A tensile test specimen preparation die with piston exhaust structure

Abstract

The application discloses a tensile test sample preparation mold with a piston exhaust structure, which comprises a bottom plate, side plates, a piston, a cover plate and a glue injection port. The side plates comprise a first side plate and a second side plate which are oppositely and parallelly arranged on the bottom plate; the first side plate and the second side plate are detachably fixed on the bottom plate; the piston is slidably arranged between the first side plate and the second side plate, and the outer contour of the piston is in sealing cooperation with the inner side walls of the first side plate and the second side plate; wherein, when the piston is in an initial position, the piston, the bottom plate, the first side plate and the second side plate jointly form one end of a mold cavity; the cover plate is detachably covered on the first side plate and the second side plate; and the glue injection port is arranged through the piston and communicates with the mold cavity. Through the piston slidable exhaust structure, the application effectively solves the problem that the corner bubbles of high thixotropic adhesive are difficult to exhaust during the injection molding process, and significantly improves the preparation quality of the tensile test sample and the accuracy of the test data.

Description

Technical Field

[0001] This application belongs to the field of tensile module manufacturing technology, and in particular relates to a tensile test strip preparation mold with a piston venting structure. Background Technology

[0002] Tensile test specimens are standard samples used to determine the basic mechanical properties of materials, such as tensile strength, tensile modulus, and maximum elongation. Their preparation quality directly affects the accuracy and reliability of test data. For adhesives, defects, especially air bubbles, within the specimen can lead to stress concentration, causing significant deviations in test results. Currently, most commercially available mold-making devices employ a structure with a closed bottom and sides, and only a pre-drilled nozzle at the top. This type of mold is well-suited for low-viscosity, low-thixotropic adhesives, offering ease of operation and good results. However, when dealing with high-viscosity, high-thixotropic adhesives, this type of mold exhibits significant limitations: the adhesive is difficult to fully level and wet the mold edges, easily trapping air and forming bubbles. Practice shows that even with vacuum-assisted degassing, these edge bubbles are difficult to eliminate effectively. Furthermore, high-thixotropic adhesives lack self-leveling properties; after bubbles burst, the resulting surface pores cannot self-repair, leading to structural defects in the cured specimen, which fails to meet the requirements of accurate testing. Utility Model Content

[0003] To address the shortcomings of the prior art, this application provides a tensile test specimen preparation mold with a piston venting structure. The piston sliding venting structure solves the problem of air bubbles being difficult to expel during the injection molding process.

[0004] To achieve the above objectives, this application provides a tensile test specimen preparation mold with a piston venting structure, comprising: a base plate 100 and side plates 200; the side plates 200 include a first side plate 210 and a second side plate 220 disposed opposite to and parallel to the base plate 100; the first side plate 210 and the second side plate 220 are detachably fixed to the base plate 100; the preparation mold further includes:

[0005] Piston 300; the piston 300 is slidably disposed between the first side plate 210 and the second side plate 220, and its outer contour forms a sealing fit with the inner sidewalls of the first side plate 210 and the second side plate 220; wherein, in its initial position, the piston 300, together with the base plate 100, the first side plate 210, and the second side plate 220, constitutes one end of the mold cavity. Cover plate 400; the cover plate 400 is detachably covered on the first side plate 210 and the second side plate 220. And injection port 500; the injection port 500 is disposed through the piston 300 and communicates with the mold cavity.

[0006] In this application, the cover plate 400 includes a main cover plate 410, and a first side cover plate 420 and a second side cover plate 430 on opposite sides of the main cover plate 410; a plurality of positioning holes 700 are provided on the main cover plate 410, the side plate 200, and the bottom plate 100 for aligning the main cover plate 410 with the side plate 200 and the bottom plate 100, so as to detachably fix the main cover plate 410 to the side plate 200.

[0007] Furthermore, the main cover plate 410, the first side cover plate 420 and the second side cover plate 430 are separate structures; the first side cover plate 420 and the first side plate 210, as well as the second side cover plate 430 and the second side plate 220, are movably connected by slide grooves and slide rails.

[0008] In this application, the preparation mold further includes:

[0009] Insert plate 600; the insert plate 600 includes a first insert plate 610 and a second insert plate 620, the first insert plate 610 being detachably inserted between the first side cover plate 420 and the main cover plate 410; the second insert plate 620 being detachably inserted between the second side cover plate 430 and the main cover plate 410.

