High-precision wax pattern forming die for casting with complex structure

Abstract

The invention relates to the technical field of casting molds, in particular to a high-precision wax mold forming mold for a complex-structure casting, which comprises a first outer mold, a second outer mold, a bottom mold and a top mold, a first inner module and a second inner module are arranged in the first cavity; the parting surface of the second outer mold and the first outer mold is arranged along the side part of the outer arc surface of the lower bracket of the air bag; the bottom die is connected with the first outer die and the second outer die in a clamped mode, a first through hole is formed in the bottom die, a first inserting rod is inserted into the first through hole, and the first inserting rod penetrates through the bottom die to be connected with first blind holes in the bottoms of the first inner die block and the second inner die block in an inserted mode. And the top die is matched with the end parts of the first inner die block, the second inner die block and the second outer die. Through reasonable design of the wax mold structure, one-time integral forming of the air bag lower support of a complex structure is achieved, meanwhile, smooth demolding of a wax mold is guaranteed, and the wax mold forming efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting molds, in particular to a high-precision wax mold forming mold for castings with complex structures. Background Art

[0002] Investment casting (also known as lost wax casting), a casting method that uses precise molding techniques to produce accurate castings, is widely used in mass production of castings due to its advantages such as strong near-net-shape capabilities, high dimensional accuracy, and excellent surface quality. The core process of this casting process includes wax pattern making, shell coating, dewaxing, firing, and pouring. The quality of the wax pattern directly determines the dimensional accuracy and surface integrity of the final casting, and the molding quality of the wax pattern is highly dependent on the design and performance of the molding tool.

[0003] The airbag lower bracket is an essential and critical load-bearing component of an automobile air suspension, primarily used to support the shock-absorbing airbag and transfer loads, as shown in CN203126440U, a passenger car air suspension lower bracket. Due to the need to simultaneously achieve precise connection with multiple components, including the vehicle body frame and airbag initiator, its structure presents significant complexity: it includes an arc-shaped connecting arm, the lower portion of which is integrated with multiple reinforcing ribs and connection holes, and a base at the bottom of the connecting arm, which is provided with connection holes and weight-reducing grooves. This type of complex structural casting has high requirements for dimensional accuracy and structural integrity, and its manufacturing process has become a critical link in ensuring the safety performance of the vehicle.

[0004] Currently, for complex castings like the airbag lower bracket, traditional wax pattern production typically uses a split-molding process: the complex wax model is broken down into several simple submodules, each manufactured separately, and then assembled into a whole through bonding and welding. This method has significant drawbacks. First, the joints between the submodules are prone to dimensional deviations, seam marks, or weak areas, leading to defects in subsequent mold shell preparation and casting. Second, it increases the complexity and labor costs of wax pattern production, reduces production efficiency, and makes it difficult to meet the consistency requirements of high-precision castings.

[0005] Therefore, for automotive castings with complex structures such as the airbag lower bracket, developing a special mold that can achieve one-time integral molding of the wax pattern and smoothly demolding is of great significance for improving the stability of the investment casting process, reducing production costs, and ensuring the manufacturing accuracy of automotive safety components. Summary of the Invention

[0006] The purpose of the present invention is to address the shortcomings of the existing technology and provide a high-precision wax mold forming mold for complex structure castings, which can realize the one-time integral forming of the airbag lower bracket wax mold, facilitate the demolding of the wax mold, reduce production costs, and improve the quality of the airbag lower bracket casting.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a high-precision wax mold forming mold for complex structure castings, comprising a first outer mold, a second outer mold, a bottom mold and a top mold; The first outer mold is provided with a first cavity for forming the inner structure of the lower support of the airbag, and the first inner mold block and the second inner mold block are provided inside the first cavity for forming the groove structure between the double arc surfaces of the connecting arm; A second outer mold is provided with a second mold cavity for molding the outer structure of the lower airbag support, the second outer mold and the first outer mold are combined to form a parting surface, and the parting surface is provided along the side of the outer arc surface of the lower airbag support; A bottom mold is used to form the bottom structure of the base of the lower bracket of the airbag, and is fixed to the bottom of the first outer mold and the second outer mold through the slots of the first outer mold and the second outer mold. The bottom mold is provided with a first through hole corresponding to the base connection hole, and a first insertion rod is inserted into the first through hole. The first insertion rod passes through the bottom mold and is inserted into the first blind hole at the bottom of the first inner module and the second inner module; The top mold is used to form the end structure of the connecting arm of the lower bracket of the airbag. After the first outer mold and the second outer mold are closed, the top mold cooperates with the ends of the first inner module, the second inner module and the second outer mold.

