Anti-fracture device

Abstract

An anti-fracture device is applied to a 3D printing sand mold and comprises a base and a supporting piece, the base is matched with the sand mold, and a cavity for containing the supporting piece is formed in the portion, prone to fracture, of the sand mold; one end of the supporting piece is fixed to the base in a matched mode, and the other end of the supporting piece is arranged in the cavity in a penetrating mode and fixed relative to the cavity. The through hole is formed in the easy-to-break part, the supporting piece is embedded into the cavity of the easy-to-break part, the easy-to-break part is supported, and the easy-to-break part can be prevented from being broken and damaged in the sand cleaning process or the carrying process.

Description

Technical Field

[0001] The utility model relates to a 3D printed sand mold, in particular to a local anti-fracture device for a 3D printed sand mold. Background Art

[0002] A 3D printed sand mold is that the printer sprays the binder in the nozzle onto the sand powder surface of the printing platform layer by layer according to the thin slice information generated by the slicing software, by controlling the position and spraying speed of the nozzle, to produce a 3D entity. During the printing process, 3D printing is not restricted by shape, and the more complex the structure of the product, the more suitable it is for production by 3D printing.

[0003] Since the 3D printed sand mold can be printed into sand molds of any shape, during the sand cleaning process, some independent structures, cantilever structures, and sand molds with weak structures are prone to fracture. In actual production, sometimes sand molds weighing hundreds of kilograms or even more than one ton are scrapped due to fractures at local positions, greatly increasing the production cost. Summary of the Invention

[0004] Based on this, an anti-fracture device proposed by the present invention can effectively solve the problem that the entire 3D printed sand mold is scrapped due to local fractures, improve the utilization rate of the sand mold, and reduce costs.

[0005] An anti-fracture device is applied to a 3D printed sand mold and includes a base and a support member. The base cooperates with the sand mold, and a cavity for accommodating the support member is provided at the easily fractured part of the sand mold; one end of the support member is fixedly cooperated with the base, and the other end passes through the cavity and is relatively fixed to the cavity.

[0006] By providing a through hole at the easily fractured part and embedding the support member into the cavity at the easily fractured part, the support member plays a supporting role for the easily fractured part, and can prevent the easily fractured part from breaking and being damaged during the sand cleaning process or the handling process.

[0007] In one embodiment, the end of the support member away from the base is not higher than the outer surface of the easily fractured part of the sand mold.

[0008] The support member not being higher than the outer surface of the easily fractured part will not affect the external dimensions and structure of the sand mold, and can effectively avoid dimensional problems in subsequent core assembly, pouring, etc.

[0009] In one embodiment, a groove matching the cavity is provided on the outermost surface of the easily fractured part, and the cross-sectional area of the groove is larger than the cross-sectional area of the cavity.

[0010] Providing a groove above the cavity is convenient for the installation of the support member on the one hand, and can be used as an installation platform and space for other structures on the other hand.

[0011] In one embodiment, the anti-fracture device further includes a locking member, which is placed in the groove and tightly cooperates with the support member.

[0012] By the cooperation of the locking member and the support member, the support member can be fixed in the cavity of the anti-fracture part, which can play a better supporting role for the anti-fracture part.

[0013] In one embodiment, the support member is a support rod or a support plate with threads at least at one end.

[0014] In one embodiment, the support member is a threaded rod.

[0015] The support member is provided with threads, and the support member can be installed on the sand mold by screwing, which is convenient and fast to install and has a simple structure.

[0016] In one embodiment, the sand mold is provided with a groove matching the base, and the cross-sectional area of the groove is larger than the cross-sectional area of the cavity.

[0017] When the cross-section of the groove is larger than the cross-section of the cavity, the base can be used as both a positioning seat and a fixing seat, which can effectively simplify the structure and facilitate installation.

[0018] In one embodiment, the base and the support member are of an integrally formed structure.

[0019] Designing the base and the support member as a whole is convenient for installation and disassembly on the one hand, and the overall structure is not easy to loosen on the other hand, with a simplified structure and reliable stability.

[0020] In one embodiment, the ratio of the cross-sectional area of the easily fractured part to the cross-sectional area of the cavity is 2.5 - 4.

[0021] In one embodiment, multiple anti-fracture devices can be provided.

[0022] Multiple anti-fracture devices can be designed according to the structure and size of the easily fractured part of the sand mold for support, protecting the sand mold to the greatest extent.

[0023] In one embodiment, the anti-fracture device can support at least one sand mold.

