A method and mold structure for hydraulically forming rubber bladders of rotating parts

Abstract

The present invention relates to the field of precision sheet metal processing technology, and in particular to a method and mold structure for hydraulically forming a rubber bag of a rotating body part, comprising a forming frame, a rubber bag sealing ring, a rubber bag, and a through cavity, wherein the forming frame is a cylindrical structure, the forming frame coaxially opens a cylindrical through cavity, the inner wall of the through cavity is fixedly connected to the rubber bag, the upper end of the rubber bag is provided with an injection port, the rubber bag injection port is fixedly connected to a rubber bag sealing ring, and the outer periphery of the rubber bag sealing ring is fixedly connected to the inner wall of the through cavity. The shortcomings of inadequate forming, cracking, and too low strength of sheet metal in the process of pressing sheet metal under traditional forming process methods are solved, and the yield rate of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of precision sheet metal processing, and in particular to a method and a mold structure for hydraulically forming a rubber bag of a rotating body part. Background Art

[0002] In accordance with the requirements of aviation and aerospace for high reliability, high safety and light weight of parts performance, strict requirements are put forward for the integrity of sheet metal parts structure, structural reliability and material utilization. The new thin-walled components and complex parts formed by traditional forming process methods may have the risk of rupture, and may also have shortcomings such as low strength and inadequate forming. Therefore, a new forming technology is urgently needed. Summary of the invention

[0003] The embodiment of the present application provides a method and mold structure for hydraulic forming of rubber bags of rotating body parts, which solves the shortcomings of inadequate sheet forming, cracking, and low strength during sheet pressing under traditional forming process methods, thereby improving the yield of the device.

[0004] The present application provides a method for hydraulically forming a rubber bag of a rotating body part, comprising the following steps:

[0005] S1. Sheet placement: Place the sheet on the die base and cover it with a layer of polyurethane pad;

[0006] S2. Parameter adjustment: adjust the clamping force of the forming frame and the drawing frame to 100T, and then fill the rubber bag with oil and pressurize it to 2Mpa;

[0007] S3, sheet metal pressing: the ejector cylinder drives the punch to push upwards. Under the action of the hydraulic pressure inside the rubber bag, the upward force of the ejector cylinder acts on the polyurethane pad and the sheet metal, driving the sheet metal to deform;

[0008] S4, pressurization: Continue to increase the pressure in the rubber bag, and at the same time, the ejector cylinder slowly pushes up. Finally, the pressure of the rubber bag stabilizes at about 10Mpa, the ejector cylinder moves up to a height of about 300mm, and the pressure is maintained for 30s;

[0009] S5. Take out the material: After the deep drawing is completed, the rubber bag is slowly depressurized. When there is no pressure in the rubber bag, the rubber bag is separated from the formed part, and then the ejector cylinder slowly falls down. Then the press is opened to remove the mold and take out the formed part.

[0010] A rubber bag hydraulic forming die structure for a rotary body part, comprising a forming frame, a rubber bag sealing ring, a rubber bag, and a through cavity;

[0011] The forming frame is a cylindrical structure, and the forming frame is coaxially provided with a cylindrical through cavity;

[0012] The inner wall of the through cavity is fixedly connected to a rubber bag, and an injection port is provided at the upper end of the rubber bag;

[0013] A rubber bag sealing ring is fixedly connected to the rubber bag injection port, and the outer periphery of the rubber bag sealing ring is fixedly connected to the inner wall of the through cavity.

[0014] Furthermore, the rotary body part rubber bag hydraulic forming die structure also includes a drawing frame, a movement cavity, a die base, an upper displacement cavity, a lower displacement cavity, and an ejection cylinder;

[0015] The drawing frame is cylindrical, and a cylindrical groove is coaxially provided on the upper end of the drawing frame;

[0016] A cylindrical die seat is movably connected in the groove of the drawing frame;

[0017] A cylindrical upper displacement cavity is coaxially provided at the upper end of the mold base;

[0018] A cylindrical lower displacement cavity is coaxially provided at the lower end of the mold;

[0019] The ejector cylinder is composed of a cylindrical ejector rod and a punch. The ejector cylinder passes through the die base. The ejector rod of the ejector cylinder is slidably connected to the lower displacement cavity, and the punch of the ejector cylinder is slidably connected to the upper displacement cavity.

[0020] A cylindrical movement cavity is coaxially formed at the lower end of the drawing frame, and the movement cavity is slidably connected with the ejector rod portion of the ejection cylinder.

