Method and device for integrally forming diaphragm box of pressure accumulator

Abstract

The present invention provides an accumulator diaphragm box integral forming method and device, including: inserting a movable die into a tube blank part, adjusting the distance between the movable die and the fixed die; introducing a high-pressure fluid medium through the internal flow channel of the connecting rod, and the pressure and loading time of the high-pressure medium are adjusted by a pressure control device; keeping the movable core head, the fixed head, the pre-expansion limit mold and the movable die in position, and adjusting the pressure control device to unload the pressure of the high-pressure medium; the pre-expansion limit mold is separated and rotated radially and separated from the tube blank part; the movable die moves axially to form a single waveform; the movable die is progressively displaced axially, and the movable core head is also displaced axially; and the second and subsequent waveforms are formed. The present invention avoids welding deformation, weld scratches, weld surface oxidation color, weld black spots and internal oxidation inclusion defects caused by traditional welding methods, reduces the difficulty of quality control in the production process, and significantly improves the production efficiency and production quality of the diaphragm box.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing flexible telescopic pipe fittings for a power system in the field of aerospace, and in particular to an integral forming method and device for a diaphragm box of an accumulator. Background Art

[0002] As the core component of the accumulator, the diaphragm box plays a key role in the power system in the aerospace field, especially in liquid rocket engines. It is mainly used to buffer the impact pressure, adjust the fluid pressure, and is installed at the propellant inlet of the liquid rocket engine to suppress the POGO effect and ensure the stability and success of the rocket launch process. Traditionally, the diaphragm box is usually made by welding, that is, the inflection point of the corrugated peak or trough is divided into diaphragms, and then the inner and outer sides are welded in turn to form a diaphragm box made of multiple groups of diaphragms.

[0003] However, this traditional welding method has many limitations and challenges. First, since the thickness of the diaphragm box material is usually only 0.3mm, and high-strength, high-corrosion-resistant materials such as stainless steel or high-temperature alloys are mostly used, the welding process requires the use of micro-arc Tig welding or laser welding with a small heat input, which increases the risk of welding deformation and is prone to defects such as weld dents, flaky oxidation color on the weld surface, and black spots on the weld. Secondly, defects such as oxidation inclusions are prone to occur inside the weld joint, which further reduces the service capacity of the diaphragm box product. Under the action of complex vibration and internal pressure loads, microcracks are prone to occur in the weld and expand to fail, making the production control of diaphragm box products difficult and the product quality difficult to guarantee.

[0004] With the surge in my country's space launch missions, the requirements for the manufacturing efficiency and product quality of membrane box products are getting higher and higher. Traditional welding processes can no longer meet the current high-quality and high-efficiency requirements of membrane box products in the aerospace field. Therefore, a new membrane box forming method is urgently needed to eliminate the risks brought by traditional welding methods and improve the production efficiency and quality of membrane box products.

[0005] Therefore, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a method and device for integrally forming a diaphragm box of an accumulator.

[0007] According to a method for integrally forming a diaphragm box of an accumulator provided by the present invention, the method comprises the following steps:

[0008] Step S1: pre-installation positioning, inserting the movable die into the tube blank part, assembling the tube blank part onto the mold base, fixing the tube blank part by moving the core head, and adjusting the distance between the movable die and the fixed die;

[0009] Step S2: pressurized bulging, introducing high-pressure fluid medium through the internal flow channel of the connecting rod to bulge the side wall of the tube blank part, and the pressure of the high-pressure medium and the loading time are adjusted by the pressure control device;

[0010] Step S3: Unloading, keeping the movable core head, the fixed end cap, the pre-expansion limit mold and the movable concave mold in position, and adjusting the pressure control device to unload the high-pressure medium pressure;

[0011] Step S4: the bulging die is displaced, and the pre-bulking limiting die is separated and rotated in the radial direction to be separated from the tube blank part;

[0012] Step S5: Pressing and upsetting the material, the movable die moves axially to upset the deformed area axially, and at the same time, the internal pressure generated by the volume compression of the tube blank part causes the material in the bulging area to spread radially to form a single waveform;

[0013] Step S6: the mold is progressively reset, the movable concave mold is progressively displaced in the axial direction, the pressure pad is loaded, the pre-expansion limit mold is progressively displaced in the axial direction and then radially closed, and the movable core head is also moved in the axial direction;

[0014] Step S7: Repeat steps S2 to S6 to complete the forming of the second and subsequent waveforms.