[0024] According to the structure and size of the sand mold, one anti-fracture device can be used to connect the easily fractured parts of multiple sand molds, reducing the number of devices used and improving efficiency.

[0025] An anti-fracture device, by arranging a support device at the weak position of the sand mold, improves the strength of the easily fractured position, largely prevents the problem of the whole sand mold being scrapped due to the fracture of a local sand mold, saves costs and improves the yield of the sand mold at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of a sand mold;

[0027] Figure 2 is a schematic cross - sectional view of the sand mold after setting the anti - fracture device;

[0028] Figure 3 is a partially enlarged schematic diagram of the anti - fracture device;

[0029] In the attached drawings:

[0030] 10 - sand mold, 101 - through - hole, 102 - first groove, 103 - second groove;

[0031] 20 - base,

[0032] 30 - support member,

[0033] 40 - fastener,

[0034] 50 - core bonding. Detailed implementation manners

[0035] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant attached drawings. The preferred embodiments of the present invention are given in the attached drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention understood more thoroughly and comprehensively.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] In one embodiment, an anti-fracture device is applied to a 3D printed sand mold and includes a base and a support member. The base cooperates with the sand mold, and a cavity for accommodating the support member is provided at a vulnerable fracture part of the sand mold. One end of the support member is fixedly cooperated with the base, and the other end passes through the cavity and is relatively fixed to the cavity.

[0039] By providing a through hole at the vulnerable fracture part and embedding the support member into the cavity of the vulnerable fracture part, the support member plays a supporting role for the vulnerable fracture part, and can prevent the vulnerable fracture part from breaking and being damaged during the sand cleaning process or the handling process.

[0040] The following describes the anti-fracture device in combination with specific embodiments to further understand the concept of the anti-fracture device. Please refer to Figure 1 , an anti-fracture device is provided in a 3D printed sand mold 10. As Figure 2 shown, the vertical columnar protrusion has a long length and a small connection surface with the sand mold body, and is prone to fracture during processes such as sand cleaning, handling, and subsequent pouring. In order to prevent fracture and damage of similar parts, an anti-fracture device is provided at this part. Specifically, the anti-fracture device includes a base 20 and a support member 30. A cavity for accommodating the support member 30 is provided at the vulnerable fracture part, that is, a through hole 101 that can pass through the support member 30 is opened at the vulnerable fracture part. A first groove 102 that cooperates with the base 20 is provided on the sand mold 10, and the positions of the first groove and the through hole correspond. It should be noted that the through hole and the first groove are reserved in advance during the printing of the sand mold. One end of the support member 30 is fixedly connected to the base 20, and the other end passes through the through hole, playing a supporting and strengthening role for the vulnerable fracture part.

[0041] In this solution, by providing a through hole at the vulnerable fracture part of the sand mold, not only can the support member be passed through, but also the through hole is convenient for sand cleaning, and is more conducive to the installation of the support member without damaging the sand mold. In order to ensure the stability and firmness of the support member in the through hole, sand can be filled in the gap after the installation of the support member and the through hole, so that the support member is relatively fixed to the sand mold, and the supporting effect is better.

[0042] It should be noted that the cross-sectional area of the first groove is larger than the cross-sectional area of the cavity. In this way, the base can be used as both a positioning seat and a fixing seat, which can effectively simplify the structure and facilitate installation.

[0043] In one embodiment, after the support member and the base are installed, the end of the support member away from the base is not higher than the outer surface of the vulnerable fracture part of the sand mold, that is, the support member 30 is wrapped by the sand mold at the vulnerable fracture part.

[0044] The support member is not higher than the outer surface of the vulnerable fracture part, so it will not affect the external dimensions and structure of the sand mold, and can effectively avoid dimensional problems in subsequent core assembly, pouring, etc.

[0045] In one embodiment, refer to the attachedFigure 3 As shown, a second groove 103 matching the through hole 101 is provided on the outermost surface of the easily breakable part, and the cross-sectional area of the second groove is larger than that of the through hole.

[0046] A groove is provided in the upper part of the cavity. On the one hand, it is convenient for the installation of the support member, and on the other hand, it can be used as an installation platform and space for other structures. Specifically, sand can be filled in the second groove or a sealing member can be provided to fix the support member, making the installation of the anti-fracture device more reliable and the support effect better.

