CN114260363A - Cold bulging method for large-sized special-shaped section ring forging - Google Patents
Cold bulging method for large-sized special-shaped section ring forging Download PDFInfo
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- CN114260363A CN114260363A CN202111561209.1A CN202111561209A CN114260363A CN 114260363 A CN114260363 A CN 114260363A CN 202111561209 A CN202111561209 A CN 202111561209A CN 114260363 A CN114260363 A CN 114260363A
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- 238000005242 forging Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 238000003754 machining Methods 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Abstract
The invention discloses a cold bulging method for a large-scale special-shaped section ring forging, which comprises the following steps: obtaining a ring forging, setting an initial mark on the ring forging, and installing the ring forging in a split mold, wherein the initial mark is aligned with a gap of a split mold in the split mold; performing first wheel bulging on the ring forging, wherein the first wheel bulging comprises 2-4 times of bulging processes; taking out the ring forging and adjusting the initial mark to align with the gap of the split mold, and then putting the ring forging into the split mold again; performing second wheel bulging on the ring forging, wherein the second wheel bulging comprises 4-6 times of bulging processes; and demolding to obtain a finished product. According to the cold bulging method provided by the invention, the overall shape of the ring forging is corrected firstly through a two-wheel bulging process, then the size of the ring forging is subjected to finish machining, the residual stress of the ring forging can be effectively eliminated, the size precision is improved, and the requirement on the stroke of equipment can be effectively reduced and the applicability is improved through adjusting the initial position of the ring forging between two-wheel bulging.
Description
Technical Field
The invention relates to the field of processing methods of forgings, in particular to a cold bulging method of a large-scale special-shaped section ring forging.
Background
In order to obtain higher strength and achieve the best combination of strength and toughness in aluminium alloy components, the most commonly used method is to use a faster quench rate. However, in the quenching process, because the aluminum alloy member is rapidly cooled, the cooling speed of the outer surface of the workpiece is inconsistent with that of the core part, and a large temperature gradient exists, so that the cooling shrinkage of the material is not uniform, and serious quenching residual stress is generated in the workpiece. The existence of residual stress greatly affects the workability, fatigue life, corrosion resistance and the like of the workpiece. Therefore, the cold bulging treatment is carried out on the ring forging with the special-shaped section, so that the residual stress can be effectively eliminated, and the performance requirement is met.
In the prior art, a method for eliminating residual stress of a ring forging after solution treatment is commonly adopted by hot bulging and cold bulging, and due to the fact that the size precision of the hot bulging is difficult to control, and bulging equipment needs to be preheated in advance and the ring forging needs to be heated, energy consumption is high, and the size of the bulging is limited; the cold bulging process in the prior art is often unreasonable in design, resulting in poor product stability.
Therefore, how to effectively improve the product weight and the stability of the large-sized special-shaped section ring forging is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a cold bulging method for a large special-shaped section ring forging, which is used for improving the product quality and improving the stability and the dimensional accuracy.
In order to achieve the purpose, the invention provides the following technical scheme:
a cold bulging method for a large-scale special-shaped section ring forging comprises the following steps:
step S1: obtaining a ring forging, setting an initial mark on the ring forging, and installing the ring forging in a split mold, wherein the initial mark is aligned with a gap of a split mold in the split mold;
step S2: performing first wheel bulging on the ring forging, wherein the first wheel bulging comprises 2-4 times of bulging processes;
step S3: taking out the ring forging, adjusting the gap between the initial mark and the split mold to align, and loading the ring forging into the split mold again;
step S4: performing second wheel bulging on the ring forging, wherein the second wheel bulging comprises 4-6 times of bulging processes;
step S5: and demolding to obtain a finished product.
Preferably, the ring forging is an aluminum alloy ring forging.
Preferably, the diameter of the ring segment component is 4-6 meters.
Preferably, the ring forging is a 2219 aluminum alloy ring forging.
Preferably, the split mold comprises a taper rod and N split molds, each split mold has the same size, and the corresponding circumferential angle is a, where a is 360 °/N.
Preferably, the first wheel bulging comprises:
performing first bulging on the ring forging;
controlling the ring forging to rotate clockwise for an angle of A/2 +/-2 degrees along the central axis of the split mold;
performing secondary bulging on the ring forging;
controlling the ring forging to rotate anticlockwise for an angle of A/4 +/-2 degrees along the central shaft of the split mold;
performing third bulging on the ring forging;
and controlling the ring forging to rotate clockwise by 3A/4 +/-2 degrees along the central axis of the split mold.