[0021] Furthermore, the radius of the through cavity is the same as the radius of the groove coaxially opened at the upper end of the drawing frame.

[0022] Furthermore, the size of the upper displacement cavity is the same as the size of the lower displacement cavity.

[0023] Furthermore, a nylon ring is movably connected to the upper end surface of the mold base. The nylon ring is in a circular ring shape as a whole, and the hypotenuse and bevel of the nylon ring are triangular. A platform of about 2-5mm is machined at the end point of the hypotenuse of the nylon ring to fit tightly with the mold base to prevent extrusion and dislocation when the rubber bag is pressurized.

[0024] Furthermore, a cylindrical polyurethane pad is movably mounted on the upper end surface of the mold base. When a sheet is placed on the upper end surface of the mold base, the polyurethane pad is placed above the sheet. The polyurethane pad uses its own elasticity to prevent damage to the material when it is squeezed, and prevents the rubber bag from being scratched and broken.

[0025] Furthermore, two lifting holes are symmetrically provided on the upper end surface of the die base, and the lifting holes are used to lift the die base into the groove provided in the drawing frame. When pressing the sheet material, a hole cone is inserted into the lifting hole to prevent the existence of grooves on the upper end surface of the die base and scratching the rubber bag.

[0026] Furthermore, the through cavity is equidistantly fixed with a plurality of rubber bags;

[0027] A pressure injection port is provided on the top of each rubber bag, and each rubber bag is externally connected to a pressure sensor.

[0028] Furthermore, the liquid injected into each of the rubber bags is an electrorheological fluid;

[0029] The electrorheological fluid in each rubber bag can be pressurized before being electrically hardened, and can have a shaping effect on the sheet material after being electrically hardened;

[0030] The electrorheological fluid is connected to an external power source through a wire. When the rubber bag and the electrorheological fluid are completely in contact with the surface of the sheet, electricity is supplied to the electrorheological fluid to harden it. The hardened electrorheological fluid can cooperate with the extrusion force of the punch to fully deform the sheet.

[0031] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0032] First, a rubber bag is used as a concave die, and the pressure generated by the hydraulic oil is used as the force transmission medium. Through the hydraulic action, the metal sheet is gradually covered on the rigid punch, so that the shaping of the material can be fully exerted, the damage rate inside the material is greatly reduced, and the sheet material is prevented from wrinkling, cracking, and excessive thinning.

[0033] Secondly, by fixing multiple rubber bags at equal distances in the through cavity and opening an injection port and a pressure sensor above each rubber bag, multiple rubber bags can be individually injected and pressed according to the shape of the formed parts, so that the rubber bags and the punch press the sheet metal more evenly and tightly, thereby improving the yield of the device.

[0034] Thirdly, when the electrorheological fluid in each rubber bag is close to the pressing process of the sheet material, the shear thickening liquid will follow the deformation of the rubber bag and evenly contact the surface of the sheet material. When the rubber bag is pressurized and the ejector cylinder drives the punch to slowly push up and extrude in the upper displacement cavity, the electrorheological fluid is energized to harden. The hardened electrorheological fluid can cooperate with the extrusion force of the punch to fully deform the sheet material, further improving the pressing level of the device and reducing the loss of the sheet material. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The schematic diagram is a method for hydraulically forming a rubber bag of a rotating body part;

[0036] Figure 2 It is a main cross-sectional view of the initial stage of a die structure for hydraulically forming a rubber bag of a rotating body part;

[0037] Figure 3It is a main cross-sectional view of a die structure used for hydraulic forming of a rubber bag of a rotating body part at a forming stage;

[0038] Figure 4 It is a main cross-sectional view of the parts of the mold structure in the second embodiment at the initial stage;

[0039] Figure 5 It is the main cross-sectional view of the mold structure in the part forming stage in Example 2.

