A square cavity casting mold

Abstract

The present application belongs to the technical field of casting mold, and particularly relates to a square cavity casting mold. The square cavity casting mold comprises a mold body and supporting legs for supporting the mold body. The mold body comprises horizontally and intervally arranged first and second vertical mold plates. An outer mold cylinder and an inner mold cylinder are assembled between the first and second vertical mold plates. The first and second vertical mold plates, the outer mold cylinder and the inner mold cylinder cooperatively form an annular cavity. The first and second vertical mold plates are square in structure. The first and second vertical mold plates are fixed on the supporting legs in a manner that two opposite top vertices of the first and second vertical mold plates are vertically arranged and the connecting line is perpendicular to the horizontal plane. At least one of the first and second vertical mold plates is provided with a protrusion for forming a sealing groove. At least one of the first and second vertical mold plates is assembled with a threaded part for fixing a metal threaded insert. The top of the mold body is provided with a mold gate at the top vertex of the uppermost end. The mold gate is communicated with the cavity. The present application solves the problems of air holes and uneven bottom of the sealing groove caused by the existing casting method.

Description

Technical Field

[0001] This invention belongs to the field of casting mold technology, and specifically relates to a square cavity casting mold. Background Technology

[0002] Large-scale nuclear industrial applications typically use Figure 1 The square cavity 1 shown is a cast-molded workpiece that serves as insulation and sealing. The square cavity 1 is cylindrical in shape and made of epoxy resin. Multiple threaded metal inserts 11 are evenly distributed around the upper and lower end faces of the cylinder along its extension direction, connecting the structural components at both ends. To ensure a tight seal during connection, T-shaped sealing grooves 12 are provided on the upper and lower end faces of the cylinder for installing sealing rings.

[0003] In existing technologies, the structure of the molding die for casting the aforementioned workpieces varies depending on the structure of the workpiece, but the casting method is mostly vertical or horizontal casting. A vertical casting die includes a mold body, which comprises a horizontally arranged upper mold plate and a lower mold plate. An inner mold cylinder and an outer mold cylinder are fixed between the upper and lower mold plates. The upper and lower mold plates, along with the inner and outer mold cylinders, form an annular cavity, with a gate located at one corner of the cavity. The difference between horizontal and vertical casting lies only in that the side of the outer mold cylinder is used as the bottom surface, and the mold gate is still located at the top of the mold body and communicates with the cavity.

[0004] The problems with these two existing casting methods are as follows: In vertical and horizontal casting, liquid epoxy resin enters the cavity from the gate. Since the cavity is not in a true vacuum during actual casting, it becomes filled with gas. Furthermore, due to the large top surface area and the high viscosity of the liquid epoxy resin, when the cavity is almost full, gas in areas far from the gate on the end face of the molded workpiece cannot escape in time. Therefore, after the epoxy resin solidifies, pores will appear on the end face. Secondly, in vertical casting, before the epoxy resin solidifies, because it is a mixture, it will settle under gravity, causing unevenness at the bottom of the sealing groove and reducing the sealing effect. Summary of the Invention

[0005] The purpose of this invention is to provide a square cavity casting mold to solve the problems of air holes and uneven bottom of the sealing groove that are easily generated in existing casting methods.

[0006] To achieve the above objectives, the technical solution of the square cavity casting mold provided by the present invention is as follows: it includes a mold body and support legs for supporting the mold body. The mold body includes a first vertical template and a second vertical template arranged horizontally at intervals. An outer mold cylinder and an inner mold cylinder are assembled between the first vertical template and the second vertical template. The first vertical template, the second vertical template, the outer mold cylinder, and the inner mold cylinder cooperate to form an annular cavity. The first vertical template and the second vertical template are both square structures, and the first vertical template and the second vertical template are both fixed to the support legs with two of their vertices facing each other vertically and the line connecting them being perpendicular to the horizontal plane. At least one of the first vertical template and the second vertical template is provided with a protrusion for forming a sealing groove. At least one of the first vertical template and the second vertical template is equipped with a threaded part for fixing a metal threaded insert. The top of the mold body is provided with a mold gate located at the uppermost vertices, and the mold gate communicates with the cavity.

