Casting mold, casting device and preparation method for tensile specimen preparation

Abstract

The present invention discloses a casting mold, a casting device and a preparation method for tensile specimen preparation, and relates to the technical field of tensile specimen casting. The casting mold allows a casting liquid (such as a vacuum-melted alloy liquid) to enter a casting cavity connected to the casting port through a pouring port, and pours from the bottom of the casting cavity by gravity, and enters other casting cavities after reaching the connected runner. The casting device and the preparation method of the tensile specimen both utilize the above-mentioned casting mold, and multiple tensile specimens can be cast at one time, with high work efficiency; the casting can be performed with the aid of a funnel, and the funnel can be reused, avoiding the need to reprocess the casting riser of the casting mold and saving costs. It is suitable for the casting of a variety of low and medium temperature casting alloys in a vacuum melting environment, and is particularly suitable for the tensile sample casting application of Sn-based solder in the field of electronic packaging under vacuum conditions.

Description

Technical Field

[0001] The invention relates to the technical field of tensile specimen casting, and in particular to a casting mold, a casting device and a preparation method for preparing a tensile specimen. Background Art

[0002] In the field of electronic packaging, tin (Sn)-based low-temperature solder has been widely used as solder paste, tin bars, welding wire products, etc. Among them, the mechanical properties of the welding wire alloy will be explored during the forming period to provide a reference for the wire drawing experiment of the later welding wire products.

[0003] The mechanical properties of solder alloys mainly include tensile strength, elongation, fracture shrinkage, yield strength and hardness, among which tensile strength, elongation and hardness are the most important performance indicators for considering the mechanical properties of alloys. At present, the tensile strength and elongation test of solder alloys generally involves first melting a certain amount of alloy solder, then processing the solder alloy into the required tensile specimen shape through wire cutting, and at the same time sandpapering the surface of the wire cutting specimen to remove the deeper cutting marks on the surface for later tensile strength and elongation tests.

[0004] However, the existing Sn-based tensile specimen preparation process is complicated, the specimen preparation cost is high, the construction period is long, and the sample utilization rate is low. These problems have limited the development of Sn-based solder to a certain extent. Summary of the invention

[0005] The object of the present invention is to provide a casting mold for preparing tensile specimens, so as to improve the working efficiency of preparing tensile specimens and save the cost of preparing tensile specimens.

[0006] Another object of the present invention is to provide a casting device for preparing tensile specimens, which can prepare tensile specimens more efficiently and shorten the specimen preparation cycle.

[0007] The third object of the present invention is to provide a method for preparing a tensile specimen, which is simple and easy to implement, has high preparation efficiency and low cost, and is suitable for industrial application.

[0008] The present invention solves the technical problem by adopting the following technical solutions.

[0009] The present invention proposes a casting mold for preparing tensile specimens, comprising a casting plate, a first clamping side plate and a second clamping side plate. A plurality of casting cavities are arranged on the casting plate at intervals, each casting cavity penetrates the plate surface of the casting plate in the thickness direction of the casting plate, the first clamping side plate and the second clamping side plate are used to clamp on both sides of the casting plate to close the casting cavity; a casting port connected to at least one casting cavity is arranged on one end face of the casting plate, and a connecting runner connecting multiple casting cavities is also arranged on the casting plate.

[0010] In a preferred embodiment, the casting plate has a casting top surface and a supporting bottom surface opposite to the casting top surface, the casting gate extends from the casting top surface into the corresponding casting cavity, and multiple casting cavities are arranged side by side on the plate surface of the casting plate; the connecting runner includes a bottom runner for connecting the bottoms of multiple casting cavities.

[0011] In a preferred embodiment, the connecting runner further comprises a middle runner for connecting the middle parts of the plurality of casting cavities.

[0012] In a preferred embodiment, a side wall of each casting cavity includes a top section, a first arc-shaped transition section, a middle section, a second arc-shaped transition section and a bottom section arranged from top to bottom, and the spacing of the top sections on the two side walls of each casting cavity is greater than the spacing of the middle sections, and the spacing of the bottom sections on the two side walls of each casting cavity is greater than the spacing of the middle sections.

