CN110508661B - Thin-wall annular piece forming method and die thereof - Google Patents
Thin-wall annular piece forming method and die thereof Download PDFInfo
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- CN110508661B CN110508661B CN201910821134.2A CN201910821134A CN110508661B CN 110508661 B CN110508661 B CN 110508661B CN 201910821134 A CN201910821134 A CN 201910821134A CN 110508661 B CN110508661 B CN 110508661B
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- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
- B21D26/025—Means for controlling the clamping or opening of the moulds
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- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
- B21D26/031—Mould construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
Abstract
A method of forming a thin-walled annular part, comprising the steps of: a, cutting out a rectangular material, then rolling and welding to form an annular blank, and B, providing a die, and placing the annular blank manufactured in the step A in the die for bulging processing to manufacture a semi-finished part. And step C, after the semi-finished part manufactured in the step B is subjected to solid solution stress relief and plasticity recovery, the bulging operation process in the step B is repeated for one time, shaping and shape correction are carried out, and finally, the two ends of the semi-finished part are turned to finish the machining of the finished part. The thin-wall annular part forming method provided by the invention improves the part forming precision, shortens the processing period and reduces the part cost. The invention also provides a die for the method.
Description
Technical Field
The invention relates to the technical field of sheet metal forming of machining, in particular to a forming method of a thin-wall annular part and a die used for the method.
Background
Fig. 1 is a schematic partial sectional structure view of a water accumulation cavity of an aircraft engine, and referring to fig. 1, the water accumulation cavity part is a typical thin-walled ring member 100, the wall thickness of the water accumulation cavity part is 0.8mm, the water accumulation cavity part comprises a first conical part 101, a groove part 102 and a second conical part 103 which are sequentially connected in the axial direction, the angles of the first conical part 101 and the second conical part 103 are different (8 degrees and 10 degrees respectively), the depth of the groove part 012 is about 6mm, the length L1 of the thin-walled ring member 100 in the axial direction is greater than or equal to 29mm, and the maximum diameter D1 in the radial direction is 362 mm.
In the thin-walled annular member 100 of fig. 1, the first tapered portion 101 and the second tapered portion 103 need to be vacuum-brazed after being combined with an object in subsequent assembly, and therefore, the requirements on the diameter and angular accuracy of the first tapered portion 101 and the second tapered portion 103 are high. As can be seen from fig. 1, the cross section of the thin-walled ring 100 is asymmetric in the axial direction, so that if the existing process of welding a conical ring material and then performing roll bulging forming is adopted, on one hand, the roll deformation is difficult to control; on the other hand, the size precision of the two ends after bulging is difficult to simultaneously guarantee because the springback is difficult to control.
FIG. 2 is a schematic view of a conventional process flow for preparing the water-collecting chamber of FIG. 1; referring to fig. 2, the existing processing technology needs to be divided into eleven steps: the method comprises the steps of firstly carrying out laser blanking (obtaining a disc-shaped blank with a through hole at the circle center, wherein the excircle diameter of the blank is not less than 470mm, and the inner hole diameter is not less than 20mm), secondly carrying out surface painting, thirdly carrying out deep drawing (obtaining the parting surfaces of the first conical part 101 and the groove part 102), fourthly carrying out paint removal, fifthly carrying out solid solution stress relief and plasticity recovery, sixthly carrying out shape correction and heat treatment deformation relief, two ends of a seventh walking vehicle, eighthly carrying out first spinning closing up (obtaining the parting surfaces of the second conical part 103 and the groove part 102), nineth carrying out solid solution stress relief, tenth carrying out spinning shaping, and eleventh carrying out vehicle end surface obtaining a final finished product. For the thin-wall annular part 100 shown in fig. 1, the conventional processing technology shown in fig. 2 is to spin, close and shape the small end (the first conical part 101) twice after deep drawing, and the process flow is long and the dimensional accuracy of the spun end is still difficult to meet the requirement of vacuum brazing.
Disclosure of Invention
The present invention is directed to a method and a mold for forming a thin-walled annular part, which reduces or avoids the above-mentioned problems.
