A coreless hydrostatic mold

Abstract

The utility model discloses a kind of water-swollen moulds without mould core, including upper die assembly and lower die assembly, the upper die assembly includes upper cavity, the lower die assembly includes lower cavity, the upper cavity and the lower cavity are respectively inwardly recessed to form recessed part, when the recessed part of the lower cavity and the upper cavity is closed to form water-swollen space.The recessed part of the present application is respectively arranged on the upper cavity and the lower cavity, and the water-swollen space formed by the recessed part, so when product is water-swollen, no scratch is generated on the surface of product such as water cup due to mould core rod.

Description

Technical Field

[0001] This utility model relates to molds, and more particularly to a coreless water expansion mold. Background Technology

[0002] Hydraulic forming (also known as hydroforming or internal high-pressure forming) is an advanced flexible shaping process mainly used to manufacture lightweight metal components with hollow, variable cross-sections, and three-dimensional bending. Its basic principle involves placing a tubular or plate-shaped blank into a closed mold cavity, and then injecting a liquid medium (usually water) into the blank using an ultra-high-pressure water pump. Under internal high pressure, the blank undergoes plastic deformation, ultimately adhering tightly to the inner wall of the mold cavity, thus obtaining a precision part that conforms to the shape of the mold. However, most current hydraulic forming molds use molds with mandrels. When water cups or other products requiring surface precision are hydraulically formed, the mandrel often develops scratches on its surface, leading to a lower yield rate for these products. Therefore, improvements are needed. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies, such as the mold core rod causing scratches on the surface of the water cup, by providing a new type of coreless water expansion mold.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A coreless hydroforming mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper cavity, and the lower mold assembly includes a lower cavity. The upper cavity and the lower cavity are respectively recessed inward to form a recessed portion. When the recessed portions of the lower cavity and the upper cavity are closed, a hydroforming space is formed.

[0005] This application provides recesses directly on the upper and lower cavities, and the water expansion space formed by the recesses prevents scratches on the surface of products such as cups when the product is in water.

[0006] Preferably, in the above-described coreless hydroforming mold, the upper mold assembly further includes an upper mold base plate, and the upper cavity is detachably connected to the upper mold base plate.

[0007] Preferably, in the above-described coreless hydroforming mold, the lower mold assembly further includes a lower mold base plate and a lower mold seat, the lower mold seat being connected to the lower mold base plate, and the lower cavity being disposed on the lower mold seat.

[0008] Preferably, in the above-described coreless hydroforming mold, the lower mold assembly further includes an ejector pin and a pressure plate. The lower mold base plate and the lower mold seat are both provided with first guide holes. The lower mold seat is provided with an installation groove. The pressure plate is disposed in the installation groove. The ejector pin is disposed in the first guide hole, and the lower end of the ejector pin cooperates with the pressure plate.

[0009] Preferably, in the above-described moldless water-expanding mold, the lower mold assembly further includes a guide post. The lower mold base and the lower cavity are both provided with a second guide hole. The guide post is disposed in the second guide hole, and the lower end of the guide post is connected to the lower mold base plate. The upper end of the guide post extends upward into the water-expanding space.

[0010] Preferably, in the above-described moldless water-expanding mold, both the lower mold base plate and the guide post are provided with water guide holes that connect to the water-expanding space.

[0011] Preferably, in the above-described moldless water-expanding mold, a sealing ring is also provided at the position of the guide post near the water-expanding space.

[0012] The present invention has the following advantages through the above structural improvements: Compared with conventional water-expanding molds, this application has the advantage of high yield. In this case, by forming recesses on the upper and lower cavities respectively, and by forming a water-expanding space after the recesses are closed, the mold adopts a moldless mandrel setting, which can effectively avoid the mandrel from scratching the surface of products such as water cups during water expansion, thereby effectively improving the yield of products such as water cups. Attached Figure Description

[0013] Figure 1 This is a longitudinal section diagram of the present invention.

[0014] Reference numerals: 1. Upper mold assembly; 11. Upper cavity; 12. Upper mold base plate; 2. Lower mold assembly; 21. Lower cavity; 22. Lower mold base plate; 23. 231. Mounting groove; Lower mold base; 24. Ejector pin; 25. Pressure plate; 26. Guide post; 261. Sealing ring; 3. Room for water level to rise; 4. First guide hole; 5. Second guide hole; 6. Water guide hole. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the present invention: Example

[0016] like Figure 1 As shown, a coreless hydroforming mold includes an upper mold assembly 1 and a lower mold assembly 2. The upper mold assembly 1 includes an upper cavity 11, and the lower mold assembly 2 includes a lower cavity 21. The upper cavity 11 and the lower cavity 21 are respectively recessed inward to form a recessed portion. When the lower cavity 21 and the recessed portion of the upper cavity 11 are closed, a hydroforming space 3 is formed.

