A split-casting structure for thin-walled pipe

Abstract

The application discloses a split-casting structure for a thin-wall pipe, which comprises an upper die, a lower die, a center sand core, an upper sand mold and a lower sand mold, the upper die is arranged on the top of the lower die, the bottom surface of the upper die is provided with an upper forming groove, the top surface of the lower die is provided with a lower forming groove, the center sand core is arranged between the upper forming groove and the lower forming groove, the inner wall of the upper forming groove is provided with a first riser groove and a second riser groove, the inner wall of the lower forming groove is provided with a first pouring channel and a second pouring channel, the upper sand mold is provided with an upper communication hole, the center sand core is provided with a first center hole, the lower sand mold is provided with a first lower communication hole, and the first riser groove, the upper communication hole, the first center hole, the first lower communication hole and the first pouring channel are communicated. The application has the effects of improving the casting integrity and the casting quality of the thin-wall pipe.

Description

Technical Field

[0001] This application relates to the technical field of pipe fitting production, and in particular to a diversion casting structure for thin-walled pipe fittings. Background Technology

[0002] Casting is a manufacturing process that involves pouring molten metal into a mold, allowing it to cool and solidify to obtain a part of the desired shape. It is one of the oldest and most widely used methods in metalworking, suitable for complex geometries, large components, or mass production.

[0003] Currently, when casting thin-walled pipe fittings, an upper mold, a lower mold, and a sand core are required. The sand core is placed in the cavity formed between the upper and lower molds. Molten metal is poured into the gap between the cavity and the sand core through the casting channel. After the molten metal cools, the upper and lower molds are removed, and the sand core inside the pipe fitting is broken. Finally, the excess parts formed at the casting channel and riser are cut off, and the cut area is ground to form the pipe fitting product.

[0004] Regarding the aforementioned technologies, the inventors believe that during the casting production of the aforementioned pipe fittings, the mold temperature is around 300 degrees Celsius, while the molten aluminum temperature is typically above 700 degrees Celsius. During casting, the molten aluminum comes into contact with the mold and is continuously cooled. Furthermore, the sidewalls of the pipe fittings are very thin, and the solidified molten metal during casting can block the gaps used for casting, potentially leading to insufficient casting of the thin-walled sections of the product, thus affecting product quality and yield. Utility Model Content

[0005] In order to improve the casting integrity and casting quality of thin-walled pipe fittings, this application provides a diversion casting structure for thin-walled pipe fittings.

[0006] The technical solution provided in this application for a diversion casting structure for thin-walled pipe fittings is as follows: A diversion casting structure for thin-walled pipe fittings includes an upper mold, a lower mold, a central sand core, an upper sand mold, and a lower sand mold. The upper mold is disposed on top of the lower mold, and an upper forming groove is provided on the bottom surface of the upper mold. A lower forming groove is provided on the top surface of the lower mold. The central sand core is disposed between the upper forming groove and the lower forming groove, and a gap is maintained between the central sand core and the inner walls of the upper and lower forming grooves. A first riser groove and a second riser groove are provided on the inner wall of the upper forming groove, and a first casting channel and a second casting channel are provided on the inner wall of the lower forming groove. The casting channel, the first casting channel and the second casting channel are connected at one end to one of the vertical side walls of the lower mold, the upper mold is disposed between the inner wall of the first riser groove and the central sand core, the lower mold is disposed between the lower forming groove and the central sand core, the upper mold has an upper connecting hole, the central sand core has a first central hole, and the lower mold has a first lower connecting hole. The first riser groove, the upper connecting hole, the first central hole, the first lower connecting hole and the first casting channel are connected end to end.

[0007] By adopting the above technical solution, the mold cavity is cast through the first and second casting channels. The molten metal entering the first casting channel is split. One stream flows sequentially from below through the first lower connecting hole, the first central hole, and the upper connecting hole, finally flowing into the first riser groove to cast the mold cavity. The other stream flows directly from the first and second casting channels into the lower and upper forming tanks to cast the mold cavity. The molten metal is divided into two streams, casting the mold cavity simultaneously from both above and below, reducing the possibility of rapid temperature drop and mold cavity blockage during molten metal overflow casting. Through the cooperation of the upper connecting hole, the first central hole, and the first lower connecting hole, simultaneous casting of the pipe fitting from both sides is achieved, improving the casting integrity and quality of thin-walled pipe fittings.

