CN111112526A - Manufacturing method of IN718 alloy axial asymmetric multi-flange casing ring piece - Google Patents
Manufacturing method of IN718 alloy axial asymmetric multi-flange casing ring piece Download PDFInfo
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- CN111112526A CN111112526A CN201911251731.2A CN201911251731A CN111112526A CN 111112526 A CN111112526 A CN 111112526A CN 201911251731 A CN201911251731 A CN 201911251731A CN 111112526 A CN111112526 A CN 111112526A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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Abstract
The invention discloses a method for manufacturing an IN718 alloy axial asymmetric multi-flange casing ring piece, which is used for preparing a special-shaped tapered casing ring piece by rolling after a special-shaped blank is formed IN a die. The near-net forming technology is adopted, the forged piece is more attached to the molded surface of the final part, the material utilization rate is improved, and the processing period is shortened; the method has the advantages that the volume distribution of the forged piece is distributed in advance by adopting a special-shaped pre-rolling method, the operation steps of a forming process of a forming die are reduced, the number of dies is reduced, the forging time is more controllable, the performance of the forged piece is ensured, the intermediate blank of the casing ring piece with reasonable volume distribution can be prepared by only using one inner die and one outer die, the forged piece can be smoothly released from the dies, and the tooling material is saved.
Description
Technical Field
The invention belongs to the technical field of forging preparation, and particularly relates to a method for manufacturing an IN718 alloy axial asymmetric multi-flange casing ring piece.
Background
At present, a high-temperature alloy or titanium alloy material is generally adopted for a cartridge receiver type forging piece for an aeroengine, the material cost is high, the utilization rate of the rectangular forging piece material is low, and the near-net forming technology is widely applied. The IN718 alloy is a difficult-to-deform alloy, has poor material flowability and large deformation resistance, and puts higher requirements on the forming process of the casing. The weight of the forged piece designed by the near-net forming technology is 178kg, the weight of the rectangular forged piece is 626kg, 448kg of materials are saved, the material utilization rate is greatly improved, the cost is reduced, and the processing period is shortened. However, the forging has larger inclination, large diameter change of the large end and the small end, complex profile (belonging to S3 group according to JB/T10478 with the complex coefficient S of 0.28 (S3 is less than 0.35)), a plurality of flanges on the inner diameter and the outer diameter, high height, thin wall thickness and large height-thickness ratio. When the type of casing ring forging is rolled, a special-shaped intermediate blank with reasonable volume distribution needs to be prepared, and according to the principle that the blank volume is not changed in the forging process, the problems of the profile, the inclination, the wall thickness difference and the like of the blank can influence the final rolling, so that the preparation of the special-shaped blank is the key for forming the forging.
At present, there are some publications on the production and processing of the forging of the casing, such as:
1. patent application CN201711445898.3 discloses a multi-step large-diameter casing ring forging and a manufacturing method thereof. The method manufactures the casing ring forging through the processes of blanking, upsetting, punching, trestle reaming, bending, blank making by tire membranes, pre-rolling and rolling forming, and the volume distribution characteristics of the blank in the height direction meet the final forming requirements of the forging through upsetting, punching, trestle reaming and blank making by tire membranes; the blank is loaded from the upper part of the core roller die with the big end downward through a special structure, so that the rolling stability of the blank is ensured; the blank is tightly contacted with the die by adjusting the size of the ring blank, so that the blank is prevented from axially moving; the high-temperature large deformation is used for refining the crystal grains in the early stage, and the low-temperature small deformation is used for maintaining the crystal grains unchanged in the subsequent special-shaped blank making and forming processes, so that the crystal grains are fully refined. Finally, the manufacturing method of the multi-step large-diameter case ring forge piece is stable in rolling and capable of well guaranteeing the rolling precision of the forge piece.
