Bolt bar type multi-point forming drawing and pushing type clip-shaped clamp

Abstract

The invention belongs to the technical field of machine manufacturing, and relates to a bolt bar type multi-point forming clamp which comprises the specific steps that S1, two supports are fixed to a punching machine through bolts on a bottom plate; s2, the bolt rod is installed on a mold, and the bolt rod is embedded into the support after being subjected to corresponding shape adjustment; s3, a supporting block is placed between the bottom plate and the mold to fix the mold and bear pressure; s4, the plate is placed between the upper die and the lower die, and a target curved surface can be obtained through stamping machining; and S5, the mold is replaced, the supporting block is detached, the mold is pulled out and reshaped, and the supporting block is embedded and installed again for remachining. The bolt bar type multi-point forming clamp is simple in structure, economical and practical. Through the device, the die can be quickly and efficiently replaced and adjusted, so that the overall production efficiency and flexibility are improved, and the device has the characteristics of simplicity and convenience in operation, low cost, high efficiency, strong integrating degree and the like, and is expected to promote better application and popularization of a bolt bar type multi-point forming technology.

Description

Technical field:

[0001] The present invention belongs to the field of mechanical manufacturing technology and relates to a clamp for bolt rod type multi-point forming. The clamp has the advantages of simple operation, low cost, high efficiency, strong fit, etc., and is expected to promote better application and promotion of multi-point forming technology. Background technology:

[0002] Small batch parts, that is, workpieces with low demand, play an indispensable role in aerospace, shipbuilding, medical and other fields. Multi-point forming technology has begun to be used in the field of mechanical processing due to its advantages such as high production efficiency, flexibility without mold opening, and low processing cost. This technology uses regularly arranged basic pressure rods to replace traditional integral molds, showing highly flexible and adjustable characteristics. Depending on the type of pressure rod, multi-point forming can be divided into two forms: hydraulic rod and bolt rod. The bolt rod form has become a new trend in the development of multi-point forming technology due to its simple structure, low cost, and high quality of formed parts. However, the mold and stamping machine of the bolt rod type multi-point forming need to be connected by a fixture in order to realize the processing of the bolt rod type multi-point forming.

[0003] Chinese patent CN115178636A provides a hydraulic rod type hyperbolic sheet multi-point forming stretching device, in which the clamping mechanism includes two groups of flexible clamps, which are respectively located on both sides of the multi-point forming mechanism. Each group of clamping mechanisms consists of a clamping seat, a clamping cylinder and an adjustment frame. The clamping seat is provided with a clamping port, and the clamping cylinder drives the relative movement of the upper clamping block and the lower clamping block through the piston rod to adjust the clamping force. The clamps are connected through an adjustment cylinder, and the adjustment cylinder drives the change of the angle between adjacent clamps so that the clamps can adapt to the bending shape of the sheet. A pivot hole is provided on the side of the clamping seat, and adjacent clamping seats are connected through a pivot shaft to ensure that the clamp can accurately adapt to the changes in the sheet. The device includes multiple clamps, adjustment cylinders, clamping cylinders, pivot shafts and other components, and the overall structure is relatively complex. The precise cooperation requirements of each component are high, which increases the structural complexity of the device. This not only makes the manufacturing, installation and commissioning process more cumbersome, but may also lead to higher maintenance costs. Chinese patent CN217941519U discloses a flexible clamp of a new type of hydraulic rod-type hyperbolic sheet multi-point forming and stretching device, including multiple sets of clamps pivoted in sequence and an adjustment cylinder arranged between each two adjacent sets of clamps. The clamping openings of the multiple sets of clamps face the same direction, and the adjustment cylinder drives the two adjacent sets of clamps to rotate relative to each other, so that the angle between the adjacent clamping openings changes adaptively with the bending of the sheet. The present invention can improve the quality of sheet stretching and reduce sheet consumables. However, the device has a complex structure, and when it is necessary to change to process different curved surfaces, the operation process is cumbersome, which reduces the processing efficiency.

[0004] From the above, it can be seen that the invention of multi-point forming fixtures is relatively small at present and is only applicable to hydraulic rod type multi-point forming, but not to bolt rod type multi-point forming, which will seriously affect the technical application and promotion of bolt rod type multi-point forming. Summary of the invention:

[0005] In view of the above problems, the present invention proposes a bolt rod type multi-point forming fixture with a simple structure and economical and practical application, that is, a push-pull type return clamp used between the punch head and the workbench of a traditional punching machine. The specific application is that first, two supports are fixed on the traditional punching machine through the bottom plate respectively, the adjusted bolt rod type multi-point mold is embedded in the support, and a support block is placed between the bottom plate and the mold to bear the pressure. Then, the plate is placed between the upper and lower molds, and then the stamping process is carried out. Finally, the stamping is completed, the formed plate is taken out, and the processing is completed.

