Pressure forming auxiliary device and forming method for closed cross-section member

Abstract

The application provides a pressure forming auxiliary device and forming method for a closed cross-section component, which comprises a fixed mold, a first movable mold, an inverted V-shaped block, a linear guide rail and a second movable mold; the first movable mold and the second movable mold are respectively slidably installed on one side of the inverted V-shaped surface of the inverted V-shaped block through the linear guide rail; the first movable mold and the second movable mold are provided with the fixed mold on the side opposite to the inverted V-shaped block and are allowed to move back and forth to the side of the fixed mold. The application endows the pressure forming technology with the ability of processing closed cross-section components.

Description

Technical Field

[0001] This invention relates to the field of pressure forming auxiliary device structure, and more specifically, to a pressure forming auxiliary device and forming method for closed cross-section components. Background Technology

[0002] Closed-section structural members, due to their superior compressive, bending, and torsional resistance compared to open-section members, as well as excellent thermal insulation, moisture resistance, and corrosion resistance, are frequently used as basic components in various types of structural systems. Structural systems assembled from closed-section members offer advantages such as light weight, high strength, and rapid implementation, while also meeting aesthetic requirements, thus finding widespread application in construction, automotive, and aerospace industries. Typical closed-section shapes include circular, square, box-shaped, and irregular shapes, with circular cross-section members, i.e., circular tubes, being the most common.

[0003] Pressure forming technology refers to a forming method that uses pressure to deform a workpiece to obtain a target part. It includes various specific forms such as forging, hydroforming, and stamping. For thin-walled or thin-plate parts, stamping or extrusion is typically used. A press is the equipment used to achieve pressure forming; hydraulic presses and stamping presses are the most common types. Taking hydroforming and hydraulic presses as examples, hydroforming uses liquid substances such as water or oil as the force transmission medium, driving a piston to apply pressure to the blank, causing plastic deformation. The hydraulic press is the equipment that completes this process. Typically, the working cylinder of the press is located at the top, with the piston moving axially downwards, while the lower die is fixed. The upper and lower dies used for forming are fixed to the piston and lower die, respectively. The piston drives the upper die to rise and fall, opening and closing the upper and lower dies. Because the moving die in this forming mode only has one degree of freedom, even increasing the number of forming passes makes it difficult to form closed-section components. Developing auxiliary devices and forming methods suitable for pressure forming of closed-section components to fully utilize the advantages of low cost and high efficiency in pressure forming technology has practical application value.

[0004] Patent documents CN115156374A and CN114769446A respectively propose two pressure forming methods for seamless steel pipes. The former also proposes an auxiliary device, while the latter designs a completely new stamping forming equipment. Although both can process round pipes using pressure forming technology, the relatively complex structural design increases the difficulty of implementation and has limited versatility, only applicable to the forming of circular cross-section components. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a pressure forming auxiliary device and forming method for closed-section components.

[0006] A pressure forming auxiliary device for a closed-section component according to the present invention includes: a fixed mold, a first moving mold, an inverted V-shaped block, a linear guide rail, and a second moving mold;

[0007] The first moving mold and the second moving mold are respectively slidably mounted on one side of the inverted V-shaped surface of the inverted V-shaped block via the linear guide rail;

[0008] The first moving mold and the second moving mold are positioned opposite to the inverted V-shaped block and are allowed to move back and forth toward the fixed mold.

[0009] Preferably, the inverted V-shaped block is mounted on the top plate on the side facing away from the first moving mold and the second moving mold, and the fixed mold is mounted on the bottom plate on the side facing away from the first moving mold and the second moving mold.

[0010] Preferably, a plurality of guide posts are installed on the base plate, and a guide sleeve is installed on the top plate. The guide sleeve is fitted onto the guide posts and allows sliding along the axial direction of the guide posts.

[0011] Preferably, a compression spring is fitted onto the guide post, with one end of the compression spring connected to the base plate and the other end connected to the top plate or the guide sleeve.

[0012] Preferably, the top plate is connected to the actuator end of the press, the bottom plate is connected to the fixed end of the press, and the top plate moves back and forth towards the bottom plate under the drive of the actuator end of the press.