[0007] Beneficial effects: Both the first and second mold plates are arranged with two vertices facing each other vertically, and the line connecting them is perpendicular to the horizontal plane, placing the mold gate at the top vertex. The inner walls of the cavity are all inclined surfaces, allowing the liquid epoxy resin to gradually fill the cavity from bottom to top under its own weight during pouring. This flow facilitates upward gas discharge and reduces the likelihood of air pockets forming in the molded workpiece. During epoxy resin cooling, even if the metal threaded insert cools and shrinks, the epoxy resin can still flow to the shrinkage area under its own weight, preventing separation from the metal threaded insert. Because the protrusions and epoxy resin are no longer arranged vertically during pouring and cooling, even if epoxy resin material settles, it will not separate from the protrusions, avoiding unevenness at the bottom of the sealing groove.

[0008] Furthermore, in the direction of the interval arrangement of the first and second vertical templates, the mold gate is offset at the first vertical template, and an venting and shrinkage compensation groove is provided on the inner wall of the outer mold cylinder at the intersection of the gate and the cavity. The venting and shrinkage compensation groove extends from the gate to the second vertical template and is arranged inclined toward the inner mold cylinder.

[0009] Beneficial effects: When the liquid epoxy resin is about to fill the mold cavity, the inclined venting and feeding groove facilitates the discharge of gas inside the liquid epoxy resin. As the epoxy resin cools, its volume shrinks, and at this time, the liquid epoxy resin in the venting and feeding groove can flow into the gaps of the shrinkage part and fill the gaps; the inclined arrangement of the venting and feeding groove facilitates the gradual discharge of gas from the upward slope.

[0010] Furthermore, the exhaust gas filling groove extends to the second upright template.

[0011] Beneficial effects: The venting and shrinkage groove extends to the second vertical template, which is conducive to the discharge of gas in the dead corner formed by the second vertical template and the outer mold cylinder, and avoids the formation of air holes due to the inability of gas to be discharged.

[0012] Furthermore, the venting and feeding groove is formed on both the gate and the outer mold cylinder.

[0013] Beneficial effects: The venting and shrinkage compensation groove is formed on both the gate and the outer mold cylinder. The venting and shrinkage compensation groove has a large volume, which further improves the speed of gas discharge.

[0014] Furthermore, the angle between the exhaust gas filling groove and the horizontal plane is 15° to 45°.

[0015] Furthermore, one of the first and second templates is pre-set as the first part with the outer mold cylinder via a threaded component, and the other is pre-set as the second part with the inner mold cylinder via a threaded component. The first part and the second part are assembled to form the mold body.

[0016] Beneficial effects: By pre-setting the first and second parts, it is easier to close and open the mold.

[0017] Furthermore, one of the first and second upright templates is provided with a mold closing guide post, and the other is provided with a positioning hole corresponding to the mold closing guide post. The guide post is used to be inserted into the positioning hole before the first part and the second part are aligned.

[0018] Beneficial effect: The mold closing guide post and positioning hole are positioned before they are fully aligned, preventing misalignment during the alignment of the first and second parts, which could then cause them to collide with the threaded parts.

[0019] Furthermore, at least one of the first and second upright templates is provided with a support plate, which is used to support the inner mold cylinder.

[0020] Beneficial effect: By setting up a support plate, the overall strength of the inner mold cylinder can be increased.

[0021] Furthermore, the outer mold cylinder has flanges on both sides, and the mold body includes flanges that penetrate the outer mold cylinder and through grooves on the first or second upright template on the corresponding side. The mold body also includes bolt and nut assemblies located through the through grooves to connect the outer mold cylinder with the first or second upright template.

[0022] Beneficial effects: The slots are used to install bolts, so that the first and second templates are fixedly connected. Since the mold needs to be opened and closed frequently, the connection part is designed as a slot rather than a hole, which facilitates the removal and removal of the bolt and nut assembly.

[0023] Furthermore, support columns are installed on the first and second upright templates, which are used to support the first and second upright templates on the ground when they are laid flat.

