Punch forming device for high-precision flat-bottom end socket

Abstract

The utility model relates to the field of seal head processing equipment, in particular to a punch forming device for a high-precision flat-bottom seal head, which comprises an upper die in a cylindrical shape. The punch forming device further comprises a lower die, and the lower die is provided with a cavity matched with the upper die. A top plate capable of ascending and descending relative to the lower die is arranged at the bottom of the cavity; and a top cylinder for driving the top plate is arranged below the top plate. Through the combined action of the upper die and the top plate, punch forming of the wafer is achieved, an accurate annular wall is formed, and meanwhile it is guaranteed that the wafer cannot be broken and other bad problems. And the upper die and the top plate adopt the innovation of cambered surface design, so that the flatness of the product can be ensured.

Description

Technical Field

[0001] The utility model relates to the field of head processing equipment, and particularly relates to a stamping and forming device for high-precision flat-bottom heads. Background Art

[0002] Problems existing in the production of existing flat-bottom heads include easy fracture during stamping, high defective product rate, and the flatness not meeting the high-precision requirements. For this reason, a manufacturing process for high-precision flat-bottom heads (application number: 2020116136806) was proposed, using a spinning forming method to improve production efficiency and reduce quality risks. However, the spinning method still cannot ensure the flatness of the head, especially for heads with high-precision flatness requirements such as those for medical nuclear magnetic resonance. Summary of the Utility Model

[0003] In view of the above, the purpose of the present utility model is to provide a stamping and forming device for high-precision flat-bottom heads in view of the existing problems.

[0004] A stamping and forming device for high-precision flat-bottom heads provided by the present utility model includes an upper die, and the shape of the upper die is cylindrical; the stamping and forming device further includes a lower die, and the lower die is provided with a cavity matching the upper die; a top plate that can be lifted and lowered relative to the lower die is provided at the bottom of the cavity, and a top cylinder for driving the top plate is provided below the top plate.

[0005] Further, a first arc surface concave inward is provided on the bottom surface of the upper die, and a second arc surface convex upward matching it is provided on the top surface of the top plate.

[0006] Further, a circular arc chamfer is provided at the bottom edge of the upper die.

[0007] Further, circular arc chamfers are provided at both the bottom edge and the top edge of the cavity.

[0008] Further, the top plate is a conical plate with a diameter gradually decreasing from top to bottom, and a conical hole matching the top plate is correspondingly provided at the bottom of the lower die.

[0009] Further, vent holes are provided on the upper die.

[0010] Further, positioning steps are provided on the lower die.

[0011] Further, a heating device can be provided at the edge of the cavity of the lower die.

[0012] Compared with the prior art, the present utility model mainly realizes the stamping and forming of the wafer through the combined action of the upper die and the top plate, forming an accurate annular wall, and at the same time ensuring that no bad problems such as fracture occur to the wafer. Moreover, the innovative arc surface design of the upper die and the top plate can ensure the flatness of the product. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of a stamping device;

[0014] Figure 2 It is a schematic diagram in the stamping state;

[0015] Figure 3 It is Figure 2 The enlarged view of part A in

[0016] Reference numerals in the figure: upper die 101, first arc surface 101a, ventilation hole 101b, lower die 102, positioning step 102a, second arc surface 102b, top plate 103, top cylinder 104, heating device 105, tapered hole 106, gap 107. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Referring to Figures 1 - 3 As shown, a forming device for a high-precision flat bottom head provided by the present invention is used to perform positive punching on a round sheet to form an annular wall on the outer edge of the round sheet. Specifically, the stamping device includes an upper die 101, the shape of the upper die 101 is cylindrical, and there is an arc chamfer at the bottom edge; it also includes a lower die 102, the lower die 102 has a cavity matching the upper die 101, and both the bottom edge and the top edge of the cavity are designed with arc chamfers; a top plate 103 that can be lifted and lowered relative to the lower die 102 is provided at the bottom of the cavity, and a top cylinder 104 for driving the lifting and lowering of the top plate 103 is provided below the top plate 103; after the upper die 101 punches downward, the edge of the round sheet can be deformed to form an annular wall, and the top plate 103 at the bottom of the lower die 102 can be driven by the top cylinder 104 to rise and descend together with the upper die 101 to eliminate the height difference between the round sheet and the bottom of the cavity, avoiding bad problems such as fracture of the head; at the same time, the round sheet is clamped and moved downward by the upper die 101 and the top plate 103, which can prevent the round sheet from shifting during the stamping process, improving the forming accuracy and quality of the head.

[0019] It should be noted that a positioning step 102a is provided on the lower die 102, which is used to position the round sheet to ensure that the round sheet is in the accurate position.