[0013] Preferably, when the first moving mold and the second moving mold move to contact the fixed mold, a cavity is provided at the intersection of the first moving mold, the second moving mold and the fixed mold.

[0014] Preferably, the first moving mold and the second moving mold are provided with a first inclined surface facing the inverted V-shaped block, and the slope α of the first inclined surface of the first moving mold and the second moving mold is the same as the slope of one side of the corresponding connected inverted V-shaped surface;

[0015] The fixed mold is provided with a figure-eight shaped surface on the side facing the first moving mold and the second moving mold, and the first moving mold and the second moving mold are provided with a second inclined surface on the side facing the figure-eight shaped surface. The slope β of the second inclined surface of the first moving mold and the second moving mold is the same as the slope of one side of the corresponding connected figure-eight shaped surface.

[0016] α and β satisfy: tanα>tanβ or α>β.

[0017] Preferably, the linear guide rail includes: a slider and a slide rail;

[0018] The slide rail is installed on one side of the inverted V-shaped surface of the inverted V-shaped block, and the slider is slidably connected to the slide rail. The first inclined surface of the first moving mold or the second moving mold is connected to the slider.

[0019] Preferably, a screw is mounted on the inverted V-shaped surface of the inverted V-shaped block, and the screw head limits the slider along the stroke direction.

[0020] Preferably, a forming method for a pressure forming auxiliary device for the closed-section member includes the following steps:

[0021] Step S1: Determine the basic dimensions of the pressure forming auxiliary device based on the installation conditions, load conditions, and working environment; perform initial assembly of each part and check whether the parts can move relative to each other as preset.

[0022] Step S2: Place the pressure forming auxiliary device on the press, with the base plate connected to the fixed end of the press and the top plate connected to the execution end of the press.

[0023] Step S3: Place the blank to be formed into the cavity of the fixed mold, start the press, and press the top plate down. The first moving mold and the second moving mold contact the blank to be formed and the fixed mold in turn through the linear guide rail, thereby realizing the closing process of the first moving mold, the second moving mold and the fixed mold.

[0024] In step S4, the press continues to press down until the first moving mold and the second moving mold are in contact, and the forming process is completed.

[0025] In step S5, the press execution end is raised, the top plate is lifted by the compression spring, the first moving mold and the second moving mold move together with the top plate and separate from the fixed mold, and the blank to be formed is pressed into the target shape.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention endows pressure forming technology with the ability to process closed-section parts through structures such as a fixed mold, a first moving mold, and a second moving mold;

[0028] 2. This invention can be matched with various pressure forming methods such as hydroforming and stamping;

[0029] 3. This invention is applicable to various cross-sectional shapes such as circles and squares by using different cavity designs;

[0030] 4. The present invention has a simple structure, controllable cost, and no special requirements for operating conditions. Attached Figure Description

[0031] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the main structure of the pressure forming auxiliary device;

[0033] Figure 2 This is a side view of the pressure forming auxiliary device.

[0034] Figure 3 This is an isometric side view assembly drawing (top view) of the pressure forming auxiliary device;

[0035] Figure 4 This is an isometric side view assembly drawing (bottom view) of the pressure forming auxiliary device;

[0036] Figure 5 This is a partial cross-sectional view of the pressure forming auxiliary device;

[0037] Figure 6 A bottom view of the inverted V-shaped block;

[0038] Figure 7 A sectional view of the position of the inverted V-shaped block limiting threaded hole;

[0039] Figure 8 A partially enlarged schematic diagram of the limiting effect of the pressure forming auxiliary device;

[0040] Figure 9 A schematic diagram of the device in its free state when forming a circular cross-section component;

[0041] Figure 10 This is a schematic diagram of the final state of the device when forming a circular cross-section component.

[0042] Figure 11 A schematic diagram of the device in its free state when forming a square cross-section component;

[0043] Figure 12 This is a schematic diagram of the final state of the device when forming a square cross-section component.

