Integrated die-casting die for aluminum shell of overedger and die-casting method of integrated die-casting die

Abstract

The integrated die-casting die comprises a bottom die body, a top die body and a side die body, the side die body is detachably connected with the bottom die body and the top die body, cooling pipes are arranged in the side die body, the bottom die body and the top die body, one end of each cooling pipe is provided with a plug connector, and the other end of each cooling pipe is provided with a connecting piece; the plug connectors and the connecting pieces are arranged on the binding faces of the side die set, the bottom die and the top die in an embedded mode, when the side die set is spliced with the bottom die and the top die, the plug connectors on all the binding faces are opposite to the connecting pieces in position, and after cooling liquid is injected into the connecting pipes, the plug connectors are inserted into the connecting pieces. The side die sets, the bottom die and the top die are provided with connecting pieces and inserting pieces, cooling pipes of the bottom die, the top die and the side die sets are communicated through the inserting pieces and the connecting pieces, cooling liquid is communicated through the inserting pieces and the connecting pieces, installation is convenient, and the cooling effect is improved. And seamless contact is achieved through cooperation of the inserting pieces and the connecting pieces, and the sufficiency of heat exchange can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of casting of overlock machine casings, and in particular relates to an integrated die-casting die for an aluminum casing of an overlock machine and a die-casting method thereof. Background Art

[0002] The overchain stitching machine uses a sewing thread to lock the edge of the sewing material behind the thread end to prevent the thread end from pulling out and the fabric from cracking. The overchain stitching machine is equipped with an aluminum casing. Since the overchain stitching machine requires high strength and high dimensional accuracy, strict requirements are placed on its production.

[0003] The Chinese invention patent with application number 202010976932.0 discloses a method for processing an aluminum casing of a seaming machine, including S1: preparing an aluminum casing blank by low-pressure casting; S2: rough machining the aluminum casing blank in S1 to obtain a primary aluminum casing; S3: injecting graphite into the top column hole of the primary aluminum casing to perform fine machining of the primary aluminum casing; S4: performing anodizing process on the top of the primary aluminum casing after S3 to obtain a finished aluminum casing; S5: lubricating the processing equipment in S2 and S3. The aluminum casing blank is prepared by low-pressure casting; then rough machining, fine machining, and anodizing are performed, wherein the anodizing is performed in an electrophoresis tank at a temperature of 20-25°C; the lubricant component of the processing equipment is 95% to 97% of mineral oil, and 3% to 5% of extreme pressure agent is added, and the processing equipment includes a lathe and a drilling machine. The present invention proposes a method for processing an aluminum casing of a seaming machine, which adopts the above-mentioned scheme and improves processing efficiency and processing accuracy through reasonable process arrangement and processing parameters, reduces the cutting force of the drilling machine, avoids machine tool jamming, and increases the surface hardness of the aluminum casing, thereby improving the quality of the aluminum casing.

[0004] In the above technical solution, the equipment utilization rate and the quality of the aluminum casing are improved mainly through the design of the process flow. However, there are still deficiencies in the improvement of the aluminum casing mold itself in the prior art. First, the above solution does not cool the mold with the water generated during fine processing. Secondly, for low-boiling point lubricants, if the cooling effect is not good, it is easy to evaporate, resulting in poor lubrication effect. Finally, the mold cavity structure is complex and not easy to form. Therefore, how to achieve rapid demoulding, ensure cooling effect, and improve forming effect is a problem currently faced by the aluminum casing manufacturing industry of overlock sewing machines.

[0005] Therefore, we need to design an integrated die-casting mold for the aluminum casing of a seaming machine and a die-casting method thereof to solve these problems. Summary of the invention

[0006] The problem to be solved by the present invention is to provide an integrated die-casting die for an aluminum casing of an overlock sewing machine and a die-casting method thereof.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An integrated die-casting mold for an aluminum casing of a seaming machine comprises a bottom mold, a top mold and a side mold group, wherein the side mold group is detachably connected to the bottom mold and the top mold, and cooling pipes are arranged inside the side mold group, the bottom mold and the top mold, a plug-in component is arranged at one end of the cooling pipe, and a connecting component is arranged at the other end, and the plug-in component and the connecting component are embedded in the fitting surfaces of the side mold group, the bottom mold and the top mold. When the side mold group is assembled with the bottom mold and the top mold, the plug-in components and the connecting components on all fitting surfaces are positioned opposite to each other, and when coolant is injected into the connecting pipe, the plug-in component will be inserted into the connecting component.