[0008] Optionally, a second central hole is provided in the central sand core, and a second lower connecting hole is provided in the lower sand mold. The second riser groove, the second central hole, the second lower connecting hole, and the second casting channel are connected at both ends.

[0009] By adopting the above technical solution, the second riser groove, the second central hole, the second lower connecting hole, and the second casting channel form a passage, which further improves the casting speed of molten metal.

[0010] Optionally, a ladle is provided on the vertical sidewall of the lower mold, and two casting grooves are provided on the ladle. The two casting grooves correspond one-to-one with one end of the first casting channel and the second casting channel and are connected to each other.

[0011] By adopting the above technical solution, the ladle and the two casting tanks set on it guide the molten metal, which facilitates the casting of molten metal.

[0012] Optionally, the top surface of the upper sand mold is provided with a plurality of snap-fit ​​grooves, which are connected to the first riser groove.

[0013] By adopting the above technical solution, the molten metal enters the first riser groove and the snap-fit ​​groove simultaneously during casting, and cools and solidifies in the snap-fit ​​groove to form a metal column, thus achieving a stable connection between the metal part and the upper sand mold, which facilitates the simultaneous removal of the upper sand mold and the product during the subsequent demolding process.

[0014] Optionally, a vacuum hole is vertically formed on the upper mold, the bottom end of the vacuum hole is connected to the first riser groove, the other end of the vacuum hole is flush with the top surface of the upper mold, and a vacuum assembly is provided on the top surface of the upper mold, the vacuum assembly including a vacuum tube, one end of the vacuum tube being connected to the vacuum hole.

[0015] By adopting the above technical solution, one end of the vacuum tube is connected to the negative pressure device during the casting process. The vacuum cavity is then evacuated through the vacuum hole, which reduces the possibility of residual air bubbles in the cavity during the casting process and the resulting pores in the finished product, thus helping to improve the production quality of the pipe fittings.

[0016] Optionally, the vacuum assembly further includes a vacuum chamber and a liquid level sensor. The bottom of the vacuum chamber has a delivery hole that communicates with the vacuum hole. The vacuum tube is connected to the top of the vacuum chamber, and the liquid level sensor is located inside the vacuum chamber.

[0017] By adopting the above technical solution, as the casting process proceeds, the liquid level in the mold cavity rises continuously and enters the vacuum chamber through the vacuum hole and the conveying hole. The liquid level sensor detects the liquid level in the vacuum chamber. When the molten metal is detected to have entered the vacuum chamber, it proves that the mold cavity is full of molten metal, and casting is stopped at this time.

[0018] Optionally, the vacuum assembly further includes a connecting half-ring and an mounting half-ring. Two connecting half-rings are provided, and one mounting half-ring is provided on the outer ring wall at the top of each connecting half-ring. The mounting half-ring is connected to the bottom surface of the vacuum chamber through a connector. The two connecting half-rings together form a hollow pipe, and the hollow pipe formed by the two connecting half-rings is simultaneously connected to the vacuum hole and the delivery hole.

[0019] By adopting the above technical solution, after the molten metal solidifies, the two connecting half-rings can be removed from between the vacuum box and the upper mold, which makes it easier for the operator to cut the cast metal rod from the installation position of the connecting half-rings, and facilitates the subsequent demolding of the pipe fittings.

[0020] Optionally, a connecting rubber plug is inserted at the top of the vacuum hole, and a connecting hole is formed on the connecting rubber plug that communicates with the vacuum hole. The connecting rubber plug is sandwiched between the upper mold and the connecting half ring, and the connecting hole communicates with the hollow pipe formed by the two connecting half rings.

[0021] By adopting the above technical solution, the connecting rubber plug is placed between the connecting half-ring and the vacuum box, which improves the sealing performance between the two and reduces the possibility of molten metal leaking out from the connection point.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By cooperating with the upper connecting hole, the first central hole and the first lower connecting hole, the pipe fitting can be cast from both sides at the same time, which can improve the casting integrity and casting quality of thin-walled pipe fittings; 2. The vacuum assembly reduces the possibility of residual air bubbles in the mold cavity during the casting process, which may cause porosity in the finished product, thus helping to improve the production quality of the pipe fittings; 3. A connecting rubber plug is placed between the connecting half-ring and the vacuum box, which improves the sealing performance between the two and reduces the possibility of molten metal leaking out from the connection point. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating a diversion casting structure for thin-walled pipe fittings, as described in the embodiments of this application.

