Sand box combined bottom plate of hot phenolic sand mold 3D printer

Abstract

The utility model discloses a sand box combined bottom plate of a hot phenolic sand mould 3D printer, which comprises a steel bottom plate and a sand bottom plate assembly, the steel bottom plate is mounted at the bottom of a sand box main body, the sand bottom plate assembly is mounted at the upper part of the steel bottom plate, a plurality of positioning holes are formed in the steel bottom plate, and the sand bottom plate assembly is connected with the positioning holes of the steel bottom plate through a positioning structure; a gap is formed between the outer side face of the sand bottom plate assembly and the inner wall of the sand box body, after the sand bottom plate assembly and the steel bottom plate are combined, the gap is filled with sand, and the filled sand is flattened to be flush with the upper surface of the sand bottom plate assembly. According to the bottom plate, the steel bottom plate and the sand bottom plate assembly are combined, the combined bottom plate can be repeatedly used, the thickness of bottom sand laid by a printer is reduced from 35 mm to 5 mm, the working time of the printer is shortened, the printing cost is greatly reduced, and the printing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of sand boxes, and particularly relates to a sand box combined bottom plate of a thermal phenolic sand mold 3D printer. Background Art

[0002] In modern casting technology, 3D printing technology has gradually become the mainstream way to manufacture complex sand molds with its high precision and high efficiency. Among them, the thermal phenolic sand mold 3D printer, as an emerging printing equipment, is increasingly widely used in the casting industry. Compared with the traditional furan sand mold 3D printer, the thermal phenolic sand mold 3D printer has significant advantages. Its sand mold has less gas emission, good sand fluidity, and easy sand cleaning, which is especially suitable for the production of complex sand molds.

[0003] However, a key problem with hot phenolic sand molds is that they cannot be cured at room temperature. To solve this problem, the hot phenolic sand mold 3D printer is equipped with a microwave heating device, which uses microwave heating to make the sand mold reach the temperature required for curing. However, this also brings new problems. During the curing process, in order to ensure uniform heating and curing effect of the sand mold, the sand mold cannot be in direct contact with the steel base plate. After many tests and verifications, the existing process requires a 35mm thick layer of bottom sand to be laid at the initial stage of printing. This layer of bottom sand does not contain resin, and its main function is to serve as a thermal isolation layer to prevent uneven heat conduction caused by direct contact between the sand mold and the steel base plate.

[0004] Although this method of laying the bottom sand solves the problem of heat conduction to a certain extent, it also brings a series of problems. First of all, laying a 35mm thick bottom sand requires the printer to work for a long time, usually taking more than an hour, which undoubtedly increases the operating time and cost of the printer. Secondly, after the curing is completed, this part of the bottom sand will be sucked away as waste sand during the sand suction process and cannot be recycled. This means that the bottom sand needs to be re-laid for each print, which not only causes a waste of materials, but also greatly reduces the printing efficiency. Finally, considering that 3D printers are high-precision equipment, their operating costs are already high. This process of re-laying the bottom sand for each print further increases the production cost, which is not conducive to the promotion and application of this technology. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a sand box combined bottom plate of a thermal phenolic sand mold 3D printer to solve the problems of low efficiency and high cost when the existing thermal phenolic sand mold 3D printer prints sand molds.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A sand box combined bottom plate of a thermal phenolic sand mold 3D printer comprises a steel bottom plate and a sand bottom plate assembly, wherein the steel bottom plate is mounted on the bottom of a sand box body, the sand bottom plate assembly is mounted on the upper portion of the steel bottom plate, a plurality of positioning holes are arranged on the steel bottom plate, and the sand bottom plate assembly is connected to the positioning holes of the steel bottom plate through a positioning structure; a gap is arranged between the outer side surface of the sand bottom plate assembly and the inner wall of the sand box body, and after the sand bottom plate assembly is combined with the steel bottom plate, the gap is filled with sand, and the filled sand is smoothed to be flush with the upper surface of the sand bottom plate assembly.

[0008] Furthermore, the sand bottom plate assembly includes a plurality of sand bottom plate monomers, and gaps are also provided between the plurality of sand bottom plate monomers. The gaps are filled with sand, and the filled sand is smoothed until it is flush with the upper surface of the sand bottom plate assembly.

[0009] Furthermore, the thickness of the sand bottom plate is 30 mm, and the gap width is 3-6 mm.