In order to solve the technical problem, the invention provides a method for forming a thin-wall annular part, wherein the thin-wall annular part has a wall thickness of 0.8mm, and comprises a first conical part, a groove part and a second conical part which are sequentially connected in the axial direction, angles of the first conical part and the second conical part are different, the length of the thin-wall annular part in the axial direction is more than or equal to 29mm, and the maximum diameter of the thin-wall annular part in the radial direction is 362mm, and the method comprises the following steps:
a, cutting a rectangular material from a plate with the thickness of 0.8mm, then rolling and welding to form an annular blank, wherein the height of the annular blank is 60mm, the diameter of the annular blank is 335mm, and then carrying out solid solution to eliminate stress so as to keep the structural property of the material uniform.
Step B, providing a die, wherein the die comprises an upper template and a lower template; the lower die plate is fixedly connected with a lower female die, the bottom of an inner cavity of the lower female die is fixedly clamped by a rubber bag mounting ring, the bottom of the lower female die is provided with a liquid filling port and an exhaust port communicated with the inside of the rubber bag, the inside of the rubber bag is provided with a vent pipe communicated with the exhaust port, the upper part of the lower female die is detachably connected with an upper female die, the upper female die is formed by splicing two symmetrical half-block structures, the upper die plate is fixedly connected with a locking female die used for fixing the upper female die, an expansion limiting plate used for being inserted into a cavity of the upper female die is fixedly connected in the cavity of the locking female die, and a locking limiting ring is arranged outside the expansion limiting plate,
before processing, water is injected into the rubber bag through the liquid filling port, after the water flow stably flows out from the exhaust port, the water injection is stopped, and the sealing bolt is locked, at the moment, the water pressure in the rubber bag does not enable the rubber bag to deform, and repeated water injection is not needed during continuous processing. And B, then placing the annular blank manufactured in the step A into the lower female die, sleeving the annular blank outside the rubber bag, confirming that the annular blank is basically flush with the top of the rubber bag, and then folding the two half structures of the upper female die. And then the upper template descends, and the upper female die is locked through the locking female die. And then pressurizing and maintaining the pressure of the upper template, and then increasing the water pressure in the rubber bag until the preliminary bulging of the part is completed. And (3) after bulging, enabling the water pressure in the rubber bag to retreat and reduce the pressure, decomposing the two half structures of the upper female die after the upper die moves upwards, and taking out the semi-finished parts.
And step C, after the semi-finished part manufactured in the step B is subjected to solid solution stress relief and plasticity recovery, the bulging operation process in the step B is repeated, shaping and shape correction are carried out, and finally, the two ends of the semi-finished part are turned to finish the machining of the finished part.
Preferably, in the step B, an annular groove is formed in the bottom of the lower female die, the rubber bag mounting ring is arranged in the annular groove, and a limit ring is further arranged between the rubber bag mounting ring and the lower female die, so that damage caused by excessive deformation of the mounting edge of the rubber bag during high-pressure bulging can be prevented. The rubber bag mounting ring compresses the mounting edge of the rubber bag through screws penetrating through the lower template, the lower female die and the limiting ring, and presses the side face of the rubber bag.
Preferably, in the step B, a gap of 1-2mm is reserved between the top end of the vent pipe and the rubber bag.
Preferably, in step B, the upper female die is further provided with a guide block, so that after the two half structures of the upper female die are placed on the lower female die, the two half structures can be initially guided and positioned by the guide block and the lower female die.
Preferably, in the step B, the locking limit ring is fixed to the upper mold plate and the locking female mold through screws, so that the locking female mold can be prevented from being damaged or deformed due to excessive stress.
Preferably, in step B, when the mold is in the mold clamping state, the lower surface of the bulging limit plate is attached to or maintains a gap of about 1mm with the upper surface of the rubber bladder.
