CN214108447U - Positive and negative superplastic forming die of titanium alloy hemispherical structure - Google Patents
Positive and negative superplastic forming die of titanium alloy hemispherical structure Download PDFInfo
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- CN214108447U CN214108447U CN202021505106.4U CN202021505106U CN214108447U CN 214108447 U CN214108447 U CN 214108447U CN 202021505106 U CN202021505106 U CN 202021505106U CN 214108447 U CN214108447 U CN 214108447U
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Abstract
The utility model relates to a titanium alloy semispherical structure positive and negative superplastic forming die, which comprises an upper die and a lower die; the upper die is provided with an annular cavity, and the lower die is provided with a hemispherical cavity; the center of the annular cavity of the upper die is provided with a vent hole for reverse superplastic forming, and the bottom of the lower die is provided with a vent hole for forward superplastic forming; the upper die and the lower die are sealed through a groove with a blank holder and a blank holder convex rib.
Description
Technical Field
The utility model relates to the technical field of machining, and in particular to positive and negative superplastic forming die of titanium alloy hemispherical structure.
Background
The micro-nano satellite is an important direction for the development of the current satellite, has the advantages of high functional density and technical performance, low investment and operation cost, strong flexibility, short system construction period, small risk and the like, can further realize certain tasks which are difficult to realize by the current large satellite through a distributed constellation, is widely applied to various fields such as data communication, data transmission, ground environment monitoring, space environment monitoring scientific experiments and the like, has great influence on the fields of world science and technology, economy and military, and is generally valued by all national aviation universes in the world.
The titanium alloy spherical storage tank is a common fuel storage container for a Vena satellite, and because the yield ratio of the titanium alloy is large, the titanium alloy spherical storage tank is difficult to form by normal-temperature plastic processing. At present, titanium alloy hemispheres are mainly manufactured by adopting a forging and machining mode, and have the problems of low material utilization rate, more working procedures, long manufacturing period and the like, so that a low-cost rapid forming method is urgently needed to be found.
The positive and negative superplastic forming is a titanium alloy hemisphere structure precision forming technology, and the basic idea is to adopt an upper die and a lower die with different cavities, reduce the sheet thinning rate and improve the forming capability through a positive and negative superplastic forming mode, thereby realizing the titanium alloy hemisphere precision forming.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be: the utility model discloses aim at solving titanium alloy hemisphere and forge + the manufacturing of machine tooling mode, have that material utilization is low, process is in large quantity, manufacturing cycle length scheduling problem. The utility model provides a positive and negative superplastic forming die of titanium alloy hemispherical structure.
The utility model provides a technical scheme be: a positive and negative superplastic forming die of a titanium alloy semispherical structure comprises an upper die and a lower die; the upper die is provided with an annular cavity, and the lower die is provided with a hemispherical cavity; the center of the annular cavity of the upper die is provided with a vent hole for reverse superplastic forming, and the bottom of the lower die is provided with a vent hole for forward superplastic forming; the upper die and the lower die are sealed through a groove with a blank holder and a blank holder convex rib.
Preferably, the groove with the blank pressing edge is arranged on the periphery of the annular chamber; the edge pressing convex ribs are arranged around the hemispherical cavity.
Preferably, the groove is of a continuous uniform cross-section structure, and the distance between the central line of the groove and the two ends of the edge of the mold is not less than 15 mm; the convex rib is of a continuous uniform cross-section structure, and the distance between the central line of the convex rib and the two ends of the edge of the die is not less than 15 mm.
Preferably, the vent hole in the center of the annular cavity of the upper die is coincident with the axis of the vent hole in the bottom of the lower die.
Preferably, the outer diameter of the annular cavity is not less than the diameter of the hemispherical cavity, and the distance between the outer diameter of the annular cavity and the edge of the die is not less than 40 mm; the annular chamber inner diameter is no less than 1/4 and no greater than 1/2 of the hemispherical chamber diameter.
Preferably, the outer edge of the hemispherical cavity is rounded.