[0047] In an embodiment, the anti-fracture device further includes a locking member 40, which is placed in the second groove 102 and is tightly fitted with the support member 30. Specifically, the locking member 40 can be screwed, clamped, riveted, glued, inserted, welded, etc. with the support member. The specific structure is not elaborated in this embodiment, and any structure that can achieve fixed connection with the support member is acceptable.

[0048] By the cooperation of the locking member and the support member, the support member can be fixed in the cavity of the anti-fracture part, and a better supporting effect can be achieved on the anti-fracture part.

[0049] In an embodiment, the support member 30 is a support rod or support plate with threads at least at one end. Specifically, the support member 30 is a connecting rod or connecting plate with threads at one end. The threaded end is screwed with the locking member, and the other end can be riveted, glued, welded, inserted, etc. with the support seat. Conversely, if the threaded end of the support member is screwed with the support seat, the other end can be riveted, glued, welded, inserted, etc. with the locking member. The support member 30 can also be a rod or plate with threads at both ends, and both ends are connected and fixed by screwing. The connection method in this embodiment is not only convenient and reliable for installation, but also has a large selection range and many application scenarios.

[0050] In an embodiment, the base and the support member are of an integrally formed structure. For example, a bolt, at this time the bolt is passed through the through hole 101, serving as both a fixed seat and a support member. It is not only convenient for installation and disassembly, but also the overall structure is not easy to loosen, and the structure is simplified, reliable and stable.

[0051] It should be noted that after the bolt or the support member is installed, there is extra space in the first groove. In order not to affect the subsequent work, a core stick 50 can be set and bonded to the sand mold with glue. In this way, the shape and size of the entire sand mold do not change at all, and it will not affect the size and shape of the subsequent castings.

[0052] In an embodiment, if the anti-fracture part is flat or has a large size, multiple anti-fracture devices can be arranged at intervals on the anti-fracture part to protect the sand mold to the greatest extent.

[0053] In one embodiment, in order to ensure the stable and reliable installation of the anti-fracture device at the easily fractured part, the cross-sectional dimension ratio of the easily fractured part to the cross-section of the cavity is 2.5 to 4. For example, if the easily fractured part is columnar with an outer diameter of 20 cm, the diameter of the opened cavity (round hole) can be 8 cm; if the outer diameter of the easily fractured part is 80 cm, the diameter of the opened cavity (round hole) can be 20 cm. With this setting, not only can the strength of the easily fractured part be ensured, but also an effective supporting effect can be achieved.

[0054] In one embodiment, when multiple sand molds are stacked and cleaned of sand, the anti-fracture device can be connected in series to the easily fractured parts of multiple sand molds, reducing the number of devices used and improving the efficiency of installation and disassembly.

[0055] It should be noted that in the above embodiments, the cross-sectional shapes of the base and the support member can be triangular, square, circular, polygonal, etc., and the cross-sectional shapes of the base and the support member can be the same or different.

[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0057] The above-described embodiments merely represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An anti-fracture device, used in 3D printing sand molds, characterized in that: It comprises a base and a support member, wherein the base cooperates with the sand mold, and a cavity for accommodating the support member is provided at a part of the sand mold that is easy to break; one end of the support member is installed in cooperation with the base, and the other end is penetrated in the cavity and fixed relatively to the sand mold.

2. The anti-fracture device according to claim 1, characterized in that: One end of the support member away from the base is not higher than the outer surface of the easily broken part of the sand mold.

3. The anti-fracture device according to claim 1, characterized in that: A groove matching the cavity is arranged on the outermost surface of the easily-fragile portion, and the cross-sectional area of ​​the groove is larger than the cross-sectional area of ​​the cavity.

4. The anti-fracture device according to claim 3, characterized in that: The anti-fracture device also includes a locking member, which is placed in the groove and tightly matched with the supporting member.

5. The anti-fracture device according to claim 4, characterized in that: The support member is a support rod or a support plate with at least one end provided with a thread.

6. The anti-fracture device according to claim 1, characterized in that: The sand mold is provided with a groove matching the base, and the cross-sectional area of ​​the groove is larger than the cross-sectional area of ​​the cavity.

7. The anti-fracture device according to claim 1, characterized in that: The base and the support member are an integrally formed structure.

8. The anti-fracture device according to claim 1, characterized in that: The anti-fracture device may be provided in plurality.

9. The anti-fracture device according to claim 1, characterized in that: The ratio of the cross section of the easily breakable portion to the cross section of the cavity is 2.5-4.

10. The anti-fracture device according to claim 1, characterized in that: The anti-fracture device may support at least one sand mold.

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