2. Patent application CN201811625123.9 discloses a 718plus special-shaped ring forging forming method, which adopts gradual material gathering and rolling to produce a 718plus special-shaped ring forging, and specifically comprises the following steps: blanking, upsetting and punching, broaching and flattening the end face of the saddle, rectangular pre-rolling, special-shaped pre-rolling and finish rolling. In the processing process, the forming die is adopted for upsetting and punching, so that bulging of the blank can be eliminated, and the quality of the blank and the consistency of products are improved; the blank is treated by adopting the heat-insulating coating and the asbestos, so that the blank can be prevented from cracking, and good processing performance is kept. The 718plus ring forging produced by the manufacturing method has the advantages that the overall dimension meets the part processing requirement and the forming is easy; the allowance removed by machining in the manufacturing process is small, the production period is short, the material utilization rate is high, and the cost is low; the surface cracking of the blank can be effectively reduced, and the structure and the performance which meet the standard requirements of the forge piece can be obtained by controlling the forging temperature. This patent application is to roll a rectangular billet without performing a die forming.
However, in the above patent application and the conventional forging intermediate blank preparation process, a rectangular blank is formed in a die, but for an axially asymmetric multi-flange casing ring piece, it is difficult to allocate a profile volume and ensure that the profile is attached to a forming die cavity, because flanges at two ends of an outer diameter are formed in the die, a plurality of dies must be prepared to ensure that a forging piece can be smoothly released from the die, the operation difficulty is high, the steps are complex, and particularly, the forging time is difficult to control at a fetal membrane stage, so that the performance of the forging piece is influenced.
Disclosure of Invention
The invention provides a method for manufacturing an IN718 alloy axial asymmetric multi-flange casing ring piece, which aims to solve the technical problems. The near-net forming technology is adopted, the forged piece is more attached to the molded surface of the final part, the material utilization rate is improved, and the processing period is shortened; the method has the advantages that the volume distribution of the forged piece is distributed in advance by adopting a special-shaped pre-rolling method, the operation steps of a forming process of a forming die are reduced, the number of dies is reduced, the forging time is more controllable, the performance of the forged piece is ensured, the intermediate blank of the casing ring piece with reasonable volume distribution can be prepared by only using one inner die and one outer die, the forged piece can be smoothly released from the dies, and the tooling material is saved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling.
Further, the manufacturing method of the IN718 alloy axial asymmetric multi-flange casing ring specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating, upsetting and punching the heated asbestos, wherein the final forging temperature is more than or equal to 900 ℃ to obtain a blank;
② reaming the trestle, namely heating the blank and reaming the trestle, wherein the deformation is 24-26%, and the finish forging temperature is not less than 900 ℃ to obtain a rectangular blank;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
④ molding the blank by heating the blank to obtain a blank;
⑤ special-shaped finish rolling, namely heating, and then performing special-shaped finish rolling on the forming blank of the forming die by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 28-32%, and the finish forging temperature is more than or equal to 900 ℃, so as to obtain the casing ring piece.
Further, in steps ② and ③, the overall height of the rectangular blank is h, the lower section of the rectangular blank has a height of h1 and a volume of k1, the middle section has a height of h2 and a volume of k2, and the upper section has a height of h3 and a volume of k 3.
Further, in step ③, the overall height of the special-shaped pre-rolled billet is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled billet corresponding to the rectangular billet are V1, V2 and V3, the heights of the lower section, the middle section and the upper section are H1, H2 and H3, after the special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 24-26%, and the finish forging temperature is not less than 900 ℃.
Further, in step ④, the forming method of the forming die comprises the steps of firstly coating a lubricant on the outer surface of the inner die and the inner surface of the inner die, covering asbestos on one side of the large flange of the special-shaped pre-rolled blank, then placing the special-shaped pre-rolled blank into the outer die, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, then placing the inner die into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure to the inner die, enabling the inner die to be pressed into the special-shaped pre-rolled blank to be expanded, enabling the special-shaped pre-rolled blank to be expanded and filling a cavity between the inner die and the outer die, and finally.
Further, the thickness of the asbestos is 15-20 mm.
Further, in step ④, in the forming of the tire mold, the external mold non-straight profile matches with the external diameter profile of the forming blank of the tire mold, and the internal mold profile matches with the internal diameter profile of the forming blank of the tire mold.
Further, in step ④, the finish forging temperature of the forming of the tire mold is more than or equal to 900 ℃.
Further, the heating temperature is 1000-1100 ℃, the heat preservation time is (t +30) min- (t +180) min, wherein t refers to the time required by the temperature of the center of the blank rising to 14 ℃ below the heating temperature of the special-shaped finish rolling during heating.