Preferably, the diameters of the air inlets on the upper die and the lower die are not less than 3mm, and the distance between the centers of the air inlets and the edges of the dies is not less than 15 mm.
Preferably, the upper die and the lower die are made of heat-resistant stainless steel materials including 0Cr25Ni20Si2 or ZG35Cr24Ni7 SiN.
Preferably, the mold profiles of the upper and lower molds are obtained by casting and then machined to the target profiles.
Preferably, the dimensions of the upper and lower die profiles are designed to take into account the difference in thermal expansion coefficient between the die material and the material of the part being formed at the target forming temperature.
Compared with the prior art, the utility model beneficial effect be:
the utility model discloses the mould can change grow aspect ratio titanium alloy hemispherical structure part wall thickness evenly distributed degree, realizes the accurate shaping of titanium alloy hemispherical structure.
The utility model discloses the mould can be through reverse superplastic and forward superplastic realization titanium alloy hemisphere structure precision forming, improve material utilization by a wide margin, shorten the shaping time, improve the shaping quality by a wide margin.
Drawings
Fig. 1 is a schematic view of the mold of the present invention.
Detailed Description
The present invention will be further explained with reference to the following examples.
Fig. 1 is a schematic structural view of a titanium alloy hemispherical structure positive and negative superplastic forming die of the present invention.
The positive and negative superplastic forming die of the titanium alloy hemispherical structure comprises: an upper die 1 and a lower die 2; the periphery of the upper die 1 is provided with a flanged groove, and the middle area is provided with an annular cavity for reverse superplastic forming of a titanium alloy hemisphere; the periphery of the lower die 2 is provided with blank pressing convex ribs, and the middle area is a hemisphere cavity used for forward superplastic forming of a titanium alloy hemisphere.
The upper die 1 and the lower die 2 are made of high-temperature resistant materials, and can be made of heat-resistant stainless steel such as 0Cr25Ni20Si2, ZG35Cr24Ni7SiN and the like.
The molded surfaces of the upper die 1 and the lower die 2 are generally obtained by casting to obtain the molded surface of the die, and then the molded surface is processed to the target molded surface, so that the material consumption is reduced, and the processing cost is reduced.
The design of the sizes of the molded surfaces of the upper die 1 and the lower die 2 needs to take the difference of the thermal expansion coefficients between the die material and the formed part material at the target forming temperature into consideration, and the size of the die is corrected when the die is designed.
The diameters of the air inlets on the upper die 1 and the lower die 2 are generally not less than 3mm, and the distance between the centers of the air inlets and the edges of the dies is not less than 15 mm.
The shape and the depth of the cross section of the annular cavity on the upper die 1 can be designed according to simulation calculation, the outer diameter of the annular cavity is generally not smaller than the diameter of the hemispherical cavity, and the distance between the annular cavity and the edge of the die is not smaller than 40 mm; the annular chamber inner diameter is generally no less than 1/4 and no greater than 1/2 of the hemispherical chamber diameter.
The groove on the upper die 1 is of a continuous uniform cross-section structure, and the distance between the central line of the groove and the two ends of the edge of the die is not less than 15 mm.
The convex rib on the lower die 2 is of a continuous uniform cross-section structure, and the distance between the central line of the convex rib and the two ends of the edge of the die is not less than 15 mm.
The positive and negative superplastic forming method of the titanium alloy hemispherical structure comprises the steps of assembling, vacuumizing, heating, reverse superplastic forming, positive superplastic forming, cooling and the like. The assembly is that titanium alloy blanks are placed on the lower die 2, the upper die 1 is hoisted to the titanium alloy blanks, and the convex ribs and the grooves of the upper die and the lower die are sealed under the pressure action of the upper platform; the vacuum pumping is realized by pumping the interior of the forming chamber of the equipment to 10 by combining a multi-stage pump-3Pa; heating is to enable the temperature of the titanium alloy blank to reach 920 +/-10 ℃ in a step heating mode; the reverse superplastic forming is that argon gas with 3.5-4.0MPa is introduced into the air hole at the bottom of the lower die 2 to force the titanium alloy blank to deform upwards until the titanium alloy blank is attached to the molded surface of the upper die 1; the forward superplastic forming is that 3.5-4.0MPa of argon is introduced into the air hole at the top of the upper die 1 after the reverse superplastic forming is finished, so that the titanium alloy blank is forced to deform downwards until the titanium alloy blank is attached to the molded surface of the lower die 2; and the cooling is to cool the workpiece to 200 ℃ along with the furnace, then open the furnace door for air cooling, and take out the part when the temperature reaches 60 ℃.
