3D printing sand mold anti-gravity casting forming device

Abstract

The utility model discloses a 3D printing sand mold anti-gravity casting forming device. The device comprises a pouring connector tool used for containing a 3D printing sand mold; the middle partition plate is used for containing the pouring connector tool and fixedly connected with the 3D printing sand mold; the top box cover plate is used for sealing the top end of the 3D printing sand mold; the top of the liquid rising pipe is placed on the middle partition plate; and a liquid rising runner of the liquid rising pipe communicates with a sprue gate in the bottom end of the 3D printing sand mold and is used for enabling molten metal to flow into an inner cavity of the 3D printing sand mold from the liquid rising pipe and then to be solidified and formed. According to the utility model, the pouring interface tool is arranged, so that the supporting strength of the 3D printing sand mold is improved; the asbestos cord and the asbestos cloth are designed for sealing, so that the interface sealing is improved; the pouring connector tool can be repeatedly used, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a 3D printing sand mold anti-gravity casting forming device. Background Art

[0002] 3D printing is a type of rapid prototyping technology that uses powdered metal or coated sand and other bondable materials to construct or cast parts through layer-by-layer multi-layer printing. In order to meet the requirements of the high-paced single product and small batch product market, as well as the increasing complexity of military products, the traditional casting mold design and production cycle cannot meet the characteristics of short product delivery cycle and long product production process. We use 3D printing coated sand technology to make sand molds instead of mold production without mold making.

[0003] Traditional sand mold low and differential pressure casting has a high-strength outer box, which supports the internal sand mold. At the same time, the outer box is a combination of the steel skeleton structure and the inherent strength of the sand mold, which realizes the risk-free docking of the 3D printed sand mold pouring port and the liquid riser nozzle. But at the same time, this process method has shortcomings, mainly the following points:

[0004] (1) The outer box has been used for a long time and will be deformed after being opened and knocked, which will cause production, processing and maintenance costs;

[0005] (2) A large amount of molding sand will be used in the production of the outer box, which will reduce production efficiency;

[0006] (3) The increase in the amount of molding sand leads to an increase in the consumption of other auxiliary raw materials;

[0007] (4) Due to the low strength of the 3D printed sand mold and the sealing step at the interface, the sand mold outer box is prone to cracking.

[0008] Currently, no effective solution has been proposed to the problems in the prior art of low strength of 3D printed sand molds, easy cracking of the sand mold outer box due to the sealing steps at the interface, and the use of a large amount of molding sand in the production of the outer box. Utility Model Content

[0009] The utility model provides a 3D printed sand mold anti-gravity casting molding device in the embodiment to solve the problems in the prior art of low strength of the 3D printed sand mold, easy cracking of the sand mold outer box caused by the sealing step at the interface, and the use of a large amount of molding sand in the production of the outer box.

[0010] To achieve the above-mentioned purpose, the utility model provides a 3D printed sand mold anti-gravity casting molding device, which includes: a pouring interface tooling for holding the 3D printed sand mold; a middle partition plate for holding the pouring interface tooling and fixedly connected to the 3D printed sand mold; a top box cover plate for sealing the top of the 3D printed sand mold; a riser pipe, the top of which is placed on the middle partition plate; the riser runner of the riser pipe is connected to the pouring port at the bottom end of the 3D printed sand mold, so as to allow the molten metal to flow from the riser pipe into the inner cavity of the 3D printed sand mold and then solidify and mold.

[0011] Optionally, the riser tube is two inverted L-shaped structures facing each other, and the middle part of the riser tube is a through riser runner.

[0012] Optionally, the pouring interface tooling includes two symmetrical semicircular structures; the two symmetrical semicircular structures are fixedly connected to form a circular structure; a first liquid lifting pouring hole is provided at the center of the pouring interface tooling; and the 3D printing sand mold is placed along the inner surface of the first liquid lifting pouring hole.

[0013] Optionally, a second liquid lifting pouring hole is provided at the center of the middle partition; and the liquid lifting tube is placed along the inner surface of the second liquid lifting pouring hole.