[0015] Preferably, the step S1 further includes the steps of installing the pre-expansion limiting mold and fixing it radially, and moving the fixed head axially to connect with the mold base and deforming the pipe end.

[0016] Preferably, the high-pressure fluid medium in step S2 is a fluid in liquid, gaseous or semi-solid form.

[0017] Preferably, in step S2, the bulging height is set by a pre-bulking limiting die.

[0018] Preferably, in step S6, after the pressure is released by the pressure adjusting device, the moving die is progressively displaced axially by P, and the axial displacement relative to the initial position is λ, the pressing pad is installed, and then the pre-expansion limiting mold is progressively displaced axially by λ, and radially closed after returning to its position, and the moving core head is also moved axially by λ.

[0019] The present invention also provides a pressure accumulator diaphragm integral forming device, the device is used to perform the pressure accumulator diaphragm integral forming method mentioned above, comprising:

[0020] Die base: connected to the fixed die and forms a high-pressure sealing structure with the fixed head to fix the tube blank parts;

[0021] Mobile die: Its displacement can be precisely adjusted along the axial direction to complete local extrusion deformation;

[0022] Mobile core head: its displacement can be precisely adjusted along the axial direction, and a static sealing structure is adopted at the interface with the tube blank part;

[0023] Driving device: used to adjust the position of the moving core head, the fixed head, the moving die and the fixed die;

[0024] Pressure control device: used to control the loading, unloading and loading time of high-pressure medium pressure.

[0025] Preferably, it also includes a pre-expansion limiting mold and a pressing pad. The pre-expansion limiting mold is a radially divisible structure and can be adjusted along the axial displacement; the pressing pad is a radially divisible structure.

[0026] Preferably, the fixed die is connected to the die base, and the fixed head and the die base form a high-pressure sealing structure.

[0027] Preferably, the displacement of the movable die and the movable core head can be precisely adjusted along the axial direction.

[0028] Preferably, a fixed die is also included, whose profile can be adjusted according to needs.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention avoids the defects of welding deformation, welding mushroom scratches, weld surface oxidation color, weld black spots and internal oxidation inclusions in the joint caused by the traditional welding method, reduces the difficulty of quality control in the production process, and thus significantly improves the production efficiency and production quality of the membrane box;

[0031] 2. The present invention adopts the integral forming technology, the material distribution of the diaphragm box is more uniform, the structure is more complete, and it has higher strength and better toughness. The diaphragm box can better resist the generation and expansion of microcracks under the action of complex vibration and internal pressure loads, thereby extending the service life and service capacity of the diaphragm box;

[0032] 3. The present invention can achieve precise control of the profile accuracy of corrugated forming by adjusting parameters such as fluid pressure, mold profile and mold action sequence, so that the waveform size of the membrane box is more accurate and the shape is more stable, thereby meeting the requirements of the aerospace field for high precision and high reliability of the membrane box;

[0033] 4. The integral forming method adopted in the present invention simplifies the production process, reduces the steps and manual intervention in the production process, reduces the production cost, improves the production efficiency, and makes the manufacture of the membrane box more efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0035] Figure 1 This is a schematic diagram of the overall forming of the accumulator diaphragm box;

[0036] Figure 2 The figure shows the structure schematic diagram of the integral forming device of the accumulator diaphragm box;

[0037] Figure 3 Shown is a flow chart of the integral forming method of the accumulator diaphragm box;

[0038] Figure 4 It is a structural schematic diagram of step S1 of the present invention;

[0039] Figure 5 It is a structural schematic diagram of step S4 of the present invention;

[0040] Figure 6 It is a structural schematic diagram of step S5 of the present invention;

[0041] Figure 7 It is a structural schematic diagram of step S7 of the present invention.

[0042] in:

[0043] DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] Embodiment 1:

[0046] Reference Figure 3 According to a method for integrally forming a diaphragm box of an accumulator provided by the present invention, the method comprises the following steps:

[0047] Step S1: Pre-installation and positioning, inserting the movable die into the tube blank part, assembling the tube blank part onto the die base, fixing the tube blank part by moving the core head, and adjusting the distance between the movable die and the fixed die; it also includes the steps of installing the pre-expansion limit die and fixing it radially, and moving the fixed head axially to connect with the die base and deforming the tube end.