[0010] In this application, the base plate 100, the first side plate 210, the second side plate 220, the cover plate 400, the piston 300, and the insert plate 600 are all made of rigid plastic.

[0011] In this application, the piston 300 is fitted with a sealing ring, and the sealing ring contacts the inner sidewalls of the first side plate 210 and the second side plate 220 to form the sealing fit.

[0012] Compared with the prior art, the advantages of this application are as follows:

[0013] This application proposes a tensile test specimen preparation mold with a piston venting structure. Through an innovative integrated design of a sliding piston and an injection port, it achieves simultaneous injection and venting. During injection, the adhesive pushes the piston to move, actively expelling air from the mold cavity through the gap between the piston and the side plate in real time. This fundamentally solves the technical problem of difficulty in venting air bubbles from the corners of high-viscosity, high-thixotropic adhesives during the injection process, significantly improving the density and integrity of the tensile test specimen. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of a mold for preparing a tensile test specimen with a piston venting structure, according to one embodiment of this application.

[0015] Figure 2An exploded view of a mold for preparing a tensile test specimen with a piston venting structure according to an embodiment of this application.

[0016] Figure 3 This is a front view of a mold for preparing a tensile test specimen with a piston venting structure, according to an embodiment of this application.

[0017] Figure 4 This is a side view of a mold for preparing a tensile test specimen with a piston venting structure, according to an embodiment of this application.

[0018] Figure 5 This is a top view of a mold for preparing a tensile test specimen with a piston venting structure, according to one embodiment of this application.

[0019] Among them, 100-base plate; 200-side plate; 210-first side plate; 220-second side plate; 300-piston; 400-cover plate; 410-main cover plate; 420-first side cover plate; 430-second side cover plate; 500-glue injection port; 600-insertion plate; 610-first insertion plate; 620-second insertion plate; 700-positioning hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] Example 1:

[0022] As attached Figure 1 As shown, in order to solve the above-mentioned technical problems, this application provides a tensile test specimen preparation mold with a piston exhaust structure, including: a base plate 100 and a side plate 200; the side plate 200 includes a first side plate 210 and a second side plate 220 disposed opposite to and parallel to the base plate 100; the first side plate 210 and the second side plate 220 are detachably fixed to the base plate 100.

[0023] As attached Figure 2 , attached Figure 3 Appendix Figure 4 and attached Figure 5 The figures shown are an exploded view and a three-view drawing of the fabrication mold according to an embodiment of this application. The fabrication mold described in this application further includes:

[0024] Piston 300; the piston 300 is slidably disposed between the first side plate 210 and the second side plate 220, and its outer contour forms a sealing fit with the inner sidewalls of the first side plate 210 and the second side plate 220; wherein, in its initial position, the piston 300, together with the base plate 100, the first side plate 210, and the second side plate 220, constitutes one end of the mold cavity. Cover plate 400; the cover plate 400 is detachably covered on the first side plate 210 and the second side plate 220. And injection port 500; the injection port 500 is disposed through the piston 300 and communicates with the mold cavity.

[0025] It should be noted that the base plate 100 is a flat, rigid plastic plate, which serves as the installation base for the entire mold. The specific size and shape of the mold can be customized according to the shape and size of the tensile test specimen.

[0026] Preferably, the base plate 100 can be a rectangular plate, preferably made of rigid plastics such as polypropylene or acrylonitrile-butadiene-styrene copolymer. Its surface is flat, and several mounting holes for fixing to the side plate 200 can be opened at the four corners and the center of the edges.

[0027] The base plate 100 serves as the mounting base for the entire mold, providing stable support and positioning reference for all other components. It ensures the rigidity and stability of the overall mold structure, guarantees the geometric accuracy of the forming cavity, and prevents spline dimensional errors caused by base plate deformation.

[0028] It should be noted that the injection port 500 in this embodiment can be configured as a circular through-hole penetrating the piston 300. Its inlet is located on the outer end face of the piston 300, and its outlet leads to the mold cavity formed by the base plate 100, side plate 200, and the initial position of the piston 300. In this application, the piston venting mechanism, where the adhesive pushes the piston during injection to expel air behind it, is implemented by designing the injection port through the piston. The adhesive is injected directly into the mold cavity from the piston's hole, pushing the piston backward. The piston acts like a large syringe plunger, expelling the air behind it.

[0029] Preferably, the injection port 500 can be a round hole with a diameter of 2-5mm, but is not limited to this.

