Die core assembly of die-casting die and universal die frame

Abstract

The utility model provides a die core assembly of a die-casting die and a universal die frame, wherein the die core assembly comprises a fixed die core frame and four circumferential die cores which are respectively arranged on a mounting plane on the same side of the fixed die core frame, and a fixed die core is also arranged on the fixed die core frame; the mold further comprises a movable mold core frame capable of being embedded into the fixed mold core frame for mold closing, a movable mold core is arranged on the movable mold core frame, and after the fixed mold core frame and the movable mold core frame are subjected to mold closing, a casting cavity is formed by closed spaces among the four circumferential mold cores, the fixed mold core and the movable mold core. According to the die-casting die core assembly, the defect that casting parts of the same type and different specifications cannot be produced due to the fact that a casting cavity of an existing die-casting die core assembly cannot be adjusted is overcome, when products of the same type and different specifications are produced, the space size of the casting cavity can be adjusted only by adjusting or replacing one or more die cores, and the production efficiency is improved. And the production requirements of production of different specifications of die-casting parts of the same type of products can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of casting molds, and more specifically to a mold core assembly and a universal mold frame of a die-casting mold. Background Art

[0002] Die casting mold is a tool for casting metal parts, a tool that completes the die casting process on a special die casting forging machine. The basic process of die casting is: the molten metal is first cast and filled into the casting cavity of the mold at a low speed or high speed, and then pressurized forging is performed as the molten metal cools down, which not only eliminates the shrinkage defects of the blank, but also makes the internal structure of the blank reach the broken grains of the forged state.

[0003] Die-casting molds are generally special tools that need to be developed and manufactured according to the external dimensions of the casting parts. Different specifications of casting parts need to be produced using different die-casting molds. However, in the actual production process, the same type of casting parts contain a variety of parts with different specifications, and the differences are only reflected in the changes in horizontal and vertical dimensions or local shapes. However, since the die-casting cavity formed by the core assembly of the existing die-casting mold is fixed, in the production of the same type of casting parts, only because there are slight differences in shape and size in the product specifications, it is necessary to re-develop and manufacture a new set of die-casting mold core assemblies, or manufacture a whole new set of die-casting molds. This is extremely costly for actual production and seriously affects the production cycle. Utility Model Content

[0004] The purpose of the utility model is to overcome the disadvantage that the casting cavity of the existing die-casting mold core assembly cannot be adjusted, resulting in the inability to produce casting parts of the same type with different specifications, and to provide a die-casting mold core assembly and a universal mold frame. When producing products of the same type with different specifications, the utility model only needs to adjust or replace one or more of the cores to adjust the space size of the casting cavity, so that the production needs of the production of die-casting parts of different specifications of the same type of product can be met without re-manufacturing the die-casting mold.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A die core assembly of a die casting mold, comprising a fixed die core frame, four circumferential die cores respectively mounted on a mounting plane on the same side of the fixed die core frame, the four circumferential die cores being arranged circumferentially and the side walls of the four circumferential die cores being abutted against each other, and the fixed die core frame being further provided with a fixed die core having one end inserted into a middle channel surrounded by the four circumferential die cores;

[0007] It also includes a movable mold core frame that can be embedded and molded with the fixed mold core frame, and a movable mold core is provided on the movable mold core frame. After the fixed mold core frame and the movable mold core frame are molded together, one end of the movable mold core is inserted into the middle channel surrounded by the four circumferential mold cores, and the enclosed space between the four circumferential mold cores, the fixed mold core and the movable mold core forms a casting cavity.