[0009] Preferably, the side mold group includes at least two first side molds, at least two second side molds and at least four positioning molds, two of the first side molds and two of the second side molds are arranged between two adjacent positioning molds, and two of the first side molds are opposite to each other, and two of the second side molds are opposite to each other.

[0010] Preferably, a positioning column is fixedly provided on the bottom surface of the positioning mold, and a guide column is fixedly provided on the top surface, a positioning hole is provided on the bottom mold, and the positioning column matches the positioning hole, and a guide hole is provided on the positioning mold, and the guide hole matches the guide column.

[0011] Preferably, the connector includes a plug-in hole, an input ring groove is provided on the inner wall of the plug-in hole, one end of the cooling tube is connected with the plug-in hole through the input ring groove, a trigger hole is also provided on the end face of the plug-in hole, the trigger hole is connected with the cooling tube, a plug-in limit ring is fixedly provided in the plug-in hole, a liquid passing pipe is fitted on the inner side of the plug-in limit ring, a sealing block is provided at one end of the liquid passing pipe, a liquid inlet groove is provided on the sealing block, a connecting block is provided at the other end of the liquid passing pipe, a liquid outlet groove is provided on the connecting block, and the liquid inlet groove and the liquid outlet groove are connected through the liquid passing pipe, and a plug-in reset spring is also provided on the liquid passing pipe, and the reset spring is located between the sealing block and the plug-in limit ring.

[0012] Preferably, the connecting member includes a connecting hole, an output ring groove is provided on the inner wall of the connecting hole, the other end of the cooling tube is connected with the connecting hole through the output ring groove, a sealing block is slidably provided in the connecting hole, a reset hole is provided on the end surface of the connecting hole, a connecting limit ring, a push plate and a connecting reset spring are provided in the reset hole, the connecting limit ring is fixedly provided on the side wall close to the opening end of the reset hole, the push plate is located between the connecting reset spring and the connecting limit ring, and a connecting rod is also fixedly provided on the push plate, and the free end of the connecting rod is connected to the sealing block.

[0013] Preferably, a die-casting hole is provided in the middle of the bottom mold.

[0014] Preferably, a first bracket is fixedly provided on the first side mold, and a second bracket is fixedly provided on the second side mold.

[0015] Preferably, the longitudinal sections of the guide column and the guide hole are isosceles trapezoids.

[0016] The die-casting method of the integrated die-casting die for the aluminum casing of the overlock sewing machine comprises the following steps:

[0017] Step 1: Prepare and assemble the mold;

[0018] Step 2: Prepare casting raw materials, melt, purify and refine the raw materials, and preheat the mold cavity while refining the raw materials;

[0019] Step 3: transporting the refined raw materials to the injection device;

[0020] Step 4: Mix the boron nitride coating and the thermal insulation coating and spray them evenly on the inner wall of the mold cavity;

[0021] Step 5: Start one-piece die casting and gradually cool the casting;

[0022] Step 6: After pouring, take out the casting.

[0023] The advantages and positive effects of the present invention are:

[0024] 1. The present invention arranges connectors and plug-in components on each module, and utilizes the delivered coolant to connect the plug-in components with the connectors, so that the coolant can flow in the mold, which is beneficial to improving the adequacy of heat exchange and the cooling effect.

[0025] 2. The mold of the present invention adopts a modular assembly method as a whole, which reduces the difficulty of production and transportation and facilitates the maintenance, replacement and assembly of the mold.

[0026] 3. The various modules of the mold of the present invention are quickly aligned through the cooperation of the positioning columns and the positioning holes, and then fixed by screws. The cooperation of the guide columns and the guide holes ensures that the side mold group and the bottom mold are accurately docked, achieving rapid installation, improving installation accuracy, and ensuring the integrity of the mold cavity.