[0048] Step S2: Pressurized bulging, high-pressure fluid medium is introduced through the internal flow channel of the connecting rod to bulge the side wall of the tube blank part. The pressure and loading time of the high-pressure medium are adjusted by the pressure control device; the high-pressure fluid medium is a liquid, gaseous or semi-solid fluid. The bulging height is set by the pre-bulging limit die.

[0049] Step S3: Unloading, keeping the movable core head, the fixed end cap, the pre-expansion limit mold and the movable concave mold in position, and adjusting the pressure control device to unload the high-pressure medium pressure;

[0050] Step S4: the bulging die is displaced, and the pre-bulking limiting die is separated and rotated in the radial direction to be separated from the tube blank part;

[0051] Step S5: Pressing and upsetting the material, the movable die moves axially to upset the deformed area axially, and at the same time, the internal pressure generated by the volume compression of the tube blank part causes the material in the bulging area to spread radially to form a single waveform;

[0052] Step S6: The mold is progressively reset, the moving die is progressively displaced axially, the pressure pad is installed, the pre-expansion limit mold is progressively displaced axially and then radially closed, and the moving core head is also displaced axially; after the pressure is released by the pressure adjusting device, the moving die is progressively displaced axially by P, and the axial displacement relative to the initial position is λ, the pressure pad is installed, and then the pre-expansion limit mold is progressively displaced axially by λ, and radially closed after returning to its position, and the moving core head is also displaced axially by λ.

[0053] Step S7: Repeat steps S2 to S6 to complete the forming of the second and subsequent waveforms.

[0054] Reference Figure 1 and Figure 2 The present invention also provides a pressure accumulator diaphragm integral forming device, the device is used to perform the pressure accumulator diaphragm integral forming method described above, comprising:

[0055] Die base: connected to the fixed die and forms a high-pressure sealing structure with the fixed head to fix the tube blank parts;

[0056] Mobile die: Its displacement can be precisely adjusted along the axial direction to complete local extrusion deformation;

[0057] Mobile core head: its displacement can be precisely adjusted along the axial direction, and a static sealing structure is adopted at the interface with the tube blank part;

[0058] Driving device: used to adjust the positions of the moving core head, the fixed head, the moving die and the fixed die;

[0059] Pressure control device: used to control the loading, unloading and loading time of high-pressure medium pressure. The pressure loading and unloading of high-pressure medium and the displacement of the moving core head and the moving die form a servo control loop. First, when the moving die and the moving core head move to the specified position, the medium is pressurized to pre-expand the tube blank parts. When the pressure reaches the predetermined value, it is unloaded to no pressure after holding the pressure for 1s-2s, and the fluid medium circuit is set to an open state. After the unloading is completed, the moving die moves axially and completes the local extrusion deformation. The moving die moves axially in the reverse direction to the set position, and the moving core head moves to the set position synchronously. After the pressure pad and the pre-expansion limit mold are installed, the fluid medium circuit is set to a closed state, thereby completing a loading and unloading control cycle. The necessary and sufficient conditions for pressure loading are that the moving core head, the moving die, the pre-expansion limit mold, and the pressure pad are moved into place, and the necessary and sufficient conditions for pressure unloading are that the maximum pressure reaches the predetermined value and the holding time is completed.

[0060] The accumulator diaphragm box integral forming device also includes a pre-expansion limit mold, a pressure pad and a fixed die. The pre-expansion limit mold is a radially divisible structure and can be adjusted along the axial displacement; the pressure pad is a radially divisible structure. The profile of the fixed die can be adjusted according to demand. The fixed die is connected to the die base, and the fixed head and the die base form a high-pressure sealing structure. The displacement of the movable die and the movable core head can be precisely adjusted along the axial direction.

[0061] Embodiment 2:

[0062] The purpose of the present invention is to provide an accumulator diaphragm box integral forming device, which realizes the integral forming of a large-diameter diaphragm box product with high shape and size accuracy, uniform diaphragm box performance, and strong service reliability through the combined deformation of free bulging and internal pressure supported bending bulging, thereby solving the problems of low production efficiency and unstable production quality of diaphragm boxes in the prior art.