Preferably, the first bulging comprises:
controlling the valve components to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 8-12S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
controlling the ring forging to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
controlling the ring forging to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 14-18S, and the pressure maintaining time is 20-30S;
preferably, the second wheel bulging comprises:
performing first bulging on the ring forging;
controlling the ring forging to rotate clockwise for an angle of A/4 +/-2 degrees along the central axis of the split mold;
performing secondary bulging on the ring forging;
controlling the ring forging to rotate anticlockwise for A/2 +/-2 degrees along the central shaft of the split mold;
performing third bulging on the ring forging;
controlling the ring forging to rotate along the central shaft of the split mold in an anticlockwise direction by A/10 +/-1 degree;
performing fourth bulging on the ring forging;
controlling the ring forging to rotate clockwise by 2A/3 +/-2 degrees along the central shaft of the split mold;
and performing fifth bulging on the ring forging.
Preferably, the first bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 9-13S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 16-20S, and the pressure maintaining time is 18-23S;
the fourth bulging comprises:
controlling the valve dividing valve to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 20-24S, and the pressure maintaining time is 20-25S;
the fifth bulging comprises:
and controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 22-26S, and the pressure maintaining time is 45-60S.
Preferably, the inner diameter of the ring forging is 4890-4896 mm, and the inner diameter of the finished product is 5048-5052 mm.
The invention provides a cold bulging method for a large-scale special-shaped section ring forging, which comprises the following steps: step S1: obtaining a ring forging, setting an initial mark on the ring forging, and installing the ring forging in a split mold, wherein the initial mark is aligned with a gap of a split mold in the split mold; step S2: performing first wheel bulging on the ring forging, wherein the first wheel bulging comprises 2-4 times of bulging processes; step S3: taking out the ring forging, adjusting the gap between the initial mark and the split mold to align, and loading the ring forging into the split mold again; step S4: performing second wheel bulging on the ring forging, wherein the second wheel bulging comprises 4-6 times of bulging processes; step S5: and demolding to obtain a finished product. According to the cold bulging method for the large-sized ring forging with the special-shaped cross section, the whole shape of the ring forging is corrected firstly through a two-wheel bulging process, then the size of the ring forging is subjected to finish machining, the residual stress of the ring forging can be effectively eliminated, the size precision is improved, the requirement on the stroke of equipment can be effectively reduced through adjustment of the initial position of the ring forging between two-wheel bulging, and the applicability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of a cold bulging method for a large-scale special-shaped cross-section ring forging provided by the invention;
FIG. 2 is a front view of a large special-shaped cross-section ring forging and bulging die provided by the invention;
FIG. 3 is a top view of a large special-shaped cross-section ring forging and bulging die provided by the invention;
figure 4 is a cross-sectional view of a ring obtained by the method according to the invention;
wherein: 1-ring forging; 2-split mold; 3-a conical rod.
Detailed Description
The core of the invention is to provide a cold bulging method for a large-scale special-shaped section ring forging, which can effectively improve the product quality and the stability and the dimensional accuracy.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a flow chart of an embodiment of a cold bulging method of a large-scale special-shaped cross-section ring forging according to the present invention; FIG. 2 is a front view of a large special-shaped cross-section ring forging and bulging die provided by the invention; FIG. 3 is a top view of a large special-shaped cross-section ring forging and bulging die provided by the invention; figure 4 is a cross-sectional view of a ring obtained by the method according to the invention.
In the embodiment, the cold bulging method for the large-sized special-shaped section ring forging comprises the following steps:
step S1: obtaining an annular forging 1, setting an initial mark on the annular forging 1, and installing the annular forging 1 in a split mold 2, wherein the initial mark is aligned with a gap of a split mold in the split mold 2;
step S2: performing first round bulging on the ring forging 1 to achieve the purpose of shape correction, wherein the first round bulging comprises 2-4 times of bulging processes;
step S3: taking out the ring forging 1, adjusting the gap between the initial mark and the split mold to align, and loading the ring forging into the split mold 2 again;
step S4: performing second wheel bulging on the ring forging 1 to achieve the purpose of precision adjustment, wherein the second wheel bulging comprises 4-6 times of bulging processes;
step S5: and demolding to obtain a finished product.
According to the cold bulging method for the large-sized ring forging with the special-shaped cross section, the whole shape of the ring forging 1 is corrected firstly through a two-wheel bulging process, then the size of the ring forging 1 is subjected to finish machining, the residual stress of the ring forging 1 can be effectively eliminated, the size precision is improved, and the requirement on the stroke of equipment can be effectively reduced and the applicability is improved through adjusting the initial position of the ring forging 1 between two-wheel bulging.
In addition to the above embodiments, the ring forging 1 is an aluminum alloy ring forging.
On the basis of the above embodiments, the diameter of the ring segment member is 4-6 meters.
In addition to the above embodiments, the ring forging 1 is a 2219 aluminum alloy ring forging.