[0008] It should be noted that the mold core used to form the casting cavity in the utility model is composed of six independent mold cores, namely, six independent mold cores including the four circumferential mold cores, the fixed mold core and the movable mold core. After installation, each mold core forms six surfaces of the casting cavity respectively, wherein the space size of the casting cavity can be adjusted by adjusting the relative position of one or more of the mold cores, thereby meeting the production of similar casting parts of different specifications; since the mold core is an independent part, there is a huge casting pressure during the casting process. In order to ensure the die-casting stability of the casting cavity, a fixed mold core frame and a movable mold core frame are provided to adjust the six independent molds. The core is fixed to ensure the structural stability of the mold core during the die-casting process. After the six independent mold cores are respectively installed on the fixed mold core frame and the movable mold core frame, the fixed mold core frame and the movable mold core frame are molded and fixed to form a mold core assembly with an adjustable casting cavity size; when producing products of the same type but different specifications, only one or more of the mold cores need to be adjusted or replaced to adjust the spatial size of the casting cavity. In this way, without the need to re-manufacture the die-casting mold, the production needs of die-casting parts of different specifications of the same type of products can be met, thereby achieving high versatility and low cost of the die-casting mold, reducing production costs and improving production efficiency.

[0009] Furthermore, it also includes a core pulling mechanism, the number of which is 1 to 4, and the core pulling mechanism is respectively connected to and drives one or more of the four circumferential mold cores to perform core pulling movement.

[0010] Furthermore, each core pulling mechanism includes a mounting seat, a push rod passing through the mounting seat, one end of the push rod is connected to an external driving device, the other end of the push rod is connected to the circumferential mold core, and the mounting seat is installed on the fixed mold core frame.

[0011] It should be noted that a core pulling structure is added to connect one or more of the four circumferential cores respectively, and the method of adjusting the relative abutment position of the core can be achieved through the core pulling mechanism; on the other hand, due to the complex shape of die-cast parts, it is often necessary to set up active core pulling structures on all sides to complete demolding. Setting up the core pulling structure can also perform active core pulling on the core during the demolding process, reducing the difficulty of demolding.

[0012] Furthermore, a gate for injecting molten metal into the casting cavity is formed through the side wall of the fixed mold core frame, and a guide sliding mounting portion for core pulling activities of the four circumferential mold cores is provided around one side of the fixed mold core frame, and a fixed mold core mounting groove is also provided on the same side wall of the fixed mold core frame, and the fixed mold core is embedded in the fixed mold core mounting groove.

[0013] Furthermore, the guide sliding mounting portion includes columns arranged around the fixed mold core frame, and guide sliding portions for four circumferential mold cores to perform core pulling movements perpendicular to the casting mold surface are formed between adjacent columns. Notches are provided at the ends of the columns, and limiting pressure plate mounting portions are respectively formed between the notches of two adjacent columns. The limiting pressure plate mounting portions are installed by an external pressure plate to limit the four circumferential mold cores from escaping from the core pulling plane.

[0014] Furthermore, a movable mold core installation groove is provided on one side wall of the movable mold core frame, and the movable mold core is embedded in the movable mold core installation groove.

[0015] Furthermore, the fixed mold core frame and the movable mold core frame are respectively provided with lifting rings for lifting. Due to the volume and weight restrictions of the fixed mold core frame and the movable mold core frame, they are assembled by lifting, and the additional lifting rings facilitate lifting.

[0016] The utility model also provides a universal die frame of a die-casting mold, comprising a movable die frame and a fixed die frame, and also comprising a die core assembly of the die-casting mold as described above, wherein the movable die core frame is detachably connected to the movable die frame, and the fixed die core frame is detachably connected to the fixed die frame.

[0017] Furthermore, a side wall on which the fixed mold core frame is connected to the fixed mold frame is also provided with a positioning portion for clamping the fixed mold frame, and a first locking groove located on the same side wall as the positioning portion; the fixed mold frame is provided with an alignment portion for positioning and clamping with the positioning portion, and a second locking groove located on the same side as the alignment portion, and the first locking groove and the second locking groove are connected by a locking key after the positioning portion and the alignment portion are aligned and clamped. The fixed mold frame and the fixed mold core frame are aligned and guided by the positioning portion and the alignment portion, and locked and fixed by the locking key after the two are aligned and clamped, forming a fixed mold frame assembly.