[0040] In the figure: 100, drawing frame; 200, forming frame; 300, rubber bag sealing ring; 400, rubber bag; 500, through cavity; 600, movement cavity; 700, die base; 800, upper displacement cavity; 900, lower displacement cavity; 1100, ejection cylinder; 1200, nylon ring; 1300, polyurethane pad; 1400, lifting hole; 1500, formed part. DETAILED DESCRIPTION

[0041] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0042] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] Embodiment 1: A method for hydraulically forming a rubber bag of a rotating body part, comprising the following steps:

[0045] S1. Plate placement: Place the plate on the die base 700 and cover the plate with a layer of polyurethane pad 1300;

[0046] S2, parameter adjustment: adjust the clamping force of the forming frame 200 and the drawing frame 100 to 100T, and then fill the rubber bag 400 with oil and increase the pressure to 2Mpa;

[0047] S3, sheet metal pressing: the ejection cylinder 1100 drives the punch to push upwards. Under the action of the hydraulic pressure inside the rubber bag 400, the upward force of the ejection cylinder 1100 acts on the polyurethane pad 1300 and the sheet metal, driving the sheet metal to deform;

[0048] S4, pressurization: continue to increase the pressure in the rubber bag 400, and at the same time, the ejection cylinder 1100 slowly pushes up, and finally the pressure of the rubber bag 400 is stabilized at about 10Mpa, and the ejection cylinder 1100 moves up to a height of about 300mm, and the pressure is maintained for 30s;

[0049] S5. Taking out the material: After the deep drawing is completed, the rubber bag 400 is first slowly depressurized. When there is no pressure in the rubber bag 400, the rubber bag 400 is separated from the formed part 1500, and then the ejection cylinder 1100 slowly falls down, and then the press is opened to remove the mold and take out the formed part 1500.

[0050] like Figure 1 , Figure 2 As shown, a hydraulic forming mold structure for a rubber bag 400 of a rotating body part includes a forming frame 200, a rubber bag sealing ring 300, a rubber bag 400, and a through cavity 500;

[0051] The forming frame 200 is a cylindrical structure, and the forming frame 200 is coaxially provided with a cylindrical through cavity 500;

[0052] The inner wall of the through cavity 500 is fixedly connected to the rubber bag 400, and the upper end of the rubber bag 400 is provided with an injection port;

[0053] The rubber bag sealing ring 300 is fixedly connected to the injection port of the rubber bag 400 , and the outer periphery of the rubber bag sealing ring 300 is fixedly connected to the inner wall of the through cavity 500 .

[0054] Furthermore, the hydraulic forming die structure of the rotary body part rubber bag 400 also includes a drawing frame 100, a movement cavity 600, a die base 700, an upper displacement cavity 800, a lower displacement cavity 900, and an ejection cylinder 1100;

[0055] The drawn container frame 100 is cylindrical, and a cylindrical groove is coaxially formed on the upper end of the drawn container frame 100;

[0056] A cylindrical die seat 700 is movably connected in the groove of the drawing frame 100;

[0057] The upper end of the mold base 700 is coaxially provided with a cylindrical upper displacement cavity 800;

[0058] The lower end of the mold 700 is coaxially provided with a cylindrical lower displacement cavity 900;

[0059] The ejector cylinder 1100 is composed of a cylindrical ejector rod and a punch. The ejector cylinder 1100 passes through the mold base 700. The ejector rod of the ejector cylinder 1100 is slidably connected to the lower displacement cavity 900, and the punch of the ejector cylinder 1100 is slidably connected to the upper displacement cavity 800.

[0060] A cylindrical movement cavity 600 is coaxially formed at the lower end of the drawing frame 100 , and the movement cavity 600 is slidably connected to the ejector rod portion of the ejection cylinder 1100 .

[0061] Furthermore, the radius of the through cavity 500 is the same as the radius of the groove coaxially opened at the upper end of the drawing frame 100 .

[0062] Furthermore, the size of the upper displacement cavity 800 is the same as the size of the lower displacement cavity 900 .

[0063] Furthermore, a nylon ring 1200 is movably connected to the upper end surface of the mold base 700. The nylon ring 1200 is in a circular ring shape as a whole, and the hypotenuse and bevel of the nylon ring 1200 are triangular. A platform of about 2-5 mm is machined at the end point of the hypotenuse of the nylon ring 1200 to fit tightly with the mold base to prevent squeezing and dislocation when the rubber bag 400 is pressurized.

[0064] Furthermore, a cylindrical polyurethane pad 1300 is movably mounted on the upper end surface of the mold base 700. When a sheet of material is placed on the upper end surface of the mold base 700, the polyurethane pad 1300 is placed on top of the sheet of material. The polyurethane pad 1300 utilizes its own elasticity to prevent the material from being damaged when squeezed, and prevents the rubber bag 400 from being scratched or broken.

[0065] Furthermore, two lifting holes 1400 are symmetrically provided on the upper end surface of the die base 700, and the lifting holes 1400 are used to lift the die base 700 into the groove provided in the drawing frame 100. When pressing the sheet material, a hole cone is inserted into the lifting hole 1400 to prevent the die base 700 from having grooves and scratching the rubber bag 400.