[0027] 4. The connectors and connections can not only use the flowing coolant to achieve connectivity, which is convenient for connection, but also automatically disconnect when the coolant stops being delivered. The ends of the cooling pipes can be sealed to prevent debris from entering and clogging the cooling pipes during storage and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the connection structure between the positioning mold and the top plate and the bottom plate of the present invention;

[0031] Figure 3 It is a schematic diagram of the internal structure of the side mold assembly of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure before the plug connector of the present invention is connected to the connecting hole;

[0033] Figure 5 It is a schematic diagram of the structure after the plug connector of the present invention is connected to the connecting hole.

[0034] The following are the descriptions of the reference numerals:

[0035] 1. Bottom mold; 2. Top mold; 3. Positioning mold; 4. First side mold; 5. Second side mold; 6. First bracket; 7. Second bracket; 8. Positioning hole; 9. Positioning column; 10. Connecting block; 11. Output ring groove; 12. Guide column; 13. Guide hole; 14. Cooling pipe; 15. Die-casting hole; 16. Plug-in hole; 17. Blocking block; 18. Liquid inlet groove; 19. Trigger hole; 20. Plug-in reset spring; 21. Liquid outlet groove; 22. Plug-in limit ring; 23. Connecting hole; 24. Sealing block; 25. Connecting rod; 26. Reset hole; 27. Connecting reset spring; 28. Push plate; 29. ​​Connecting limit ring; 30. Liquid passage pipe; 31. Plug-in piece; 32. Connecting piece; 33. Input ring groove. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0038] The present invention will be further described below in conjunction with the accompanying drawings:

[0039] Example 1: Please refer to Figures 1 to 3 The present embodiment provides an integrated die-casting mold for an aluminum casing of a seaming machine, comprising a bottom mold 1, a top mold 2 and a side mold group, the side mold group comprising at least two first side molds 4, at least two second side molds 5 and at least four positioning molds 3, the two first side molds 4 and the two second side molds 5 are respectively arranged between two adjacent positioning molds 3, and one end of the two first side molds 4 is opposite, and the two second side molds 5 are opposite, a positioning column 9 is fixedly arranged on the bottom surface of the positioning mold 3, and a guide column 12 is fixedly arranged on the top surface, and the side mold group is detachably connected to the bottom mold 1 and the top mold 2.

[0040] Specifically, the bottom mold 1 and the top mold 2 are arranged opposite to each other, and cooling pipes 14 are arranged inside the bottom mold 1, the top mold 2 and all the side molds. A connector 31 is arranged at one end of the cooling pipe 14, and a connector 32 is arranged at the other end. The connector 31 and the connector 32 are embedded in two corresponding surfaces of all the side molds, the bottom mold 1 and the top mold 2.

[0041] When installing the mold, first complete the assembly of the side mold group, then complete the bottom mold 1 and the side mold group through the cooperation of the positioning column 9 and the positioning hole 8, and make each positioning mold 3 cooperate with the top mold 2 through the cooperation of the guide column 12 and the guide hole 13. Due to the setting of the positioning column 9 and the guide column 12, during installation, it is only necessary to insert the positioning column 9 into the inner casing of the positioning hole 8 to achieve connection and positioning, and push the guide column 12 into the guide hole 13 to complete the installation of the top mold 2 very conveniently and accurately. After the coolant is injected into the cooling pipe 14, the top mold 2, the bottom mold 1 and the side mold group can dissipate heat, and when the coolant flows along the cooling pipe 14 to the connector 31, it will push the connector 31 to complete the connection with the connector 32, and will overcome the elastic force of the connector reset spring 20 and the connection reset spring 27 when plugging in, so that the connector 31 is inserted into the connector 32, thereby ensuring that the bottom mold 1, the top mold 2 and the side mold group can withstand more heat transmitted from the mold body, and under the action of the coolant, the service life and precision of the mold are guaranteed.