[0018] Furthermore, a clamping portion for clamping the movable mold frame is provided on the side of the movable mold core frame, and a mounting groove for embedding the movable mold core frame is provided on the side wall where the movable mold frame is connected to the movable mold core frame, and a hydraulic clamp is provided in the mounting groove, and the hydraulic clamp clamps the clamping portion to realize the connection between the movable mold frame and the movable mold core frame. During installation, the movable mold core is embedded in the movable mold core mounting groove to form a fixed structure; the movable mold frame is clamped by the hydraulic clamp to realize the installation with the movable mold core frame, forming a movable mold frame assembly. For a universal mold frame, the fixed mold frame and the movable mold frame serve as the installation transition structure between the mold core assembly and the die-casting machine, and are the necessary installation components of the current common mold frame structure. The fixed mold frame realizes the intermediate connection between the fixed mold plate and the fixed mold core frame of the die-casting machine, and the movable mold frame realizes the intermediate connection between the movable mold plate and the movable mold core frame of the die-casting machine.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The mold core used for forming the casting cavity in the utility model is composed of six independent mold cores, namely, six independent mold cores including four circumferential mold cores, a fixed mold core and a movable mold core. After installation, each mold core forms six surfaces of the casting cavity respectively, wherein the spatial size of the casting cavity can be adjusted by adjusting the relative position of one or more of the mold cores, thereby satisfying the production of similar casting parts of different specifications; since the mold core is an independent part, there is huge casting pressure during the casting process. In order to ensure the die-casting stability of the casting cavity, a fixed mold core frame and a movable mold core frame are provided to fix the six independent mold cores to ensure the structural stability of the mold core during the die-casting process. After the six independent mold cores are respectively installed on the fixed mold core frame and the movable mold core frame, the fixed mold core frame and the movable mold core frame are molded and fixed to form a mold core assembly with an adjustable casting cavity size. When producing products of the same type but different specifications, the utility model only needs to adjust or replace one or more of the mold cores to adjust the space size of the casting cavity. In this way, without the need to remanufacture the die-casting mold, the production needs of die-casting parts of different specifications for the same type of products can be met, thereby achieving high versatility and low cost of the die-casting mold, reducing production costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the mold core assembly of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of one side of the fixed mold core frame in the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the movable mold core frame in the utility model;

[0024] Figure 4 It is an exploded view of the circumferential mold core, the movable mold core and the fixed mold core in the utility model;

[0025] Figure 5 It is a schematic diagram of the combined structure of the circumferential mold core, the movable mold core and the fixed mold core in the utility model;

[0026] Figure 6 It is a structural schematic diagram of the casting cavity in the utility model;

[0027] Figure 7 It is a schematic diagram of the structure in which the circumferential mold core and the fixed mold core are installed on the fixed mold core frame in the utility model;

[0028] Figure 8 This is a schematic diagram of the structure in which the movable mold core is installed on the movable mold core frame in the utility model;

[0029] Fig. 9 This is a schematic diagram of the structure of the fixed mold frame in the utility model;

[0030] Fig.10 This is a schematic diagram of the structure of the other side of the fixed mold core frame in the utility model;

[0031] Fig.11 This is a schematic diagram of the structure of the movable mold frame of the utility model;

[0032] Fig.12 This is a structural schematic diagram of the movable mold core frame installed on the movable mold frame in the utility model;

[0033] Fig.13 It is a structural schematic diagram of the utility model in which the middle mold core assembly is installed on the fixed mold frame.

[0034] The illustrations are as follows:

[0035] 1-fixed mold core frame, 11-circumferential mold core, 12-fixed mold core, 13-gate, 14-fixed mold core mounting groove, 15-column, 151-slide guide part, 152-limiting pressure plate mounting part, 16-positioning part, 2-movable mold core frame, 21-movable mold core, 22-movable mold core mounting groove, 25-clamping part, 3-casting cavity, 4-core pulling mechanism, 41-mounting seat, 42-push rod, 50-lifting ring, 7-movable mold frame, 71-mounting groove, 711-hydraulic clamp, 8-fixed mold frame, 81-alignment part, 82-second locking groove. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] Example 1