The invention also provides a die for the method, which comprises an upper template and a lower template; the improved die is characterized in that a lower die is fixedly connected to the lower die plate, a rubber bag is fixedly clamped at the bottom of an inner cavity of the lower die plate through a rubber bag mounting ring, a liquid filling port and an exhaust port communicated with the inside of the rubber bag are formed in the bottom of the lower die plate, a vent pipe communicated with the exhaust port is arranged inside the rubber bag, an upper die is arranged above the lower die, the upper die is formed by splicing two symmetrical half-block structures, the upper die plate is fixedly connected with a locking die of the upper die, a bulging limiting plate inserted into a cavity of the locking die is fixedly connected with the inside of the cavity of the upper die, a locking limiting ring is arranged outside the bulging limiting plate, and a molded surface corresponding to the thin-wall ring-shaped piece is arranged in the cavity of the lower die plate and the.
Preferably, an annular groove is formed in the bottom of the lower female die, the rubber bag mounting ring is arranged in the annular groove, and a limiting ring is further arranged between the rubber bag mounting ring and the lower female die.
Preferably, a gap of 1-2mm is reserved between the top end of the vent pipe and the rubber bag.
Preferably, when the die is in a die closing state, the lower surface of the bulging limit plate is attached to or maintains a clearance of about 1mm with the upper surface of the rubber bag.
The thin-wall annular part forming method provided by the invention improves the part forming precision, shortens the processing period and reduces the part cost. The invention also provides a die for the method.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,
FIG. 1 is a schematic illustration in partial cross-sectional view of a water collection chamber of an aircraft engine;
FIG. 2 is a schematic view of a conventional process flow for preparing the water-collecting chamber of FIG. 1;
FIG. 3 is a schematic process flow diagram of a method of forming a thin-walled annular part according to an embodiment of the invention;
fig. 4 is a schematic cross-sectional structural view of the mold of fig. 3.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
FIG. 1 is a schematic illustration in partial cross-sectional view of a water collection chamber of an aircraft engine; FIG. 3 is a schematic process flow diagram of a method of forming a thin-walled annular part according to an embodiment of the invention; fig. 4 is a schematic cross-sectional structural view of the mold of fig. 3. Referring to fig. 1, 3 and 4, the present invention provides a thin-walled ring-shaped member forming method, wherein the thin-walled ring-shaped member 100 has a wall thickness of 0.8mm, and comprises a first tapered portion 101, a groove portion 102 and a second tapered portion 103 which are sequentially connected in an axial direction, angles of the first tapered portion 101 and the second tapered portion 103 are different, a length L1 of the thin-walled ring-shaped member 100 in the axial direction is equal to or greater than 29mm, and a maximum diameter D1 in a radial direction is 362mm, the method comprising the steps of:
a, cutting a rectangular material from a plate with the thickness of 0.8mm, rolling and welding to form an annular blank, wherein the height H1 of the annular blank is 60mm, the diameter D2 is 335mm, then carrying out solid solution to eliminate stress and keep the material structure performance uniform,
step B, providing a mold 200, wherein the mold 200 comprises an upper template 7 and a lower template 1; the lower die plate 7 is fixedly connected with a lower female die 2, the bottom of the inner cavity of the lower female die 2 is fixedly clamped by a rubber bag mounting ring 12, a liquid filling port and an exhaust port communicated with the interior of the rubber bag 6 are arranged at the bottom of the lower female die 2, a vent pipe 8 communicated with the exhaust port is arranged in the interior of the rubber bag 6, an upper female die 3 is detachably connected above the lower female die 2, the upper female die 3 is formed by splicing two symmetrical half-block structures, a locking female die 4 used for fixing the upper female die 3 is fixedly connected with the upper die plate 7, an expansion limiting plate 9 used for being inserted into the cavity of the upper female die 3 is fixedly connected in the cavity of the locking female die 4, and a locking limiting ring 10 is arranged outside the expansion limiting plate 9,
and B, placing the annular blank manufactured in the step A into the lower female die 2, sleeving the annular blank outside the rubber bag 6, confirming that the annular blank is basically flush with the top of the rubber bag 6, and then folding the two half structures of the upper female die 3. And then the upper template 7 moves downwards, and the upper concave die 3 is locked through the locking concave die 4. And then connecting the liquid filling port with a water outlet pipe (not shown) of a numerical control liquid filling forming machine, and loosening the exhaust port sealing bolt. And starting a numerical control liquid filling forming machine to inject water into the rubber bag 6 through a liquid filling opening, stopping injecting water and locking a sealing bolt (not shown in the figure) after water flows stably flow out of an exhaust opening, wherein at the moment, the water pressure in the rubber bag 6 does not deform the rubber bag 6 (the water injection process only needs to be carried out during first piece processing, water injection does not need to be repeated during subsequent continuous processing, the sealing bolt is loosened for drainage after all parts are processed), then pressurizing and pressure maintaining are carried out by the upper template 7, the numerical control liquid filling forming machine is started to increase the water pressure in the rubber bag 6, and the preliminary bulging of the parts is completed after the water pressure determined in advance through tests (used for ensuring that enough pressure causes the parts. And (3) after the bulging, retreating a piston of a pressure cylinder of the numerical control liquid-filling forming machine, retreating and decompressing the water pressure in the rubber bag 6 to the initial pressure of the rubber bag 6 without deformation, decomposing the two half structures of the upper female die 3 after the upper die moves upwards, and taking out the semi-finished parts.
