A liquid-filled drawing die for molybdenum-based sheet

Abstract

The utility model discloses a kind of molybdenum class plate liquid-filled stretch forming die, it is related to metal pressure processing field, liquid-filled stretch forming die includes die plate, male die plate, edge ring, punching device;Male die plate is movably arranged in the upper position of die plate center, edge ring is sleeved in the outer periphery of male die plate, and abuts in the outer periphery of die plate, die plate is equipped with injection liquid cavity;Punching device is equipped with punch needle, punch needle is movably arranged in edge ring, for breaking through plate piece to realize the positioning of plate piece;Edge ring, male die plate are sequentially pressed down and moved to die plate direction respectively, three mutually close tightly, form the cavity for forming molybdenum metal accessory shape, or three mutually far apart for demolding to facilitate plate piece to be taken out.The liquid-filled forming die of the application replaces existing stamping forming die, and the metal accessory prepared meets the overall structure reliability of accessory, strength requirement prerequisite, obtains high-precision shape size, and its flatness is less than 0.5 silk.

Description

Technical Field

[0001] This utility model relates to the field of metal pressure processing, and in particular to a liquid-filled stretch forming mold for molybdenum plates. Background Technology

[0002] Molybdenum-based metal parts refer to product components with specific shapes, which are made from molybdenum sheets through stamping and pressing. Due to the high melting point of molybdenum (2620℃) and its ability to maintain high strength at high temperatures, as well as its excellent red hardness (the ability to retain hardness at high temperatures), molybdenum is suitable for manufacturing parts for high-temperature environments, such as aerospace engine components and high-temperature molds. Therefore, it is widely used in high-tech industries such as aerospace and automotive where high performance, integrity, and reliability of parts are required under various high-temperature conditions.

[0003] Currently, stamping equipment is commonly used to process molybdenum-based metal parts, as exemplified by patent documents CN118417408A (a processing equipment and method for tungsten-molybdenum alloy plates), CN221231380U (an anti-offset molybdenum plate stamping die), and CN220311484U (a molybdenum plate stamping die). All of these molybdenum-based metal parts are formed using a rigid die consisting of a punch and a die. Specifically, power is applied by a mechanical press or hydraulic press, causing the punch to move downwards and press the sheet metal into the die cavity, achieving the desired shape through plastic deformation.

[0004] However, the aforementioned stamping process results in high local contact stress and significant friction in the sheet metal, making it prone to tearing and wrinkling, which can easily lead to severe deformation or cracking, resulting in a low yield. Furthermore, existing stamping technologies largely fail to address the issue of preventing springback after stamping. The high elastic modulus of molybdenum-based materials leads to very large springback after unloading, making it extremely difficult to control, especially in complex curved surface forming processes. This results in large dimensional accuracy errors in parts, high defect rates, and high processing costs. Therefore, improvements to these technologies are necessary. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, one of the objectives of this utility model is to provide a liquid-filled stretch forming mold for molybdenum plates.

[0006] One of the objectives of this utility model is achieved by the following technical solution: a liquid-filled stretching forming mold for molybdenum plates, comprising a concave template, a convex template, a pressure ring, and a punching device;

[0007] The convex template is movably positioned above the center of the concave template. The pressure ring is sleeved on the outer periphery of the convex template and abuts against the outer periphery of the concave template. The concave template is provided with a liquid injection cavity. The punching device is provided with a punch, which is movably inserted into the pressure ring to penetrate the plate to achieve the positioning of the plate.

[0008] The pressure ring and the convex template move downwards toward the concave template in sequence. The three move closer to each other and close tightly to form a cavity for forming the shape of molybdenum-based metal parts, or they move further apart to demold and remove the plate.

[0009] Furthermore, the punching device also includes a piston rod and an elastic reset member; the pressure ring is provided with a piston cavity for mounting the piston rod, a punch cavity for mounting the punch, and an oil inlet channel for supplying high-pressure liquid to the piston cavity; the elastic reset member is sleeved on the punch and abuts against the punch cavity; high-pressure liquid is introduced into the oil inlet channel, which sequentially drives the piston rod and punch to move downward, penetrating the plate to achieve the positioning of the plate.

[0010] Furthermore, the elastic reset element is a spring.

[0011] Furthermore, the concave template is provided with a punch clearance channel, which is located below the punch cavity and communicates with the punch cavity.

[0012] Furthermore, the concave template is installed on the lower mold base, and the lower mold base is provided with a waste discharge channel. The waste discharge channel is provided with an automatic unloading ramp. The waste discharge channel is connected to the punch avoidance channel. The slab fragments pierced by the punch are discharged out of the liquid filling and stretching forming mold through the automatic unloading ramp. The lower mold base is also provided with a liquid inlet channel, and the liquid inlet channel is connected to the liquid injection cavity.