[0063] The present invention provides an accumulator diaphragm integral forming method, which adopts the stretching deformation of the tube blank part to obtain the precision tube blank part corrugation, and realizes the manufacture of multi-corrugated diaphragm box products. The specific method is to fill the tube blank part with high-pressure fluid, design a variable and adjustable mold on the outside of the tube blank part, and the tube blank part realizes the corrugation forming under the joint action of the high-pressure fluid and the mold, and the control of the corrugation forming surface accuracy is realized by adjusting the fluid pressure, the mold surface and the mold action sequence. The integral forming of the diaphragm box has the characteristics of high shape and size accuracy, uniform diaphragm box performance, and strong service reliability.

[0064] The implementation process of this method is as follows: (1) Calculate the area of ​​local tensile deformation and determine the distance between the dies; (2) Calculate the deformation force and determine the fluid pressure; (3) Deform under single wave high pressure; (4) Maintain the mold movement under high pressure so that the deformation obtains a single wave upsetting; (5) Unload the internal pressure and reset the mold to increase the waveform distance; (6) Press the wave intermediate mold; (7) Apply pressure to the deformed area and the local area; (8) Repeat the process (3) to (5) to complete the forming of the second waveform; Repeat the above steps to complete the forming of the entire membrane box.

[0065] The length and diameter of the tube blank are determined according to the tensile and compressive deformation of the waveform, and are appropriately adjusted according to the material of the diaphragm box.

[0066] This method is suitable for materials with good room temperature plasticity, such as stainless steel and high-temperature alloys. For materials with poor plasticity, high and low temperature conditions can be adopted.

[0067] A method and device for integrally forming a diaphragm box of an accumulator, which realizes the forming of a diaphragm box product with a large diameter ratio through a combination of free bulging and bending bulging supported by internal pressure. The main device includes a fixed die, a movable core head, a pressing pad and a driving device.

[0068] The free bulging is a deformation under the action of a high-pressure fluid medium, during which the material flows freely and is replenished;

[0069] The bending and bulging is the extension and deformation of the material under the support of internal pressure. The internal pressure support during the deformation process prevents wrinkling defects from occurring.

[0070] The combination of free bulging and internal pressure supported bending bulging is to first achieve material gathering through free bulging, and then achieve material stretching through bending bulging;

[0071] The high pressure fluid medium can be a fluid in the form of liquid, gas, or semi-solid.

[0072] The fixed concave die can adopt different profiles according to the requirements to ensure the control of the bulging curved surface.

[0073] Free bulging means that under the action of the surface normal force, the local area of ​​the tube billet part drives the axial filling of one end of the tube billet part, and at the same time, the radial expansion occurs in the local area. The radial displacement and local deformation are determined by the surface area of ​​the waveform.

[0074] Free bulging is achieved by sealing one end of the tube blank part, using the internal moving core head and the outer mold to form a sealing area together, so that the tube blank part in the outer suspended area can be radially deformed under the action of internal pressure.

[0075] The high-pressure medium used for free bulging can be any fluid medium.

[0076] Upsetting deformation refers to the local deformation area of ​​free bulging supported by internal pressure, and the local extrusion deformation is completed by the axial movement of the movable die, so that the material spreads radially, thereby achieving the purpose of increasing the wave crest and reducing the wavelength.

[0077] Internal pressure support refers to the use of high-pressure medium to provide normal force inside the model. In this process, the internal support force is regulated by the volume change of the aforementioned sealed space to achieve pressure increase, and a pressure control valve is designed to adjust the support force.

[0078] The combined deformation of free bulging and internal pressure supported bending bulging means that the forming order of a single wave is first free bulging to complete the axial aggregation of the single wave material, and then the mold compression realizes the radial spreading of the material, and completes the forming of a single wave in sequence.

[0079] The above process is only for achieving precise control of the waveform. Of course, for products with low precision requirements, axial aggregation and radial spreading can also be carried out simultaneously.

[0080] The mold comprises a mold base, a fixed head, a fixed die, a pressing pad, a pre-expansion limit mold, a movable die, a movable core head and a driving device, and a pressure control device.

[0081] The displacement of the movable core head and the movable die can be precisely adjusted along the axial direction. The interface between the movable core head and the tube blank part adopts a static sealing structure and can be adjusted along the axial direction. The pre-expansion limit die is a radially separable block structure and can be adjusted along the axial direction. The pressure pad is a radially separable block structure, the fixed die is connected to the die base, and the fixed head and the die base are high-pressure sealing structures.