[0030] In this embodiment, the side plate 200 includes a first side plate 210 and a second side plate 220. The first side plate 210 and the second side plate 220 may be made of polypropylene. They are erected on the base plate 100 in a relatively parallel manner and are detachably connected as a whole by aligning the holes provided on their bottoms with the corresponding holes on the base plate 100 and binding them with nylon cable ties.

[0031] Preferably, the first side plate 210 and the second side plate 220 are two parallel rectangular plates, also made of rigid plastic. They are aligned with corresponding structures, such as grooves or holes, on the base plate 100 via protrusions or holes on their bottoms, and are detachably fastened together with bolts or cable ties. The inner walls of both are smooth and flat, and strictly parallel, to form the two sides of a standard spline.

[0032] The two side plates and the base plate together form the three fixed boundaries of the mold cavity, determining the width and thickness of the template. The detachable connection facilitates mold assembly, cleaning, and maintenance. The parallelism and smoothness of its inner sidewalls directly ensure the quality and dimensional accuracy of the template sidewalls.

[0033] It should be noted that the piston 300 in this embodiment can be made of polytetrafluoroethylene (PTFE). It is slidably positioned between the first side plate 210 and the second side plate 220 at an initial position for further adhesive injection. The initial position can be at the end of the same end of the first side plate 210 and the second side plate 220. The outer contour dimensions of the piston 300 are precisely designed to form an interference fit with the inner walls of the first side plate 210 and the second side plate 220, thereby achieving a seal.

[0034] In this application, the piston 300 is fitted with a sealing ring, and the sealing ring contacts the inner sidewalls of the first side plate 210 and the second side plate 220 to form the sealing fit.

[0035] In another preferred embodiment, the piston 300 has a groove and a sealing ring embedded therein. The sealing ring is made of flexible silicone material and is in close contact with the inner walls of the first side plate 210 and the second side plate 220 to form a better dynamic sealing fit. When the piston 300 is in its initial position, its inner end face together with the bottom plate 100, the first side plate 210 and the second side plate 220 forms one end of the mold cavity for forming the template.

[0036] Preferably, the piston 300 is a rectangular block, and its outer contour dimension is interference-fitted with the space gap formed by the first and second side plates. The piston 300 has an annular groove around its periphery and is fitted with an O-ring seal. The O-ring seal is made of elastic material such as silicone or fluororubber, so that it maintains tight contact with the inner sidewalls of the two side plates.

[0037] The piston serves as a movable end wall of the mold cavity. Its sealed interface allows compressed air molecules to escape microscopically under pressure, while effectively blocking the passage of high-viscosity adhesive liquid, thus achieving the core function of dynamic venting. During adhesive injection, the adhesive liquid pushes the piston to move, continuously compressing and expelling the air behind the piston, thereby completely avoiding the generation of air bubbles, and especially solving the problem of venting at the edges and corners of highly thixotropic adhesives.

[0038] In this application, the cover plate 400 includes a main cover plate 410, and a first side cover plate 420 and a second side cover plate 430 on opposite sides of the main cover plate 410; a plurality of positioning holes 700 are provided on the main cover plate 410, the side plate 200, and the bottom plate 100 for aligning the main cover plate 410 with the side plate 200 and the bottom plate 100, so as to detachably fix the main cover plate 410 to the side plate 200.

[0039] Furthermore, the main cover plate 410, the first side cover plate 420 and the second side cover plate 430 are separate structures; the first side cover plate 420 and the first side plate 210, as well as the second side cover plate 430 and the second side plate 220, are movably connected by slide grooves and slide rails.

[0040] It should be noted that in this embodiment, the cover plate 400 can be detachably fitted onto the first side plate 210 and the second side plate 220 through the positioning hole 700 and the connecting piece, preferably a screw. The cover plate 400 includes a main cover plate 410, and a first side cover plate 420 and a second side cover plate 430 connected to opposite sides of the main cover plate 410 by a split structure. The split structure means that these three are not a single unit, but a detachable connection structure. The first side cover plate 420 and the second side cover plate 430 can slide outwards to open or slide inwards to close, like a door, by means of sliding grooves and rails.

[0041] Preferably, the main cover plate 410 is a central rectangular plate used to cover the main body of the mold cavity. The first side cover plate 420 and the second side cover plate 430 are located in the same plane as the main cover plate 410.