Further, at step ⑤, the profiled core roll profile conforms to the final forging inside diameter profile and the profiled main roll 2 profile conforms to the final forging outside diameter profile.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) this application adopts near net shaping technique, and the forging is more laminated final part profile, has improved material utilization, has reduced processing cycle.
(2) The method has the advantages that the volume distribution of the forged piece is distributed in advance by adopting a special-shaped pre-rolling method, the operation steps of a forming process of the forming die are reduced, the number of dies is reduced, the forging time is more controllable, the performance of the forged piece is ensured, the intermediate blank of the casing ring piece with reasonable volume distribution can be prepared by only using one inner die and one outer die, the forged piece can be smoothly released from the dies, and the tooling material is saved.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some examples of the present invention, and for a person skilled in the art, without inventive step, other drawings can be obtained according to these drawings:
FIG. 1 is a schematic structural view of an IN718 alloy axially asymmetric multi-flange case ring of the present application;
FIG. 2 is a schematic structural diagram of the special-shaped pre-rolling of the present application;
FIG. 3 is a schematic structural view of the molding of the tire mold of the present application;
FIG. 4 is a schematic structural diagram of the special-shaped finish rolling of the present application;
FIG. 5 is a schematic diagram showing the dimensional change of the special-shaped pre-rolled blank in the special-shaped pre-rolling process;
FIG. 6 is a schematic structural diagram of a blank prepared in a conventional forging die forming process.
In the drawings: 1-a rectangular core roll; 2-special-shaped main roller 1; 3-an inner mold; 4-external mold; 5-special-shaped core roller; 6-rectangular blank; 7-a special-shaped blank; 8-outer mold half ring 1; 9-outer mold half ring 2; 10-a fixed ring; 11-a profiled main roll 2; 12-forming a blank by using a forming die; 13-casing ring.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling, and specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating the asbestos, upsetting and punching the asbestos, wherein the finish forging temperature is more than or equal to 900 ℃, and obtaining a blank, wherein the thickness of the asbestos is 15 mm;
② reaming the saddle, namely heating the blank and reaming the saddle, wherein the deformation is 24%, and the finish forging temperature is more than or equal to 900 ℃ to obtain a rectangular blank;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
the overall height of the rectangular blank is h, the height of the lower section of the rectangular blank is h1, the volume of the lower section of the rectangular blank is k1, the height of the middle section of the rectangular blank is h2, the volume of the middle section of the rectangular blank is k2, and the height of the upper section of the rectangular blank is h3, and the volume of the upper section of the rectangular blank is k 3; the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank, which correspond to the rectangular blank, are V1, V2 and V3 respectively, and the heights of the lower section, the middle section and the upper section are H1, H2 and H3 respectively; after special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 24%, and the finish forging temperature is more than or equal to 900 ℃;
④ molding the blank by heating the blank to obtain a blank;
the molding method of the tire mold comprises the following steps: firstly, coating a lubricant on an inner mold outer surface and an inner mold inner surface, covering asbestos on one side of a large flange of a special-shaped pre-rolled blank, putting the special-shaped pre-rolled blank into an outer mold, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, putting the inner mold into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure on the inner mold, enabling the inner mold to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner mold and the outer mold, and finally obtaining a forming blank of a molding bed before; in the molding of the molding bed, the non-straight profile of the outer mold is matched with the outer diameter profile of the molding bed molding blank, and the profile of the inner mold is matched with the inner diameter profile of the molding bed molding blank; the thickness of the asbestos is 15 mm; the final forging temperature of the forming die is more than or equal to 900 ℃;
⑤ special-shaped finish rolling, namely heating, and then carrying out special-shaped finish rolling on the forming blank of the moulding bed by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 28%, the finish forging temperature is more than or equal to 900 ℃, and the casing ring piece is prepared, the profile of the special-shaped core roller is consistent with the inner diameter profile of the final forging piece, and the profile of the special-shaped main roller 2 is consistent with the outer diameter profile of the final forging piece.