[0024] Beneficial effects: The support columns can support the first and second formwork at a certain height, preventing the problem of the first and second formwork being difficult to remove when directly supported on the ground. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the square cavity structure in the background art;

[0026] Figure 2 This is a schematic diagram of the overall structure of the square cavity casting mold of the present invention;

[0027] Figure 3 for Figure 2 A half-section diagram;

[0028] Figure 4 This is a schematic diagram of the square cavity structure in this invention, where the excess portion is not removed after curing.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Square cavity; 11. Metal threaded insert; 12. T-shaped sealing groove; 13. Excess part; 2. Mold body; 3. Support leg; 21. First vertical template; 22. Second vertical template; 23. Outer mold cylinder; 24. Inner mold cylinder; 25. Sprue; 210. Cavity; 221. Cross-shaped rib; 27. Top corner; 28. Sprue side; 29. ​​Sprue through groove; 291. Cooling water tank; 292. Support leg fixing hole; 293. Mold closing guide pillar; 295. Inner template rib; 297. Outer mold cylinder flange; 251. Inner mold cylinder fixing hole; 222. Outer mold cylinder through groove; 231. Mold closing bolt; 232. Mold sprue; 233. Venting and shrinkage compensation groove; 244. Support column; 245. Lifting ring; 255. Metal insert positioning bolt. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "equivalent to" should be interpreted broadly. For example, the object "equivalent to" can be a part of the main body, or it can be separately arranged from the main body and connected to it. This connection can be detachable or non-detachable. Those skilled in the art will understand the specific meaning of the above terms in this invention through specific circumstances. The invention will be further described in detail below with reference to embodiments.

[0036] Specific embodiment 1 of the square cavity casting mold provided by the present invention:

[0037] like Figure 2 As shown, the square cavity casting mold includes a mold body 2 and support legs 3. The mold body 2 is a cubic structure with a thickness less than its length and width. Two of its thickness-direction edges are arranged vertically facing each other, and the surface formed by connecting the two edges is perpendicular to the horizontal plane. It is then fixed to four support legs 3 of equal height using bolts.

[0038] like Figure 3 As shown, the mold body 2 includes a first vertical template 21, a second vertical template 22, an outer mold cylinder 23, an inner mold cylinder 24, and a gate component 25.

[0039] like Figure 2 and Figure 3As shown, both the first template 21 and the second template 22 are square structures with weight-reducing holes in their centers, forming a cross-shaped rib 221. Between the edge of the first template 22 and the cross-shaped rib 221, two rows of connecting holes are arranged in a ring. The innermost ring of connecting holes is for connecting to the inner mold cylinder 24 via inner mold cylinder fixing holes 251. The outermost ring of connecting holes allows metal insert positioning bolts 255 to pass through during use, thereby fixing the metal threaded insert 11. A ring of T-shaped protrusions (not shown in the figure) is provided on the opposite sides of the first template 21 and the second template 22. After casting, the T-shaped protrusions form a T-shaped sealing groove for the square cavity 1. The structure of the second template 22 is similar to that of the first template 21, except that the second template 22 does not have inner mold cylinder fixing holes 251. The second template 22 is connected to the outer mold cylinder 23 during use.

[0040] The first vertical template 21 and the inner mold cylinder 24 are pre-assembled as the first part by screws inserted into the fixing hole 251 of the inner mold cylinder. The second vertical template 22 and the outer mold cylinder 23 are pre-assembled as the second part. After the two parts are joined together, they form the mold body 2 and the cavity 210. For example, Figure 3 As shown, a mold closing guide post 293 is fixed on the second upright template 22, and a corresponding positioning hole (not marked in the figure) is opened on the first upright template 21. Before the first part and the second part are aligned, the mold closing guide post 293 is inserted into the positioning hole to guide the alignment of the first part and the second part.

[0041] At the top corner of the first upright template 21, an additional square section forms the gate side 28, which mates with the gate component 25 to form the mold gate 232. To secure the gate component 25 to the first upright template 21, the gate component 25 has a flange and a through-gating groove 29 that passes through the flange and the first upright template 21. The gate component 25 and the first upright template 21 are then fixed together using bolts and nuts. Figure 3 As shown, cooling water grooves 291 are provided on the first upright template 21 and the sprue 25. Support legs fixing holes 292 for connecting to the support legs 3 are provided on both sides of the bottom corners of the first upright template 21 and the second upright template 22.