[0014] Optionally, a filter screen is provided at the top of the riser tube.

[0015] Optionally, the top end of the riser pipe and the bottom end of the pouring port are sealed by an asbestos rope.

[0016] Optionally, the top end of the riser pipe and the annular sealing groove at the bottom end of the pouring interface tooling are sealed by asbestos cloth.

[0017] Optionally, a fixed groove is provided on the top of the casting interface tooling for holding the 3D printing sand mold.

[0018] Optionally, it also includes: a fastening screw; the fastening screw is used to sequentially penetrate the top box cover, the 3D printed sand mold, the pouring interface tooling, and the middle partition, and fix the 3D printed sand mold to the middle partition through a first fastening nut.

[0019] Optionally, the two symmetrical semicircular structures are fixedly connected by a fastening screw and a second fastening nut.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a 3D printed sand mold anti-gravity casting molding device, which includes: a pouring interface tooling for holding the 3D printed sand mold; a middle partition for holding the pouring interface tooling and fixedly connected to the 3D printed sand mold; a top box cover for sealing the top of the 3D printed sand mold; a riser pipe, the top of which is placed on the middle partition; the riser runner of the riser pipe is connected to the pouring port at the bottom of the 3D printed sand mold, so as to allow the molten metal to flow from the riser pipe into the inner cavity of the 3D printed sand mold and then solidify and mold. The utility model improves the support strength of the 3D printed sand mold by setting a pouring interface tooling; improves the interface sealing by designing asbestos rope and asbestos cloth sealing; the pouring interface tooling can be reused to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a 3D printing sand mold anti-gravity casting molding device provided by an embodiment of the utility model;

[0023] Figure 2 It is a front view of the pouring interface tooling provided by the embodiment of the utility model;

[0024] Figure 3 It is a top view of the pouring interface tooling provided by the embodiment of the utility model;

[0025] Figure 4 It is an enlarged view of the pouring interface tooling, 3D printing sand mold and riser pipe sealing structure provided in the embodiment of the utility model.

[0026] Explanation of symbols:

[0027] Pouring interface tooling-1, middle partition-2, top box cover-3, liquid rising pipe-4, 3D printing sand mold-5, first liquid rising pouring hole-6, second liquid rising pouring hole-7, filter screen-8, asbestos rope-9, asbestos cloth-10, fixing groove-11, annular sealing groove-12, fastening screw-13, first fastening nut-14, fastening screw-15, second fastening nut-16. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. 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.

[0029] Traditional sand mold low and differential pressure casting has a high-strength outer box, which supports the internal sand mold. At the same time, the outer box is a combination of the steel skeleton structure and the inherent strength of the sand mold, which realizes the risk-free docking of the 3D printed sand mold pouring port and the liquid riser nozzle. But at the same time, this process method has shortcomings, mainly the following points:

[0030] (1) The outer box has been used for a long time and will be deformed after being opened and knocked, which will cause production, processing and maintenance costs;

[0031] (2) A large amount of molding sand will be used in the production of the outer box, which will reduce production efficiency;

[0032] (3) The increase in the amount of molding sand leads to an increase in the consumption of other auxiliary raw materials.

[0033] (4) Due to the low strength of the 3D printed sand mold and the sealing step at the interface, the sand mold outer box is prone to cracking.

[0034] Therefore, the utility model provides a 3D printing sand mold anti-gravity casting molding device. It mainly designs the pouring interface tooling to improve the interface sand mold support strength and interface sealing docking. Among them, anti-gravity is a low-pressure, differential pressure pouring method, and the metal liquid flows from bottom to top under the action of air pressure and finally fills the mold cavity.

[0035] Figure 1 3D printing sand mold anti-gravity casting molding device provided by the embodiment of the utility model is shown in FIG. Figure 1 As shown, the device comprises:

[0036] 1. Casting interface tooling, used to hold 3D printed sand molds;

[0037] Figure 2 It is a front view of the pouring interface tooling provided by the embodiment of the utility model; Figure 3 is a top view of the pouring interface tooling provided by the embodiment of the utility model; Figure 2 and Figure 3 As shown,

[0038] Specifically, a fixed groove is provided on the top of the casting interface tooling for containing the 3D printing sand mold.