[0017] Preferably, the upper mold assembly 1 further includes an upper mold base plate 12, and the upper cavity 11 is detachably connected to the upper mold base plate 12.

[0018] Specifically, the upper mold base plate 12 facilitates the installation or disassembly of the upper cavity 11 and also improves the stability of the upper cavity 11 after installation. The upper cavity 11 and the upper mold base plate 12 are connected by bolts or the like for detachment.

[0019] Preferably, the lower mold assembly 2 further includes a lower mold base plate 22 and a lower mold seat 23, the lower mold seat 23 being connected to the lower mold base plate 22, and the lower cavity 21 being disposed on the lower mold seat 23.

[0020] Specifically, the lower mold base plate 22 is used for the installation or removal of the lower mold base 23, and the lower mold base 23 is used for the installation or removal of the guide system. The lower mold base 23 and the lower mold base plate 22 are connected in a detachable manner by bolts or the like.

[0021] Preferably, the lower mold assembly 2 further includes an ejector pin 24 and a pressure plate 25. The lower mold base plate 22 and the lower mold seat 23 are both provided with a first guide hole 4. The lower mold seat 23 is provided with a mounting groove 231. The pressure plate 25 is disposed in the mounting groove 231. The ejector pin 24 is disposed in the first guide hole 4, and the lower end of the ejector pin 24 cooperates with the pressure plate 25.

[0022] Specifically, the coordinated use of ejector pins 24 and pressure plate 25 helps the product to be demolded after the water rises, and also ensures the protection of the product's appearance and quality during demolding.

[0023] Preferably, the lower mold assembly 2 further includes a guide post 26. The lower mold base 23 and the lower cavity 21 are both provided with a second guide hole 5. The guide post 26 is disposed in the second guide hole 5, and the lower end of the guide post 26 is connected to the lower mold base plate 22. The upper end of the guide post 26 extends upward into the water expansion space 3.

[0024] Specifically, the second guide hole 5 is provided for the installation of the guide post 26, which can fix the mouth of the cup.

[0025] Preferably, both the lower mold base plate 22 and the guide post 26 are provided with water guide holes 6 that connect to the water expansion space 3.

[0026] Furthermore, the water guide hole 6 is designed to supply water to the water expansion space 3, thereby ensuring the water expansion effect of the product within the water expansion space 3.

[0027] Preferably, the guide post 26 is also provided with a sealing ring 261 near the water expansion space 3.

[0028] Specifically, when the water cup is undergoing water expansion processing through the mold, the sealing ring 261 can seal the water in the water expansion space 3 to prevent water leakage from the mold, which could lead to poor water expansion effect.

[0029] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A coreless hydroforming mold, comprising an upper mold assembly (1) and a lower mold assembly (2), characterized in that: The upper mold assembly (1) includes an upper cavity (11), and the lower mold assembly (2) includes a lower cavity (21). The upper cavity (11) and the lower cavity (21) are recessed inward to form a recessed portion. When the recessed portion of the lower cavity (21) and the upper cavity (11) are closed, a water expansion space (3) is formed.

2. The coreless hydroforming mold according to claim 1, characterized in that: The upper mold assembly (1) also includes an upper mold base plate (12), and the upper cavity (11) is detachably connected to the upper mold base plate (12).

3. The coreless hydroforming mold according to claim 1, characterized in that: The lower mold assembly (2) further includes a lower mold base plate (22) and a lower mold base (23), the lower mold base (23) being connected to the lower mold base plate (22), and the lower cavity (21) being disposed on the lower mold base (23).

4. The coreless hydraulic expansion mold according to claim 3, characterized in that: The lower mold assembly (2) also includes an ejector pin (24) and a pressure plate (25). The lower mold base plate (22) and the lower mold seat (23) are both provided with a first guide hole (4). The lower mold seat (23) is provided with a mounting groove (231). The pressure plate (25) is disposed in the mounting groove (231). The ejector pin (24) is disposed in the first guide hole (4), and the lower end of the ejector pin (24) cooperates with the pressure plate (25).

5. A coreless hydroforming mold according to claim 3, characterized in that: The lower mold assembly (2) also includes a guide post (26). The lower mold base (23) and the lower cavity (21) are both provided with a second guide hole (5). The guide post (26) is disposed in the second guide hole (5), and the lower end of the guide post (26) is connected to the lower mold base plate (22). The upper end of the guide post (26) extends upward into the water expansion space (3).

6. A coreless hydroforming mold according to claim 5, characterized in that: Both the lower mold base plate (22) and the guide column (26) are provided with water guide holes (6) that connect to the water expansion space (3).

7. A coreless hydroforming mold according to claim 5, characterized in that: The guide post (26) is also provided with a sealing ring (261) near the water expansion space (3).

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