[0020] As another important improvement of the present utility model, the bottom surface of the upper die 101 and the top surface of the top plate 103 are both arc surfaces. The bottom surface of the upper die 101 is a first concave arc surface 101a, and the top surface of the top plate 103 is a second convex arc surface 102b that matches it. Generally, both the upper die 101 and the bottom of the cavity are flat surfaces to ensure the flatness of the product after molding. However, considering that the head of this application is a thin product and has a high requirement for flatness, if the traditional method is used, although the flatness can be ensured during stamping, after it leaves the stamping and forming device, under the influence of gravity, the middle part will sag instead, making the bottom surface of the head become a slightly convex arc surface. Therefore, in the improved device, the bottom of the head during molding is an upward arc surface, and this upward arc surface can offset the influence of gravity after leaving the stamping and forming device, so that the flatness of the bottom of the head reaches the predetermined requirement.

[0021] The diameter of the arc surface at the bottom of the upper die 101 is referred to in the following table:

[0022]

[0023] In addition, the arc chamfer design of the above-mentioned upper die 101 and the cavity can make the deformation of the wafer more stable and avoid bad problems such as fracture of the head. Of course, the arc chamfer at the lower part of the cavity is more due to the shape requirement of the head itself.

[0024] As another embodiment, a heating device 105 can be added to the edge of the cavity of the lower die 102, which will help improve the forming quality of the head and avoid bad problems such as fracture. The heating device 105 can increase the temperature of the edge of the cavity of the lower die 102 and heat the deformation position of the wafer, which helps the wafer to deform, thereby ensuring the forming quality of the head. The heating device 105 can work in ways such as electric heating wire, hot air gun or hot oil circulation, and actually, a suitable heating method can be selected according to the specific production environment and process requirements.

[0025] As another important improvement of the present utility model, the top plate 103 is a conical plate with a gradually decreasing diameter, and a conical hole 106 matching the top plate 103 is correspondingly provided at the bottom of the lower die 102. Refer to Figure 1As shown, during the process from the rise of the top plate 103 until it descends to a predetermined position, there will always be a gap 107 between the side surface of the top plate 103 and the side surface of the conical hole 106. This gap 107 forms a venting channel, which can keep the internal and external atmospheric pressures consistent, enabling the upper die 101 to be smoothly and completely embedded into the cavity during the downward punching, thus ensuring the flatness and quality of the head. At the same time, this gap 107 also plays a role in preventing excessive air pressure, ensuring the continuity and efficiency of production, and ensuring the quality and reliability of the product. For a similar purpose, vent holes 101b are provided on the upper die 101 of the present utility model. The vent holes 101b are formed because the bottom surface of the upper die 101 adopts a concave arc surface design. After it contacts the flat circular sheet, a sealed air chamber is formed in the middle. The existence of the vent holes 101b can ensure that the circular sheet can smoothly deform after being clamped by the upper die 101 and the top plate 103 to become an arc surface with a slightly convex bottom surface of the head as described above. This design can ensure the quality of the bottom surface of the head. Because in this process, the formation of the bottom surface of the head is through the combined action of the first arc surface 101a of the upper die 101 and the second arc surface 102b of the top plate 103. If the air chamber is sealed, then the circular sheet needs to overcome the atmospheric pressure to deform, which undoubtedly increases the difficulty of forming the bottom surface of the head. The existence of the vent holes 101b well solves this problem.

[0026] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A stamping and forming device for a high-precision flat bottom head, characterized in that: It includes an upper die (101), and the shape of the upper die (101) is cylindrical; the stamping and forming device further includes a lower die (102), and the lower die (102) is provided with a cavity matching the upper die (101); a top plate (103) that can lift relative to the lower die (102) is provided at the bottom of the cavity, and a top cylinder (104) for driving the top plate (103) is provided below the top plate (103).

2. The stamping and forming device for a high-precision flat bottom head according to claim 1, wherein: A first arc surface (101a) concave inward is provided on the bottom surface of the upper die (101), and a second arc surface (102b) convex upward and matching it is provided on the top surface of the top plate (103).

3. The stamping and forming device for a high-precision flat bottom head according to claim 2, wherein: The bottom edge of the upper die (101) has a circular arc chamfer.

4. The stamping and forming device for a high-precision flat bottom head according to claim 3, wherein: Both the bottom edge and the top edge of the cavity are provided with circular arc chamfers.

5. The stamping and forming device for a high-precision flat bottom head according to claim 4, characterized in that: The top plate (103) is a conical plate with a diameter gradually decreasing from top to bottom, and a conical hole (106) matching the top plate (103) is correspondingly provided at the bottom of the lower die (102).

6. The stamping and forming device for a high-precision flat bottom head according to claim 5, characterized in that: Vent holes (101b) are provided on the upper die (101).

7. The stamping and forming device for a high-precision flat bottom head according to claim 6, characterized in that: Positioning steps (102a) are provided on the lower die (102).

8. The stamping and forming device for a high-precision flat bottom head according to claim 7, wherein: A heating device (105) may be provided at the edge of the cavity of the lower die (102).

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