To sum up, utilize the embodiment of the utility model provides a positive and negative superplastic forming die of titanium alloy hemisphere structure can realize the precision forming of titanium alloy hemisphere, improves material utilization by a wide margin, shortens the shaping time, improves the shaping quality by a wide margin.
Although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the above-mentioned method and technical contents to make possible changes and modifications to the technical solution of the present invention without departing from the spirit and scope of the present invention, therefore, any simple modification, equivalent changes and modifications made to the above embodiments by the technical substance of the present invention all belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a positive and negative superplastic forming die of titanium alloy hemisphere structure which characterized in that: comprises an upper die and a lower die; the upper die is provided with an annular cavity, and the lower die is provided with a hemispherical cavity; the center of the annular cavity of the upper die is provided with a vent hole for reverse superplastic forming, and the bottom of the lower die is provided with a vent hole for forward superplastic forming; the upper die and the lower die are sealed through a groove with a blank holder and a blank holder convex rib.
2. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the groove with the blank pressing is arranged on the periphery of the annular cavity; the edge pressing convex ribs are arranged around the hemispherical cavity.
3. The positive and negative superplastic forming die of titanium alloy semispherical structure according to claim 2, characterized in that: the groove is of a continuous uniform cross-section structure, and the distance between the central line of the groove and the two ends of the edge of the die is not less than 15 mm; the convex rib is of a continuous uniform cross-section structure, and the distance between the central line of the convex rib and the two ends of the edge of the die is not less than 15 mm.
4. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the vent hole in the center of the upper die annular cavity is superposed with the axis of the vent hole at the bottom of the lower die.
5. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the outer diameter of the annular cavity is not smaller than the diameter of the hemispherical cavity, and the distance between the annular cavity and the edge of the die is not smaller than 40 mm; the annular chamber inner diameter is no less than 1/4 and no greater than 1/2 of the hemispherical chamber diameter.
6. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the outer edge of the hemispherical cavity is rounded.
7. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the diameter of the air inlet on the upper die and the lower die is not less than 3mm, and the distance between the center of the air inlet and the edge of the die is not less than 15 mm.
8. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: the upper die and the lower die are made of heat-resistant stainless steel materials, and the heat-resistant stainless steel materials are 0Cr25Ni20Si2 or ZG35Cr24Ni7 SiN.
9. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1, characterized in that: and obtaining the die profiles of the upper die and the lower die by a casting mode, and then processing the die profiles to the target profiles.
10. The positive and negative superplastic forming die of a titanium alloy semispherical structure according to claim 1 or 9, characterized in that: the size of the molded surfaces of the upper die and the lower die takes the difference of the thermal expansion coefficients between the die material and the formed part material at the target forming temperature into consideration on the basis of the design size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021505106.4U CN214108447U (en) | 2020-07-27 | 2020-07-27 | Positive and negative superplastic forming die of titanium alloy hemispherical structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021505106.4U CN214108447U (en) | 2020-07-27 | 2020-07-27 | Positive and negative superplastic forming die of titanium alloy hemispherical structure |
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| CN214108447U true CN214108447U (en) | 2021-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713698A (en) * | 2022-04-07 | 2022-07-08 | 大连理工大学 | Method for controlling inflation position to form thin-wall metal component |
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2020
- 2020-07-27 CN CN202021505106.4U patent/CN214108447U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713698A (en) * | 2022-04-07 | 2022-07-08 | 大连理工大学 | Method for controlling inflation position to form thin-wall metal component |
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