Clamping device for airtightness testing of magnesium alloy castings

Abstract

This utility model discloses a clamping device for airtightness testing of magnesium alloy castings, including a base frame, a top frame disposed above the base frame, multiple support columns connecting the top frame and the base frame, and multiple clamping plate assemblies disposed on the base frame. A first threaded hole is formed through the center of the top frame, and a first sealing gasket is connected to the center of the bottom end of the top frame through the first threaded hole and fitted with a first sealing screw. Second and third threaded holes are formed through the support columns, with a second sealing gasket connected to the second threaded hole through a second sealing screw, and a sealing plate connected to the third threaded hole through a third sealing screw. A first valve is disposed at the center of the base frame. This device solves the problems of cumbersome and laborious testing of existing tooling, improves testing efficiency, accurately seals to reduce the risk of missed detections, reduces cost waste and delivery impact caused by defective products, and is adaptable to various casting specifications, improving testing applicability and reliability, ensuring product quality, and possessing good practicality.

Description

Technical Field

[0001] This utility model belongs to the field of tooling technology for magnesium alloy castings, specifically relating to a clamping device for airtightness testing of magnesium alloy castings. Background Technology

[0002] In recent years, my country's casting industry has achieved rapid development in fields such as aerospace engines and automobile engines. Quality control of related cast parts is of paramount importance, and airtightness, as a key quality indicator, is an essential testing process.

[0003] Currently, the air tightness of the above-mentioned castings after processing is usually verified by air tightness pressure test. However, the existing casting air tightness testing fixtures are heavy, which makes the testing process time-consuming and labor-intensive. Furthermore, if the processed parts fail the air tightness test, it will result in a waste of processing costs and an adverse impact on product delivery. Therefore, there is an urgent need for a dual-cavity air tightness testing method for magnesium alloy castings. Utility Model Content

[0004] To address some or all of the technical problems existing in the prior art, this utility model provides a clamping device for airtightness testing of magnesium alloy castings. The clamping device includes a base frame, a top frame disposed above the base frame, multiple support columns connecting the top frame and the base frame, and multiple clamping plate assemblies disposed on the base frame, wherein:

[0005] The top frame is connected to the top of the support column by mounting bolts. A first threaded hole is opened through the center of the top frame. A first sealing gasket is connected to the center of the bottom end of the top frame by a first sealing screw fitting in the first threaded hole.

[0006] Multiple support columns are symmetrically arranged along the length and width of the base frame. A second threaded hole is opened through the support column arranged along the width direction. A second sealing gasket is connected to the second threaded hole through the second sealing screw. A third threaded hole is opened through the support column arranged along the length direction. A sealing plate is connected to the third threaded hole through the third sealing screw. The two sealing plates are symmetrically arranged with each other, and the two second sealing gaskets are staggered with each other.

[0007] The clamping plate assembly includes a U-shaped frame disposed on the outside of the base frame, a clamping screw threaded to the bottom end of the U-shaped frame, and a first valve stem disposed at the center of the base frame.

[0008] Furthermore, in the aforementioned clamping device for airtightness testing of magnesium alloy castings, the top frame is a cross-shaped frame.

[0009] In one specific embodiment, in the above-mentioned airtightness testing clamping device for magnesium alloy castings, a second valve is provided on the second sealing gasket.

[0010] In one specific embodiment, in the above-mentioned airtightness testing clamping device for magnesium alloy castings, both the first valve and the second valve are connected to an air source via pipes.

[0011] In one specific embodiment, the number of clamping plate assemblies in the above-mentioned airtightness testing clamping device for magnesium alloy castings is 4 to 8.

[0012] The airtightness testing clamping device for magnesium alloy castings of this utility model has the following advantages and beneficial effects:

