CN112059018B - Method for molding special-shaped water gap by single-engineering special-shaped piece mold - Google Patents
Method for molding special-shaped water gap by single-engineering special-shaped piece mold Download PDFInfo
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- CN112059018B CN112059018B CN202011069535.6A CN202011069535A CN112059018B CN 112059018 B CN112059018 B CN 112059018B CN 202011069535 A CN202011069535 A CN 202011069535A CN 112059018 B CN112059018 B CN 112059018B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000465 moulding Methods 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 21
- 239000011265 semifinished product Substances 0.000 claims description 64
- 230000001050 lubricating effect Effects 0.000 claims description 33
- 239000004677 Nylon Substances 0.000 claims description 13
- 229920001778 nylon Polymers 0.000 claims description 13
- 239000004642 Polyimide Substances 0.000 claims description 10
- 229920001721 polyimide Polymers 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- 238000012938 design process Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a design process of a simplex Cheng Yixing stretching piece mold forming nozzle, and belongs to the technical field of nozzle forming molds and processes. The die comprises six sets of dies, namely a first flange cylinder stretching die, a second flange cylinder stretching die, a flange conical stretching die, a flange special-shaped stretching die, a bottom rectangular stretching die and an integral shaping die, wherein the initial cylinder stretching, the re-stretching, the flange conical stretching, the bottom rectangular stretching and the integral shaping are sequentially realized through the six dies, particularly, when the bottom rectangular stretching is carried out, the stretch breaking phenomenon is easy to occur, and when the pressure change force is properly regulated to be within a range of 20KN-25KN, the stretch breaking phenomenon can be effectively avoided, and the yield of products is greatly improved.
Description
Technical Field
The invention relates to the technical field of nozzle forming dies and processes, in particular to a method for forming a special-shaped nozzle by a single-engineering special-shaped piece die.
Background
The steel pouring opening is arranged at one side of the bottom of the steel ladle, and can enable molten steel to flow out of the steel ladle, so the steel ladle is also called a steel ladle nozzle.
The ladle nozzle is generally a pouring member, but along with the technical progress, a thin-wall member is adopted, the existing ladle nozzle is formed by a series of stretching, and the special-shaped nozzle is formed, but when the bottom rectangle is stretched in the stretching process, the stretch-breaking phenomenon is generated for a long time, so that the yield is influenced.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for molding a special-shaped nozzle by using a single-engineering special-shaped piece die.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for molding a special-shaped water gap by a single-engineering special-shaped piece mold comprises six sets of molds, namely a first flange cylinder stretching mold, a second flange cylinder stretching mold, a flange conical stretching mold, a flange special-shaped stretching mold, a bottom rectangular stretching mold and an integral shaping mold, and comprises the following process steps:
step one, primary stretching of a cylinder: mounting the cut circular plate on a working platform of a press where a flange cylinder one-stretching die is located, and primarily stretching the circular plate by the flange cylinder one-stretching die to obtain a flange cylinder semi-finished product;
step two, stretching the cylinder again: removing the semi-finished product of the flange cylinder to a working platform of a press where a second stretching die of the flange cylinder is located, and stretching the semi-finished product of the flange cylinder again through the second stretching die of the flange cylinder to obtain the semi-finished product of the flange cylinder;
step three, flange cone stretching: removing the second semi-finished product of the flange cylinder and moving the second semi-finished product of the flange cylinder to a working platform of a press where the flange cone stretching die is located, and stretching the second semi-finished product of the flange cylinder through the flange cone stretching die to obtain a semi-finished product of the flange cone;
step four, flange special-shaped stretching: removing the flange conical semi-finished product and moving the flange conical semi-finished product to a working platform of a press machine where a flange special-shaped stretching die is located, and stretching the flange conical semi-finished product through the flange special-shaped stretching die to obtain a flange special-shaped semi-finished product;
step five, rectangular stretching at the bottom: removing the flange special-shaped semi-finished product and moving the flange special-shaped semi-finished product to a working platform of a press machine where a bottom rectangular stretching die is located, stretching the flange special-shaped semi-finished product through the bottom rectangular stretching die, increasing a pressure change force in the stretching process, and adjusting the pressure change force to 20KN-25KN to obtain a bottom rectangular stretching semi-finished product;
step six, integral shaping: and taking down the bottom rectangular stretching semi-finished product, moving the bottom rectangular stretching semi-finished product to a working platform of a press machine where the integral shaping die is located, shaping the bottom rectangular stretching semi-finished product through the integral shaping die, and obtaining a finished product of the special-shaped water gap.
In a further preferred embodiment of the invention, in step five, the flange profiled semifinished product is initially preheated to a temperature of 150 ℃ to 250 ℃ before stretching.