[0013] Furthermore, the pressure ring includes a pressure beam, an upper clamping plate disposed at the bottom of the pressure beam, and an upper release plate disposed at the bottom of the upper clamping plate. The pressure beam, the upper clamping plate, and the upper release plate are respectively sleeved on the outer periphery of the convex template. The piston chamber is disposed on the upper clamping plate. A sealing ring is provided at the contact position between the upper clamping plate and the pressure beam. The punch and the elastic reset member are disposed inside the upper release plate.

[0014] Furthermore, the upper release plate is provided with an elastic release element.

[0015] Furthermore, two punching devices are provided, located on opposite sides of the pressure ring that are symmetrical about each other.

[0016] Furthermore, the convex template is powered to move downward by a driving device.

[0017] Furthermore, the liquid-filled stretching mold for molybdenum-based sheets also includes a movable guide component.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This application, based on the high hardness and high elasticity of the workpiece being processed, designs a liquid-filled forming mold to replace the existing stamping forming mold. Specifically, a pressure ring first presses and fixes the periphery of the blank, then high-pressure liquid is filled into the concave mold. When the convex mold drives the blank into the concave mold, reverse hydraulic pressure is established, allowing the sheet metal to deform according to a preset shape. By adjusting parameters such as the pressure in the vertical direction, the convex and concave molds cooperate to form a curved surface with a high degree of conformity to the product's shape and dimensions, avoiding severe deformation or cracking. During the curved surface forming process, based on the material characteristics of the component, a sheet metal punching and positioning structure is added to the mold. This punching and positioning structure design reduces the coefficient of variation after component forming from 0.5mm to 0.1mm. While meeting the overall structural reliability and strength requirements of the component, high-precision shape and dimensions are obtained, with a flatness of less than 0.5 microns.

[0020] 2. This application designs a built-in hydraulic punching device. The hydraulic punching device is supplied with high-pressure liquid, which drives the piston rod and punch to move in sequence, piercing the blank. During the liquid filling and forming process, the influence of hydraulic pressure traction in the vertical direction is reduced, thereby effectively limiting the positional displacement of the blank and thus effectively ensuring the shape and dimensional accuracy of the parts. In addition, the positioning holes formed in this process become the limiting holes in the subsequent heating and shaping processes. When the pre-formed parts are held under high temperature and pressure, they can be well shaped, thereby further ensuring the flatness of the parts.

[0021] 3. This application makes reasonable use of the structure in which the punch clearance channel of the concave template is connected to the waste discharge channel. During the liquid filling and forming process, punching and chip removal can be carried out simultaneously, avoiding the impact of chips on the quality of the finished product and saving processing time.

[0022] 4. This application has an elastic element on the elastic demolding part. After the liquid filling molding process is completed, the rebound force of the elastic element will disengage the pressure ring and the convex mold from the concave mold, which facilitates demolding and removal of the workpiece.

[0023] 5. In addition, the design of the moving guide is beneficial to the precision control of the vertical displacement of the concave and convex templates. Attached Figure Description

[0024] Figure 1 A schematic diagram of the finished product manufactured from molybdenum-based metal parts;

[0025] Figure 2 Another perspective view of the finished product of molybdenum-based metal parts;

[0026] Figure 3 This is a schematic diagram of the structure of a preferred embodiment of the molybdenum sheet liquid-filled stretching molding die of this utility model;

[0027] Figure 4 This is a top view of a preferred embodiment of the molybdenum sheet liquid-filled stretching molding die of this utility model;

[0028] Figure 5 for Figure 4 Schematic diagram of the cross section at point BB;

[0029] Figure 6 for Figure 4 Schematic diagram of the cross section at point C;

[0030] Figure 7 This is a disassembly diagram of a preferred embodiment of the liquid-filled stretching molding die for molybdenum-based plates.

[0031] Figure 8 This is a schematic diagram of the punching device according to a preferred embodiment of the present invention;

[0032] In the picture:

[0033] 100. Molybdenum sheet liquid filling and stretching forming mold;

[0034] 1. Concave template; 11. Injection chamber; 12. Punch clearance channel;

[0035] 2. Convex template;

[0036] 3. Edge clamping ring; 31. Edge clamping beam; 32. Upper clamping plate; 33. Upper release plate;

[0037] 4. Punching device; 41. Punch; 42. Piston rod; 43. Elastic return element; 44. Piston chamber; 45. Punch chamber; 46. Oil inlet channel;

[0038] 5. Lower mold base; 51. Waste material discharge channel; 52. Liquid inlet channel;

[0039] 6. Sealing ring;

[0040] 7. Flexible release mechanism;

[0041] 8. Moving guide components;

[0042] A. Molybdenum-based metal fittings / plates; A1. Circular edge; A2. Concave surface; A3. Positioning hole. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0044] This solution uses the processing of molybdenum-based metal parts with specific shapes as an example to illustrate the application method of the liquid-filled stretching forming mold for molybdenum-based plates. Specifically, the molybdenum-based metal part A includes a plate with a concave surface A2. The plate has an annular edge A1 around its periphery, and the annular edge A1 has a positioning hole A3. Figure 1-2 As shown.