[0082] Another object of the present invention is to propose a method for integrally forming a accumulator diaphragm box. The above-mentioned accumulator diaphragm box integrally forming device is used to fill a high-pressure fluid in a tube blank part. The tube blank part realizes corrugation forming under the joint action of the high-pressure fluid and the mold, and the fluid pressure, mold surface and mold action sequence are adjusted to realize the control of the surface accuracy of the corrugated forming, thereby solving the problems of low production efficiency and unstable production quality of diaphragm boxes in the prior art.

[0083] A method for integrally forming a diaphragm box of a pressure accumulator comprises the following steps:

[0084] S1. Pre-installation positioning:

[0085] First, insert the movable die into the tube blank part from one end, assemble the tube blank part to the die base, place the movable core head on the tube blank part and fix it with a connecting rod, adjust the distance S between the movable die and the fixed die, install the pre-expansion limit die and fix it radially, move the fixed head axially to connect with the die base and deform the tube end.

[0086] S2, pressurized bulging:

[0087] The movable core head screw is tightened and mechanically positioned, and high-pressure water medium is introduced through the internal flow channel of the connecting rod to cause the side wall of the tube blank part to bulge. The pressure of the high-pressure medium and the loading time are adjusted by the pressure control device. The other end of the tube blank part is automatically fed along the axial direction under the traction of the bulging force, and the bulging height is set by the pre-bulging limit die.

[0088] S3. Uninstall:

[0089] The movable core head, the fixed end cap, the pre-expansion limit die and the movable concave die are kept in fixed positions, and the pressure regulating device adjusts the pressure of the high-pressure medium to be unloaded to zero.

[0090] S4, bulging die shift:

[0091] The pre-expansion limiting die separates radially, and then rotates along point O to separate from the tube blank part and offset to one side.

[0092] S5, Pressing and upsetting:

[0093] The movable die moves axially, causing the deformed area to be upset axially. At the same time, the internal pressure generated by the volume compression of the tube blank part causes the material in the bulging area to spread radially under the traction of the internal pressure and axial pressure, thereby forming a single waveform.

[0094] S6, mold progressive reset:

[0095] After the pressure is released by the pressure adjusting device, the movable die is progressively displaced P in the axial direction, and the axial displacement relative to the initial position is λ. The pressing pad is installed, and then the pre-expansion limit die is progressively displaced λ in the axial direction. After returning to the position, it is radially closed, and the movable core head is also moved λ in the axial direction.

[0096] S7, Formation of the 2nd + nth waveform

[0097] Repeat S2-S6 to complete the forming of the 2nd and 2+nth waveforms.

[0098] An accumulator diaphragm integral forming device, the accumulator diaphragm is an axially telescopic flexible pipe, the pipe wall generatrix is ​​a typical continuous corrugated curve, including:

[0099] The mold base, wherein the flat side of the mold base is connected to the fixed concave mold, and the mold base is connected to the fixed head to form a high-pressure sealing structure, which can fix the tube blank parts;

[0100] A fixed sealing head, wherein the fixed sealing head and the mold base form a high-pressure sealing structure;

[0101] A fixed concave die, wherein the fixed concave die is connected to the die base;

[0102] A material pressing pad, wherein the material pressing pad is a radially divisible structure;

[0103] The pre-expansion limiting mold is a radially divisible structure and can be adjusted along the axial displacement;

[0104] The movable concave die can be precisely adjusted in the axial direction to complete the local extrusion deformation and spread the material in the radial direction, thereby achieving the purpose of increasing the wave crest and reducing the wavelength;

[0105] A movable core head, the displacement of which can be precisely adjusted along the axial direction, a static sealing structure is adopted at the interface between the movable core head and the tube blank part, and the displacement can be adjusted along the axial direction;

[0106] A driving device, wherein the driving device can adjust the positions of the movable core head, the fixed end cap, the movable die, the fixed die, and the pre-expansion limit die;

[0107] A pressure control device, wherein the pressure control device can control the loading, unloading and loading time of the high-pressure medium pressure.

[0108] The fixed die can adopt different profiles according to the requirements to ensure the control of the bulging surface; the high-pressure fluid medium can be a fluid in the form of liquid, gas and semi-solid.