[0013] In a preferred embodiment, the pouring port on the pouring plate is connected to one pouring cavity or two connected pouring cavities; preferably, the number of the pouring cavities is 3-6.

[0014] In a preferred embodiment, the first clamping side plate and the second clamping side plate are both provided with arc-shaped notches matching with the pouring port on the pouring plate, and the arc-shaped notches on the first clamping side plate and the second clamping side plate and the pouring port sieve are insertion ports matching with the bottom of the pouring funnel.

[0015] In a preferred embodiment, it also includes a fixing piece for fixing the first clamping side plate, the second clamping side plate and the casting plate. The first clamping side plate, the second clamping side plate and the casting plate are all provided with fixing holes that match the fixing piece, so that the fixing piece can be fixed by passing through the fixing holes on the first clamping side plate, the second clamping side plate and the casting plate in sequence.

[0016] In a preferred embodiment, a first handle is installed on the end surface of the first clamping side plate away from the casting plate, and a second handle matching with the first handle is installed on the end surface of the second clamping side plate away from the casting plate.

[0017] The present invention also provides a pouring device for preparing tensile specimens, which comprises a pouring funnel and the above-mentioned pouring mold, wherein the discharge port of the pouring funnel matches the pouring port of the pouring mold.

[0018] The present invention also proposes a method for preparing a tensile specimen, which adopts the above-mentioned casting mold for casting, comprising the following steps: pouring a casting liquid into a casting cavity connected to the casting gate through a casting gate, and the casting liquid enters other casting cavities through a connecting runner; preferably, the casting liquid is obtained by vacuum melting of tin-based solder; preferably, the casting liquid is poured into a casting funnel by a 90-degree rotation method, and then enters the casting cavity through the casting gate.

[0019] The beneficial effect of the embodiment of the present invention is as follows: the embodiment of the present invention provides a casting mold for preparing tensile specimens, which allows the casting liquid (such as alloy liquid that has been vacuum melted) to enter the casting cavity connected to the casting gate through the casting port, and pours from the bottom of the casting cavity by gravity, and enters other casting cavities after reaching the connecting runner. The casting mold can cast multiple tensile specimens at a time, and has high work efficiency; the casting can be performed with the help of a funnel, and the funnel can be reused, avoiding the need to reprocess the casting riser of the casting mold and saving costs.

[0020] In addition, during the pouring process, the pouring liquid enters different cavities through the connecting runners, and the filling of the pouring liquid in different cavities basically starts and ends at the same time, which ensures the consistency of the performance of multiple tensile specimens in different cavities and is conducive to standardized production.

[0021] The pouring device for preparing tensile specimens and the method for preparing tensile specimens provided in the embodiments of the present invention both utilize the above-mentioned pouring mold, thereby improving the work efficiency of preparing tensile specimens and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of a pouring device provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the middle casting plate;

[0025] Figure 3 for Figure 1 Structural schematic diagram of the use status of the middle casting plate;

[0026] Figure 4 for Figure 3 Schematic diagram of the structure of the middle casting cavity;

[0027] Figure 5 for Figure 1 A top view of the casting mold;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the first clamping side plate.

[0029] Icons: 10-pouring device; 200-pouring funnel; 100-pouring mold; 001-fixing hole; 110-pouring plate; 111-pouring cavity; 1111-top section; 1112-first arc-shaped transition section; 1113-middle section; 1114-second arc-shaped transition section; 1115-bottom section; 112-pouring gate; 113-connecting runner; 1131-bottom runner; 1132-middle runner; 120-first clamping side plate; 121-arc-shaped notch; 130-second clamping side plate; 140-fixing piece; 150-first handle; 170-insertion port. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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 connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The following is a detailed description of the casting mold, casting device and preparation method for preparing a tensile specimen provided in an embodiment of the present invention.

[0036] Please refer to Figure 1 The embodiment of the present invention provides a pouring device 10 for preparing a tensile specimen, which includes a pouring funnel 200 and the above-mentioned pouring mold 100, and the discharge port of the pouring funnel 200 matches the pouring port 112 of the pouring mold. The pouring funnel can be reused, avoiding the need to reprocess the pouring riser of the pouring mold 100, thereby saving costs.