[0042] In this embodiment, a sliding groove is installed at the bottom of the first side cover plate 420 and the second side cover plate 430, and a sliding rail is installed at the top of the first side plate 210 and the second side plate 220 respectively. The first side cover plate 420 and the second side cover plate 430 can be pushed open to both sides by means of the sliding groove and the sliding rail.

[0043] The main cover plate prevents glue spillage and contamination. The openable side cover plate design facilitates the insertion and removal of subsequent insert plates. The cover plate assembly structure enables controllable opening and closing of the top of the mold cavity. In this embodiment, the use of a slide groove and slide rail is simple and reliable, ensuring the positional accuracy of the side cover plate during rotation and creating an accurate insertion channel for the insert plate.

[0044] In this application, the preparation mold further includes:

[0045] Insert plate 600; the insert plate 600 includes a first insert plate 610 and a second insert plate 620, the first insert plate 610 being detachably inserted between the first side cover plate 420 and the main cover plate 410; the second insert plate 620 being detachably inserted between the second side cover plate 430 and the main cover plate 410.

[0046] It should be noted that in this embodiment, the insert plate 600 includes a first insert plate 610 and a second insert plate 620, both of which can be made of rigid plastic. The first insert plate 610 and the second insert plate 620 are detachably inserted into the gap between the main cover plate 410 and the first side cover plate 420 and the second side cover plate 430. The function of the first insert plate 610 and the second insert plate 620 is to control the shape of the tensile test specimen area and to facilitate the removal of the edge portion, avoiding defects such as bubbles after edge curing.

[0047] Preferably, the first insert plate 610 and the second insert plate 620 can be two thin, long plates made of a rigid and low-adhesion material such as polytetrafluoroethylene. They can be inserted into the gaps formed by the main cover plate 410 and the opened first and second side cover plates, respectively. After insertion, the insert plates are parallel to the side plates, which is equivalent to adding two movable partitions on both sides of the mold cavity, thus redefining the boundary of the mold cavity.

[0048] In this embodiment, the core function of the first insert plate 610 and the second insert plate 620 is to precisely control the shape of the effective stretching area of ​​the final template, such as a dumbbell shape. After demolding, the parts of the template that contact the insert plates on both sides are "process edges" that may have defects or unevenness. These need to be cut off along the boundaries formed by the insert plates, and the middle part that is finally retained is a defect-free template with standard dimensions and uniform texture. This is a finishing strategy of "post-forming trimming".

[0049] In this application, the base plate 100, the first side plate 210, the second side plate 220, the cover plate 400, the piston 300, and the insert plate 600 are all made of rigid plastic.

[0050] Preferably, the base plate 100, the first side plate 210, the second side plate 220, the main cover plate 410, the first side cover plate 420, the second side cover plate 430, and the insert plate 600 can all be made of polypropylene; the piston 300 can be made of polytetrafluoroethylene; and the cover plate 400 can be made of polymethyl methacrylate to achieve a transparent real-time observation effect.

[0051] In summary, the preparation mold proposed in this application, through the linkage design of the piston, injection port, and sealing mechanism, achieves the dynamic venting of air bubbles by pushing the piston during injection. Furthermore, the ingenious combination of the openable side cover and the insert plate enables precise definition and subsequent trimming of the effective area of ​​the sample, jointly ensuring the high quality and high standards of the final test sample.

[0052] Example 2:

[0053] The main working principle and mold preparation method of this application embodiment are as follows:

[0054] First, place the base plate 100 horizontally, and insert and fix the first side plate 210 and the second side plate 220 into the holes set on the upper surface of the base plate 100. Manually push the piston 300 into the initial position set between the first side plate 210 and the second side plate 220. This initial position corresponds to the glue injection port for easy glue injection operation.

[0055] Subsequently, the main cover plate 410 is placed on top of the side plate 200, and the first side cover plate 420 and the second side cover plate 430 are closed and gently secured with temporary clips or cable ties. The high thixotropic adhesive that has undergone defoaming treatment is loaded into the dispensing equipment, and an appropriate dispensing head is selected and aligned with the dispensing port 500 for dispensing.

[0056] During injection, the adhesive enters the mold cavity and generates pressure, pushing the piston 300 backward, that is, slowly sliding away from the mold cavity. During this process, compressed air escapes microscopically from the sealing interface between the piston 300 and the side plate 200 under pressure, while the high-viscosity adhesive is effectively sealed and blocked. When the piston 300 retracts to the end of its stroke, the mold cavity is completely filled with adhesive.