In a further preferred scheme of the invention, after the stretching is finished, the bottom rectangular stretching die is cooled and lowered before being separated from the bottom rectangular stretching semi-finished product, and the cooling and lowering speed is 10-15 ℃ every ten seconds.
In a further preferred scheme of the invention, the temperature difference between the upper die and the lower die of the six groups of dies is 60 ℃ to 130 ℃, and the upper die and the corresponding lower die are in a constant temperature state.
According to a further preferred scheme of the invention, the surfaces of the upper die and the lower die of the upper six groups of dies are provided with lubricating layers, the lubricating layers comprise polyimide lubricating layers and nylon lubricating layers which are alternately arranged, and the thickness of each adjacent polyimide lubricating layer is not more than the thickness of the nylon lubricating layer and is not less than one third of the thickness of the nylon lubricating layer.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the primary stretching, the secondary stretching, the flange conical stretching, the bottom rectangular stretching and the integral shaping of the cylinder are sequentially realized through six types of dies, particularly, the stretch cracking phenomenon is easy to occur during the bottom rectangular stretching, and the stretch cracking phenomenon can be effectively avoided by properly adjusting the pressure change force to be within the range of 2000KG-2500KG, so that the yield of products is greatly improved.
2. According to the invention, the preliminary preheating is carried out before the flange semi-finished product is stretched, the plasticity of the workpiece can be greatly improved when the preheating temperature is 150-250 ℃, the stretch cracking phenomenon in the stretching process is avoided, the stretching yield is greatly improved, meanwhile, the cooling is carried out after the stretching, the temperature is reduced by 10-15 ℃ every ten seconds, the recrystallization in the workpiece is prevented, and the stretching quality is improved.
3. The invention uses the constant temperature between the upper die and the lower die of the six groups of dies, and the temperature difference is 60 ℃ to 130 ℃, so that the transformation from austenite to martensite in the interior can be reduced, and meanwhile, the stress concentration can be effectively reduced, and the hardening and embrittlement of the stainless steel material can be avoided, thereby effectively improving the stretching quality.
4. The surfaces of the upper die and the lower die of the six groups of dies are respectively provided with a lubricating layer, and the purpose of utilizing the lubricating layer which adopts a multilayer structure and consists of the polyimide lubricating layer and the nylon lubricating layer is to comprehensively achieve the lubricating effect by means of the low surface tension of the polyimide lubricating layer and the plastic viscosity of nylon.
Drawings
FIG. 1 is a drawing process forming step diagram of the present invention;
fig. 2 is a schematic view of the special-shaped nozzle structure of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
As shown in FIG. 1, the method for molding the special-shaped water gap by the single-engineering special-shaped piece mold comprises six sets of molds, namely a first flange cylinder stretching mold, a second flange cylinder stretching mold, a conical flange stretching mold, a special-shaped flange stretching mold, a rectangular bottom stretching mold and an integral shaping mold, and comprises the following process steps:
step one, primary stretching of a cylinder: mounting the cut circular plate on a working platform of a press where a flange cylinder one-stretching die is located, and primarily stretching the circular plate by the flange cylinder one-stretching die to obtain a flange cylinder semi-finished product;
step two, stretching the cylinder again: removing the semi-finished product of the flange cylinder to a working platform of a press where a second stretching die of the flange cylinder is located, and stretching the semi-finished product of the flange cylinder again through the second stretching die of the flange cylinder to obtain the semi-finished product of the flange cylinder;
step three, flange cone stretching: removing the second semi-finished product of the flange cylinder and moving the second semi-finished product of the flange cylinder to a working platform of a press where the flange cone stretching die is located, and stretching the second semi-finished product of the flange cylinder through the flange cone stretching die to obtain a semi-finished product of the flange cone;
step four, flange special-shaped stretching: removing the flange conical semi-finished product and moving the flange conical semi-finished product to a working platform of a press machine where a flange special-shaped stretching die is located, and stretching the flange conical semi-finished product through the flange special-shaped stretching die to obtain a flange special-shaped semi-finished product;
step five, rectangular stretching at the bottom: removing the flange special-shaped semi-finished product to a press working platform where the bottom rectangular stretching die is located, stretching the flange special-shaped semi-finished product through the bottom rectangular stretching die, increasing the pressure change force in the stretching process, and adjusting the pressure change force to 20KN-25KN, preferably 24.5KN, so as to obtain the bottom rectangular stretching semi-finished product;
step six, integral shaping: and taking down the bottom rectangular stretching semi-finished product, moving the bottom rectangular stretching semi-finished product to a working platform of a press machine where the integral shaping die is located, shaping the bottom rectangular stretching semi-finished product through the integral shaping die, and obtaining a finished product of the special-shaped water gap.