[0042] like Figure 3 As shown, the inner mold cylinder 24 has a square cylindrical structure. An inner mold plate 295 is welded to the inner side of the inner mold cylinder 24. When in use, the inner mold cylinder rib 295 is welded to the second vertical mold plate 22 to support the inner mold cylinder 24. Of course, in other embodiments, the inner mold cylinder rib 295 can also be welded to the first vertical mold plate 21, or the inner mold cylinder rib 295 can be welded to both the first vertical mold plate 21 and the second vertical mold plate 22.

[0043] The outer mold cylinder 23 is also a square cylindrical structure, with outer mold cylinder flanges 297 at both ends. The mold body 2 has an outer mold cylinder through groove 222 that passes through the outer mold cylinder flange 297 and the first vertical template 21, and also passes through the outer mold cylinder flange 297 and the second vertical template 22. Mold-closing bolts 231 and nuts are installed in the outer mold cylinder through groove 222. The mold-closing bolts 231 between the second vertical template 22 and the outer mold cylinder flange 297 complete the pre-assembly of the second part, while the mold-closing bolts 231 between the first vertical template 21 and the outer mold cylinder flange 297 complete the engagement of the first and second parts.

[0044] The outer mold cylinder 23 has a V-shaped notch on the side near the first vertical template 21 for liquid epoxy resin to flow into the cavity 210 and a sprue connection hole for connecting the sprue 25. The bottom of the sprue 25 is provided with a flange and is connected to the outer mold cylinder 23 by bolts.

[0045] The sprue 25 has a U-shaped structure. During installation, the bottom edge of the sprue is flanged and fastened to the V-shaped notch at the top corner 27 of the outer mold cylinder 23. The sprue 25 and the sprue side on the first vertical template 21 form the mold sprue 232. A venting and shrinkage compensation groove 233 is provided at the intersection of the sprue 232 and the cavity 210. The venting and shrinkage compensation groove 233 has an angle of 15° to 45° with the horizontal plane. Specifically, the venting and shrinkage compensation groove 233 extends from the sprue 232 towards the second vertical template 22 and is inclined towards the inner mold cylinder 24, extending onto the second vertical template 22. Of course, in other embodiments, the angle between the venting and shrinkage compensation groove 233 and the horizontal plane can be designed and changed according to actual conditions. Figure 3 As shown, the venting and shrinkage compensation groove 233 is formed on both the mold gate 232 and the outer mold cylinder 23. After the venting and shrinkage compensation groove 233 is set, when the epoxy resin is poured to the top corner of the mold body 2, the gas at the intersection of the outer mold cylinder 23 and the second vertical mold plate 22 can be discharged in time, avoiding the formation of air holes at this point. In addition, the intersection of the mold gate 232 and the cavity 210 is no longer a sharp corner, which facilitates the discharge of gas.

[0046] like Figure 2 As shown, a support column 244 is installed on the side of the mold body 2, that is, outside the first upright template 21 and the second upright template 22. When the first upright template 21 and the second upright template 22 are laid flat, the support column 244 is supported on the ground. At the same time, a lifting ring 245 is fixed on the outer mold cylinder 23. The lifting ring 245 is used to move the mold body 2 when it is used in conjunction with the lifting equipment.

[0047] In actual use, the first upright template 21 and the outer mold cylinder 23 are pre-set as the first part through threaded parts, and the second upright template 22 and the inner mold cylinder 24 are pre-set as the second part through threaded parts. The first part and the second part are assembled to form the mold body 2. The first part is lifted and placed flat on the operating platform. An appropriate amount of release agent is sprayed into the cavity 210 formed between the pre-set first part and the second part. The release agent is wiped evenly with lint-free paper to ensure that there is no missed application or residue.

[0048] Then, the metal threaded insert 11 is installed in the cavity 210 using the metal insert positioning bolt 255. The first part and the second part are guided to align by the mold closing guide post 231 on the mold body 2. Finally, the mold closing bolt 231 is used to lock them in place.