[0039] The pouring interface tooling includes two symmetrical semicircular structures; the two symmetrical semicircular structures are fixedly connected to form a circular structure; specifically, the two symmetrical semicircular structures are fixedly connected by a fastening screw and a second fastening nut, and a plurality of the fastening screws and the second fastening nuts are provided correspondingly. The design of the two symmetrical semicircular structures is mainly to prevent the presence of solidified metal at the gate position after pouring and the risk of the gate being wrapped by the tooling after solidification and unable to be removed. This two-part design facilitates the removal of the solidified metal after the tooling is opened.

[0040] A first liquid-raising pouring hole is provided at the center of the pouring interface tooling; the 3D printing sand mold is placed along the inner surface of the first liquid-raising pouring hole. The pouring interface tooling includes two fixedly connected parts from top to bottom: a first circular ring and a second circular ring; the inner diameters of the first circular ring and the second circular ring form the first liquid-raising pouring hole; the outer diameter of the first circular ring is greater than the outer diameter of the second circular ring;

[0041] The 3D printing sand mold includes two parts fixedly connected from top to bottom: a first cylinder and a second cylinder (i.e., a pouring port); the first cylinder and the second cylinder are both hollow structures, and the first cylinder and the second cylinder are connected; the inner diameter of the first cylinder is greater than the outer diameter of the second cylinder; the bottom end of the first cylinder is located on the first ring; the outer surface of the second cylinder is in contact with the inner surfaces of the first ring and the second ring (i.e., the inner surface of the first liquid pouring hole).

[0042] The pouring interface tooling is made of stainless steel, which provides support for the pouring port of the 3D printed sand mold and prevents the 3D printed sand mold from breaking under heavy pressure conditions.

[0043] 2. A middle partition, used to hold the pouring interface tooling and fixedly connected to the 3D printed sand mold;

[0044] The middle partition is a circular plate structure, and a second liquid lifting pouring hole is arranged at the center of the middle partition; a liquid lifting pipe is placed along the inner surface of the second liquid lifting pouring hole.

[0045] 3. A top box cover, used to seal the top of the 3D printed sand mold;

[0046] The top box cover is a circular plate structure, which is used to seal the top of the 3D printing sand mold.

[0047] 4. A fastening screw, which is used to sequentially penetrate the top box cover, the 3D printed sand mold (i.e., the first cylinder), the pouring interface tooling (i.e., the first ring), and the middle partition, and fix the 3D printed sand mold to the middle partition through a first fastening nut; and ensure that the top box cover presses the 3D printed sand mold tightly.

[0048] Furthermore, the fastening screw and the first fastening nut are correspondingly provided in plurality to ensure that the 3D printed sand mold is fastened to the middle partition.

[0049] 5. A riser pipe, the top of which is placed on the middle partition; a riser runner of the riser pipe is connected to a pouring port at the bottom of the 3D printing sand mold, so as to allow the molten metal to flow from the riser pipe into the inner cavity of the 3D printing sand mold and then solidify and form.

[0050] Specifically, the liquid riser is two inverted L-shaped structures facing each other, and the middle of the liquid riser is a through liquid riser runner. The liquid riser runner of the liquid riser is connected to the pouring port of the 3D printing sand mold (i.e., the inner surface of the second cylinder);

[0051] Figure 4 It is an enlarged view of the pouring interface tooling, 3D printing sand mold and rising tube sealing structure provided by the embodiment of the utility model, such as Figure 4 As shown,

[0052] A filter screen is arranged at the top of the riser pipe to filter the molten metal.

[0053] The top end of the riser tube and the bottom end of the pouring port are sealed by asbestos rope; specifically, the filter screen at the top end of the riser tube and the bottom end of the pouring port are sealed by asbestos rope to form a first pouring seal; the top end of the riser tube and the annular sealing groove at the bottom end of the pouring interface tooling (i.e., the bottom end of the second circular ring) are sealed by asbestos cloth to form a second pouring seal, and the two seals are used to achieve smooth rising of the molten metal and filling pouring during the anti-gravity casting process.