The present invention may utilize an existing digitally controlled liquid-filled forming machine (e.g., Henan Xingdi forging and stamping equipment, Inc.: XD-SHF sheet material liquid-filled forming equipment) to achieve pressure control of the liquid flow. The present invention is essentially different from the existing numerical control liquid-filled forming machines (liquid-filled forming machines are usually used for deep drawing) in the expanding process and principle of a specific die, but for the liquid flow control function, the functions of the existing commercial equipment can be utilized.
The bottom of the lower female die 2 is provided with an annular groove, the rubber bag mounting ring 12 is arranged in the annular groove, and the limiting ring 13 is further arranged between the rubber bag mounting ring 12 and the lower female die 2, so that damage caused by excessive deformation of the mounting edge of the rubber bag 6 during high-pressure bulging can be prevented. The rubber bag mounting ring 12 compresses the mounting edge of the rubber bag 6 through screws penetrating through the lower template 1, the lower female die 2 and the limiting ring 13, and presses the side surface. The wall thickness of the rubber bag 6 can be 3mm, and the gap between the rubber bag mounting ring 12 and the side wall of the lower female die 2 can be 2.5mm, so that the tight mounting of the rubber bag 6 can be ensured.
A gap of 1-2mm is reserved between the top end of the vent pipe 8 and the rubber bag 6;
the upper female die 3 is also provided with a guide block 11, so that after the two half structures of the upper female die 3 are arranged on the lower female die 2, the two half structures can be initially guided and positioned by the guide block 11 and the lower female die 2;
the locking limiting ring 10 is fixed with the upper template 7 and the locking female die 4 through screws, so that the locking female die 4 can be prevented from being damaged or deformed due to overlarge stress.
When the die 200 is in a die assembly state, the lower surface of the bulging limit plate 9 is attached to the upper surface of the rubber bag 6 or a clearance of about 1mm is kept.
As shown in fig. 3 and 4, the cavities of the lower die 2 and the upper die 3 are provided with profiles corresponding to the thin-walled ring member 100, so that the ring-shaped blank can be formed by hydraulic pressure.
And step C, after the semi-finished part manufactured in the step B is subjected to solid solution stress relief and plasticity recovery, the bulging operation process in the step B is repeated, shaping and shape correction are carried out, and finally, the two ends of the semi-finished part are turned to finish the machining of the finished part.
The invention also provides a die 200 for the method, which comprises an upper template 7 and a lower template 1; the lower die plate 7 is fixedly connected with a lower female die 2, the bottom of the inner cavity of the lower female die 2 is fixedly clamped by a rubber bag mounting ring 12, a liquid filling port and an exhaust port communicated with the interior of the rubber bag 6 are arranged at the bottom of the lower female die 2, a vent pipe 8 communicated with the exhaust port is arranged in the interior of the rubber bag 6, an upper female die 3 is detachably connected above the lower female die 2, the upper female die 3 is formed by splicing two symmetrical half-block structures, a locking female die 4 used for fixing the upper female die 3 is fixedly connected with the upper die plate 7, an expansion limiting plate 9 used for being inserted into the cavity of the upper female die 3 is fixedly connected in the cavity of the locking female die 4, and a locking limiting ring 10 is arranged outside the expansion limiting plate 9,
the bottom of the lower female die 2 is provided with an annular groove, the rubber bag mounting ring 12 is arranged in the annular groove, and the limiting ring 13 is further arranged between the rubber bag mounting ring 12 and the lower female die 2, so that damage caused by excessive deformation of the mounting edge of the rubber bag 6 during high-pressure bulging can be prevented. The rubber bag mounting ring 12 compresses the mounting edge of the rubber bag 6 through screws penetrating through the lower template 1, the lower female die 2 and the limiting ring 13, and presses the side surface.