In addition to the above embodiments, the split mold 2 includes the tapered rod 33 and N split molds, each of which has the same size and corresponds to a circumferential angle a of 360 °/N.
Further, the first wheel bulging comprises:
performing primary bulging on the ring forging 1;
the control ring forging 1 rotates clockwise A/2 +/-2 degrees along the central axis of the split mold 2;
performing secondary bulging on the ring forging 1;
the control ring forging 1 rotates anticlockwise for A/4 +/-2 degrees along the central shaft of the split die 2;
performing third bulging on the ring forging 1;
the control ring forging 1 rotates clockwise by 3A/4 +/-2 degrees along the central axis of the split die 2.
Further, the first bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 8-12S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
feeding the control ring forging 1 in the radial direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
feeding the control ring forging 1 in the radial direction, wherein the feeding amount is 8-12mm, the bulging time is 14-18S, and the pressure maintaining time is 20-30S;
in addition to the above embodiments, the second wheel bulging includes:
performing primary bulging on the ring forging 1;
the control ring forging 1 rotates clockwise for A/4 +/-2 degrees along the central axis of the split mold 2;
performing secondary bulging on the ring forging 1;
the control ring forging 1 rotates anticlockwise for A/2 +/-2 degrees along the central shaft of the split die 2;
performing third bulging on the ring forging 1;
the control ring forging 1 rotates anticlockwise for A/10 +/-1 degrees along the central shaft of the split die 2;
performing fourth bulging on the ring forging 1;
the control ring forging 1 rotates clockwise by 2A/3 +/-2 degrees along the central axis of the split mold 2;
and performing fifth bulging on the ring forging 1.
Further, the first bulging includes:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 9-13S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 16-20S, and the pressure maintaining time is 18-23S;
the fourth bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 20-24S, and the pressure maintaining time is 20-25S;
the fifth bulging includes:
and controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 22-26S, and the pressure maintaining time is 45-60S.
On the basis of the above embodiments, the inner diameter of the ring forging 1 is 4890-4896 mm, and the inner diameter of the finished product is 5048-5052 mm.
In a particular embodiment, the first wheel bulging comprises:
the feeding amount of the valve components in the radius direction is set to be 10mm, the bulging time is 8-12S, the pressure maintaining time is 10-15S, the ring forging 1 rotates clockwise 15 degrees along the central axis, and the first bulging is completed; (ii) a
Setting the feeding amount of the sub-valve in the radial direction to be 10mm, setting the bulging time to be 12-15S, and setting the pressure maintaining time to be 15-20S, so that the ring forging 1 rotates anticlockwise by 7.5 degrees along the central shaft, and finishing the second bulging;
setting the feeding amount of the valve components in the radial direction to be 10mm, the bulging time to be 14-18S, the pressure maintaining time to be 20-30S, and then enabling the annular forging piece 1 to rotate clockwise for 22.5 degrees along the central axis;
after the first wheel is expanded, the taper rod 33 is moved upwards to close the branch valve, and the expanded special-shaped section ring piece is taken out; then, hoisting the ring forging 1, reinstalling the tool to achieve the target size, requiring the initial mark on the upper end surface of the ring forging 1 and the gap between the valve components to perform bulging in a second round;
the second wheel bulging comprises:
the feeding amount of the valve components in the radius direction is set to be 11mm, the bulging time is 9-13S, the pressure maintaining time is 10-15S, the ring forging 1 rotates clockwise by 7.5 degrees along the central axis, and the first bulging is completed;
setting the feeding amount of the sub-valve in the radial direction to be 10mm, setting the bulging time to be 12-15S, and setting the pressure maintaining time to be 15-20S, so that the ring forging 1 rotates anticlockwise by 15 degrees along the central shaft, and finishing the second bulging;
the feeding amount of the sub-valve in the radius direction is set to be 10mm, the bulging time is 16-20S, the pressure maintaining time is 18-23S, and the ring forging 1 rotates anticlockwise for 3 degrees along the central shaft to complete the third bulging;
the feeding amount of the sub-valve in the radius direction is set to be 11mm, the bulging time is 20-24S, the pressure maintaining time is 20-25S, the ring forging 1 rotates clockwise by 19.5 degrees along the central axis, and the fourth bulging is completed;
and setting the feeding amount of the valve parting along the radial direction to be 10mm, setting the bulging time to be 22-26S, and setting the pressure maintaining time to be 45-60S, thereby completing the fifth bulging.
After cold bulging, the 2219 alloy annular forging with the special-shaped cross section is made of, the inner diameter is 4890-4896 mm, the outer diameter is 5048-5052 mm, and the requirements are met; and the size precision of the ring forging 1 is high, the residual stress is eliminated, and the stress distribution of the ring forging 1 after cold bulging is more uniform.