[0066] Specific implementation: put the sheet material on the die base 700, cover the sheet material with a layer of polyurethane pad 1300, and clamp the nylon ring 1200 on the outer ring, then the forming frame 200 moves downward to contact and pressurize the upper wall of the die base 700, then add oil to the rubber bag 400 to increase the pressure, and the ejector cylinder 1100 drives the punch to push up in the upper displacement cavity 800. At this time, the rubber bag 400 wraps the sheet material on the punch through pressure, and then the rubber bag 400 continues to increase the pressure to a predetermined pressure. While pressurizing, the ejector cylinder 1100 drives the punch to push up to the final drawing position for pressure maintenance. Finally, the rubber bag 400 is depressurized first, and the ejector cylinder 1100 returns after there is no pressure, and the punch falls naturally, and the forming frame 200 moves up to take out the parts.

[0067] Beneficial effect: The rubber bag 400 is used as a concave die, and the pressure generated by the hydraulic oil is used as a force transmission medium. Through the hydraulic action, the metal sheet is gradually covered on the rigid convex die, so that the shaping of the material is fully exerted, the damage rate inside the material is greatly reduced, and the sheet is prevented from wrinkling, cracking, and excessive thinning.

[0068] Embodiment 2: When the pressed sheet material has a complex shape and poor deformation ability, the punch at the front end of the ejector cylinder 1100 and the rubber bag 400 may not fit tightly, resulting in the formed part 1500 not meeting the requirements. Therefore, Embodiment 2 further improves Embodiment 1.

[0069] like Figure 3 , Figure 4 As shown, the through cavity 500 is equidistantly fixed with a number of rubber bags 400;

[0070] A pressure injection port is provided on the top of each rubber bag 400 , and each rubber bag 400 is externally connected to a pressure sensor.

[0071] By fixing multiple rubber bags 400 at equal intervals in the through cavity 500 and opening an injection port and a pressure sensor above each rubber bag 400, multiple rubber bags 400 can be individually injected according to the shape of the formed part 1500, so that the rubber bags 400 and the punch can press the sheet material more evenly and tightly, thereby improving the yield rate of the device.

[0072] Embodiment 3: In order to further improve the yield rate of sheet metal pressed by the mold structure, embodiment 3 further improves embodiment 2.

[0073] The liquid injected into each rubber bag 400 is an electrorheological fluid;

[0074] The electrorheological fluid in each rubber bag 400 can be pressurized before being electrically hardened, and can have a shaping effect on the sheet material after being electrically hardened;

[0075] The electrorheological fluid is connected to an external power source through a wire. When the rubber bag 400 and the electrorheological fluid are completely attached to the surface of the sheet material, the electrorheological fluid is energized to harden it. The hardened electrorheological fluid can cooperate with the extrusion force of the punch to fully deform the sheet material.