[0044] As shown in the figure:

[0045] Detailed Implementation

[0046] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0047] Example 1

[0048] like Figure 1 As shown, this embodiment includes: a fixed mold 2, a first moving mold 3, an inverted V-shaped block 4, a linear guide rail 5, and a second moving mold 9. The first moving mold 3 and the second moving mold 9 are slidably mounted on one side of the inverted V-shaped surface of the inverted V-shaped block 4 via the linear guide rail 5. The fixed mold 2 is positioned on the side of the first moving mold 3 and the second moving mold 9 facing away from the inverted V-shaped block 4, allowing them to move back and forth towards the fixed mold 2. The side of the inverted V-shaped block 4 facing away from the first moving mold 3 and the second moving mold 9 is mounted on the top plate 6, and the fixed mold 2 is mounted on the side of the fixed mold 2 facing away from the first moving mold 3 and the second moving mold 9 is mounted on the bottom plate 1. Multiple guide posts 8 are mounted on the bottom plate 1, and guide sleeves 7 are mounted on the top plate 6. The guide sleeves 7 are fitted onto the guide posts 8 and allow them to slide axially along the guide posts 8. Compression springs 10 are mounted on the guide posts 8, with one end of the compression spring 10 connected to the bottom plate 1 and the other end connected to the top plate 6 or the guide sleeve 7.

[0049] The linear guide 5 includes a slider and a slide rail; the slide rail is installed on one side of the inverted V-shaped surface of the inverted V-shaped block 4, the slider is slidably connected to the slide rail, and the first inclined surface of the first moving mold 3 or the second moving mold 9 is connected to the slider.

[0050] The first moving mold 3 and the second moving mold 9 are provided with a first inclined surface facing the inverted V-shaped block 4. The slope α of the first inclined surface of the first moving mold 3 and the second moving mold 9 is the same as the slope of one side of the corresponding connected inverted V-shaped surface. The fixed mold 2 is provided with a figure-eight shaped surface facing the first moving mold 3 and the second moving mold 9. The first moving mold 3 and the second moving mold 9 are provided with a second inclined surface facing the figure-eight shaped surface. The slope β of the second inclined surface of the first moving mold 3 and the second moving mold 9 is the same as the slope of one side of the corresponding connected figure-eight shaped surface. α and β satisfy: tanα>tanβ or α>β.

[0051] like Figures 6 to 8 As shown, screws are installed on the inverted V-shaped surface of the inverted V-block 4, and the screw heads limit the slider along the stroke direction.

[0052] like Figures 9 to 12 As shown, the top plate 6 is connected to the actuator end of the press, and the bottom plate 1 is connected to the fixed end of the press. The top plate 6 moves back and forth towards the bottom plate 1 under the drive of the actuator end of the press. When the first moving mold 3 and the second moving mold 9 move to contact the fixed mold 2, a cavity is formed at the intersection of the first moving mold 3, the second moving mold 9 and the fixed mold 2.

[0053] This embodiment also provides a forming method for a pressure forming auxiliary device for closed-section components, including the following steps: Step S1, determine the basic dimensions of the pressure forming auxiliary device according to the installation conditions, load conditions, and working environment, perform initial assembly of each part, and check whether the parts can move relative to each other according to the preset parameters; Step S2, place the pressure forming auxiliary device on the press, connect the base plate 1 to the fixed end of the press, and connect the top plate 6 to the execution end of the press; Step S3, place the blank to be formed into the cavity of the fixed mold 2, and start the press. In step S4, the press actuator presses down the top plate 6, and the first moving mold 3 and the second moving mold 9 come into contact with the blank to be formed and the fixed mold 2 in turn through the linear guide rail 5, thereby realizing the closing process of the first moving mold 3, the second moving mold 9 and the fixed mold 2; in step S5, the press actuator continues to press down until the first moving mold 3 and the second moving mold 9 are in contact, and the forming process is completed; in step S5, the press actuator lifts up, the top plate 6 is lifted by the compression spring 10, the first moving mold 3 and the second moving mold 9 move together with the top plate 6 and separate from the fixed mold 2, and the blank to be formed is pressed into the target shape.

[0054] Example 2

[0055] Example 2 is a preferred example of Example 1.