[0010] Furthermore, the positioning structure includes positioning pins, and each of the sand base plate units is provided with two pin holes, the pin holes correspond to the positions of the positioning holes, and a positioning pin is provided in the pin hole, and the lower end of the positioning pin is inserted in the positioning hole. After the sand base plate assembly and the steel base plate assembly are combined, sand is filled in the pin hole and smoothed to seal the pin hole.

[0011] Furthermore, the positioning structure includes two positioning columns, which are integrally arranged at the lower part of the sand bottom plate unit. When the sand bottom plate assembly is combined with the steel bottom plate, the positioning columns are inserted into the positioning holes.

[0012] Furthermore, the positioning structure is arranged at the diagonal of the sand bottom plate unit.

[0013] The beneficial effects of the utility model are:

[0014] 1) The bottom plate of the utility model is a combination of a steel bottom plate and a sand bottom plate assembly. The combined bottom plate is reusable, and the thickness of the printer bottom sand is reduced from 35mm to 5mm, which reduces the working time of the printer, greatly reduces the printing cost, and improves the printing efficiency.

[0015] 2) Since the entire sand bottom plate assembly is heavy, the sand bottom plate assembly of this solution adopts a method of splicing multiple sand bottom plate monomers, which is conducive to the assembly of the sand bottom plate assembly and the steel bottom plate.

[0016] 3) A pin hole corresponding to the position of the positioning hole is opened at the diagonal position of the sand bottom plate unit, and the sand bottom plate unit and the steel bottom plate are positioned and fixed using the positioning pin, so that it is easy to observe from above whether the pin hole and the positioning hole are aligned, thereby facilitating the rapid assembly of the combined bottom plate.

[0017] 4) By setting a positioning column at the bottom of the sand bottom plate unit, the positioning column is used to position and combine the sand bottom plate unit and the steel bottom plate, so that there is no opening on the upper part of the sand bottom plate unit, and there is no need to fill the pin holes with sand, thereby ensuring the smoothness of the upper surface of the sand bottom plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 The utility model is a schematic diagram of a sand box combined bottom plate structure of a thermal phenolic sand mold 3D printer.

[0019] Attached Figure 2 It is a schematic diagram of embodiment 1 of the positioning structure in the sand box combined bottom plate of a thermal phenolic sand mold 3D printer of the utility model.

[0020] Attached Figure 3 It is a schematic diagram of embodiment 2 of the positioning structure in the sand box combined bottom plate of a thermal phenolic sand mold 3D printer of the utility model.

[0021] In the figure, 1. sand box body; 2. steel bottom plate; 3. sand bottom plate assembly; 4. gap; 5. positioning hole; 6. positioning pin; 7. pin hole; 8. positioning column. DETAILED DESCRIPTION

[0022] The following will be combined with the attached Figure 1-Figure 3 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to 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.

[0024] like Figure 1 As shown, a sand box combined bottom plate of a thermal phenolic sand mold 3D printer includes a steel bottom plate 2 and a sand bottom plate assembly 3, wherein the steel bottom plate 2 is mounted on the bottom of the sand box body 1, and the sand bottom plate assembly 3 is mounted on the upper part of the steel bottom plate 2. Figure 2As shown, the steel bottom plate 2 is provided with a plurality of positioning holes 5, and the sand bottom plate assembly 3 is connected to the positioning holes 5 of the steel bottom plate 2 through a positioning structure; a gap 4 is provided between the outer side surface of the sand bottom plate assembly and the inner wall of the sand box body 1, and after the sand bottom plate assembly is combined with the steel bottom plate 2, the gap 4 is filled with sand, and the filled sand is smoothed to be flush with the upper surface of the sand bottom plate assembly.

[0025] like Figure 1 As shown, the sand bottom plate assembly 3 includes a plurality of sand bottom plate monomers, and gaps 4 are also provided between the plurality of sand bottom plate monomers. The gaps 4 are filled with sand, and the filled sand is smoothed to be flush with the upper surface of the sand bottom plate assembly. The sand bottom plate assembly 3 is designed as a combination of multiple monomers, which reduces the difficulty of installing the sand bottom plate assembly 3.

[0026] Furthermore, the thickness of the sand bottom plate is 30 mm, and the width of the gap 4 is 3-6 mm. In this embodiment, the width of the gap 4 is 5 mm.

[0027] like Figure 2 As shown, the positioning structure includes a positioning pin 6, and each of the sand bottom plate monomers is provided with two pin holes 7, the pin holes 7 correspond to the positions of the positioning holes 5, and the pin holes 7 are provided with positioning pins 6, and the lower ends of the positioning pins 6 are inserted into the positioning holes 5. After the sand bottom plate assembly 3 and the steel bottom plate 2 assembly are combined, sand is filled in the pin holes 7 and smoothed to seal the pin holes 7; this type of positioning structure is used to quickly determine the position of the sand bottom plate assembly 3 when the sand bottom plate monomer is combined with the steel bottom plate 2.

