a plurality of nozzle blanks;
pre-forging the nozzle blank by using a pre-forming die (3) to obtain a nozzle intermediate blank;
performing finish forging on the intermediate blank of the pipe nozzle by using a finish forming die (4) to obtain the pipe nozzle;
the central through hole of the nozzle is machined.
2. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein:
the preforming mold (3) is provided with a circular guiding central hole, the side surface of the preforming mold is provided with preforming cavities (31), the number of the preforming cavities (31) is the same as that of the nozzle blanks, and the position relationship among the preforming cavities (31) corresponds to that of the nozzle blanks; during pre-forging, two pre-forming dies (3) are sleeved on blanks on two sides of a nozzle blank, each pre-forming cavity (31) is aligned to one nozzle blank, the two pre-forming dies (3) are pushed to move towards the nozzle blank, and the nozzle blank is extruded by the pre-forming cavities (31) to obtain a nozzle intermediate blank.
3. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: the final forming die (4) is provided with a circular guide central hole, the side surface of the final forming die is provided with a final forming cavity (41) with a semicircular section, the diameter of the final forming cavity (41) is consistent with the design diameter of the nozzle, the number of the final forming cavities (41) is the same as that of the intermediate blanks of the nozzle, and the position relationship between the final forming cavities (41) corresponds to that of the nozzle; during finish forging, the two finish forming dies (4) are sleeved on the blanks on two sides of the middle blank of the nozzle, the two finish forming dies (4) are pushed to move towards the middle blank of the nozzle, and the middle blank of the nozzle is extruded by the finish forming cavity (41) to obtain the nozzle.
4. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 2, wherein: the pre-forming cavity (31) comprises an arc-shaped groove bottom and an arc-shaped side wall, the radius of the groove bottom is larger than the design radius of the nozzle, the groove bottom is connected with the side wall through an arc surface, the depth of the pre-forming cavity (31) is larger than or equal to the design radius of the nozzle, and the width of a groove opening of the pre-forming cavity (31) is larger than the design diameter of the nozzle.
5. The method for forming a large-scale integral connecting pipe section monobloc forging multi-nozzle as claimed in claim 1, 2, 3 or 4, wherein: a plurality of notches (22) are formed in the cutting edge (21) of the ring cutter (2), the number of the notches (22) is the same as that of the nozzles, and the positions of the notches (22) correspond to the positions of gaps among the nozzles; when the cutting device is used, two circles of cutters (2) are sleeved on blanks on two sides of an annular convex shoulder (11), notches (22) on the two circles of cutters (2) are aligned with each other, the circles of cutters (2) are pushed to move towards the annular convex shoulder (11), cutting edges (21) of the circles of cutters (2) cut into the root of the annular convex shoulder (11) to form a separation groove, and metal at the notches (22) is reserved and forms a positioning boss (23) relative to the separation groove; when the annular convex shoulder (11) is divided, the dividing knife is aligned with the positioning boss (23) to cut the annular convex shoulder (11) to obtain a plurality of nozzle blanks.
6. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: and (3) distributing the annular convex shoulder (11) by adopting a distributing knife, wherein the section of the distributing knife is triangular, the distributing knife is aligned to the annular convex shoulder (11), the length direction of the distributing knife is the axial direction of the intermediate blank (1), and the distributing knife is pushed to move along the radial direction of the annular convex shoulder (11) to cut the annular convex shoulder (11).
7. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: the height of the annular shoulder (11) is less than the design length of the nozzle, and the length is greater than the design diameter of the nozzle.
8. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: the cutting edge (21) of the ring cutter (2) comprises a straight surface and an inclined surface, the straight surface and the inclined surface are connected through an arc-shaped transition surface, and after the ring cutter (2) is sleeved on blanks on two sides of the annular convex shoulder (11), the straight surface of the cutting edge (21) is in sliding fit with the blanks.
9. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: the intermediate blank (1) has a central through hole.
10. The method for forming the integrally forged multi-nozzle of the large-scale integrated pipe connecting section according to claim 1, wherein: the forging temperature of the pipe nozzle pre-forming and final forming is less than or equal to 1250 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111210913.2A CN114210895B (en) | 2021-10-18 | 2021-10-18 | Forming method of integrally forged multi-nozzle of large-scale integrated pipe connecting section |
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| CN102459513A (en) * | 2009-05-04 | 2012-05-16 | 福斯管理公司 | Improved nozzles for a fluid jet decoking tool |
| CN103537509A (en) * | 2013-10-29 | 2014-01-29 | 北京科技大学 | Large-sized multi-nozzle pipe hot extrusion forming process formulation and mold design method |
| CN103567341A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Forging method for CAP1400 nuclear power pressure vessel pipe connecting section |
| CN110090914A (en) * | 2019-04-23 | 2019-08-06 | 上海新闵（东台）重型锻造有限公司 | Reactor pressure vessel shell flange nozzle belt solid forging shaping method |
| CN110125315A (en) * | 2019-05-23 | 2019-08-16 | 二重（德阳）重型装备有限公司 | The forging forming method of main pipeline pipe with asymmetric ozzle |
| CN112756528A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Straight gear forming method and device |
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| CN102459513A (en) * | 2009-05-04 | 2012-05-16 | 福斯管理公司 | Improved nozzles for a fluid jet decoking tool |
| CN103567341A (en) * | 2012-08-07 | 2014-02-12 | 上海重型机器厂有限公司 | Forging method for CAP1400 nuclear power pressure vessel pipe connecting section |
| CN103537509A (en) * | 2013-10-29 | 2014-01-29 | 北京科技大学 | Large-sized multi-nozzle pipe hot extrusion forming process formulation and mold design method |
| CN110090914A (en) * | 2019-04-23 | 2019-08-06 | 上海新闵（东台）重型锻造有限公司 | Reactor pressure vessel shell flange nozzle belt solid forging shaping method |
| CN110125315A (en) * | 2019-05-23 | 2019-08-16 | 二重（德阳）重型装备有限公司 | The forging forming method of main pipeline pipe with asymmetric ozzle |
| CN112756528A (en) * | 2020-12-18 | 2021-05-07 | 南京工程学院 | Straight gear forming method and device |
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