[0056] like Figures 1 to 5 As shown, this embodiment includes: a base plate 1, a fixed mold 2, a first moving mold 3, an inverted V-shaped block 4, a linear guide rail 5, a top plate 6, a guide sleeve 7, a guide post 8, a second moving mold 9, and a compression spring 10. The fixed mold 2 is fixedly installed on the base plate 1. The first moving mold 3 and the second moving mold 9 are fixedly connected to the slider of the linear guide rail 5. Each side of the inverted V-shaped surface of the inverted V-shaped block 4 is equipped with a slide rail of the linear guide rail 5. The inverted V-shaped block 4 is fixedly installed on the top plate 6. The guide post 8 is fixedly connected to the base plate 1, and the guide sleeve 7 is fixedly connected to the top plate 6. The two ends of the compression spring 10 abut against the base plate 1 and the guide sleeve 7 or the top plate 6, respectively. Under the constraint of the guide post 8 and the guide sleeve 7, the base plate 1 and the top plate 6 can only move relative to each other along the axial direction of the guide post 8.

[0057] like Figure 1 As shown, the first moving mold 3 and the second moving mold 9 are mirror-symmetrical. The first moving mold 3 and the second moving mold 9 have two inclined surfaces with different slopes on their upper and lower sides. The slope of the first inclined surface on the upper side is the same as the slope of the inverted V-shaped block 4, and the slope of the second inclined surface on the lower side is the same as the slope of the fixed mold 2. The two inclined surfaces should satisfy the following geometric relationship:

[0058] tanα>tanβ or α>β

[0059] In the formula: α is the inclination angle of the first inclined plane, and β is the inclination angle of the second inclined plane.

[0060] like Figures 5 to 8As shown, the first inclined surface of the first moving mold 3 and the second moving mold 9 is provided with a positioning groove that matches the slider of the linear guide rail 5. The inclined surface of the inverted V-shaped surface is provided with a positioning groove that matches the slide rail of the linear guide rail 5. A certain number of threaded holes are machined on any side of the positioning groove. After a screw is screwed into the threaded hole, the screw head can limit the slider of the linear guide rail 5.

[0061] This embodiment also provides a forming method for a pressure forming auxiliary device, including the following steps: Non-standard parts design steps: Determine the basic dimensions of the pressure forming auxiliary device according to the installation conditions, load conditions, and working environment; design and manufacture each non-standard part; purchase each standard part; perform initial assembly of each part and check whether the parts can move relative to each other according to the preset parameters; place the pressure forming auxiliary device on a press, such as a hydraulic press or a stamping press; connect the base plate 1 to the fixed end of the press, such as the fixed template of a hydraulic press or the worktable of a stamping press; connect the top plate 6 to the execution end of the press, such as the piston of a hydraulic press or the punching press. The press includes a punch and die; the blank to be formed is placed into the cavity of the fixed die 2, the press is started, and the press's actuator presses down the top plate 6. The first moving die 3 and the second moving die 9 successively contact the blank to be formed and the fixed die 2, and move along a non-linear trajectory, thereby realizing the closing process of the first moving die 3, the second moving die 9, and the fixed die 2; the press's actuator continues to press down until the first moving die 3 and the second moving die 9 are in contact, and the forming process is completed; the press's actuator lifts up, the top plate 6 is lifted by the compression spring 10, and the first moving die 3 and the second moving die 9 move together with the top plate 6, separating from the fixed die 2, and the blank to be formed is pressed into the target shape. It should be noted separately that during the forming process, the non-linear motion trajectory followed by the first moving die 3 and the second moving die 9 can be obtained through methods such as energy principles.

[0062] like Figure 9 , Figure 10 As shown, in one embodiment, the effective mold surfaces of the fixed mold 2, the first moving mold 3, and the second moving mold 9 are designed to be circular according to the shape of the target part. After pressure forming, the spatial positions of each component change from a free state to a final forming state, and the blank to be formed is processed into a circular cross-section component, i.e., a circular tube.

[0063] like Figure 11 , Figure 12 As shown, in another embodiment, the effective mold surfaces of the fixed mold 2, the first moving mold 3, and the second moving mold 9 are designed to be square according to the shape of the target part. After pressure forming, the spatial positions of each component change from a free state to a final forming state, and the blank to be formed is processed into a square cross-section component, i.e., a square tube.