[0076] When the electrorheological fluid in each rubber bag 400 approaches the sheet material, the shear thickening liquid will follow the deformation of the rubber bag 400 and evenly contact the surface of the sheet material. When the rubber bag 400 is pressurized and the ejection cylinder 1100 drives the punch to slowly push up and squeeze in the upper displacement cavity 800, when the rubber bag 400 is completely fitted with the sheet material, the electrorheological fluid is energized to make it harden quickly. The hardened electrorheological fluid and the rubber bag 400 together form a hard forming tool, which can exert greater extrusion force on the sheet material, make the sheet material fully deformed, further improve the pressing level of the device, and also reduce the loss of the sheet material.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for hydraulically forming a rubber bag of a rotating body part, characterized in that: The following steps are involved: S1. Plate placement: Place the plate on the die base (700) and cover the plate with a layer of polyurethane pad (1300); S2, parameter adjustment: the clamping force of the forming frame (200) and the drawing frame (100) is adjusted to 100T, and then the rubber bag (400) is filled with oil and pressurized to 2Mpa; S3, sheet metal pressing: the ejection cylinder (1100) drives the punch to push upward, and under the action of the hydraulic pressure inside the rubber bag (400), the upward force of the ejection cylinder (1100) acts on the polyurethane pad (1300) and the sheet metal, driving the sheet metal to deform; S4, pressurization: continue to increase the pressure in the rubber bag (400), and at the same time, the ejection cylinder (1100) slowly pushes up, and finally the pressure of the rubber bag (400) is stabilized at 10Mpa, and the ejection cylinder (1100) moves up to a height of 300mm, and the pressure is maintained for 30s; S5, taking out the material: after the deep drawing is completed, the rubber bag (400) is first slowly depressurized. When there is no pressure in the rubber bag (400), the rubber bag (400) is separated from the formed part (1500), and then the ejection cylinder (1100) slowly falls down, and then the press is opened to remove the mold and take out the formed part (1500); It comprises a forming frame (200), a rubber bag sealing ring (300), a rubber bag (400), and a through cavity (500); The forming frame (200) is a cylindrical structure, and the forming frame (200) is coaxially provided with a cylindrical through cavity (500); The inner wall of the through cavity (500) is fixedly connected to a rubber bag (400), and an injection port is provided at the upper end of the rubber bag (400); A rubber bag sealing ring (300) is fixedly connected to the injection port of the rubber bag (400), and the outer periphery of the rubber bag sealing ring (300) is fixedly connected to the inner wall of the through cavity (500); The through cavity (500) is equidistantly fixed with a plurality of rubber bags (400); A pressure injection port is provided on the top of each rubber bag (400), and each rubber bag (400) is externally connected to a pressure sensor; The liquid injected into each rubber bag (400) is an electrorheological fluid, and each rubber bag (400) is connected to an external power source. When the rubber bag (400) and the electrorheological fluid are completely attached to the surface of the sheet material, the electrorheological fluid is energized to harden the electrorheological fluid. The hardened electrorheological fluid cooperates with the extrusion force of the punch to fully deform the sheet material. It also includes a drawing frame (100), a movement cavity (600), a die base (700), an upper displacement cavity (800), a lower displacement cavity (900), and an ejection cylinder (1100); The drawing container frame (100) is cylindrical in shape, and a cylindrical groove is coaxially provided at the upper end of the drawing container frame (100); A cylindrical die seat (700) is movably connected in the groove of the drawing frame (100); A cylindrical upper displacement cavity (800) is coaxially formed at the upper end of the mold base (700); A cylindrical lower displacement cavity (900) is coaxially formed at the lower end of the mold base (700); The ejection cylinder (1100) is composed of a cylindrical ejector rod and a punch. The ejection cylinder (1100) passes through the mold base (700). The ejector rod of the ejection cylinder (1100) is slidably connected to the lower displacement cavity (900). The punch of the ejection cylinder (1100) is slidably connected to the upper displacement cavity (800). A cylindrical movement cavity (600) is coaxially formed at the lower end of the drawing container frame (100), and the movement cavity (600) is slidably connected to the ejector rod portion of the ejection cylinder (1100); The upper end surface of the mold base (700) is movably connected to a nylon ring (1200). The nylon ring (1200) is in the shape of a circular ring as a whole. The hypotenuse and bevel of the nylon ring (1200) are in the shape of a triangle. A platform of about 2-5 mm is machined at the end point of the hypotenuse of the nylon ring (1200) to be tightly matched with the mold base (700) to prevent the rubber bag (400) from being squeezed and displaced when pressurized.

2. A mold structure for hydraulically forming a rubber bag of a rotating body part, using a method for hydraulically forming a rubber bag of a rotating body part as claimed in claim 1, characterized in that: The radius of the through cavity (500) is the same as the radius of the groove coaxially opened at the upper end of the drawing frame (100).

3. A mold structure for hydraulically forming a rubber bag of a rotating body part as claimed in claim 2, characterized in that: The size of the upper displacement cavity (800) is the same as the size of the lower displacement cavity (900).

4. A mold structure for hydraulically forming a rubber bag of a rotating body part as claimed in claim 3, characterized in that: A cylindrical polyurethane pad (1300) is movably mounted on the upper end surface of the mold base (700). When a sheet of material is placed on the upper end surface of the mold base (700), the polyurethane pad (1300) is placed on top of the sheet of material. The polyurethane pad (1300) utilizes its own elasticity to prevent the material from being damaged when being squeezed, and at the same time prevents the rubber bag (400) from being scratched or broken.

5. A die structure for hydraulically forming a rubber bag of a rotating body part as claimed in claim 4, characterized in that: The upper end surface of the die base (700) is symmetrically provided with two lifting holes (1400), and the lifting holes (1400) are used to lift the die base (700) into a groove provided in the drawing frame (100). When pressing the sheet material, a hole cone is inserted into the lifting hole (1400) to prevent the upper end surface of the die base (700) from being grooved and scratching the rubber bag (400).

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