[0037] Furthermore, the casting mold 100 includes a casting plate 110, a first clamping side plate 120 and a second clamping side plate 130. When in use, the casting plate 110 is clamped by the first clamping side plate 120 and the second clamping side plate 130. After casting, the first clamping side plate 120 and the second clamping side plate 130 are removed to obtain a cast tensile specimen.

[0038] Furthermore, please combine Figure 1-Figure 3, a plurality of casting cavities 111 are arranged at intervals on the casting plate 110, each casting cavity 111 penetrates the plate surface of the casting plate 110 in the thickness direction of the casting plate 110, and the first clamping side plate 120 and the second clamping side plate 130 are used to clamp on both sides of the casting plate 110 to close the casting cavity 111; a pouring port 112 connected to at least one casting cavity 111 is arranged on one end surface of the casting plate 110, and a connecting runner 113 connecting multiple casting cavities 111 is also arranged on the casting plate 110. The pouring liquid (such as alloy liquid after vacuum melting) enters the casting cavity 111 connected to the pouring port 112 through the pouring port 112, and the liquid level starts to rise from the bottom of the casting cavity 111 due to gravity, and enters other casting cavities after reaching the connecting runner. The casting mold can cast multiple tensile specimens at one time, and the working efficiency is high; the casting can be performed with the aid of a funnel, and the funnel can be reused, thereby avoiding the need to reprocess the casting riser of the casting mold and saving costs.

[0039] It should be added that during the pouring process, the pouring liquid enters different cavities through the connecting runner, and the filling of the pouring liquid in different cavities basically starts and ends at the same time, which ensures the consistency of the performance of multiple tensile specimens in different cavities and is conducive to standardized production.

[0040] In a preferred embodiment, the casting plate 110 has a casting top surface and a supporting bottom surface opposite to the casting top surface, and the pouring port 112 extends from the casting top surface to the corresponding casting cavity 111; multiple casting cavities 111 are arranged side by side on the plate surface of the casting plate 110, and the connecting runner 113 includes a bottom runner 1131 for connecting the bottoms of the multiple casting cavities 111. The bottom runner 1131 can make the casting liquid in each casting cavity 111 flow from bottom to top. As long as the alloy liquid can fill the cavity, the gas and slag will float to the surface of the casting liquid because their density is smaller than that of the alloy liquid, and will not remain in the test bar, thereby reducing the occurrence of defects such as slag inclusions and pores in the tensile test bar and improving the yield rate and mechanical properties of the tensile test bar.

[0041] Furthermore, the connecting runner 113 also includes a middle runner 1132 for connecting the middle parts of the multiple casting cavities 111. When the casting cavity 111 rises to the height of the middle runner 1132, the casting material can also be transported to each casting cavity 111 through the middle runner 1132, thereby increasing the casting feeding rate.

[0042] Specifically, the top surface, bottom surface, bottom runner 1131 and middle runner 1132 of the casting cavity 111 all extend in the horizontal direction and are parallel to each other. The bottom runner 1131 and middle runner 1132 can be in the form of a connecting pipe or a groove structure.

[0043] Furthermore, please combine Figure 4, one side wall of each casting cavity 111 includes a top section 1111, a first arc-shaped transition section 1112, a middle section 1113, a second arc-shaped transition section 1114 and a bottom section 1115 arranged from top to bottom, the spacing of the top sections 1111 on the two side walls of each casting cavity 111 is greater than the spacing of the middle sections 1113, and the spacing of the bottom sections 1115 on the two side walls of each casting cavity 111 is greater than the spacing of the middle sections 1113. The specific size of the casting cavity 111 is not limited, and can be processed according to the national standard GB / T 228-2002.

[0044] Furthermore, the pouring port 112 on the pouring plate 110 is connected to one pouring cavity 111 or two connected pouring cavities 111. When the pouring port 112 is connected to one pouring cavity 111, it can be directed to the top of the pouring cavity 111; when the pouring port 112 is connected to two pouring cavities 111, the pouring port 112 can be located in the middle of the two pouring cavities 111, such as Figure 3 shown.