[0024] Figure 2 This is a structural diagram illustrating the internal structure of the lower mold in the embodiments of this application.

[0025] Figure 3 This is a structural diagram illustrating the internal structure of the upper mold in the embodiments of this application.

[0026] Figure 4 This is a partial cross-sectional view used in the embodiments of this application to illustrate the upper sand mold and the lower sand mold.

[0027] Figure 5 This is a partial cross-sectional view used in the embodiments of this application to illustrate the sand mold.

[0028] Figure 6 This is a partial cross-sectional view used to illustrate the vacuum assembly in the embodiments of this application.

[0029] Figure 7 yes Figure 6 Enlarged view of part A in the middle.

[0030] Explanation of reference numerals in the attached drawings: 1. Upper mold; 101. Upper forming groove; 102. First riser groove; 103. Second riser groove; 104. Vacuum hole; 2. Lower mold; 21. Lower forming groove; 22. First casting channel; 23. Second casting channel; 3. Central sand core; 31. First central hole; 32. Second central hole; 4. Ladle; 41. Casting groove; 5. Vacuum assembly; 51. Vacuum box; 511. Conveying hole; 52. Liquid level sensor; 53. Connecting rubber plug; 531. Connecting hole; 54. Connecting half ring; 541. Overlapping ring groove; 55. Installing half ring; 56. Connecting ear plate; 57. Vacuum tube; 6. Lower sand mold; 61. First lower connecting hole; 62. Second lower connecting hole; 7. Upper sand mold; 71. Upper connecting hole; 72. Snap-fit ​​groove. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-7 This application will be further described in detail below. Embodiments of this application provide a diversion casting structure for thin-walled pipe fittings, which improves the casting integrity and casting quality of the thin-walled pipe fittings.

[0032] Reference Figure 1-3 A diversion casting structure for thin-walled pipe fittings includes an upper mold 1, a lower mold 2, a central sand core 3, a ladle 4, and a vacuum assembly 5. The upper mold 1 is fitted onto the top surface of the lower mold 2. The bottom surface of the upper mold 1 has an upper forming groove 101, and the top surface of the lower mold 2 has a lower forming groove 21 corresponding to the position of the upper forming groove 101.

[0033] Reference Figure 2 The inner wall of the lower forming groove 21 is provided with a first casting channel 22 and a second casting channel 23. One end of the first casting channel 22 and the second casting channel 23 is connected to a vertical side wall of the lower mold 2. The ladle 4 is connected to the lower mold 2 by a connector and is set on the vertical side wall of the first casting channel 22 and the second casting channel 23. The inner wall of the ladle 4 is provided with two casting grooves 41, which correspond one-to-one with the first casting channel 22 and the second casting channel 23 and are connected to each other.

[0034] Reference Figure 1 , Figure 3 and Figure 4 The central sand core 3 is placed in the cavity formed by the upper forming groove 101 and the lower forming groove 21, and the surface of the central sand core 3 maintains a gap with the inner walls of the upper forming groove 101 and the lower forming groove 21. A lower sand mold 6 is provided in the lower forming groove 21, and the lower sand mold 6 is located between the lower forming groove 21 and the central sand core 3. A first riser groove 102 and a second riser groove 103 are provided on the inner wall of the upper forming groove 101, and an upper sand mold 7 is provided in the upper forming groove 101, and the upper sand mold 7 is located between the first riser groove 102 and the central sand core 3.

[0035] Reference Figure 4 The upper sand mold 7 has an upper connecting hole 71, the central sand core 3 has a first central hole 31 and a second central hole 32, and the lower sand mold 6 has a first lower connecting hole 61 and a second lower connecting hole 62. The first riser groove 102, the upper connecting hole 71, the first central hole 31, the first lower connecting hole 61, and the first casting channel 22 are arranged sequentially and connected end to end. The second riser groove 103, the second central hole 32, the second lower connecting hole 62, and the second casting channel 23 are arranged sequentially and connected end to end.