A gap of 1-2mm is reserved between the top end of the vent pipe 8 and the rubber bag 6;
the upper female die 3 is also provided with a guide block 11, so that after the two half structures of the upper female die 3 are arranged on the lower female die 2, the two half structures can be initially guided and positioned by the guide block 11 and the lower female die 2;
the locking limiting ring 10 is fixed with the upper template 7 and the locking female die 4 through screws, so that the locking female die 4 can be prevented from being damaged or deformed due to overlarge stress.
When the die 200 is in a die assembly state, the lower surface of the bulging limit plate 9 is attached to the upper surface of the rubber bag 6 or a clearance of about 1mm is kept.
The forming method of the thin-wall annular part provided by the invention realizes the precise forming processing of the thin-wall annular part with the radial groove, improves the forming precision of parts, shortens the processing period and reduces the cost of the parts. The invention also provides a die for the method.
Compared with the prior production process recorded in the background technology section, the technical scheme of the invention is to reduce the original 11 processing procedures into 8 processing procedures, and the processing period is shortened by more than 1/4. Meanwhile, the utilization rate of the material is improved by more than 50 percent (8 pieces are processed by a 1000 multiplied by 2000 plate drawing process, 16 pieces can be processed by the scheme of the invention, and 950 multiplied by 1000 large plates can be left for use).
The technical scheme of the invention is also suitable for the precise bulging processing of thin-wall straight walls and conical ring-shaped pieces.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (10)
1. A method for forming a thin-walled annular member having a wall thickness of 0.8mm and including a first tapered portion, a groove portion, and a second tapered portion connected in this order in an axial direction, the first tapered portion and the second tapered portion having different angles, the thin-walled annular member having a length in the axial direction of 29mm or more and a maximum diameter in the radial direction of 362mm, the method comprising the steps of:
a, cutting a rectangular material from a plate with the thickness of 0.8mm, rolling and welding to form an annular blank, wherein the height of the annular blank is 60mm, the diameter of the annular blank is 335mm, then carrying out solid solution to eliminate stress and keep the material structure property uniform,
step B, providing a die, wherein the die comprises an upper template and a lower template; the lower die plate is fixedly connected with a lower female die, the bottom of an inner cavity of the lower female die is fixedly clamped by a rubber bag mounting ring, the bottom of the lower female die is provided with a liquid filling port and an exhaust port communicated with the inside of the rubber bag, the inside of the rubber bag is provided with a vent pipe communicated with the exhaust port, the upper part of the lower female die is detachably connected with an upper female die, the upper female die is formed by splicing two symmetrical half-block structures, the upper die plate is fixedly connected with a locking female die used for fixing the upper female die, an expansion limiting plate used for being inserted into a cavity of the upper female die is fixedly connected in the cavity of the locking female die, and a locking limiting ring is arranged outside the expansion limiting plate,
injecting water into the rubber bag through a liquid filling port before processing, stopping injecting water and locking a sealing bolt after water flows flow stably flows out from an exhaust port, ensuring that the rubber bag is not deformed by the water pressure in the rubber bag at the moment, avoiding repeated water injection during continuous processing, placing the annular blank manufactured in the step A into the lower female die, sleeving the annular blank outside the rubber bag, ensuring that the annular blank is basically flush with the top of the rubber bag, folding the two half-block structures of the upper female die, descending the upper die plate, locking the upper female die through the locking female die, pressurizing and maintaining the upper die plate, increasing the water pressure in the rubber bag until the primary bulging of the part is completed, returning and decompressing the water pressure in the rubber bag after the bulging, decomposing the two half-block structures of the upper female die after the upper die ascends, and taking out a semi-finished part,
and step C, after the semi-finished part manufactured in the step B is subjected to solid solution stress relief and plasticity recovery, the bulging operation process in the step B is repeated, shaping and shape correction are carried out, and finally, the two ends of the semi-finished part are turned to finish the machining of the finished part.