The cold bulging method of the large-sized special-shaped section ring forging provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A cold bulging method for a large-scale special-shaped section ring forging is characterized by comprising the following steps:
step S1: obtaining a ring forging (1), setting an initial mark on the ring forging (1), and installing the ring forging (1) in a split mold (2), wherein the initial mark is aligned with a gap of a split mold in the split mold (2);
step S2: carrying out first wheel bulging on the ring forging (1), wherein the first wheel bulging comprises 2-4 times of bulging processes;
step S3: taking out the ring forging (1), adjusting the initial mark to be aligned with the gap of the split mold, and putting the ring forging into the split mold (2) again;
step S4: performing second wheel bulging on the ring forging (1), wherein the second wheel bulging comprises 4-6 times of bulging processes;
step S5: and demolding to obtain a finished product.
2. The cold bulging method of a large-sized special-shaped section ring forging according to claim 1, wherein the ring forging (1) is an aluminum alloy ring forging.
3. The cold bulging method of a large-scale special-shaped section ring forging according to claim 2, wherein the diameter of the ring segment component is 4-6 m.
4. The cold bulging method of a large-sized special-shaped section ring forging according to claim 3, characterized in that the ring forging (1) is 2219 aluminum alloy ring forging.
5. The cold-bulging method of large-sized special-shaped cross-section ring forgings according to any one of claims 1 to 4, characterized in that the split die (2) comprises a tapered rod (3) (3) and N split dies, each split die has the same size, and the corresponding circumferential angle is A, and A is 360 °/N.
6. The cold bulging method of a large-sized special-shaped cross-section ring forging according to claim 5, wherein the first round bulging comprises:
carrying out primary bulging on the ring forging (1);
controlling the ring forging (1) to rotate clockwise for an angle of A/2 +/-2 degrees along the central axis of the split mold (2);
performing secondary bulging on the ring forging (1);
controlling the ring forging (1) to rotate anticlockwise for A/4 +/-2 degrees along the central shaft of the split mold (2);
carrying out third bulging on the ring forging (1);
and controlling the ring forging (1) to rotate clockwise by 3A/4 +/-2 degrees along the central axis of the split mold (2).
7. The cold bulging method of a large-sized special-shaped cross-section ring forging according to claim 6, wherein the first bulging comprises:
controlling the valve components to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 8-12S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
controlling the ring forging (1) to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
and controlling the ring forging (1) to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 14-18S, and the pressure maintaining time is 20-30S.
8. The cold bulging method of a large-sized special-shaped cross-section ring forging according to claim 5, wherein the second round bulging comprises:
carrying out primary bulging on the ring forging (1);
controlling the ring forging (1) to rotate clockwise for an angle of A/4 +/-2 degrees along the central axis of the split mold (2);
performing secondary bulging on the ring forging (1);
controlling the ring forging (1) to rotate anticlockwise for A/2 +/-2 degrees along the central shaft of the split mold (2);
carrying out third bulging on the ring forging (1);
controlling the ring forging (1) to rotate anticlockwise by A/10 +/-1 degrees along the central shaft of the split mold (2);
performing fourth bulging on the ring forging (1);
controlling the ring forging (1) to rotate clockwise by 2A/3 +/-2 degrees along the central axis of the split mold (2);
and performing fifth bulging on the ring forging (1).
9. The cold bulging method of a large-sized special-shaped cross-section ring forging according to claim 8, wherein the first bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 9-13S, and the pressure maintaining time is 10-15S;
the second bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 12-15S, and the pressure maintaining time is 15-20S;
the third bulging comprises:
controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 16-20S, and the pressure maintaining time is 18-23S;
the fourth bulging comprises:
controlling the valve dividing valve to feed along the radius direction, wherein the feeding amount is 9-13mm, the bulging time is 20-24S, and the pressure maintaining time is 20-25S;
the fifth bulging comprises:
and controlling the sub-valves to feed along the radius direction, wherein the feeding amount is 8-12mm, the bulging time is 22-26S, and the pressure maintaining time is 45-60S.
10. The cold bulging method for the large-scale special-shaped section ring forging according to claim 5, wherein the inner diameter of the ring forging (1) is 4890-4896 mm, and the inner diameter of the finished product is 5048-5052 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111561209.1A CN114260363A (en) | 2021-12-16 | 2021-12-16 | Cold bulging method for large-sized special-shaped section ring forging |
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| CN202111561209.1A CN114260363A (en) | 2021-12-16 | 2021-12-16 | Cold bulging method for large-sized special-shaped section ring forging |
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| CN107363154A (en) * | 2017-07-11 | 2017-11-21 | 武汉理工大学 | A kind of swollen extrusion forming method of complex mesh muscle ring |
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