[0042] See also Figures 4 to 5The plug-in component 31 includes a plug-in hole 16, an input ring groove 33 is arranged on the inner wall of the plug-in hole 16, one end of the cooling tube 14 is connected with the plug-in hole 16 through the input ring groove 33, a trigger hole 19 is also arranged on the end surface of the plug-in hole 16, the trigger hole 19 is connected with the cooling tube 14, a plug-in limit ring 22 is fixedly arranged in the plug-in hole 16, a liquid passing pipe 30 is fitted on the inner side of the plug-in limit ring 22, a blocking block 17 is arranged at one end of the overnight pipe, a liquid inlet groove 18 is arranged on the blocking block 17, a connecting block 10 is arranged at the other end of the liquid passing pipe 30, a liquid outlet groove 21 is arranged on the connecting block 10, and the liquid inlet groove 18 is connected with the liquid outlet groove 21 through the liquid passing pipe 30, and the liquid passing pipe 30 is also covered with The plug-in reset spring 20 and the plug-in reset spring 22 are located between the sealing block 17 and the plug-in limit ring 22. During installation, in order to ensure more accurate insertion and to ensure that when the plug-in component 31 is inserted into the connecting component 32, there is no leakage at the connection between the plug-in component 31 and the connecting component 32, it is necessary to ensure that the plug-in component 31 and the connecting component 32 are sealed. Since a movable sealing block 17 is provided in the plug-in component 31, when the plug-in component 31 is inserted into the connecting hole 23, the sealing block 17 will be driven to move, so that the plug-in hole 16, the liquid pipe 30 and the connecting hole 23 are connected, and the coolant in the liquid inlet groove 18 will flow into the connecting hole 23 through the liquid outlet groove 21, so that the flow path of the coolant is connected. The connecting member 32 includes a connecting hole 23, an output ring groove 11 is provided on the inner wall of the connecting hole 23, the other end of the cooling tube 14 is connected to the connecting hole 23 through the output ring groove 11, a sealing block 24 is slidably provided in the connecting hole 23, a reset hole 26 is provided on the end surface of the connecting hole 23, the hole passes through the connecting hole 23, a connecting limit ring 29, a push plate 28 and a connecting reset spring 27 are provided in the reset hole 26, the connecting limit ring 29 is fixedly provided on the side wall near the opening end of the reset hole 26, the push plate 28 is located between the connecting reset spring 27 and the connecting limit ring 29, and a connecting rod 25 is also fixedly provided on the push plate 28, the free end of the connecting rod 25 is connected to the sealing block 24, when the mold is installed , the connector 31 is aligned with the connector 32, the connecting block 10 will push the sealing block 24 to move, and the sealing block 24 will be reset under the action of the connection reset spring 27, so that the connector 31 is inserted into the seal, and under the action of the coolant, the connector 31 and the connector 32 will expand, so that the connector 31 and the connector 32 are tightly fitted, thereby ensuring the sealing of the connector 31 and the connector 32; a first bracket 6 is fixedly provided on the first side mold 4, and a second bracket 7 is fixedly provided on the second side mold 5. Since the first side mold 4 and the second side mold 5 are heavy after molding and have irregular shapes, the first bracket 6 and the second bracket 7 are equivalent to carrying the first side mold 4 and the second side mold 5.

[0043] The bottom mold 1, the top mold 2 and the side mold group are fixed together. When fixed, the positioning column 9 on the bottom mold 1 is inserted into the positioning hole 8, and the outer wall of the positioning column 9 is in contact with the inner wall of the positioning hole 8, which can ensure the connection accuracy between the bottom mold 1 and the first side mold 4, the second side mold 5 and the positioning mold 3. The guide column 12 is inserted into the guide hole 13, which can ensure the connection accuracy between the first side mold 4 and the second side mold 5 and the bottom mold 1, the top mold 2, and the high efficiency and high quality of the mold. A die-casting hole 15 is provided in the middle of the bottom mold 1. The device performs die-casting through the die-casting hole 15, so that it can be die-casted in one time. At the same time, coolant is injected into the cooling pipe 14 of the bottom mold 1, the top mold 2 and the side mold group during die-casting, which can improve the cooling effect.

[0044] The die-casting method of the integrated die-casting die for the aluminum casing of the overlock sewing machine comprises the following steps:

[0045] Step 1: Prepare and install the mold;

[0046] Step 2: Prepare casting raw materials, melt, purify and refine the raw materials, and preheat the mold cavity while refining the raw materials;

[0047] Step 3: transporting the refined raw materials to the injection device;

[0048] Step 4: Mix the boron nitride coating and the thermal insulation coating and spray them evenly on the inner wall of the mold cavity;

[0049] Step 5: Start one-piece die casting and gradually cool the casting;

[0050] Step 6: After pouring, take out the casting. This method can reduce the oxidation chance of the raw materials, reduce defects, etc., thereby improving the yield rate. One-piece die casting after spraying can not only improve the yield rate, but also increase the molding speed.