[0036] Reference Figure 5-7 A vacuum hole 104 is vertically formed in the upper mold 1. One end of the vacuum hole 104 is flush with the top surface of the upper mold 1, and the other end is connected to the first riser groove 102. A vacuum assembly 5 is disposed on the top surface of the upper mold 1. The vacuum assembly 5 includes a vacuum chamber 51, a liquid level sensor 52, a connecting rubber plug 53, a connecting half-ring 54, a mounting half-ring 55, a connecting ear plate 56, and a vacuum tube 57. A connecting hole 531 is formed inside the connecting rubber plug 53, communicating with the vacuum hole 104. Two connecting half-rings 54 are symmetrically arranged. One side of each connecting half-ring 54 is rotatably connected, and the other side is connected to the connecting ear plate 56. The connecting ear plates 56 on the two connecting half-rings 54 are connected by a connector. One mounting half-ring 55 is provided on the outer ring wall at the top of each connecting half-ring 54. The mounting half-ring 55 is connected to the bottom surface of the vacuum chamber 51 by a connector. The hollow pipe formed by the two connecting half-rings 54 is connected to the connecting hole 531. The inner ring wall of the connecting half-ring 54 is provided with an overlapping ring groove 541 for inserting the connecting rubber plug 53. The top end of the connecting rubber plug 53 is inserted into the overlapping ring groove 541.

[0037] Reference Figure 5 and Figure 7 A vacuum chamber 51 is positioned above the connecting half-ring 54. A conveying hole 511 is formed on the bottom wall of the vacuum chamber 51, and the conveying hole 511 communicates with the hollow pipe formed by the two connecting half-rings 54. A vacuum tube 57 is connected to the top of the vacuum chamber 51, and a liquid level sensor 52 is located inside the vacuum chamber 51. Several snap-fit ​​grooves 72 are formed on the top surface of the upper sand mold 7, and the snap-fit ​​grooves 72 communicate with the first riser groove 102.

[0038] Reference Figure 2-4When casting the pipe fittings, molten metal is poured into ladle 4. Two casting tanks 41 guide the molten metal, which then flows through the first casting channel 22 and the second casting channel 23 into the cavity formed by the upper forming tank 101 and the lower forming tank 21. The molten metal is then divided within the cavity: one stream flows into the lower forming tank 21 and overflows upwards for casting; another stream flows sequentially through the first casting channel 22, the first lower connecting hole 61, the first central hole 31, the upper connecting hole 71, and the first riser groove 102, pouring from top to bottom; and a third stream flows sequentially through the second casting channel 23, the second lower connecting hole 62, the second central hole 32, and the second riser groove 103, pouring from top to bottom. Because the molten metal is poured into the cavity simultaneously from both above and below, it helps reduce the possibility of incomplete casting due to solidification within the cavity. Figure 5 The molten metal in the first riser groove 102 enters the snap-fit ​​groove 72 and solidifies to form a metal column, which is stably connected to the upper sand mold 7, making it convenient to remove the upper sand mold 7 and the product together.

[0039] Reference Figure 7 During the casting of the pipe fittings, one end of the vacuum tube 57 is connected to a negative pressure device (not shown in the attached diagram). Vacuuming is performed on the cavity between the upper mold 1 and the lower mold 2 through the vacuum hole 104, reducing the air bubble content in the molten metal. This helps reduce porosity in the pipe fittings and improves their production quality. As the molten metal is poured, it enters the vacuum chamber 51 through the vacuum hole 104 and the conveying hole 511. When the liquid level sensor 52 detects the presence of molten metal in the vacuum chamber 51, casting is stopped. After the molten metal cools and solidifies, the connecting half-ring 54 is removed, and the metal rod at the connecting half-ring 54 is cut to facilitate subsequent demolding of the pipe fittings. A connecting rubber plug 53 is placed between the connecting half-ring 54 and the upper mold 1, improving the seal between them and reducing the possibility of molten metal overflowing from gaps.

[0040] The implementation principle of the diversion casting structure for thin-walled pipe fittings in this embodiment is as follows: When casting the pipe fittings, molten metal is poured into the ladle 4, and the molten metal is injected into the cavity formed by the upper forming groove 101 and the lower forming groove 21 through the first casting channel 22 and the second casting channel 23. The molten metal is diverted within the cavity, and the molten metal is poured into the cavity from both above and below, which helps to reduce the possibility of incomplete casting caused by the molten metal solidifying in the cavity.