[0045] Furthermore, the number of the casting cavities 111 is 3-6. If the number of the casting cavities is too small, the casting efficiency will be affected. If the number is too large, the performance of the tensile specimen cannot be guaranteed. The number can meet the existing experimental test requirements and can save the alloy material used for casting to the greatest extent.

[0046] Furthermore, please combine Figure 3 , Figure 5 and Figure 6 The structures of the first clamping side plate 120 and the second clamping side plate 130 are substantially the same, and can be fixed by setting fixing holes 001 on the first clamping side plate 120, the second clamping side plate 130 and the casting plate 110, and fixing them by means of fixing members 140 such as positioning pins. When casting is required, the fixing members 140 are sequentially passed through the fixing holes 001 on the first clamping side plate 120, the second clamping side plate 130 and the casting plate 110 for fixing.

[0047] Furthermore, the first clamping side plate 120 and the second clamping side plate 130 are both provided with an arc-shaped notch 121 that matches the pouring port 112 on the pouring plate 110. The arc-shaped notch 121 and the pouring port 112 on the first clamping side plate 120 and the second clamping side plate 130 surround an insertion port 170 that matches the bottom of the pouring funnel 200. When in use, the pouring funnel 200 is placed in the insertion port 170 for pouring, and the pouring funnel 200 can be reused.

[0048] In a preferred embodiment, a first handle 150 is installed on the end surface of the first clamping side plate 120 away from the casting plate 110, and a second handle matching with the first handle 150 is installed on the end surface of the second clamping side plate 130 away from the casting plate 110. After the casting is completed, the first clamping side plate 120 and the second clamping side plate 130 are removed by controlling the first handle 150 and the second handle to take out the molded sample.

[0049] The present invention also proposes a method for preparing a tensile specimen, which uses the above-mentioned casting mold 100 for casting, and includes the following steps: pouring a casting liquid into a casting cavity 111 connected to the casting port 112 through a casting port 112, and the casting liquid enters other casting cavities 111 through a connecting runner 113, and as the casting alloy liquid continues to flow in, the casting cavity 111 is finally filled. Among them, the casting liquid is obtained by vacuum melting of tin-based solder, and the casting liquid is poured into a casting funnel by a 90-degree rotation method, and then enters the casting cavity 111 through the casting port 112. The preparation method has high preparation efficiency and low cost, and is suitable for industrial applications.

[0050] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0051] Example 1

[0052] This embodiment provides a method for preparing a tensile specimen, which uses the casting mold 100 in the attached figure for casting, and pours the Sn-based alloy liquid from the crucible of the controllable mechanical rotation type vacuum melting furnace into the casting funnel 200, and then enters the casting cavity 111 through the pouring port 112, and is poured into other casting cavities 111 using the bottom runner 1131 and the middle runner 1132. In this example, the casting cavity can cast 6 alloy specimens. The cooled casting mold is taken out of the vacuum melting furnace, the fixing screws are removed, the first clamping side plate 120 and the second clamping side plate 130 are separated from the casting cavity 111 by the first and second handles, and then the molded specimen is knocked out of the casting cavity 111. It is worth mentioning that the elastic modulus of the casting mold and the cast Sn-based solder alloy is quite different. After the casting mold is cooled, the Sn58Bi alloy molded specimen can be easily knocked out of the casting mold.

[0053] The excess part of the Sn58Bi alloy molded sample was removed with a vise or other tools, and the final tensile sample was subjected to a tensile test. The tensile strength results of the six tensile samples were: 60.39MPa, 59.97MPa, 60.67MPa, 60.50MPa, 60.70MPa, and 59.94MPa. The results were evenly distributed, which was similar to the tensile strength of the Sn58Bi alloy in reality. It can be seen that the tensile sample prepared in this embodiment has relatively good experimental reliability.