[0057] At this point, open the first side cover plate 420 and the second side cover plate 430, and insert the first insert plate 610 and the second insert plate 620 into the gaps between the main cover plate 410 and the two side cover plates, respectively. Then close and clamp the two side cover plates to firmly fix the insert plate 600. The function of the first insert plate 610 and the second insert plate 620 is to control the shape of the tensile test specimen area and facilitate the removal of the edge portion, avoiding defects such as bubbles after edge curing.

[0058] Finally, place the entire mold in an oven at a predetermined temperature to allow the adhesive to cure. Once cured, remove all fasteners, open the cover plate 400, remove the insert plate 600, and detach the formed stretch module from the mold.

[0059] It should be noted that the two sides of the tensile module are not flat, but this does not affect the test results. If necessary, they can be cut off. For example, by using a knife along the imprint formed on the rubber strip by the first insert plate 610 and the second insert plate 620 as a reference, the edge parts on both sides that may have defects can be cut off to obtain a tensile test strip with standard size, uniform texture and no bubbles.

[0060] In summary, the preparation mold described in this embodiment, through its unique piston-sliding venting structure, utilizes injection pressure to drive the piston during operation, simultaneously completing the filling of the adhesive and the venting of gas. This fundamentally overcomes the technical bottleneck of the inability to expel air bubbles from the corners of high-thixotropic adhesives in traditional static molds. Its operation integrates injection, venting, and shaping, and finally, the insert plate positions and removes any edges that may contain defects, ultimately obtaining a well-shaped, dense, bubble-free standard specimen. This device not only effectively improves the accuracy and reliability of test data but also possesses the advantages of ingenious structure, simple operation, and strong applicability, providing an innovative solution to the problem of preparing high-viscosity material samples.

[0061] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, 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, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0062] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application for those skilled in the art.

Claims

1. A mold for preparing tensile test specimens with a piston venting structure, comprising: A base plate (100) and side plates (200); the side plates (200) include a first side plate (210) and a second side plate (220) disposed opposite to and parallel to the base plate (100); the first side plate (210) and the second side plate (220) are detachably fixed to the base plate (100); characterized in that the preparation mold further includes: Piston (300); The piston (300) is slidably disposed between the first side plate (210) and the second side plate (220), and its outer contour forms a sealing fit with the inner sidewalls of the first side plate (210) and the second side plate (220); wherein, when the piston (300) is in its initial position, it together with the bottom plate (100), the first side plate (210) and the second side plate (220) constitute one end of the mold cavity; Cover plate (400); the cover plate (400) is detachably fitted over the first side plate (210) and the second side plate (220); And a glue injection port (500); the glue injection port (500) is provided through the piston (300) and communicates with the mold cavity.

2. The tensile test specimen preparation mold with piston venting structure according to claim 1, characterized in that, The cover plate (400) includes a main cover plate (410), and a first side cover plate (420) and a second side cover plate (430) on opposite sides of the main cover plate (410); a plurality of positioning holes (700) are provided on the main cover plate (410), the side plate (200) and the bottom plate (100) for aligning the main cover plate (410) with the side plate (200) and the bottom plate (100) so as to detachably fix the main cover plate (410) to the side plate (200).

3. The tensile test specimen preparation mold with piston venting structure according to claim 2, characterized in that, The main cover plate (410), the first side cover plate (420), and the second side cover plate (430) are separate structures; The first side cover plate (420) and the first side plate (210), as well as the second side cover plate (430) and the second side plate (220), are movably connected by a slide groove and a slide rail.

4. The tensile test specimen preparation mold with piston venting structure according to claim 3, characterized in that, The preparation mold also includes: Insert plate (600); the insert plate (600) includes a first insert plate (610) and a second insert plate (620), wherein the first insert plate (610) is detachably inserted between the first side cover plate (420) and the main cover plate (410); The second insert plate (620) is detachably inserted between the second side cover plate (430) and the main cover plate (410).

5. The tensile test specimen preparation mold with piston venting structure according to claim 4, characterized in that, The base plate (100), the first side plate (210), the second side plate (220), the cover plate (400), the piston (300), and the insert plate (600) are all made of rigid plastic.

6. The tensile test specimen preparation mold with piston venting structure according to claim 5, characterized in that, The piston (300) is fitted with a sealing ring, which contacts the inner walls of the first side plate (210) and the second side plate (220) to form the sealing fit.

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