Further, the heating temperature of the special-shaped finish rolling is 1000 ℃, the heat preservation time is (t +180) min, wherein t refers to the time required by the temperature of the center of the blank to rise to 14 ℃ below the heating temperature of the special-shaped finish rolling during heating.
Example 2
A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling, and specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating, upsetting and punching the asbestos, wherein the finish forging temperature is more than or equal to 900 ℃, and obtaining a blank, wherein the thickness of the asbestos is 20 mm;
② reaming the saddle, namely heating the blank and reaming the saddle, wherein the deformation is 26%, and the finish forging temperature is more than or equal to 900 ℃ to obtain a rectangular blank;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
the overall height of the rectangular blank is h, the height of the lower section of the rectangular blank is h1, the volume of the lower section of the rectangular blank is k1, the height of the middle section of the rectangular blank is h2, the volume of the middle section of the rectangular blank is k2, and the height of the upper section of the rectangular blank is h3, and the volume of the upper section of the rectangular blank is k 3; the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank, which correspond to the rectangular blank, are V1, V2 and V3 respectively, and the heights of the lower section, the middle section and the upper section are H1, H2 and H3 respectively; after special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 26%, and the finish forging temperature is more than or equal to 900 ℃;
④ molding the blank by heating the blank to obtain a blank;
the molding method of the tire mold comprises the following steps: firstly, coating a lubricant on an inner mold outer surface and an inner mold inner surface, covering asbestos on one side of a large flange of a special-shaped pre-rolled blank, putting the special-shaped pre-rolled blank into an outer mold, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, putting the inner mold into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure on the inner mold, enabling the inner mold to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner mold and the outer mold, and finally obtaining a forming blank of a molding bed before; in the molding of the molding bed, the non-straight profile of the outer mold is matched with the outer diameter profile of the molding bed molding blank, and the profile of the inner mold is matched with the inner diameter profile of the molding bed molding blank; the thickness of the asbestos is 19 mm; the final forging temperature of the forming die is more than or equal to 900 ℃;
⑤ special-shaped finish rolling, namely heating, and then carrying out special-shaped finish rolling on the forming blank of the moulding bed by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 32%, the finish forging temperature is more than or equal to 900 ℃, and the casing ring piece is prepared, the profile of the special-shaped core roller is consistent with the inner diameter profile of the final forging piece, and the profile of the special-shaped main roller 2 is consistent with the outer diameter profile of the final forging piece.
Further, the heating temperature of the special-shaped finish rolling is 1100 ℃, the heat preservation time is (t +30) min, wherein t refers to the time required by the temperature of the center of the blank to rise to 14 ℃ below the heating temperature of the special-shaped finish rolling during heating.
Example 3
A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling, and specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating the asbestos, upsetting and punching the asbestos, wherein the finish forging temperature is more than or equal to 900 ℃, and obtaining a blank, wherein the thickness of the asbestos is 16 mm;
② reaming the trestle, namely heating the blank and reaming the trestle to obtain a rectangular blank, wherein the deformation is 24.5%, and the finish forging temperature is not less than 900 ℃;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
the overall height of the rectangular blank is h, the height of the lower section of the rectangular blank is h1, the volume of the lower section of the rectangular blank is k1, the height of the middle section of the rectangular blank is h2, the volume of the middle section of the rectangular blank is k2, and the height of the upper section of the rectangular blank is h3, and the volume of the upper section of the rectangular blank is k 3; the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank, which correspond to the rectangular blank, are V1, V2 and V3 respectively, and the heights of the lower section, the middle section and the upper section are H1, H2 and H3 respectively; after special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 24.5 percent, and the finish forging temperature is more than or equal to 900 ℃;
④ molding the blank by heating the blank to obtain a blank;
the molding method of the tire mold comprises the following steps: firstly, coating a lubricant on an inner mold outer surface and an inner mold inner surface, covering asbestos on one side of a large flange of a special-shaped pre-rolled blank, putting the special-shaped pre-rolled blank into an outer mold, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, putting the inner mold into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure on the inner mold, enabling the inner mold to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner mold and the outer mold, and finally obtaining a forming blank of a molding bed before; in the molding of the molding bed, the non-straight profile of the outer mold is matched with the outer diameter profile of the molding bed molding blank, and the profile of the inner mold is matched with the inner diameter profile of the molding bed molding blank; the thickness of the asbestos is 17 mm; the final forging temperature of the forming die is more than or equal to 900 ℃;
⑤ special-shaped finish rolling, namely heating, and then carrying out special-shaped finish rolling on the forming blank of the moulding bed by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 29%, the finish forging temperature is more than or equal to 900 ℃, and the casing ring piece is prepared, the profile of the special-shaped core roller is consistent with the inner diameter profile of the final forging piece, and the profile of the special-shaped main roller 2 is consistent with the outer diameter profile of the final forging piece.