[0045] The molybdenum-based metal part A processed in this scheme is manufactured using a liquid-filled stretching forming mold 100 for molybdenum-based sheet metal. Specifically, as shown... Figure 3-8 As shown, the liquid-filled stretch forming mold 100 for molybdenum plates includes a concave mold 1, a convex mold 2, a pressure ring 3, and a punching device 4.

[0046] The convex template 2 is movably positioned above the center of the concave template 1. The pressure ring 3 is sleeved on the outer periphery of the convex template 2 and abuts against the outer periphery of the concave template 1. The concave template 1 is provided with an injection cavity 11. The punching device 4 is provided with a punch 41, which is movably inserted into the pressure ring 3 and used to penetrate the plate to achieve the positioning of the plate.

[0047] The pressure ring 3 and the convex template 2 move downward toward the concave template 1 in sequence. The three move closer to each other and close tightly to form a cavity for forming the shape of molybdenum metal part A, or they move further apart to demold so that the metal part A can be removed.

[0048] This application, based on the high hardness and high elasticity of the workpiece being processed, designs a liquid-filled forming mold to replace the existing stamping forming mold. Specifically, the pressure ring 3 first presses and fixes the periphery of the blank, then fills the concave mold 1 with high-pressure liquid. When the convex mold 2 drives the blank into the concave mold 1, reverse hydraulic pressure is established, allowing the sheet to deform according to a preset shape. By adjusting parameters such as the pressure in the upper and lower directions, the convex mold 2 and the concave mold 1 cooperate to form a curved surface with a high degree of adaptability to the shape and size of the product, avoiding serious deformation or cracks. During the curved surface forming process, according to the material characteristics of the component, a sheet punching positioning structure is added to the mold. The punching positioning structure design reduces the coefficient of variation after the component is formed from the original 0.5mm to 0.1mm. Under the premise of meeting the overall structural reliability and strength requirements of the component, high-precision shape and size are obtained, with a flatness of less than 0.5 mm.

[0049] As a further preferred embodiment, the punching device 4 also includes a piston rod 42 and an elastic reset member 43; the pressure ring 3 is provided with a piston chamber 44 for mounting the piston rod 42, a punch chamber 45 for mounting the punch 41, and an oil inlet channel 46 for supplying high-pressure liquid to the piston chamber 44; the elastic reset member 43 is sleeved on the punch and abuts against the punch chamber 45; the oil inlet channel 46 is supplied with high-pressure liquid, which sequentially drives the piston rod 42 and the punch 41 to move downward, piercing the plate to achieve the positioning of the plate.

[0050] This application designs a built-in hydraulic punching device 4. The hydraulic punching device 4 is supplied with high-pressure liquid, which sequentially drives the piston rod 42 and the punch 41 to move and penetrate the blank. During the liquid filling and forming process, the influence of hydraulic pressure traction in the vertical direction is reduced, thereby effectively limiting the positional displacement of the blank and thus effectively ensuring the shape and dimensional accuracy of the parts. In addition, the positioning hole A3 formed in this process becomes the limiting hole in the subsequent heating, shaping and setting process. When the pre-formed parts are held under high temperature and pressure, they can be well set, thereby further ensuring the flatness of the parts.

[0051] As a further preferred embodiment, the elastic reset element 43 is a spring.

[0052] As a further preferred embodiment, the concave template 1 is provided with a punch avoidance channel 12, which is located below the punch cavity 45 and communicates with the punch cavity 45.

[0053] As a further preferred embodiment, the concave template 1 is mounted on the lower mold base 5, and the lower mold base 5 is provided with a waste discharge channel 51. The waste discharge channel 51 is provided with an automatic unloading ramp. The waste discharge channel 51 is connected to the punch avoidance channel 12. The slab fragments pierced by the punch 41 are discharged out of the liquid filling and stretching forming mold through the automatic unloading ramp. The lower mold base 5 is also provided with a liquid inlet channel 52, which is connected to the liquid injection cavity 11.

[0054] This application makes reasonable use of the structure in which the punch avoidance channel 12 of the concave template 1 is connected to the waste discharge channel 51. During the liquid filling and forming process, punching and chip removal can be carried out simultaneously, avoiding the impact of chips on the quality of the finished product and saving processing time.