[0064] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0065] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An auxiliary device for press forming a closed cross-section member, characterized by, The utility model relates to a kind of pressure forming auxiliary devices, including: Fixed mould (2), first movable mould (3), inverted V-shaped block (4), linear guide rail (5) and second movable mould (9); The first movable mould (3) and the second movable mould (9) are respectively slidably installed on the side surface of the inverted V-shaped surface of the inverted V-shaped block (4) by the linear guide rail (5); The first movable mould (3) and the second movable mould (9) are provided with the fixed mould (2) away from the side of the inverted V-shaped block (4) and allow to move back and forth to the side of the fixed mould (2); The inverted V-shaped block (4) is installed on the top plate (6) away from the side of the first movable mould (3) and the second movable mould (9), and the fixed mould (2) is installed on the bottom plate (1) away from the side of the first movable mould (3) and the second movable mould (9); When the first movable mould (3) and the second movable mould (9) move to contact the fixed mould (2), the first movable mould (3), the second movable mould (9) and the fixed mould (2) are provided with a cavity at the intersection thereof; The first movable mould (3) and the second movable mould (9) are provided with first inclined surfaces away from the side of the inverted V-shaped block (4), and the inclination α of the first inclined surfaces of the first movable mould (3) and the second movable mould (9) is respectively the same as the inclination of the side surface of the corresponding connected inverted V-shaped surface; The fixed mould (2) is provided with a spread shape surface away from the side of the first movable mould (3) and the second movable mould (9), the first movable mould (3) and the second movable mould (9) are provided with second inclined surfaces away from the side of the spread shape surface, and the inclination β of the second inclined surfaces of the first movable mould (3) and the second movable mould (9) is respectively the same as the inclination of the side surface of the corresponding connected spread shape surface; α and β satisfy: tan α > tan β or α > β; The closed cross-section component is a circular cross-section component; A plurality of guide columns (8) are installed on the bottom plate (1), and a guide sleeve (7) is installed on the top plate (6), the guide sleeve (7) is sleeved on the guide column (8) and allows to slide axially along the guide column (8).

2. The press forming assist device for a closed cross-section member according to claim 1, characterized by: A compression spring (10) is sleeved on the guide column (8), one end of the compression spring (10) is connected to the bottom plate (1), and the other end is connected to the top plate (6) or the guide sleeve (7).

3. The press forming assist device for a closed cross-section member according to Claim 1, characterized by: The top plate (6) is connected to the execution end of the press, the bottom plate (1) is connected to the fixed end of the press, and the top plate (6) moves back and forth to the bottom plate (1) under the driving of the execution end of the press.

4. The press-forming assist device for a closed cross-section member according to claim 1, characterized by The linear guide rail (5) includes a slider and a slide rail; The slide rail is installed on the side surface of the inverted V-shaped surface of the inverted V-shaped block (4), the slider is connected to the slide rail in a sliding fit, and the first inclined surface of the first movable mould (3) or the second movable mould (9) is connected to the slider.

5. The press forming assist device for a closed cross-section member according to claim 4, characterized by: Screws are installed on the inverted V-shaped surface of the inverted V-shaped block (4), and the screw heads limit the slider in the stroke direction.

6. A forming method of the press forming auxiliary device for the closed cross section member according to claim 2, characterized by, The utility model relates to a kind of pressure forming auxiliary devices, including the following steps: Step S1, according to installation condition, load condition, operation environment determines the basic size of pressure forming auxiliary device, carries out initial assembly to each part and checks whether each part can move relatively according to preset; Step S2, the pressure forming auxiliary device is placed on the press, the bottom plate (1) is connected with the fixed end of the press, and the top plate (6) is connected with the executing end of the press; Step S3, the blank to be formed is placed into the cavity of the fixed die (2), the press is started, the top plate (6) is pressed down by the executing end of the press, the first movable die (3) and the second movable die (9) are in contact with the blank to be formed and the fixed die (2) in sequence through the linear guide rail (5), so that the closing process of the first movable die (3), the second movable die (9) and the fixed die (2) is realized; Step S4, the executing end of the press continues to press down until the first movable die (3) and the second movable die (9) are attached, and the forming process is completed; Step S5, the executing end of the press is lifted up, the top plate (6) is lifted up by the compression spring (10), the first movable die (3) and the second movable die (9) move together with the top plate (6) and are separated from the fixed die (2), and the blank to be formed is pressed into the target shape.

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