[0054] The specific implementation process of the utility model is as follows:

[0055] (1) Preparation for pouring: The 3D printed sand mold is placed stably on the pouring interface tooling, and the top of the mold is covered with a top box cover;

[0056] (2) After the liquid riser is placed on the middle partition, the metal liquid filter screen, the sealing asbestos rope, and the sealing asbestos cloth are placed in sequence;

[0057] (3) Align the engraved lines and steadily place the pouring interface tooling with the 3D printed sand mold on the middle partition;

[0058] (4) The fastening screw is passed through the top box cover, the 3D printed sand mold, the pouring interface tooling, and the middle partition in sequence, and the assembled 3D printed sand mold is fastened to the middle partition through the first fastening nut;

[0059] (5) After locking the middle partition, casting is carried out, that is, the molten metal enters the inner cavity of the 3D printed sand mold from the riser and begins to solidify.

[0060] Beneficial effects of the utility model:

[0061] The utility model provides a 3D printed sand mold anti-gravity casting molding device, which includes: a pouring interface tooling for holding the 3D printed sand mold; a middle partition for holding the pouring interface tooling and fixedly connected to the 3D printed sand mold; a top box cover for sealing the top of the 3D printed sand mold; a riser pipe, the top of which is placed on the middle partition; the riser runner of the riser pipe is connected to the pouring port at the bottom of the 3D printed sand mold, so as to allow the molten metal to flow from the riser pipe into the inner cavity of the 3D printed sand mold and then solidify and mold. The utility model improves the support strength of the 3D printed sand mold by setting a pouring interface tooling; improves the interface sealing by designing asbestos rope and asbestos cloth sealing; the pouring interface tooling can be reused to improve production efficiency.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A 3D printing sand mold anti-gravity casting molding device, characterized in that: include: Casting interface tooling, used to hold 3D printed sand molds; A middle partition, used to hold the pouring interface tooling and fixedly connected to the 3D printed sand mold; A top box cover plate, used to seal the top of the 3D printed sand mold; A riser pipe, the top of which is placed on the middle partition; a riser runner of the riser pipe is connected to a pouring port at the bottom of the 3D printing sand mold, so as to allow the molten metal to flow from the riser pipe into the inner cavity of the 3D printing sand mold and then solidify and form.

2. The device according to claim 1, characterized in that: The liquid riser is two inverted L-shaped structures facing each other, and the middle of the liquid riser is a through liquid riser pouring channel.

3. The device according to claim 1, characterized in that: The pouring interface tooling includes two symmetrical semicircular structures; the two symmetrical semicircular structures are fixedly connected to form a circular structure; A first liquid-raising pouring hole is provided at the center of the pouring interface tooling; and the 3D printing sand mold is placed along the inner surface of the first liquid-raising pouring hole.

4. The device according to claim 1, characterized in that: A second liquid raising pouring hole is provided at the center of the middle partition plate; and the liquid raising tube is placed along the inner surface of the second liquid raising pouring hole.

5. The device according to claim 1, characterized in that: A filter screen is arranged at the top of the liquid riser.

6. The device according to claim 1, characterized in that: The top end of the liquid riser and the bottom end of the pouring port are sealed by an asbestos rope.

7. The device according to claim 1, characterized in that: The top end of the liquid riser and the annular sealing groove at the bottom end of the pouring interface tooling are sealed by asbestos cloth.

8. The device according to claim 1, characterized in that: A fixed groove is provided on the top of the pouring interface tooling for containing the 3D printing sand mold.

9. The device according to claim 1, characterized in that Also includes: Tightening screw; The fastening screw is used to penetrate the top box cover, the 3D printed sand mold, the pouring interface tooling, and the middle partition in sequence, and the 3D printed sand mold is fixedly connected to the middle partition through a first fastening nut.

10. The device according to claim 3, characterized in that: The two symmetrical semicircular structures are fixedly connected by a fastening screw and a second fastening nut.

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