[0109] Free bulging uses deformation under the action of high-pressure fluid medium, and the material flows freely during the deformation process; bending bulging is the extension deformation of the material under the support of internal pressure, and the internal pressure support during the deformation process prevents wrinkling defects; the combination of free bulging and internal pressure supported bending bulging is to first achieve material aggregation through free bulging, and then achieve material stretching through bending bulging; free bulging refers to the local area of ​​the tube blank part, under the action of the surface normal force, driving the axial filling of one end of the tube blank part, and at the same time expanding radially in the local area, and the radial displacement and local deformation are determined by the surface area of ​​the waveform; free bulging is achieved by sealing one end of the tube blank part, using the internal moving core head and the outer mold to form a sealing area together, so as to achieve under the action of internal pressure. The tube blank parts in the outer suspended area undergo radial deformation; upsetting deformation refers to the local deformation area being supported by internal pressure through free bulging, and the local extrusion deformation is completed by the axial movement of the movable die, so that the material spreads radially, thereby achieving the purpose of increasing the wave crest and reducing the wavelength; internal pressure support refers to the use of high-pressure medium to provide normal force inside the model. In this process, the internal support force is regulated by the volume change of the aforementioned sealed space to achieve the pressure increase, and a pressure control valve is designed to achieve the adjustment of the support force; the combined deformation of free bulging and internal pressure supported bending bulging refers to the forming order of a single wave, which is first free bulging to complete the axial aggregation of the single wave material, and then the die compression to achieve the radial spreading of the material, and the forming of a single wave is completed in sequence.

[0110] The current diaphragm box is made by welding, which has defects such as large welding deformation, weld scratches, flaky oxidation color on the surface of the weld, black spots on the weld and oxidation inclusions inside the joint, resulting in poor service capacity of the diaphragm box products, difficult production control and low product quality. By using the method of integrally forming the diaphragm box with tube blank parts, a composite forming method of single-wave bulging and upsetting is adopted to realize the forming of the diaphragm box waveforms one by one, thereby eliminating the risks brought by traditional welding methods and improving the production efficiency and quality of diaphragm box products.

[0111] like Figure 1 and Figure 2 As shown, the present invention provides a pressure accumulator diaphragm box integral forming device, comprising:

[0112] Tube blank part 1, integral forming device 2, movable core head 3, movable die 4, pre-expansion limit die 5, pressing pad 6, fixed die 7, die base 8, fixed head 9. Specifically, the service capability of membrane box products is poor, production control is difficult, and product quality is unstable. The present invention proposes a method of integrally forming a membrane box using tube blank parts, and adopts a composite forming method of single wave bulging and upsetting to realize the forming of membrane box waveforms one by one, thereby eliminating the risks brought by traditional welding methods, improving the production efficiency and production quality of membrane box products, and having important engineering application value.

[0113] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator according to the present invention, one end of the movable die 4 is inserted into the tube blank part 1, the tube blank part 1 is assembled onto the die base 8, the movable core head 3 is placed on the tube blank part 1 and fixed by a connecting rod, the distance S between the movable die 4 and the fixed die 7 is adjusted, the pre-expansion limit die 5 is installed and radially fixed, and the fixed head 9 is moved axially to connect with the die base 8 and deform the tube end.

[0114] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator according to the present invention, the movable core head 3 is screw-tightened and mechanically positioned, and a high-pressure water medium is introduced through the internal flow channel of the connecting rod to cause the side wall of the tube blank part 1 to bulge. The pressure of the high-pressure medium and the loading time are adjusted by a pressure control device. The other end of the tube blank part is automatically fed along the axial direction under the traction of the bulging force, and the bulging height is set by the pre-bulking limit die 5.

[0115] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator according to the present invention, the movable core head 3, the fixed head 9, the pre-expansion limiting mold 5 and the movable die 4 are stationary, and the pressure regulating device adjusts the pressure of the high-pressure medium to unload to zero.

[0116] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator of the present invention, the pre-expansion limiting mold 5 is separated in the radial direction, and then rotated along point O to separate from the tube blank part 1 and offset to one side.

[0117] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator according to the present invention, the movable die 4 moves axially to upset the deformed area axially, and at the same time, the internal pressure generated by the volume compression of the tube blank part 1 causes the material in the bulged area to spread radially under the traction of the internal pressure and the axial pressure, thereby forming a single waveform.