[0055] As a further preferred embodiment, the pressure ring 3 includes a pressure beam 31, an upper clamping plate 32 disposed at the bottom of the pressure beam 31, and an upper release plate 33 disposed at the bottom of the upper clamping plate 32. The pressure beam 31, the upper clamping plate 32, and the upper release plate 33 are respectively sleeved on the outer periphery of the convex template 2. The piston cavity 44 is disposed on the upper clamping plate 32. A sealing ring 6 is provided at the contact position between the upper clamping plate 32 and the pressure beam 31. The punch 41 and the elastic reset member 43 are disposed inside the upper release plate 33.

[0056] As a further preferred embodiment, the upper ejector plate 33 is provided with an elastic ejector component 7. The elastic ejector component 7 is provided with an elastic element. After the liquid filling and molding process is completed, the rebound force of the elastic element will disengage the pressure ring 3 and the convex template 2 from the concave template 1, facilitating demolding and removal of the workpiece.

[0057] As a further preferred embodiment, two punching devices 4 are provided, located on opposite sides of the pressure ring 3 symmetrically. The number and distribution of the punching devices 4 ensure that the positioning holes A3 are located on opposite sides of the workpiece symmetrically, which is more conducive to dispersing the hydraulic pressure traction and thus effectively limiting the positional displacement of the slab.

[0058] As a further preferred embodiment, the convex template 2 is powered to move downward by a drive device (not shown). The drive device may be the tension cylinder of an existing hydrostatic tensioning device.

[0059] As a further preferred option, the molybdenum sheet liquid-filled stretch forming die also includes a movable guide 8. The design of the movable guide 8 facilitates precise control of the vertical displacement of the concave die 1 and the convex die 2.

[0060] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A liquid-filled stretching molding die for molybdenum-based sheets, characterized in that, Includes concave template, convex template, pressure ring, and punching device; The convex template is movably positioned above the center of the concave template. The pressure ring is sleeved on the outer periphery of the convex template and abuts against the outer periphery of the concave template. The concave template is provided with a liquid injection cavity. The punching device is provided with a punch, which is movably inserted into the pressure ring to penetrate the plate to achieve the positioning of the plate. The pressure ring and the convex template move downwards toward the concave template in sequence. The three move closer to each other and close tightly to form a cavity for forming the shape of molybdenum-based metal parts, or they move further apart to demold and remove the plate.

2. The liquid-filled stretching forming die for molybdenum-based sheets as described in claim 1, characterized in that, The punching device further includes a piston rod and an elastic reset member; the pressure ring is provided with a piston chamber for mounting the piston rod, a punch chamber for mounting the punch, and an oil inlet channel for supplying high-pressure liquid to the piston chamber; the elastic reset member is sleeved on the punch and abuts against the punch chamber; high-pressure liquid is introduced into the oil inlet channel, which sequentially drives the piston rod and punch to move downward, penetrating the plate to achieve the positioning of the plate.

3. The liquid-filled stretching forming die for molybdenum-based plates as described in claim 2, characterized in that, The elastic reset element is a spring.

4. The liquid-filled stretching forming die for molybdenum-based plates as described in claim 2, characterized in that, The concave template is provided with a punch clearance channel, which is located below the punch cavity and communicates with the punch cavity.

5. The liquid-filled stretching forming die for molybdenum-based plates as described in claim 4, characterized in that, The concave template is installed on the lower mold base, which is provided with a waste discharge channel and an automatic unloading ramp. The waste discharge channel is connected to the punch avoidance channel. The slab fragments pierced by the punch are discharged outside the liquid filling and stretching forming mold through the automatic unloading ramp. The lower mold base is also provided with a liquid inlet channel, which is connected to the liquid injection cavity.

6. The liquid-filled stretching forming die for molybdenum-based plates as described in claim 2, characterized in that, The pressure ring includes a pressure beam, an upper clamping plate disposed at the bottom of the pressure beam, and an upper release plate disposed at the bottom of the upper clamping plate. The pressure beam, the upper clamping plate, and the upper release plate are respectively sleeved on the outer periphery of the convex template. The piston chamber is disposed on the upper clamping plate. A sealing ring is provided at the contact position between the upper clamping plate and the pressure beam. The punch and the elastic reset member are disposed inside the upper release plate.

7. The liquid-filled stretching forming die for molybdenum-based plates as described in claim 6, characterized in that, The upper release plate is equipped with an elastic release element.

8. The liquid-filled stretch forming die for molybdenum-based sheets as described in any one of claims 1-7, characterized in that, Two punching devices are provided, located on opposite sides of the pressure ring symmetrically.

9. The liquid-filled stretch forming die for molybdenum-based sheets as described in any one of claims 1-7, characterized in that, The convex template is powered to move downward by a driving device.

10. The liquid-filled stretch forming die for molybdenum-based sheets as described in any one of claims 1-7, characterized in that, The liquid-filled stretch forming mold for molybdenum plates also includes a moving guide.

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