[0039] like Figures 1 to 8 As shown, this embodiment provides a die core assembly of a die casting mold, specifically comprising a fixed die core frame 1, four circumferential die cores 11 respectively mounted on the same side mounting plane of the fixed die core frame 1, the four circumferential die cores 11 are arranged in a surrounding manner and the side walls of the four circumferential die cores 11 abut against each other, and the fixed die core frame 1 is further provided with a fixed die core 12 having one end inserted in a middle channel surrounded by the four circumferential die cores 11;

[0040] It also includes a movable mold core frame 2 that can be embedded with the fixed mold core frame 1 for mold closing. The movable mold core frame 2 is provided with a movable mold core 21. After the fixed mold core frame 1 and the movable mold core frame 2 are molded together, one end of the movable mold core 21 is inserted into the middle channel surrounded by four circumferential mold cores 11, and the enclosed space between the four circumferential mold cores 11, the fixed mold core 12 and the movable mold core 21 forms a casting cavity 3.

[0041] like Figure 1 and Figure 7 As shown, it also includes a core pulling mechanism 4, the number of which is 1 to 4. The core pulling mechanisms 4 are respectively connected to and drive one or more of the four circumferential mold cores 11 to perform core pulling movements.

[0042] like Figure 7 As shown, each core pulling mechanism 4 includes a mounting seat 41, a push rod 42 passing through the mounting seat 41, one end of the push rod 42 is connected to an external driving device, and the other end of the push rod 42 is connected to the circumferential mold core 11, and the mounting seat 41 is installed on the fixed mold core frame 1.

[0043] It should be noted that a core pulling structure is added to connect one or more of the four circumferential cores 11 respectively, and the method of adjusting the relative abutment position of the core can be achieved through the core pulling mechanism 4; on the other hand, due to the complex shape of die-cast parts, it is often necessary to set up active core pulling structures on all sides to complete demolding. Setting up a core pulling structure can also perform active core pulling on the core during the demolding process, reducing the difficulty of demolding.

[0044] like Figure 2 As shown, a gate 13 for injecting molten metal into the casting cavity 3 is formed through the side wall of the fixed mold core frame 1, and a guide sliding mounting portion for core pulling activities of four circumferential mold cores 11 is provided around one side of the fixed mold core frame 1. A fixed mold core mounting groove 14 is also provided on the same side wall of the fixed mold core frame 1, and the fixed mold core 12 is embedded in the fixed mold core mounting groove 14.

[0045] like Figure 2 As shown, the guide sliding installation part includes columns 15 arranged around the fixed mold core frame 1, and a guide sliding part 151 for core pulling movement of four circumferential mold cores 11 perpendicular to the casting surface is formed between adjacent columns 15. A slot is opened at the end of the column 15, and a limiting pressure plate installation part 152 is formed between the slots of two adjacent columns 15. The limiting pressure plate installation part 152 is installed by an external pressure plate to limit the four circumferential mold cores 11 from escaping from the core pulling plane.

[0046] like Figure 3 As shown, a movable mold core installation groove 22 is opened on one side wall of the movable mold core frame 2, and the movable mold core 21 is embedded in the movable mold core installation groove 22.

[0047] The advantages of this embodiment are as follows: the mold core used to form the casting cavity 3 in this embodiment is composed of six independent mold cores, namely, four circumferential mold cores 11, a fixed mold core 12 and a movable mold core 21. After installation, each mold core forms six surfaces of the casting cavity 3 respectively, wherein the space size of the casting cavity 3 can be adjusted by adjusting the relative position of one or more of the mold cores, thereby meeting the production of similar casting parts of different specifications; since the mold core is an independent part, there is a huge casting pressure during the casting process. In order to ensure the die-casting stability of the casting cavity 3, a fixed mold core frame 1 and a movable mold core frame 2 are provided to adjust the six surfaces of the casting cavity 3. The independent mold cores are fixed to ensure the structural stability of the mold core during the die-casting process. After the six independent mold cores are respectively installed on the fixed mold core frame 1 and the movable mold core frame 2, the fixed mold core frame 1 and the movable mold core frame 2 are molded and fixed to form a mold core assembly with an adjustable casting cavity 3 size; when producing products of the same type but different specifications, only one or more of the mold cores need to be adjusted or replaced to adjust the spatial size of the casting cavity 3. In this way, without the need to re-manufacture the die-casting mold, the production needs of the production of die-casting parts of different specifications of the same type of products can be met, thereby achieving high versatility and low cost of the die-casting mold, reducing production costs and improving production efficiency.