[0049] After the mold body 2 is assembled, it should be sent to a curing oven for preheating. The preheated mold body 2 is then sent to the vacuum casting box of the casting equipment. The epoxy resin material, which has been processed according to certain process requirements, is poured into the cavity 210 through the mold gate 232 at a certain speed under vacuum. Since there is no horizontal surface inside the cavity 210, the epoxy resin can gradually fill the cavity 210 from bottom to top. When the material is poured to about 90% of its total weight, the pouring speed is appropriately reduced so that the residual air in the cavity 210 can be discharged through the venting and shrinkage compensation groove 233.

[0050] like Figure 4 As shown, after the square cavity 1 has been poured and solidified, the mold body 2 is opened and the square cavity 1 is removed. When its temperature drops to room temperature, the gate and excess parts 13 are removed using a cutting tool, and a smooth transition polishing process is performed to obtain a product that conforms to the requirements of the drawing.

[0051] In this embodiment, the inner mold cylinder ribs constitute a support plate for supporting the inner mold cylinder. It should be noted that the first and second upright templates are relative concepts.

[0052] Specific embodiment 2 of the square cavity casting mold provided by the present invention:

[0053] The main difference from Embodiment 1 is that in Embodiment 1, the mold gate is offset at the first vertical mold plate, and an venting and shrinkage compensation groove is provided on the inner wall of the outer mold cylinder at the intersection of the gate and the cavity. This venting and shrinkage compensation groove extends from the mold gate towards the second vertical mold plate and is inclined towards the inner mold cylinder, extending onto the second vertical mold plate. In this embodiment, the venting and shrinkage compensation groove extends from the gate towards the second vertical mold plate and is inclined towards the inner mold cylinder, but is spaced a certain distance from the second vertical mold plate.

[0054] Specific embodiment 3 of the square cavity casting mold provided by the present invention:

[0055] The main difference from Embodiment 1 is that in Embodiment 1, an venting and shrinkage compensation groove is provided on the inner wall of the outer mold cylinder at the intersection of the gate and the cavity. The venting and shrinkage compensation groove extends from the gate towards the second vertical mold plate and is inclined towards the inner mold cylinder. Moreover, the venting and shrinkage compensation groove is formed on both the mold gate and the outer mold cylinder. In this embodiment, the venting and shrinkage compensation groove is only formed on the outer mold cylinder.

[0056] Specific embodiment 4 of the square cavity casting mold provided by the present invention:

[0057] The main difference from Embodiment 1 is that in Embodiment 1, the mold gate is offset from the first vertical template, and an venting and shrinkage compensation groove is provided on the inner wall of the cavity. In this embodiment, the width of the mold gate is equal to the distance between the first and second vertical templates, so there is no need to provide an venting and shrinkage compensation groove.

[0058] Specific embodiment 5 of the square cavity casting mold provided by the present invention:

[0059] In Example 1, a mold-closing guide post is fixed on the second mold stand, and a corresponding positioning hole is provided on the first mold stand. In this example, the mold-closing guide post is located on the first mold stand, while the positioning hole is located on the second mold stand. In other examples, the mold-closing guide post and positioning hole are omitted, and external tooling is used to ensure alignment and mold closing during mold closing.

[0060] Specific embodiment 6 of the square cavity casting mold provided by the present invention:

[0061] In Example 1, the first vertical template and the inner mold cylinder are pre-assembled as the first part, and the second vertical template and the outer mold cylinder are pre-assembled as the second part. The first part and the second part are assembled to form the mold body. In this example, the first vertical template and the outer mold cylinder are pre-set as the first part via threaded fittings, and the second vertical template and the inner mold cylinder are pre-set as the second part via threaded fittings. The first part and the second part are assembled to form the mold body. In other examples, the inner mold cylinder is directly connected to both the first and second vertical templates, and the outer mold cylinder is also directly connected to both the first and second vertical templates, and is no longer pre-assembled as two parts.

[0062] Specific embodiment 7 of the square cavity casting mold provided by the present invention:

[0063] The main difference from Embodiment 1 is that in Embodiment 1, both the first and second vertical templates are provided with protrusions for forming sealing grooves, and both the first and second vertical templates are equipped with threaded parts for fixing metal threaded inserts. In this embodiment, when the square cavity has a sealing groove at only one end or a metal threaded insert at only one end, the first and second vertical templates may have only one protrusion or threaded part.