Further, the heating temperature of the special-shaped finish rolling is 1020 ℃, the heat preservation time is (t +50) min, wherein t refers to the time required by the temperature of the center of the blank to be heated to 14 ℃ below the heating temperature of the special-shaped finish rolling.
Example 4
A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling, and specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating the asbestos, upsetting and punching the asbestos, wherein the finish forging temperature is more than or equal to 900 ℃ to obtain a blank, wherein the thickness of the asbestos is 19 mm;
② reaming the trestle, namely heating the blank and reaming the trestle to obtain a rectangular blank, wherein the deformation is 25.5%, and the finish forging temperature is not less than 900 ℃;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
the overall height of the rectangular blank is h, the height of the lower section of the rectangular blank is h1, the volume of the lower section of the rectangular blank is k1, the height of the middle section of the rectangular blank is h2, the volume of the middle section of the rectangular blank is k2, and the height of the upper section of the rectangular blank is h3, and the volume of the upper section of the rectangular blank is k 3; the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank, which correspond to the rectangular blank, are V1, V2 and V3 respectively, and the heights of the lower section, the middle section and the upper section are H1, H2 and H3 respectively; after special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 25.5%, and the finish forging temperature is more than or equal to 900 ℃;
④ molding the blank by heating the blank to obtain a blank;
the molding method of the tire mold comprises the following steps: firstly, coating a lubricant on an inner mold outer surface and an inner mold inner surface, covering asbestos on one side of a large flange of a special-shaped pre-rolled blank, putting the special-shaped pre-rolled blank into an outer mold, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, putting the inner mold into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure on the inner mold, enabling the inner mold to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner mold and the outer mold, and finally obtaining a forming blank of a molding bed before; in the molding of the molding bed, the non-straight profile of the outer mold is matched with the outer diameter profile of the molding bed molding blank, and the profile of the inner mold is matched with the inner diameter profile of the molding bed molding blank; the thickness of the asbestos is 18 mm; the final forging temperature of the forming die is more than or equal to 900 ℃;
⑤ special-shaped finish rolling, namely heating, and then carrying out special-shaped finish rolling on the forming blank of the moulding bed by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 31%, the finish forging temperature is more than or equal to 900 ℃, and the casing ring piece is prepared, the profile of the special-shaped core roller is consistent with the inner diameter profile of the final forging piece, and the profile of the special-shaped main roller 2 is consistent with the outer diameter profile of the final forging piece.
Further, the heating temperature of the special-shaped finish rolling is 1080 ℃, the heat preservation time is (t +150) min, wherein t refers to the time required by the temperature of the center of the blank to rise to 14 ℃ below the heating temperature of the special-shaped finish rolling during heating.