According to the invention, the primary stretching, the re-stretching, the flange conical stretching, the bottom rectangular stretching and the integral shaping of the cylinder are sequentially realized through six types of dies, particularly, the stretch cracking phenomenon is easy to occur during the bottom rectangular stretching, and the stretch cracking phenomenon can be effectively avoided by properly adjusting the pressure change force to be within the range of 20KN-25KN, so that the yield of products is greatly improved.
Example 2:
the following modifications were made on the basis of example 1: in the fifth operation, the flange special-shaped semi-finished product is preliminarily preheated to 210 ℃ before stretching.
According to a further preferred scheme of the invention, after stretching is completed, cooling is carried out on the bottom rectangular stretching die and the bottom rectangular stretching semi-finished product before separating, and the cooling speed is reduced by 13 ℃ every ten seconds.
According to the invention, the preliminary preheating is carried out before the flange semi-finished product is stretched, the plasticity of the workpiece can be greatly improved when the preheating temperature is 150-250 ℃, the stretch cracking phenomenon in the stretching process is avoided, the stretching yield is greatly improved, meanwhile, the cooling is carried out after the stretching, the temperature is reduced by 10-15 ℃ every ten seconds, the recrystallization in the workpiece is prevented, and the stretching quality is improved.
Example 3:
the following modifications were made on the basis of example 1: the temperature difference between the upper die and the lower die of the six groups of dies is 60-130 ℃, preferably 124 ℃, and the upper die and the corresponding lower die are in a constant temperature state.
The invention uses the constant temperature between the upper die and the lower die of the six groups of dies, and the temperature difference is 60 ℃ to 130 ℃, so that the transformation from austenite to martensite in the interior can be reduced, and meanwhile, the stress concentration can be effectively reduced, and the hardening and embrittlement of the stainless steel material can be avoided, thereby effectively improving the stretching quality.
Example 4:
the following modifications were made on the basis of example 1: the surface of the upper die and the lower die of the upper six groups of dies is provided with a lubricating layer, the lubricating layer comprises polyimide lubricating layers and nylon lubricating layers which are alternately arranged, and the thickness of each adjacent polyimide lubricating layer is not more than the thickness of each nylon lubricating layer and is not less than one third of the thickness of each nylon lubricating layer.
The surfaces of the upper die and the lower die of the six groups of dies are respectively provided with a lubricating layer, and the purpose of utilizing the lubricating layer which adopts a multilayer structure and consists of the polyimide lubricating layer and the nylon lubricating layer is to comprehensively achieve the lubricating effect by means of the low surface tension of the polyimide lubricating layer and the plastic viscosity of nylon.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitutions may be partial structures, devices, or method steps, or may be a complete solution. The technical proposal and the invention concept are equivalent to or changed in accordance with the invention, and the invention is covered in the protection scope of the invention.
Claims (5)
1. The method for molding the special-shaped water gap by using the single-engineering special-shaped piece die is characterized by comprising six sets of dies, namely a flange cylinder one-stretching die, a flange cylinder two-stretching die, a flange cone stretching die, a flange special-shaped stretching die, a bottom rectangular stretching die and an integral shaping die, wherein the process steps are as follows:
step one, primary stretching of a cylinder: mounting the cut circular plate on a working platform of a press where a flange cylinder one-stretching die is located, and primarily stretching the circular plate by the flange cylinder one-stretching die to obtain a flange cylinder semi-finished product;
step two, stretching the cylinder again: removing the semi-finished product of the flange cylinder to a working platform of a press where a second stretching die of the flange cylinder is located, and stretching the semi-finished product of the flange cylinder again through the second stretching die of the flange cylinder to obtain the semi-finished product of the flange cylinder;
step three, flange cone stretching: removing the second semi-finished product of the flange cylinder and moving the second semi-finished product of the flange cylinder to a working platform of a press where the flange cone stretching die is located, and stretching the second semi-finished product of the flange cylinder through the flange cone stretching die to obtain a semi-finished product of the flange cone;
step four, flange special-shaped stretching: removing the flange conical semi-finished product and moving the flange conical semi-finished product to a working platform of a press machine where a flange special-shaped stretching die is located, and stretching the flange conical semi-finished product through the flange special-shaped stretching die to obtain a flange special-shaped semi-finished product;
step five, rectangular stretching at the bottom: removing the flange special-shaped semi-finished product and moving the flange special-shaped semi-finished product to a working platform of a press machine where a bottom rectangular stretching die is located, stretching the flange special-shaped semi-finished product through the bottom rectangular stretching die, increasing a pressure change force in the stretching process, and adjusting the pressure change force to 20KN-25KN to obtain a bottom rectangular stretching semi-finished product;
step six, integral shaping: and taking down the bottom rectangular stretching semi-finished product, moving the bottom rectangular stretching semi-finished product to a working platform of a press machine where the integral shaping die is located, shaping the bottom rectangular stretching semi-finished product through the integral shaping die, and obtaining a finished product of the special-shaped water gap.