[0054] In summary, the casting mold for preparing tensile specimens provided by the present invention allows the casting liquid (such as alloy liquid that has been vacuum-melted) to enter the casting cavity connected to the casting port through the casting port, and starts to pour from the bottom of the casting cavity by gravity, and enters other casting cavities after reaching the connected runner. The casting mold can cast multiple tensile specimens at a time, with high work efficiency. The tensile specimens can be directly formed and used after casting, saving the process steps of cutting the alloy ingot into the corresponding tensile specimen size and subsequently sanding the tensile specimen after wire cutting with sandpaper to remove the corresponding wire cutting marks in the prior art, and saving the total amount of alloy in the preparation process of the tensile specimen, saving related purchases; the casting can be carried out with the help of a funnel, and the funnel can be reused, avoiding the need to reprocess the casting riser of the casting mold, saving costs.

[0055] The pouring device for preparing tensile specimens and the method for preparing tensile specimens provided in the embodiments of the present invention both utilize the above-mentioned pouring mold, thereby improving the work efficiency of preparing tensile specimens and saving costs.

[0056] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A casting mold for preparing a tensile specimen, characterized in that: The invention comprises a casting plate, a first clamping side plate and a second clamping side plate, wherein a plurality of casting cavities are arranged at intervals on the casting plate, each of the casting cavities penetrates the plate surface of the casting plate in the thickness direction of the casting plate, and the first clamping side plate and the second clamping side plate are used to clamp at two sides of the casting plate to close the casting cavities; A pouring port connected to at least one of the pouring cavities is provided on one end surface of the pouring plate, and a connecting runner connected to a plurality of the pouring cavities is also provided on the pouring plate; The casting plate has a casting top surface and a supporting bottom surface opposite to the casting top surface, the casting port extends from the casting top surface to the corresponding casting cavity, and a plurality of the casting cavities are arranged side by side on the plate surface of the casting plate; the connecting runner includes a bottom runner for connecting the bottoms of the plurality of casting cavities; The connecting runner also includes a middle runner for connecting the middle parts of the plurality of casting cavities; The first clamping side plate and the second clamping side plate are both provided with an arc-shaped notch matching with the pouring port on the pouring plate, and the arc-shaped notch on the first clamping side plate and the second clamping side plate and the pouring port circumference are insertion openings matching with the bottom of the pouring funnel.

2. The casting mold according to claim 1, characterized in that: A side wall of each of the casting cavities includes a top section, a first arc-shaped transition section, a middle section, a second arc-shaped transition section and a bottom section arranged from top to bottom, and the spacing between the top sections on the two side walls of each of the casting cavities is greater than the spacing between the middle sections, and the spacing between the bottom sections on the two side walls of each of the casting cavities is greater than the spacing between the middle sections.

3. The casting mold according to claim 1, characterized in that: The pouring port on the pouring plate is connected to one of the pouring cavities or two connected pouring cavities.

4. The casting mold according to claim 3, characterized in that: The number of the casting cavities is 3-6.

5. The casting mold according to claim 1, characterized in that: It also includes a fixing part for fixing the first clamping side plate, the second clamping side plate and the casting plate. The first clamping side plate, the second clamping side plate and the casting plate are all provided with fixing holes that match the fixing part, so that the fixing part can be fixed by passing through the fixing holes on the first clamping side plate, the second clamping side plate and the casting plate in sequence.

6. The casting mold according to claim 1, characterized in that: A first handle is installed on the end surface of the first clamping side plate away from the casting plate, and a second handle matching with the first handle is installed on the end surface of the second clamping side plate away from the casting plate.

7. A casting device for preparing a tensile specimen, characterized in that: It comprises a pouring funnel and the pouring mold described in any one of claims 1 to 6, wherein the discharge port of the pouring funnel matches the pouring port of the pouring mold.

8. A method for preparing a tensile specimen, characterized in that: The method uses the casting mold according to any one of claims 1 to 6 for casting, and comprises the following steps: The pouring liquid is poured into the pouring cavity connected with the pouring gate through the pouring gate, and the pouring liquid enters other pouring cavities through the connecting runner.

9. The preparation method according to claim 8, characterized in that: The pouring liquid is obtained by vacuum melting of tin-based solder.

10. The preparation method according to claim 8, characterized in that: The pouring liquid is poured into the pouring funnel by a 90-degree rotation method, and then enters the pouring cavity through the pouring port.

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