Example 5
A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece adopts a special-shaped blank to be formed IN a die and then rolled to prepare the special-shaped tapered casing ring piece, and comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling, and specifically comprises the following steps:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating, upsetting and punching the asbestos, wherein the finish forging temperature is more than or equal to 900 ℃, and obtaining a blank, wherein the thickness of the asbestos is 17 mm;
② reaming the saddle, namely heating the blank and reaming the saddle, wherein the deformation is 25%, and the finish forging temperature is more than or equal to 900 ℃ to obtain a rectangular blank;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
the overall height of the rectangular blank is h, the height of the lower section of the rectangular blank is h1, the volume of the lower section of the rectangular blank is k1, the height of the middle section of the rectangular blank is h2, the volume of the middle section of the rectangular blank is k2, and the height of the upper section of the rectangular blank is h3, and the volume of the upper section of the rectangular blank is k 3; the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank, which correspond to the rectangular blank, are V1, V2 and V3 respectively, and the heights of the lower section, the middle section and the upper section are H1, H2 and H3 respectively; after special-shaped pre-rolling, k1 is V1, k2 is V2, k3 is V3, H is 1.04H, the deformation is 25%, and the finish forging temperature is more than or equal to 900 ℃;
④ molding the blank by heating the blank to obtain a blank;
the molding method of the tire mold comprises the following steps: firstly, coating a lubricant on an inner mold outer surface and an inner mold inner surface, covering asbestos on one side of a large flange of a special-shaped pre-rolled blank, putting the special-shaped pre-rolled blank into an outer mold, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, putting the inner mold into the special-shaped pre-rolled blank, driving an upper anvil by a press to apply pressure on the inner mold, enabling the inner mold to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner mold and the outer mold, and finally obtaining a forming blank of a molding bed before; in the molding of the molding bed, the non-straight profile of the outer mold is matched with the outer diameter profile of the molding bed molding blank, and the profile of the inner mold is matched with the inner diameter profile of the molding bed molding blank; the thickness of the asbestos is 18 mm; the final forging temperature of the forming die is more than or equal to 900 ℃;
⑤ special-shaped finish rolling, namely heating, and then carrying out special-shaped finish rolling on the forming blank of the moulding bed by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 30%, the finish forging temperature is more than or equal to 900 ℃, and the casing ring piece is prepared, the profile of the special-shaped core roller is consistent with the inner diameter profile of the final forging piece, and the profile of the special-shaped main roller 2 is consistent with the outer diameter profile of the final forging piece.
Further, the heating temperature of the special-shaped finish rolling is 1050 ℃, the heat preservation time is (t +100) min, wherein t refers to the time required by the temperature of the center of the blank to be heated to 14 ℃ below the heating temperature of the special-shaped finish rolling.
Comparative example 1
The manufacture of the case ring is carried out according to the embodiment in patent application CN 201711445898.3.
To further illustrate that the present invention can achieve the technical effects, the following experiments were performed:
the method of the application examples 1-5 and the method of the comparative example 1 are adopted to respectively manufacture the casing ring piece, and the results show that:
the size of the case forging manufactured by the method in the comparative example 1 is larger, the larger deformation amount is generated after the forming of the moulding bed, so that the redistribution of the volume of the forging is more beneficial to the forming of the molded surface of the forging, and if the deformation amount of the final forging is not enough, a reasonable intermediate blank cannot be obtained by the manufacturing method in the comparative example 1;
the casing forging piece manufactured by the method in the embodiment 1-5 of the application has smaller size and does not have enough deformation in finish rolling, so that the volume distribution must be completed in the forming process of the die, and flanges at two ends need to obtain enough volume in the forming process of the die; in the method of the embodiment 1-5, only one inner die and one outer die are needed, the process is few, the manufactured forge piece can be smoothly released from the die, and the performance of the forge piece is guaranteed.
In conclusion, the method for pre-rolling the irregular shape is adopted to distribute the volume distribution of the forged piece in advance, the operation steps of the forming process of the forming die and the number of dies are reduced, the forging time is more controllable, the performance of the forged piece is ensured, the intermediate blank of the ring piece of the casing with reasonable volume distribution can be prepared by only using one inner die and one outer die, the forged piece can be smoothly released from the dies, and the tooling material is saved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A manufacturing method of an IN718 alloy axial asymmetric multi-flange casing ring piece is characterized by comprising the following steps: the special-shaped tapered casing ring piece is prepared by rolling after a special-shaped blank is formed in a die, and the method comprises the steps of upsetting and punching, trestle reaming, special-shaped pre-rolling, forming of a forming die and special-shaped finish rolling.