[0041] When casting the pipe fittings, one end of the vacuum tube 57 is connected to a negative pressure device (not shown in the attached figure), and a vacuum operation is performed on the cavity between the upper mold 1 and the lower mold 2 through the vacuum hole 104, which reduces the bubble content in the molten metal, helps to reduce the porosity in the pipe fittings, and improves the production quality of the pipe fittings.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A diversion casting structure for thin-walled pipe fittings, characterized in that: The system includes an upper mold (1), a lower mold (2), a central sand core (3), an upper sand mold (7), and a lower sand mold (6). The upper mold (1) is located on top of the lower mold (2). The bottom surface of the upper mold (1) is provided with an upper forming groove (101). The top surface of the lower mold (2) is provided with a lower forming groove (21). The central sand core (3) is located between the upper forming groove (101) and the lower forming groove (21). The central sand core (3) has a gap with the inner walls of the upper forming groove (101) and the lower forming groove (21). The inner wall of the upper forming groove (101) is provided with a first riser groove (102) and a second riser groove (103). The inner wall of the lower forming groove (21) is provided with a first casting channel (22) and a second casting channel (23). 3) One end of the first casting channel (22) and the second casting channel (23) is connected to one of the vertical side walls of the lower mold (2). The upper sand mold (7) is located between the inner wall of the first riser groove (102) and the central sand core (3). The lower sand mold (6) is located between the lower forming groove (21) and the central sand core (3). The upper sand mold (7) has an upper connecting hole (71). The central sand core (3) has a first central hole (31). The lower sand mold (6) has a first lower connecting hole (61). The first riser groove (102), the upper connecting hole (71), the first central hole (31), the first lower connecting hole (61) and the first casting channel (22) are connected end to end.

2. The diversion casting structure for thin-walled pipe fittings according to claim 1, characterized in that: The central sand core (3) has a second central hole (32), and the lower sand mold (6) has a second lower connecting hole (62). The second riser groove (103), the second central hole (32), the second lower connecting hole (62) and the second casting channel (23) are connected end to end.

3. The diversion casting structure for thin-walled pipe fittings according to claim 1, characterized in that: The lower mold (2) has a casting ladle (4) on its vertical side wall. The casting ladle (4) has two casting grooves (41). The two casting grooves (41) correspond to and are connected to one end of the first casting channel (22) and the second casting channel (23).

4. The diversion casting structure for thin-walled pipe fittings according to claim 1, characterized in that: The top surface of the upper sand mold (7) is provided with several snap-fit ​​grooves (72), which are connected to the first riser groove (102).

5. A diversion casting structure for thin-walled pipe fittings according to claim 1, characterized in that: A vacuum hole (104) is vertically opened on the upper mold (1). The bottom end of the vacuum hole (104) is connected to the first riser groove (102). The other end of the vacuum hole (104) is flush with the top surface of the upper mold (1). A vacuum assembly (5) is provided on the top surface of the upper mold (1). The vacuum assembly (5) includes a vacuum tube (57). One end of the vacuum tube (57) is connected to the vacuum hole (104).

6. A diversion casting structure for thin-walled pipe fittings according to claim 5, characterized in that: The vacuum assembly (5) also includes a vacuum chamber (51) and a liquid level sensor (52). The bottom of the vacuum chamber (51) is provided with a conveying hole (511), which is connected to the vacuum hole (104). The vacuum tube (57) is connected to the top of the vacuum chamber (51), and the liquid level sensor (52) is located in the vacuum chamber (51).

7. A diversion casting structure for thin-walled pipe fittings according to claim 6, characterized in that: The vacuum assembly (5) further includes a connecting half-ring (54) and an mounting half-ring (55). There are two connecting half-rings (54), and one mounting half-ring (55) is provided on the outer ring wall at the top of each connecting half-ring (54). The mounting half-ring (55) is connected to the bottom surface of the vacuum box (51) through a connector. The two connecting half-rings (54) together form a hollow pipe. The hollow pipe formed by the two connecting half-rings (54) is simultaneously connected to the vacuum hole (104) and the delivery hole (511).

8. A diversion casting structure for thin-walled pipe fittings according to claim 7, characterized in that: A connecting rubber plug (53) is inserted at the top of the vacuum hole (104). The connecting rubber plug (53) has a connecting hole (531) that communicates with the vacuum hole (104). The connecting rubber plug (53) is sandwiched between the upper mold (1) and the connecting half ring (54). The connecting hole (531) communicates with the hollow pipe formed by the two connecting half rings (54).

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