CN114346138A - Cold extrusion molding method for high-strength aluminum alloy multi-petal combined rotary body metal piece - Google Patents
Cold extrusion molding method for high-strength aluminum alloy multi-petal combined rotary body metal piece Download PDFInfo
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- CN114346138A CN114346138A CN202111593576.XA CN202111593576A CN114346138A CN 114346138 A CN114346138 A CN 114346138A CN 202111593576 A CN202111593576 A CN 202111593576A CN 114346138 A CN114346138 A CN 114346138A
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Abstract
A cold extrusion forming process method for a high-strength aluminum alloy multi-petal combined rotary body metal piece adopts material saving, pre-extrusion, extrusion and combined extrusion to make the high-strength aluminum alloy multi-petal combined rotary body metal piece cold extrusion forming. The method effectively solves the problems of uneven interface and out-of-roundness of the extrusion inner hole caused by material springback after extrusion due to uneven extrusion stress distribution of the extrusion surface during single-flap extrusion, simultaneously avoids the influence of thermal expansion and cold contraction of hot extrusion on the shape precision of the extrusion piece, ensures that the two interfaces of the workpiece, the inner hole and the ring groove are not processed any more after extrusion, has good size precision of the extrusion piece and environment-friendly production process, and is suitable for mass production.
Description
Technical Field
The invention relates to a precise extrusion molding process of a metal part, which is particularly suitable for cold extrusion molding of a high-strength aluminum alloy multi-petal combined rotary body metal part.
Background
At present, the forming of the multi-petal revolving body metal part is mainly realized through a machining mode, the multi-petal combined revolving body metal part is most applied to the multi-petal combined revolving body metal part with high requirement on the shape precision of a machined part, the revolving body cannot be directly machined, formed and cut, and the single machining and the combined machining are needed, so that the machining procedures are multiple, the machining efficiency is low, the cost is high, and the multi-petal revolving body metal part is not suitable for mass production. The other mode is hot extrusion molding, but due to the influence of expansion with heat and contraction with cold, the mode is difficult to meet the molding of the multi-petal revolving body metal piece with high precision requirement, machining is usually needed after hot extrusion, the production efficiency is reduced, and the environmental protection performance of hot extrusion is poor.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a cold extrusion molding method of a high-strength aluminum alloy multi-petal combined rotary metal piece.
The invention relates to a cold extrusion molding method of a high-strength aluminum alloy multi-petal combined rotary body metal piece, which comprises the following steps:
1) discharging
Blanking, namely forming a rod made of the high-strength aluminum alloy 7A04-H112 material into a cylinder with the diameter of 18mm and the length of 67.8 on a lathe;
2) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
3) pre-extrusion
Placing the material saving in a die, extruding on a 1000kN press, and taking the circular arc of the extruded R32mm as a positioning reference of the next extrusion process;
4) extrusion of
Placing the pre-extruded part in a die, and extruding on a 2000kN hydraulic press, wherein the extrusion aperture is 9.6mm, the aperture of each two ends is 10.6mm, the length of each two ends is 8.5mm, the stepped hole and two interfaces form a two-interface included angle of 120 degrees;
5) cleaning of
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing;
6) annealing
The annealing equipment is a box-type electric furnace, when the furnace temperature is raised to 380 ℃, the extruded piece is placed into the box-type electric furnace, the temperature is kept for 150-180 min, then the power supply is turned off, and the workpiece is taken out after being cooled to the hour temperature along with the furnace;
7) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
8) combined extrusion
And (3) oppositely placing the extruded 3-segment inner holes in a die, extruding on a 2000kN hydraulic press to extrude 15 hole grooves with the spacing of 2.8mm, the width of 0.8mm and the depth of 0.6mm, and shaping an interface with an included angle of 120 degrees.
The invention effectively solves the problems of uneven interface and out-of-roundness of the extrusion inner hole caused by material springback after extrusion due to uneven extrusion stress distribution of the extrusion surface during single-petal extrusion, simultaneously avoids the influence of thermal expansion and cold contraction of hot extrusion on the shape precision of the extrusion piece, ensures that the two interfaces of the workpiece, the inner hole and the ring groove are not processed any more after extrusion, has good size precision of the extrusion piece and environment-friendly production process, and is suitable for mass production.
Drawings
FIG. 1-assembly;
FIG. 2-in one piece;
FIG. 3-blank;
FIG. 4-Preextruded;
FIG. 5-the shaped piece;
FIG. 6-Combined extrusion;
Detailed Description
The invention is described below with reference to the following figures and examples:
examples
The embodiment relates to a cold extrusion molding method of a high-strength aluminum alloy multi-petal combined rotary body metal piece, which comprises the following specific steps:
1) discharging
Blanking, namely, forming a bar stock made of the high-strength aluminum alloy 7A04-H112 material into a cylinder with the diameter of 18mm and the length of 67.8 on a lathe, wherein the cylinder is shown in figure 3;
2) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
3) pre-extrusion
Placing the material saving in a die, extruding on a 1000kN press, and taking the circular arc of the extruded R32mm as a positioning reference of the next extrusion process, as shown in figure 4;
4) extrusion of
Placing the pre-extruded piece into a die, and extruding on a 2000kN hydraulic press, wherein the extrusion aperture is 9.6mm, the aperture of each two ends is 10.6mm, the length of each two ends is 8.5mm, the stepped hole and two interfaces form a two-interface included angle of 120 degrees, and the angle is shown in figure 5;
5) cleaning of
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing;
6) annealing
The annealing equipment is a box-type electric furnace, when the furnace temperature is raised to 380 ℃, the extruded piece is placed into the box-type electric furnace, the temperature is kept for 150-180 min, then the power supply is turned off, and the workpiece is taken out after being cooled to the hour temperature along with the furnace;
7) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
8) combined extrusion
Placing the extruded 3-segment inner holes in a mold in opposite directions, extruding on a 2000kN hydraulic press to extrude 15 hole grooves with the spacing of 2.8mm, the width of 0.8mm and the depth of 0.6mm, and shaping a boundary surface with an included angle of 120 degrees, wherein the shape is shown in figure 6.