[0048] Example 2

[0049] This embodiment is similar to Embodiment 1, except that, in this embodiment:

[0050] like Figure 8As shown, the fixed mold core frame 1 and the movable mold core frame 2 are also provided with lifting rings 50 for lifting. Due to the volume and weight restrictions of the fixed mold core frame 1 and the movable mold core frame 2, they are assembled by lifting, and the lifting rings 50 are added to facilitate lifting.

[0051] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0052] Example 3

[0053] like Figures 9 to 13 As shown, this embodiment provides a universal mold frame for a die-casting mold, including a movable mold frame 7 and a fixed mold frame 8, and also includes a core assembly of the die-casting mold as described in the above embodiment, wherein the movable mold core frame 2 is detachably connected to the movable mold frame 7, and the fixed mold core frame 1 is detachably connected to the fixed mold frame 8.

[0054] like Fig. 9 and Fig.10 As shown, the side wall on which the fixed mold core frame 1 is connected to the fixed mold frame 8 is also provided with a positioning portion 16 for clamping the fixed mold frame 8, and a first locking groove 17 located on the same side wall as the positioning portion 16; the fixed mold frame 8 is provided with an alignment portion 81 for positioning and clamping with the positioning portion 16, and a second locking groove 82 located on the same side as the alignment portion 81, and the first locking groove 17 and the second locking groove 82 are connected by a locking key after the positioning portion 16 and the alignment portion 81 are aligned and clamped. The fixed mold frame 8 and the fixed mold core frame 1 are aligned and guided by the positioning portion 16 and the alignment portion 81, and are locked and fixed by the locking key after the two are aligned and clamped, forming the fixed mold frame 8 assembly.

[0055] like Fig.11 and Fig.12 As shown, a clamping portion 25 for clamping the movable mold frame 7 is also provided on the side of the movable mold core frame 2, and a mounting groove 71 for embedding the movable mold core frame 2 is provided on the side wall where the movable mold frame 7 is connected to the movable mold core frame 2. A hydraulic clamp 711 is provided in the mounting groove 71, and the hydraulic clamp 711 clamps the clamping portion 25 to realize the connection between the movable mold frame 7 and the movable mold core frame 2. During installation, the movable mold core 21 is embedded in the movable mold core mounting groove 22 to be fixed; the movable mold frame 7 is installed with the movable mold core frame 2 by clamping the clamping portion 25 through the hydraulic clamp 711, forming the movable mold frame 7 assembly.

[0056] For the universal mold frame, the fixed mold frame 8 and the movable mold frame 7 serve as the installation and connection structure between the mold core assembly and the die-casting machine, and are the necessary installation components of the current shared mold frame structure. The fixed mold frame 8 realizes the intermediate connection between the fixed mold plate and the fixed mold core frame 1 of the die-casting machine, and the movable mold frame 7 realizes the intermediate connection between the movable mold plate and the movable mold core frame 2 of the die-casting machine.

[0057] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A die-casting mold core assembly, characterized in that: The fixed mold core frame (1) comprises four circumferential mold cores (11) respectively mounted on a mounting plane on the same side of the fixed mold core frame (1), the four circumferential mold cores (11) being arranged in a surrounding manner and the side walls of the four circumferential mold cores (11) being in contact with each other, and the fixed mold core frame (1) is also provided with a fixed mold core (12) having one end inserted into a middle channel surrounded by the four circumferential mold cores (11); It also comprises a movable mold core frame (2) which can be embedded with the fixed mold core frame (1) for mold closing, and a movable mold core (21) is provided on the movable mold core frame (2). After the fixed mold core frame (1) and the movable mold core frame (2) are molded together, one end of the movable mold core (21) is inserted into the middle channel surrounded by the four circumferential mold cores (11), and the enclosed space between the four circumferential mold cores (11), the fixed mold core (12) and the movable mold core (21) forms a casting cavity (3).