[0028] like Figure 3 As shown, the positioning structure includes two positioning columns 8, and the positioning columns 8 are integrally arranged at the lower part of the sand bottom plate unit. When the sand bottom plate assembly 3 is combined with the steel bottom plate 2, the positioning columns 8 are inserted into the positioning holes 5. With this type of positioning structure, there are no openings on the upper part of the sand bottom plate unit, thereby ensuring the smoothness of the upper surface of the sand bottom plate assembly 3.

[0029] like Figure 1-Figure 3 As shown, the positioning structure is arranged at the diagonal of the sand bottom plate unit.

[0030] According to the size of the sand box of the hot phenolic sand mold 3D printer, the size and combination method of the combined bottom plate are designed. The combined bottom plate is divided into a lower steel bottom plate 2 and an upper sand bottom plate assembly 3. The steel bottom plate 2 is consistent with the inner contour size of the sand box and is designed as one piece; the sand bottom plate assembly 3 is 30mm high and is designed into 4 sand bottom plate monomers. Furan resin and curing agent are used to cure and mold the sand bottom plate monomers. In this embodiment, the gap between the sand bottom plate assembly 3 and the sand box wall is 5mm, and the gap between the four sand bottom plate monomers is also 5mm; the reserved 5mm gap The gap 4 is filled with sand and smoothed after filling. The steel base plate 2 and the sand base plate assembly 3 are connected by a positioning structure. When in use, the thermal phenolic sand mold 3D printer only needs to lay 5mm bottom sand on the upper part of the sand base plate assembly 3 to level the base plate surface. Compared with the traditional operation of laying 35mm bottom sand, the working time of the printer is greatly reduced, the printing cost is reduced, and the printing efficiency is improved. After the sand mold is printed, microwave curing is carried out, and after curing, the loose sand is absorbed to take out the required sand mold; the sand base plate assembly 3 is retained in the sand box and can be reused.

[0031] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A sand box combined bottom plate of a thermal phenolic sand mold 3D printer, comprising a steel bottom plate and a sand bottom plate assembly, wherein the steel bottom plate is installed at the bottom of the sand box body, characterized in that: The sand bottom plate assembly is installed on the upper part of the steel bottom plate. The steel bottom plate is provided with a plurality of positioning holes. The sand bottom plate assembly is connected to the positioning holes of the steel bottom plate through a positioning structure. A gap is provided between the outer side surface of the sand bottom plate assembly and the inner wall of the sand box body. After the sand bottom plate assembly is combined with the steel bottom plate, the gap is filled with sand, and the filled sand is smoothed until it is flush with the upper surface of the sand bottom plate assembly.

2. The sand box assembly bottom plate of a thermal phenolic sand mold 3D printer according to claim 1, characterized in that: The sand bottom plate assembly comprises a plurality of sand bottom plate monomers, and gaps are also arranged between the plurality of sand bottom plate monomers. The gaps are filled with sand, and the filled sand is smoothed to be flush with the upper surface of the sand bottom plate assembly.

3. The sand box assembly bottom plate of a thermal phenolic sand mold 3D printer according to claim 2, characterized in that: The thickness of the sand bottom plate is 30 mm, and the width of the gap is 3-6 mm.

4. The sand box assembly bottom plate of a thermal phenolic sand mold 3D printer according to claim 2, characterized in that: The positioning structure includes positioning pins. Each of the sand base plate units is provided with two pin holes, which correspond to the positions of the positioning holes. Positioning pins are provided in the pin holes, and the lower ends of the positioning pins are inserted into the positioning holes. After the sand base plate assembly and the steel base plate assembly are combined, sand is filled in the pin holes and smoothed to seal the pin holes.

5. The sand box assembly bottom plate of a thermal phenolic sand mold 3D printer according to claim 2, characterized in that: The positioning structure comprises two positioning columns, which are integrally arranged at the lower part of the sand bottom plate unit. When the sand bottom plate assembly is combined with the steel bottom plate, the positioning columns are inserted into the positioning holes.

6. A sand box assembly bottom plate for a thermal phenolic sand mold 3D printer according to claim 4 or 5, characterized in that: The positioning structure is arranged at the diagonal of the sand bottom plate unit.

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