[0051] Compared with the prior art, the present invention sets four positioning molds 3, which cooperate with the first side molds 4 and the second side molds 5 that are opposite to each other, so as to not only ensure the convenient installation and tight connection of the cooling pipe 14, but also, when installing the mold, the cooperation of the positioning column 9 and the positioning hole 8 makes the bottom mold 1 cooperate with the side mold group, and the cooperation of the guide column 12 and the guide hole 13 makes the side mold group cooperate with the bottom mold 1, and the positioning mold 3 is connected with the first side mold 4 and the second side mold 5 through a plurality of snap-fit ​​grooves and snap-fit ​​blocks, which can ensure the stability and firmness of the connection, and then inject coolant to cool the bottom mold 1, the top mold 2 and the side mold group, thereby ensuring the service life and precision of the mold, simplifying the production process, and improving product quality and production efficiency.

[0052] The working process of this embodiment is as follows: during operation, the positioning mold 3 on the side mold group is inserted into the positioning hole 8 correspondingly by using the positioning column 9, and then the two first side molds 4 are installed between the two positioning molds 3 by using the first bracket 6, and then the second side mold 5 is installed between the two positioning molds 3 by using the second bracket 7, and finally the top mold 2 is installed on the top of the side mold group, and the mold is fixed by bolts, and then the assembled mold is transferred to the injection device, the die-casting hole 15 on the bottom mold 1 is aligned with the injection port on the injection device, and then the integrated die-casting furnace is started for die-casting. After the die-casting is completed, the coolant is injected into the cooling pipe 14 through the connector 32, so that the coolant enters the cooling pipe 14 and starts to circulate. Before the coolant enters the cooling pipe 14 and circulates, the connector 31 and the connector 32 are as Figure 4 As shown, when the coolant in the cooling pipe 14 enters, it will enter the input annular groove 33. At this time, since the blocking block 17 blocks the input annular groove 33, the coolant will enter the plug hole 16 along the trigger hole 19 and push the blocking block 17 to move along the axis of the plug hole 16. When the blocking block 17 moves along the axis of the plug hole 16, the plug reset spring 20 will be compressed, and at the same time, the liquid pipe 30 will push the connecting block 10 into the connecting hole 23. When the connecting block 10 enters the connecting hole 23, it will push the sealing block 24 When the sealing block 24 moves toward the reset hole 26, it will push the push plate 28 to compress the connection reset spring 27 through the connecting rod 25. When the blocking block 17 is removed from the input ring groove 33 and the liquid inlet groove 18 is aligned with the input ring groove 33, the liquid outlet groove 21 on the connecting block 10 will also be aligned with the output ring groove 11. At this time, the coolant will flow from the cooling pipe 14 into the input ring groove 33, and then flow into the liquid pipe 30 through the liquid inlet hole, and then flow from the liquid outlet groove 21 into the output ring groove 11, so as to realize the circulation of the coolant.

[0053] The circulating coolant can quickly cool the die-cast product in the mold, allowing the product to be quickly formed.

[0054] When demoulding is required, the injection of coolant will be stopped. At this time, the pressure in the cooling pipe 14 will decrease, the connection reset spring 27 and the plug reset spring 20 will extend, the sealing block 24 will be pushed to reset, and the connecting hole 23 will be sealed. The connecting block 10 will also return to the plug hole 16 to block the plug hole 16 to prevent debris from entering.

[0055] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An integrated die-casting die for an aluminum casing of an overlock sewing machine, characterized in that: The mold assembly comprises a bottom mold (1), a top mold (2) and a side mold group. The side mold group is detachably connected to the bottom mold (1) and the top mold (2). The side mold group, the bottom mold (1) and the top mold (2) are all provided with cooling pipes (14). One end of the cooling pipe (14) is provided with a plug-in connector (31), and the other end is provided with a connecting member (32). The plug-in connector (31) and the connecting member (32) are embedded in the mating surfaces of the side mold group, the bottom mold (1) and the top mold (2). When the side mold group, the bottom mold (1) and the top mold (2) are assembled, the plug-in connector (31) and the connecting member (32) on all the mating surfaces are positioned opposite to each other. When cooling liquid is injected into the connecting pipe, the plug-in connector (31) is inserted into the connecting member (32).