[0064] Specific embodiment 8 of the square cavity casting mold provided by the present invention:

[0065] The main difference from Embodiment 1 is that in Embodiment 1, the outer mold cylinder has flanges on both sides, and the mold body includes flanges penetrating the outer mold cylinder and through slots on the corresponding first or second template. The mold body also includes bolt and nut assemblies located through the through slots to connect the outer mold cylinder and the first or second template. In this embodiment, the mold body includes flanges penetrating the outer mold cylinder and connecting holes on the corresponding first or second template. The mold body also includes bolt and nut assemblies located through the connecting holes to connect the outer mold cylinder and the first or second template.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A square cavity casting mold, characterized in that: The mold includes a mold body (2) and support legs (3) for supporting the mold body (2). The mold body (2) includes a first vertical template (21) and a second vertical template (22) arranged horizontally at intervals. An outer mold cylinder (23) and an inner mold cylinder (24) are assembled between the first vertical template (21) and the second vertical template (22). The first vertical template (21), the second vertical template (22), the outer mold cylinder (23), and the inner mold cylinder (24) cooperate to form an annular cavity (210). The first vertical template (21) and the second vertical template (22) are both square structures. The first vertical template (21) and the second vertical template (22) are both fixed to the support legs (3) with two of their vertices facing each other vertically and the line connecting them perpendicular to the horizontal plane. At least one of the first vertical template (21) and the second vertical template (22) is fixed to the support legs (3). The mold body (2) is provided with a protrusion for forming a sealing groove. At least one of the first mold plate (21) and the second mold plate (22) is equipped with a threaded part for fixing a metal threaded insert (11). The top of the mold body (2) is provided with a mold gate (232) located at the uppermost apex. The mold gate (232) communicates with the cavity (210). In the spacing direction of the first mold plate (21) and the second mold plate (22), the mold gate (232) is offset at the first mold plate (21). The inner wall of the outer mold cylinder (23) is provided with an venting and shrinkage compensation groove (233) at the intersection of the mold gate (232) and the cavity (210). The venting and shrinkage compensation groove (233) extends from the mold gate (232) to the second mold plate (22) and is inclined toward the inner mold cylinder (24).

2. The square cavity casting mold according to claim 1, characterized in that: The exhaust gas filling groove (233) extends to the second upright template (22).

3. The square cavity casting mold according to claim 1, characterized in that: The venting and shrinkage groove (233) is formed on both the mold gate (232) and the outer mold cylinder (23).

4. The square cavity casting mold according to claim 1, characterized in that: The exhaust gas filling groove (233) has an angle of 15° to 45° with the horizontal plane.

5. The square cavity casting mold according to any one of claims 1-4, characterized in that: One of the first template (21) and the second template (22) is pre-set as the first part by the outer mold cylinder (23) through a threaded part, and the other is pre-set as the second part by the inner mold cylinder (24) through a threaded part. The first part and the second part are assembled to form the mold body (2).

6. The square cavity casting mold according to claim 5, characterized in that: One of the first template (21) and the second template (22) is provided with a mold closing guide post (293), and the other is provided with a positioning hole corresponding to the mold closing guide post (293). The mold closing guide post (293) is used to be inserted into the positioning hole before the first part and the second part are aligned.

7. The square cavity casting mold according to any one of claims 1-4, characterized in that: At least one of the first template (21) and the second template (22) is provided with a support plate, which is used to support the inner mold cylinder (24).

8. The square cavity casting mold according to any one of claims 1-4, characterized in that: The outer mold cylinder (23) has flanges on both sides. The mold body (2) includes a through groove that passes through the flange (297) of the outer mold cylinder and the first upright template (21) or the second upright template (22) on the corresponding side. The mold body also includes a bolt and nut assembly located through the through groove to connect the outer mold cylinder (23) with the first upright template (21) or the second upright template (22).

9. The square cavity casting mold according to any one of claims 1-4, characterized in that: Support columns (244) are installed on the first upright template (21) and the second upright template (22), and the support columns (244) are used to support the first upright template (21) and the second upright template (22) on the ground when they are laid flat.

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