[0006] The device of the invention can quickly and efficiently replace and adjust the mold, thereby improving the overall production efficiency and flexibility. In addition, the device has the advantages of simple structure and low manufacturing cost. The device of the invention is expected to be widely promoted and applied in the aviation, automobile and other industries. Description of the drawings:

[0007] Figure 1 Schematic diagram of the overall structure of bolt rod multi-point forming

[0008] Figure 2 Schematic diagram of the return fixture structure

[0009] 1. Workbench 2. Punch 3. Upper return fixture 4. Lower return fixture 5. Support 6. Multi-point mold

[0010] 7. Support block 8. Bolt rod 9. Bottom plate Specific implementation method:

[0011] (1) Specific composition:

[0012] The present invention is a bolt rod type multi-point forming push-pull type return clamp, which is characterized by two identical 3. upper return clamps and 4. lower return clamps, wherein each return clamp includes 5. a support, 6. a multi-point mold, 7. a support block, and 9. a bottom plate.

[0013] The support 5 is in a U-shaped structure to ensure sufficient strength during the stamping process. One side is open for rapid advancement and withdrawal of the mold to improve processing efficiency. A groove is provided near the top to perfectly nest the mold 6 and fix the mold 6. However, in order to facilitate the replacement of the mold 6, a gap is left between the mold 6 and the groove, and the height of the groove from the bottom is greater than the length of the bolt rod 8. A number of threaded holes are provided at the bottom to connect the support 5 and the bottom plate 9.

[0014] The mold 6 is provided with prefabricated threaded holes, each of which is equipped with a bolt rod 8 of the same length. The height of the bolt rod 8 can be adjusted by a shape adjustment device according to the curvature of the formed curved surface to form different curved surfaces. A portion of the periphery is left without threaded holes for engaging the support 5.

[0015] The bottom plate 9 has a plurality of threaded holes for fixing the support 5 to the punch press, and some of the threaded holes can be counterbored as required for easy installation.

[0016] (2) Specific operation steps

[0017] 1) First, the support 5 is connected to the base plate 9 by bolts, and then the threaded holes on the base plate are used to respectively connect the workbench 1 and the punch 2 on the punch press, so that both sets of supports and the base plate are fixed to the punch press. The matching threaded rod 8 is installed into the threaded hole of the mold 6 through the shape adjustment device.

[0018] 2) When performing stamping work, first adjust the bolt rods 8 of the upper and lower molds 6 to different heights through the shape adjustment device to form the target curved surface. The two molds 6 after the shape adjustment are respectively embedded in the upper and lower supports 5, and ensure that the upper and lower molds correspond to each other. In order to withstand the pressure generated during the stamping process, a support block 7 is placed between the mold 6 and the open side of the base plate 9, and try to ensure that the support block 7 is placed in the middle so that it is symmetrical and evenly stressed. This design not only ensures the firm fixation of the mold, but also effectively disperses the pressure to prevent the mold 6 from shifting or deforming during the forming process. Then place the sheet between the upper and lower molds 6. To ensure the processing accuracy, place the sheet horizontally on the lower mold 6, and ensure that the sheet is in the center of the mold 6. The pressure applied by the punch 2 causes the upper and lower molds 6 to squeeze the sheet and deform it and finally form it.

[0019] 3) After completing one type of curved surface processing, if other curved surfaces need to be processed, the conversion operation can be easily performed. First, after the punch 2 of the punch press moves to separate the upper and lower molds, the support block 7 is removed from between the mold 6 and the base plate 9. Then, the two molds 6 are directly pulled out from the support 5. Next, the two molds 6 are fixed to the support of the shape adjustment device, and the corresponding curved surface shape adjustment is performed, and the height of each bolt rod 8 is readjusted to form a new target curved surface. Finally, the mold 6 that has been adjusted is re-embedded in the support 5, and the support block 7 is installed. The plate is placed between the upper and lower molds 6 to process the new curved surface again.

Claims

1. A fixture for bolt rod multi-point forming, characterized in that: The specific steps include: S1. Install the support: Fix the two supports to the punch press respectively with bolts through the bottom plate; S2. Adjust the mold: Install the bolt rod on the mold, adjust the shape accordingly and then embed it into the support; S3, fixed mold: Place a support block between the base plate and the mold to fix the mold and bear the pressure; S4. Obtain the target surface: Place the sheet between the upper and lower dies to perform stamping to obtain the target curved surface; S5. Replace the mold: Remove the support blocks, pull out the mold and reshape it, insert and install the support blocks again.

2. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The holder has the necessary recesses for insertion.

3. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The support is a U-shaped structure.

4. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The support block has an interference fit to facilitate fixation and pressure bearing.

5. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The size of the base plate should be larger than the support to facilitate fixation to the punching machine.

6. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The installation and removal of the mold are both done by pulling and pushing.

7. The fixture for bolt rod type multi-point forming according to claim 1, characterized in that: The support and the base plate are connected by threads to facilitate processing and disassembly.

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