2. The integrated die-casting die for the aluminum casing of an overlock sewing machine according to claim 1, characterized in that: The side mold group comprises at least two first side molds (4), at least two second side molds (5) and at least four positioning molds (3), wherein two of the first side molds (4) and two of the second side molds (5) are arranged between two adjacent positioning molds (3), and two of the first side molds (4) are opposite to each other, and two of the second side molds (5) are opposite to each other.

3. The integrated die-casting die for the aluminum casing of an overlock sewing machine according to claim 2, characterized in that: A positioning column (9) is fixedly arranged on the bottom surface of the positioning mold (3), and a guide column (12) is fixedly arranged on the top surface; a positioning hole (8) is arranged on the bottom mold (1), and the positioning column (9) matches the positioning hole (8); a guide hole (13) is arranged on the positioning mold (3), and the guide hole (13) matches the guide column (12).

4. The integrated die-casting die for an aluminum casing of an overlock sewing machine according to claim 2, characterized in that: The plug-in connector (31) comprises a plug-in hole (16), an input ring groove (33) is arranged on the inner wall of the plug-in hole (16), one end of the cooling tube (14) is connected to the plug-in hole (16) through the input ring groove (33), a trigger hole (19) is also arranged on the end surface of the plug-in hole (16), the trigger hole (19) is connected to the cooling tube (14), a plug-in limit ring (22) is fixedly arranged in the plug-in hole (16), and a liquid passing tube (30) is arranged on the inner side of the plug-in limit ring (22). A blocking block (17) is provided at one end of the liquid passage pipe (30), and a liquid inlet groove (18) is provided on the blocking block (17); a connecting block (10) is provided at the other end of the liquid passage pipe (30), and a liquid outlet groove (21) is provided on the connecting block (10), and the liquid inlet groove (18) is connected to the liquid outlet groove (21) through the liquid passage pipe (30); a plug-in reset spring (20) is also provided on the liquid passage pipe (30), and the reset spring is located between the blocking block (17) and the plug-in limit ring (22).

5. The integrated die-casting die for the aluminum casing of an overlock sewing machine according to claim 4, characterized in that: The connecting member (32) comprises a connecting hole (23), an output ring groove (11) is arranged on the inner wall of the connecting hole (23), the other end of the cooling pipe (14) is connected to the connecting hole (23) through the output ring groove (11), a sealing block (24) is slidably arranged in the connecting hole (23), a reset hole (26) is arranged on the end surface of the connecting hole (23), a connecting limit ring (29), a push plate (28) and a connecting reset spring (27) are arranged in the reset hole (26), the connecting limit ring (29) is fixedly arranged on the side wall close to the opening end of the reset hole (26), the push plate (28) is located between the connecting reset spring (27) and the connecting limit ring (29), and a connecting rod (25) is also fixedly arranged on the push plate (28), and the free end of the connecting rod (25) is connected to the sealing block (24).

6. The integrated die-casting die for the aluminum casing of an overlock sewing machine according to claim 2, characterized in that: A die-casting hole (15) is provided in the middle of the bottom mold (1).

7. The integrated die-casting die for the aluminum casing of an overlock sewing machine according to claim 2, characterized in that: A first bracket (6) is fixedly arranged on the first side mold (4), and a second bracket (7) is fixedly arranged on the second side mold (5).

8. The integrated die-casting die for an aluminum casing of an overlock sewing machine according to claim 3, characterized in that: The longitudinal sections of the guide column (12) and the guide hole (13) are isosceles trapezoids.

9. The die-casting method of the integrated die-casting die for the aluminum casing of the overlock sewing machine according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Prepare and install the mold; Step 2: Prepare casting raw materials, melt, purify and refine the raw materials, and preheat the mold cavity while refining the raw materials; Step 3: transporting the refined raw materials to the injection device; Step 4: Mix the boron nitride coating and the thermal insulation coating and spray them evenly on the inner wall of the mold cavity; Step 5: Start one-piece die casting and gradually cool the casting; Step 6: After pouring, take out the casting.

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