2. A method of molding a profiled nozzle as claimed in claim 1, characterized in that in step five the flange profiled semifinished product is preliminarily preheated to a temperature of 150 ℃ to 250 ℃ before stretching.
3. A method of forming a profiled nozzle as claimed in claim 2, characterized in that after the stretching is completed, the bottom rectangular stretching mould is cooled down before being separated from the bottom rectangular stretching semi-finished product, at a cooling rate of 10 ℃ to 15 ℃ per ten seconds.
4. The method for molding a special-shaped nozzle of a single-process special-shaped piece mold according to claim 1, wherein the temperature difference between an upper mold and a lower mold of the flange cylinder one-drawing mold, the flange cylinder two-drawing mold, the flange conical drawing mold, the flange special-drawing mold, the bottom rectangular drawing mold and the integral shaping mold is 60 ℃ to 130 ℃, and the upper mold and the corresponding lower mold are in a constant temperature state.
5. The method for molding a special-shaped water gap by using a single-engineering special-shaped piece mold according to claim 1, wherein the surfaces of an upper mold and a lower mold of a flange cylinder one-drawing mold, a flange cylinder two-drawing mold, a flange conical drawing mold, a flange special-shaped drawing mold, a bottom rectangular drawing mold and an integral shaping mold are provided with lubricating layers, the lubricating layers comprise polyimide lubricating layers and nylon lubricating layers which are alternately arranged, and the thickness of the adjacent polyimide lubricating layers is not more than the thickness of the nylon lubricating layers and not less than one third of the thickness of the nylon lubricating layers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069535.6A CN112059018B (en) | 2020-09-30 | 2020-09-30 | Method for molding special-shaped water gap by single-engineering special-shaped piece mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011069535.6A CN112059018B (en) | 2020-09-30 | 2020-09-30 | Method for molding special-shaped water gap by single-engineering special-shaped piece mold |
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| CN112059018A CN112059018A (en) | 2020-12-11 |
| CN112059018B true CN112059018B (en) | 2024-04-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101406911A (en) * | 2008-11-24 | 2009-04-15 | 喻建鹏 | Technique for stretching workpiece with flange |
| KR101659737B1 (en) * | 2015-03-24 | 2016-09-26 | 에스테크 주식회사 | Manufacturing method of filler pipe of refill hole of automobile fuel tank and molding apparatus for the same |
| CN106583552A (en) * | 2015-10-15 | 2017-04-26 | 东莞市华世邦精密模具有限公司 | Stretching die of rectangular copper-nickel-zinc alloy product and stretching technology of stretching die |
| CN108372234A (en) * | 2018-01-18 | 2018-08-07 | 无锡曙光模具有限公司 | A kind of molding processing method of end cap and its drawing forming mold |
| CN109079028A (en) * | 2018-08-22 | 2018-12-25 | 成都同泰汽车零部件有限公司 | A kind of automotive muffler cold end Profiled double-deck shell drawing work and drawing die |
-
2020
- 2020-09-30 CN CN202011069535.6A patent/CN112059018B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101406911A (en) * | 2008-11-24 | 2009-04-15 | 喻建鹏 | Technique for stretching workpiece with flange |
| KR101659737B1 (en) * | 2015-03-24 | 2016-09-26 | 에스테크 주식회사 | Manufacturing method of filler pipe of refill hole of automobile fuel tank and molding apparatus for the same |
| CN106583552A (en) * | 2015-10-15 | 2017-04-26 | 东莞市华世邦精密模具有限公司 | Stretching die of rectangular copper-nickel-zinc alloy product and stretching technology of stretching die |
| CN108372234A (en) * | 2018-01-18 | 2018-08-07 | 无锡曙光模具有限公司 | A kind of molding processing method of end cap and its drawing forming mold |
| CN109079028A (en) * | 2018-08-22 | 2018-12-25 | 成都同泰汽车零部件有限公司 | A kind of automotive muffler cold end Profiled double-deck shell drawing work and drawing die |
Non-Patent Citations (1)
| Title |
|---|
| 阶梯矩形壳体拉伸模;刘武胜;模具工业(第02期);全文 * |
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