2. The method according to claim 1, wherein in step B, an annular groove is formed at the bottom of the lower female die, the rubber bag mounting ring is arranged in the annular groove, a limit ring is further arranged between the rubber bag mounting ring and the lower female die, so that damage caused by excessive deformation of the mounting edge of the rubber bag during high-pressure bulging can be prevented, and the rubber bag mounting ring presses the mounting edge of the rubber bag through screws penetrating through the lower template, the lower female die and the limit ring and presses the side surface of the rubber bag.
3. The method of claim 1, wherein in step B, the tip of the ventilation tube is spaced from the rubber bladder by 1-2 mm.
4. The method according to claim 1, wherein in step B, the upper female die is further provided with a guide block, so that after the two half structures of the upper female die are placed on the lower female die, the two half structures of the upper female die can be initially guided and positioned with the lower female die through the guide block.
5. The method according to claim 1, wherein in the step B, the locking limiting ring is fixed with the upper template and the locking female die through screws, so that the locking female die can be prevented from being damaged or deformed by excessive stress.
6. The method according to claim 1, wherein in step B, when the mold is in a closed state, the lower surface of the bulging limit plate is fitted to or kept at a 1mm gap from the upper surface of the rubber bladder.
7. A mold for use in the method of claim 1, comprising an upper mold plate and a lower mold plate; the improved die is characterized in that a lower die is fixedly connected to the lower die plate, a rubber bag is fixedly clamped at the bottom of an inner cavity of the lower die plate through a rubber bag mounting ring, a liquid filling port and an exhaust port communicated with the inside of the rubber bag are formed in the bottom of the lower die plate, a vent pipe communicated with the exhaust port is arranged inside the rubber bag, an upper die is detachably connected to the upper side of the lower die, the upper die plate is formed by splicing two symmetrical half-block structures, the upper die plate is fixedly connected with a locking die of the upper die plate, a bulging limiting plate inserted into a cavity of the locking die plate is fixedly connected with the interior of the cavity of the upper die plate, a locking limiting ring is arranged on the exterior of the bulging limiting plate, and a molded surface corresponding to the thin-wall ring piece is arranged in.
8. The mold according to claim 7, wherein an annular groove is formed in the bottom of the lower female mold, the rubber bag mounting ring is arranged in the annular groove, and a limiting ring is further arranged between the rubber bag mounting ring and the lower female mold.
9. The mold of claim 7, wherein the top end of the vent tube is spaced from the rubber bladder by a distance of 1-2 mm.
10. The mold of claim 7, wherein the lower surface of the bulging limit plate is in contact with or maintains a 1mm gap with the upper surface of the rubber bladder when the mold is in the closed state.
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| CN111001700B (en) * | 2019-12-30 | 2021-01-15 | 北京航空航天大学 | 3D hydraulic forming method for special-shaped sealing ring of aero-engine |
| CN112122438A (en) * | 2020-09-18 | 2020-12-25 | 中国航发沈阳黎明航空发动机有限责任公司 | Thin-wall sheet metal part liquid filling forming die and method |
| CN115608838B (en) * | 2022-12-19 | 2023-04-07 | 天津伍玥航空科技有限公司 | Forming process of multi-way pipe fitting |
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| CN105234242A (en) * | 2015-11-16 | 2016-01-13 | 宁波工程学院 | In-pipe Rubber bladder hydraulic forming device |
| CN208067056U (en) * | 2018-04-16 | 2018-11-09 | 广东永力泵业有限公司 | A kind of centrifugal pump casing hydraulic pressure bulging equipment |
| CN208613468U (en) * | 2018-06-22 | 2019-03-19 | 西安飞机工业（集团）有限责任公司 | A kind of whole shaping dies of thin-walled spherical part |
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