The beneficial effects of this embodiment are as follows: the cold extrusion production efficiency is high, and the average processing efficiency is 20 times of that of machining production; the cost is low, the extrusion processing cost is only 12 elements/piece due to less procedures, and the machining needs 120 elements/piece; the combination extrusion ensures that the extruded product has good shape and size consistency and stable and reliable quality.
Claims (1)
1. A cold extrusion molding method of a high-strength aluminum alloy multi-petal combined rotary body metal piece comprises the following steps:
1) discharging
Blanking, namely forming a rod made of the high-strength aluminum alloy 7A04-H112 material into a cylinder with the diameter of 18mm and the length of 67.8 on a lathe;
2) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
3) pre-extrusion
Placing the material saving in a die, extruding on a 1000kN press, and taking the circular arc of the extruded R32mm as a positioning reference of the next extrusion process;
4) extrusion of
Placing the pre-extruded part in a die, and extruding on a 2000kN hydraulic press, wherein the extrusion aperture is 9.6mm, the aperture of each two ends is 10.6mm, the length of each two ends is 8.5mm, the stepped hole and two interfaces form a two-interface included angle of 120 degrees;
5) cleaning of
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing;
6) annealing
The annealing equipment is a box-type electric furnace, when the furnace temperature is raised to 380 ℃, the extruded piece is placed into the box-type electric furnace, the temperature is kept for 150-180 min, then the power supply is turned off, and the workpiece is taken out after being cooled to the hour temperature along with the furnace;
7) surface lubrication
Cleaning and deoiling, mixing 50kg of sodium hydroxide (NaOH), 30kg of sodium carbonate (Na2CO3) and 350kg of water, uniformly stirring, placing in a stainless steel tank with the temperature of (30-50) DEG C for (1-3) min, taking out, washing with hot water at the temperature of 80-100℃ for (0.5-1) min, taking out, and airing; phosphorization and saponification, namely putting a workpiece into special film-forming agent XY033 bath solution for aluminum alloy at the temperature of 40-60 ℃ for soaking (3-5) min, washing with cold water for (0.5-1) min, putting the workpiece into a stainless steel bath with the content of QA-017 of industrial soap being 30-50 at the temperature of 60-80 ℃ for soaking (5-8) min, and taking out and airing;
8) combined extrusion
And (3) oppositely placing the extruded 3-segment inner holes in a die, extruding on a 2000kN hydraulic press to extrude 15 hole grooves with the spacing of 2.8mm, the width of 0.8mm and the depth of 0.6mm, and shaping an interface with an included angle of 120 degrees.
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Citations (7)
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|---|---|---|---|---|
| CN1603057A (en) * | 2004-08-26 | 2005-04-06 | 薛安志 | Precision casting and extrusion processing technique of high-carbon chromium bearing steel cycloid wheel |
| CN103071690A (en) * | 2013-02-05 | 2013-05-01 | 上海工程技术大学 | Cold and hot extrusion molding method of rotary thick-walled shell part for vehicle |
| CN103350346A (en) * | 2013-07-06 | 2013-10-16 | 江苏威鹰机械有限公司 | Power takeoff transmission shaft cold precision forging plastic forming process |
| CN108856631A (en) * | 2018-05-25 | 2018-11-23 | 昆山麦克司博精密机械有限公司 | The cold-heading molding technique of automobile gear |
| CN111702433A (en) * | 2020-06-29 | 2020-09-25 | 陕西奉航橡胶密封件有限责任公司 | Backflow line extrusion forming cutter and backflow line cold extrusion forming process |
| US20210053099A1 (en) * | 2019-08-21 | 2021-02-25 | Jin Yuncheng Enterprise Co., Ltd. | Method for manufacturing cold-forged, extruded aluminum alloy tube |
| CN112474856A (en) * | 2020-12-09 | 2021-03-12 | 北京航星机器制造有限公司 | Extruded section shape correction die and shape correction method thereof |
-
2021
- 2021-12-23 CN CN202111593576.XA patent/CN114346138B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1603057A (en) * | 2004-08-26 | 2005-04-06 | 薛安志 | Precision casting and extrusion processing technique of high-carbon chromium bearing steel cycloid wheel |
| CN103071690A (en) * | 2013-02-05 | 2013-05-01 | 上海工程技术大学 | Cold and hot extrusion molding method of rotary thick-walled shell part for vehicle |
| CN103350346A (en) * | 2013-07-06 | 2013-10-16 | 江苏威鹰机械有限公司 | Power takeoff transmission shaft cold precision forging plastic forming process |
| CN108856631A (en) * | 2018-05-25 | 2018-11-23 | 昆山麦克司博精密机械有限公司 | The cold-heading molding technique of automobile gear |
| US20210053099A1 (en) * | 2019-08-21 | 2021-02-25 | Jin Yuncheng Enterprise Co., Ltd. | Method for manufacturing cold-forged, extruded aluminum alloy tube |
| CN111702433A (en) * | 2020-06-29 | 2020-09-25 | 陕西奉航橡胶密封件有限责任公司 | Backflow line extrusion forming cutter and backflow line cold extrusion forming process |
| CN112474856A (en) * | 2020-12-09 | 2021-03-12 | 北京航星机器制造有限公司 | Extruded section shape correction die and shape correction method thereof |
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