[0013] This device features a simple structure and easy assembly / disassembly. An adjustable sealing screw and a staggered, symmetrical sealing structure ensure reliable sealing and prevent stress concentration. The dual-valve design accommodates dual-chamber testing requirements. The clamping plate assembly provides stable clamping to prevent displacement, and all components are detachable for easy maintenance. It solves the problems of cumbersome and labor-intensive testing found in existing tooling, improves testing efficiency, and ensures precise sealing to reduce the risk of missed detections. This reduces cost waste and delivery impact caused by defective products. Furthermore, it is compatible with various casting specifications, enhancing testing applicability and reliability, ensuring product quality, and demonstrating excellent practicality. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0015] Figure 1 This is a schematic diagram of the structure of the airtightness testing clamping device for magnesium alloy castings according to this utility model.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1-Base frame, 2-Top frame, 21-Mounting bolt, 3-Support column, 4-Clamping plate assembly, 41-U-shaped frame, 42-Clamping screw, 5-First sealing gasket, 51-First sealing screw, 6-Second sealing gasket, 61-Second sealing screw, 7-Sealing plate, 71-Third sealing screw, 8-First valve, 9-Second valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] like Figure 1As shown, this utility model discloses a clamping device for airtightness testing of magnesium alloy castings, including a base frame 1, a top frame 2 disposed above the base frame 1, multiple support columns 3 connecting the top frame 2 and the base frame 1, and multiple clamping plate assemblies 4 disposed on the base frame 1. The top frame 2 is connected to the top of the support column 3 by mounting bolts 21. This detachable connection facilitates the assembly, disassembly, and maintenance of the device. A first threaded hole is formed through the center of the top frame 2. A first sealing gasket 5 is connected to the center of the bottom end of the top frame 2 through the first threaded hole by a first sealing screw 51. By rotating the first sealing screw 51, the fit between the first sealing gasket 5 and the top of the casting can be adjusted to ensure a tight seal, effectively preventing gas leakage from the top and ensuring the accuracy of the test. The multiple support columns 3 are symmetrically arranged along the length and width directions of the base frame 1. This symmetrical layout ensures uniform force distribution on the device, improves stability during the testing process, and avoids deformation of the device or displacement of the casting due to uneven force distribution, which would affect the sealing effect. A second threaded hole is formed through the support column 3 along the width direction. A second sealing gasket 6 is connected to the hole via a second sealing screw 61. By rotating the second sealing screw 61, the contact force between the second sealing gasket 6 and the corresponding side of the casting in the width direction can be adjusted to ensure the sealing effect of this part. A third threaded hole is opened through the support column 3 along the length direction. A sealing plate 7 is connected to the third threaded hole via a third sealing screw 71. By adjusting the third sealing screw 71, the two sealing plates 7 can be tightly attached to the casting from both sides in the length direction of the casting to further enhance the sealing performance. The two sealing plates 7 are symmetrically arranged, and the two second sealing gaskets 6 are staggered. The staggered arrangement can avoid stress concentration caused by overlapping sealing areas, while expanding the sealing coverage and improving the reliability of the seal. Of course, the setting positions of the first sealing gasket 5, the second sealing gasket 6, and the sealing plate 7 need to be set according to the specific working conditions such as the specifications and dimensions of the casting during actual use. The clamping plate assembly 4 includes a U-shaped frame 41 set on the outside of the base frame 1 and a clamping screw 42 threaded to the bottom end of the U-shaped frame 41. During the inspection process, by rotating the clamping screw 42, the U-shaped frame 41 can be tightly attached to the casting in the width direction of the casting to ensure the sealing effect of this part. The mold frame clamps and fixes the casting placed on the base frame 1, preventing the casting from shifting during the inflation or immersion in the medium water, ensuring the stability of the sealing position, and thus ensuring the validity of the test results. The base frame 1 is provided with a first air valve 8 in the center, which is used to fill the casting with compressed gas.

[0020] Furthermore, in the airtightness testing clamping device for magnesium alloy castings of this utility model, the top frame 2 is a cross-shaped frame. This design not only ensures the structural strength of the top frame 2, but also achieves stable sealing of the top of the casting while reducing weight.

[0021] In one specific embodiment, in the airtightness testing clamping device for magnesium alloy castings of this utility model, a second valve 9 is provided on the second sealing gasket 6. The second valve 9 can cooperate with the first valve 8 to achieve multi-directional air inflation, thereby meeting the dual-cavity testing requirements of the casting.

[0022] In one specific embodiment, in the airtightness testing clamping device for magnesium alloy castings of this utility model, both the first air valve 8 and the second air valve 9 are connected to an air source through pipes.

[0023] In one specific embodiment, in the airtightness testing clamping device for magnesium alloy castings of this utility model, the number of clamping plate assemblies 4 is 4 to 8, more specifically, the number of clamping plate assemblies 4 is 5. Of course, the number of clamping plate assemblies 4 needs to be set according to the specific working conditions such as the shape and size of the casting in actual use.

[0024] The working principle of the airtightness testing clamping device for magnesium alloy castings of this utility model is as follows:

[0025] Before conducting an airtightness test, the operator needs to be familiar with the airtightness test process requirements of the castings being produced. Then, check the water used for the airtightness test. It must be clear and free of suspended matter, air bubbles, and solid particles. Check the flatness of the sealing surface of the casting to ensure that there is no air leakage at the sealing surface after sealing. Check each frame and clamp assembly 4 to ensure that the structure is intact and that there are no impurities or damage on the sealing gaskets. Finally, check that the air source is operating normally.