[0118] In a preferred embodiment of the method and device for integrally forming a diaphragm box of an accumulator according to the present invention, after the pressure regulating device is depressurized, the movable die 4 is progressively displaced P in the axial direction, and the axial displacement relative to the initial position is λ, the pressing pad 6 is installed, and then the pre-expansion limiting die 5 is progressively displaced λ in the axial direction, and radially closed after returning to the position, and the movable core head 3 is also moved λ in the axial direction.

[0119] In a preferred embodiment of the method and apparatus for integrally forming a diaphragm box of an accumulator according to the present invention, the steps are repeated to complete the forming of the second and 2+n waveforms.

[0120] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0121] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0122] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for integrally forming a diaphragm box of an accumulator, characterized in that: The method comprises the following steps: Step S1: pre-installation positioning, inserting the movable die into the tube blank part, assembling the tube blank part onto the mold base, fixing the tube blank part by moving the core head, and adjusting the distance between the movable die and the fixed die; Step S2: pressurized bulging, introducing high-pressure fluid medium through the internal flow channel of the connecting rod to bulge the side wall of the tube blank part, and the pressure of the high-pressure medium and the loading time are adjusted by the pressure control device; Step S3: Unloading, keeping the movable core head, the fixed end cap, the pre-expansion limit mold and the movable concave mold in position, and adjusting the pressure control device to unload the high-pressure medium pressure; Step S4: the bulging die is displaced, and the pre-bulking limiting die is separated and rotated in the radial direction to be separated from the tube blank part; Step S5: Pressing and upsetting the material, the movable die moves axially to upset the deformed area axially, and at the same time, the internal pressure generated by the volume compression of the tube blank part causes the material in the bulging area to spread radially to form a single waveform; Step S6: the mold is progressively reset, the movable concave mold is progressively displaced in the axial direction, the pressure pad is loaded, the pre-expansion limit mold is progressively displaced in the axial direction and then radially closed, and the movable core head is also moved in the axial direction; Step S7: Repeat steps S2 to S6 to complete the forming of the second and subsequent waveforms.

2. The method for integrally forming a diaphragm of a pressure accumulator according to claim 1, characterized in that: The step S1 also includes the steps of installing the pre-expansion limiting mold and fixing it radially, and moving the fixed head axially to connect with the mold base and deforming the pipe end.

3. The method for integrally forming a diaphragm of a pressure accumulator according to claim 1, characterized in that: The high-pressure fluid medium in step S2 is a fluid in liquid, gaseous or semi-solid form.

4. The method for integrally forming a diaphragm of an accumulator according to claim 1, characterized in that: In step S2, the bulging height is set by the pre-bulking limiting die.

5. The method for integrally forming a diaphragm of an accumulator according to claim 1, characterized in that: In step S6, after the pressure is released by the pressure adjusting device, the moving die is progressively displaced P in the axial direction, and the axial displacement relative to the initial position is λ, the pressing pad is installed, and then the pre-expansion limit mold is progressively displaced λ in the axial direction, and radially closed after returning to the position, and the moving core head is also moved λ in the axial direction.

6. An accumulator diaphragm integral forming device, characterized in that: The device is used to perform the accumulator diaphragm integral forming method according to any one of claims 1 to 5, comprising: Die base: connected to the fixed die and forms a high-pressure sealing structure with the fixed head to fix the tube blank parts; Mobile die: Its displacement can be precisely adjusted along the axial direction to complete local extrusion deformation; Mobile core head: its displacement can be precisely adjusted along the axial direction, and a static sealing structure is adopted at the interface with the tube blank part; Driving device: used to adjust the positions of the moving core head, the fixed head, the moving die and the fixed die; Pressure control device: used to control the loading, unloading and loading time of high-pressure medium pressure.

7. The pressure accumulator diaphragm integral forming device according to claim 6, characterized in that: It also includes a pre-expansion limiting mold and a pressure pad. The pre-expansion limiting mold is a radially divisible structure and can be adjusted along the axial displacement; the pressure pad is a radially divisible structure.

8. The pressure accumulator diaphragm integral forming device according to claim 6, characterized in that: The fixed concave die is connected to the die base, and the fixed sealing head and the die base form a high-pressure sealing structure.

9. The pressure accumulator diaphragm integral forming device according to claim 6, characterized in that: The displacement of the movable die and the movable core head can be precisely adjusted along the axial direction.

10. The pressure accumulator diaphragm integral forming device according to claim 6, characterized in that: It also includes a fixed die, whose profile can be adjusted according to requirements.

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