2. The method for manufacturing the IN718 alloy axially asymmetric multi-flange case ring according to claim 1, comprising the steps of:
① upsetting and punching, namely, filling asbestos on the upper and lower end surfaces of the IN718 alloy, heating, upsetting and punching the heated asbestos, wherein the final forging temperature is more than or equal to 900 ℃ to obtain a blank;
② reaming the trestle, namely heating the blank and reaming the trestle, wherein the deformation is 24-26%, and the finish forging temperature is not less than 900 ℃ to obtain a rectangular blank;
③ irregular pre-rolling, wherein before pre-rolling the rectangular blank, the height of the rectangular blank is divided into an upper section, a middle section and a lower section according to an irregular core roller die, the irregular pre-rolling is carried out after heating, when the pre-rolling is started, the middle section of the rectangular blank contacts the irregular main roller 1 die to deform, the upper section and the lower section are not contacted, and along with the pre-rolling, the wall thickness of the middle section of the rectangular blank is gradually reduced, the height h2 of the middle section is gradually increased, the height h1 of the lower section and the height h3 of the upper section are gradually reduced, the upper section and the lower section start to be attached to the irregular main roller 1 die, when the height of the upper section and the lower section is gathered, the outer diameter of the blank reaches the required size;
④ molding the blank by heating the blank to obtain a blank;
⑤ special-shaped finish rolling, namely heating, and then performing special-shaped finish rolling on the forming blank of the forming die by adopting a special-shaped core roller and a special-shaped main roller 2, wherein the deformation of the special-shaped finish rolling is 28-32%, and the finish forging temperature is more than or equal to 900 ℃, so as to obtain the casing ring piece.
3. The method of claim 2, wherein the overall height of the rectangular billet is h, the lower section of the rectangular billet has a height of h1 and a volume of k1, the middle section has a height of h2 and a volume of k2, and the upper section has a height of h3 and a volume of k3, IN steps ② and ③.
4. The method for manufacturing the IN718 alloy axially asymmetric multi-flange case ring member as claimed IN claim 2, wherein IN step ③, the overall height of the special-shaped pre-rolled blank is H, the volumes of the lower section, the middle section and the upper section of the special-shaped pre-rolled blank corresponding to the rectangular blank are V1, V2 and V3, the corresponding heights of the lower section, the middle section and the upper section are H1, H2 and H3, after the special-shaped pre-rolling, k 1-V1, k 2-V2, k 3-V3, H-1.04H, the deformation is 24-26%, and the finish forging temperature is not lower than 900 ℃.
5. The method for manufacturing the IN718 alloy axially asymmetric multi-flange case ring according to claim 2, wherein IN step ④, the forming method of the forming die comprises the steps of firstly coating a lubricant on an outer profile surface of the inner die and an inner profile surface of the inner die, covering asbestos on one side of a large flange of the special-shaped pre-rolled blank, then putting the special-shaped pre-rolled blank into the outer die, enabling one side of the large flange of the special-shaped pre-rolled blank to be upward, then putting the inner die into the special-shaped pre-rolled blank, driving the upper anvil by a press to apply pressure to the inner die, enabling the inner die to be pressed into the special-shaped pre-rolled blank to be expanded, expanding the special-shaped pre-rolled blank and filling a cavity between the inner die and the outer die, and finally obtaining the forming.
6. The method of manufacturing the IN718 alloy axially asymmetric multi-flange case ring of claim 2 or 5, wherein: the thickness of the asbestos is 15-20 mm.
7. The method for manufacturing an IN718 alloy axially asymmetric multi-flange case ring according to claim 2, wherein IN step ④, the outer mold non-straight profile matches the outer diameter profile of the case forming blank and the inner mold profile matches the inner diameter profile of the case forming blank.
8. The method for manufacturing the IN718 alloy axially asymmetric multi-flange case ring according to claim 2, wherein the finish forging temperature of the forming die is greater than or equal to 900 ℃ IN step ④.
9. The method of manufacturing an IN718 alloy axially asymmetric multi-flange case ring as claimed IN claim 2, wherein: the heating temperature is 1000-1100 ℃, the heat preservation time is (t +30) min- (t +180) min, wherein t refers to the time required by the temperature of the center of the blank rising to 14 ℃ below the heating temperature of the special-shaped finish rolling during heating.
10. The method for manufacturing the IN718 alloy axially asymmetric multi-flange case ring according to claim 2, wherein at step ⑤, the profiled core roll profile conforms to the final forging inside diameter profile and the profiled main roll 2 profile conforms to the final forging outside diameter profile.
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Application publication date: 20200508 |