2. The die-casting mold core assembly according to claim 1, characterized in that: It also comprises a core pulling mechanism (4), the number of the core pulling mechanisms (4) being 1 to 4, and the core pulling mechanisms (4) respectively connecting to and driving one or more of the four circumferential mold cores (11) to perform core pulling movement.

3. The die-casting mold core assembly according to claim 2, characterized in that: Each core pulling mechanism (4) comprises a mounting seat (41), a push rod (42) passing through the mounting seat (41), one end of the push rod (42) being connected to an external driving device, and the other end of the push rod (42) being connected to the circumferential mold core (11), and the mounting seat (41) being mounted on the fixed mold core frame (1).

4. The die-casting mold core assembly according to claim 1, characterized in that: A gate (13) for injecting molten metal into the casting cavity (3) is provided through the side wall of the fixed mold core frame (1); a guide slide mounting portion for core pulling activities of the four circumferential mold cores (11) is provided around one side of the fixed mold core frame (1); a fixed mold core mounting groove (14) is also provided on the same side wall of the fixed mold core frame (1); and the fixed mold core (12) is embedded in the fixed mold core mounting groove (14).

5. The die-casting mold core assembly according to claim 4, characterized in that: The guide slide mounting portion comprises columns (15) arranged around the fixed mold core frame (1), and between adjacent columns (15) are formed guide slide portions (151) for the four circumferential mold cores (11) to perform core pulling movements perpendicular to the casting mold surface. The ends of the columns (15) are provided with notches, and between the notches of two adjacent columns (15) are respectively formed limiting pressure plate mounting portions (152), and the limiting pressure plate mounting portions (152) are installed by means of an external pressure plate to limit the four circumferential mold cores (11) from coming out of the core pulling plane.

6. The die-casting mold core assembly according to claim 1, characterized in that: A movable mold core installation groove (22) is provided on one side wall of the movable mold core frame (2), and the movable mold core (21) is embedded in the movable mold core installation groove (22).

7. The die-casting mold core assembly according to claim 1, characterized in that: The fixed mold core frame (1) and the movable mold core frame (2) are also respectively provided with lifting rings (50) for lifting.

8. A universal die frame for a die casting mold, comprising a movable die frame (7) and a fixed die frame (8), characterized in that: It also comprises a die core assembly of the die casting mold according to any one of claims 1 to 7, wherein the movable die core frame (2) is detachably connected to the movable die frame (7), and the fixed die core frame (1) is detachably connected to the fixed die frame (8).

9. A universal die frame for a die-casting mold according to claim 8, characterized in that: A side wall on which the fixed mold core frame (1) is connected to the fixed mold frame (8) is also provided with a positioning portion (16) for clamping the fixed mold frame (8), and a first locking groove (17) located on the same side wall as the positioning portion (16); the fixed mold frame (8) is provided with an alignment portion (81) for positioning and clamping the positioning portion (16), and a second locking groove (82) located on the same side as the alignment portion (81); the first locking groove (17) and the second locking groove (82) are connected via a locking key after the positioning portion (16) and the alignment portion (81) are aligned and clamped.

10. The universal die frame of a die-casting mold according to claim 8, characterized in that: A clamping portion (25) for clamping the movable mold frame (7) is also provided on the side of the movable mold core frame (2); a side wall on which the movable mold frame (7) is connected to the movable mold core frame (2) is provided with a mounting groove (71) for embedding the movable mold core frame (2); a hydraulic clamp (711) is provided in the mounting groove (71); the hydraulic clamp (711) clamps the clamping portion (25) to achieve the connection between the movable mold frame (7) and the movable mold core frame (2).

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