[0026] During the airtightness test, the magnesium alloy casting to be tested is precisely placed above the base frame 1 according to the process requirements. Then, the top frame 2 is installed above the support column 3 and the magnesium alloy casting using mounting bolts 21, ensuring that the sealing position of the casting corresponds to the positions of the various sealing gaskets and sealing plates 7 of this device. The clamping plate assembly 4, the first sealing screw 51, the second sealing screw 61, the third sealing screw 71, and the mounting bolts 21 are assembled into their corresponding positions according to the process requirements. Then, each connecting component is tightened sequentially using a pneumatic wrench. During tightening, it is important to apply even pressure to avoid over-tightening, which could damage the seals or deform the casting. Simultaneously, ensure that all sealing parts fit tightly to form a sealed space. Start the air source and inject compressed gas at the set pressure into the casting through the first air valve 8 and the second air valve 9. At this point, a careful inspection is required. Check for air leaks at all contact points between the casting and the tooling. If any leaks are found, immediately stop the inflation process. Check if the seals are properly installed and if there are any impurities or defects on the sealing surface. Tighten or replace the relevant parts and check again until there are no leaks at the seal. Once it is confirmed that there are no leaks at the seal, place the device along with the casting into a container filled with water, ensuring the casting is completely submerged. Observe the surface of the casting underwater for any bubbles. If bubbles appear, it indicates that there is a leak in the casting and the airtightness is not up to standard. If no bubbles appear, it indicates that the airtightness of the casting meets the requirements. After the airtightness check of the casting is completed, first turn off the air source and release the gas in the tooling. Then, disassemble the device in the reverse order of assembly, remove the casting, and clean the water stains and impurities from all parts of the device for future use.

[0027] In summary, compared with the prior art, the airtightness testing clamping device for magnesium alloy castings of this utility model has the following advantages and beneficial effects:

[0028] This device features a simple structure and easy assembly / disassembly. An adjustable sealing screw and a staggered, symmetrical sealing structure ensure reliable sealing and prevent stress concentration. The dual-valve design accommodates dual-chamber testing requirements. The clamping plate assembly 4 provides stable clamping to prevent displacement, and all components are detachable for easy maintenance. It solves the problems of cumbersome and labor-intensive testing found in existing fixtures, improves testing efficiency, and ensures precise sealing to reduce the risk of missed detections. This reduces cost waste and delivery disruptions caused by defective products. Furthermore, it is compatible with various casting specifications, enhancing testing applicability and reliability, ensuring product quality, and demonstrating excellent practicality.

[0029] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement state shown in the accompanying drawings.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A clamping device for airtightness testing of magnesium alloy castings, characterized in that, The airtightness testing clamping device for magnesium alloy castings includes a base frame, a top frame mounted above the base frame, multiple support columns connecting the top frame and the base frame, and multiple clamping plate assemblies mounted on the base frame, wherein: The top frame is connected to the top of the support column by mounting bolts. A first threaded hole is opened through the center of the top frame. A first sealing gasket is connected to the center of the bottom end of the top frame by a first sealing screw fitting in the first threaded hole. Multiple support columns are symmetrically arranged along the length and width of the base frame. A second threaded hole is opened through the support column arranged along the width direction. A second sealing gasket is connected to the second threaded hole through the second sealing screw. A third threaded hole is opened through the support column arranged along the length direction. A sealing plate is connected to the third threaded hole through the third sealing screw. The two sealing plates are symmetrically arranged with each other, and the two second sealing gaskets are staggered with each other. The clamping plate assembly includes a U-shaped frame disposed on the outside of the base frame, a clamping screw threaded to the bottom end of the U-shaped frame, and a first valve stem disposed at the center of the base frame.

2. The airtightness testing clamping device for magnesium alloy castings according to claim 1, characterized in that, The top frame is a cross-shaped frame.

3. The airtightness testing clamping device for magnesium alloy castings according to claim 1, characterized in that, A second valve is provided on the second sealing gasket.

4. The airtightness testing clamping device for magnesium alloy castings according to claim 3, characterized in that, Both the first and second valves are connected to an air source via pipes.

5. The airtightness testing clamping device for magnesium alloy castings according to claim 1, characterized in that, The number of clamping plate assemblies is 4 to 8.

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