[0008] Furthermore, the second outer mold includes a lower outer mold for molding the lower portion of the connecting arm and an upper outer mold for molding the upper portion of the connecting arm, which is conducive to multi-directional demoulding of the outer structure of the lower support of the airbag.

[0009] Furthermore, the first outer mold, the second outer mold and the first inner module are provided with a plurality of second through holes, and a second insertion rod is inserted into the second through hole, so that the connecting hole of the connecting section of the lower bracket of the airbag is preformed by the second insertion rod, and the first inner module in the mold cavity is fixed by the second insertion rod.

[0010] Furthermore, the top mold is internally provided with a top mold inner module. This module comprises a column for forming the through-hole for the connecting ear of the lower airbag bracket and a top mold inner module body for forming the bottom structure of the connecting ear. By snapping or embedding the top mold inner module structure into the top mold, the inclined hole of the connecting ear is preformed. The top mold and the second outer mold (i.e., the upper outer mold) are each provided with a semicircular groove. When the top mold and the second outer mold are combined, the two semicircular grooves form a circular groove for securing the end of the column. The top mold inner module body is snapped into the top mold to secure the top mold inner module.

[0011] Furthermore, after the first inner module and the second inner module are inserted into the first mold cavity, the ends of the first inner module and the second inner module protrude from the first outer mold, and the top mold is clamped with the first outer mold and the second outer mold through the protruding parts of the first inner module and the second inner module. The first inner module and the second inner module are positioned and fixed through the first socket, and the top mold is accurately positioned and fixed by the protruding parts of the first inner module and the second inner module, which is conducive to ensuring the clamping accuracy of each module.

[0012] Furthermore, the first inner module and the second inner module include a molding part and a connecting part, the connecting part is in contact and connected with the first outer mold, the second outer mold and the top mold, and the molding part forms a wax model cavity with the first outer mold, the second outer mold and the top mold, which is convenient for strengthening the fixation of the first inner module and the second inner module, and at the same time facilitates the fixation of the upper outer mold and the top mold, thereby ensuring the mold closing accuracy.

[0013] Furthermore, the connecting portion of the first inner module and the second inner module is provided with a protrusion or a groove, and the top mold is correspondingly provided with a groove or a protrusion, which can improve the matching accuracy of the top mold with the first inner module and the second inner module, thereby ensuring the mold closing accuracy of the first outer mold, the second inner module, the top mold and the second outer mold, especially the upper outer mold, through matching with the first inner module and the second inner module.

[0014] Furthermore, the end of the second outer mold (i.e., the upper outer mold) is provided with a positioning hole or a positioning column, and the top mold is provided with a positioning column or a positioning hole. The positioning column is inserted into the positioning hole. After the mold is closed, the connection and fixation between the top mold and the first outer mold and the second outer mold can be strengthened.

[0015] Furthermore, a third inner module and a fourth inner module are provided inside the first outer mold for forming the shock absorber connecting portion of the airbag lower bracket and the connecting hole at the portion.

[0016] Furthermore, after the first outer mold and the lower outer mold are closed, a gap is provided between the top of the lower outer mold and the first outer mold. After closing the mold, the lower part of the upper mold is located in the gap and contacts with the lower outer mold, so as to strengthen the support and fixation of the upper outer mold.

[0017] The beneficial effects of the present invention are: 1. The present invention adopts a design of parting surface and multi-module coordinated positioning, where the parting surface of the first cavity and the second cavity is arranged along the side of the outer arc surface of the airbag lower bracket. Combined with the plug-in structure of the first insert rod penetrating the through hole of the bottom mold and the blind holes of the first inner module and the second inner module, this not only achieves the precise molding of the double-arc connecting arm, but also completes the pre-forming of the base connecting hole and the fixation and positioning of the first inner module and the second inner module through the first insert rod, thus solving the problem of coordinated fixation of complex cavity modules. 2. In the present invention, the groove between the double arc surfaces of the arc-shaped connecting arm is formed by the first inner module and the second inner module, and the first inner module and the second inner module are fixed by the first plug rod and the second plug rod. In this way, not only the connection hole of the casting is formed in advance, but also the stable connection between the first inner module and the second inner module is ensured. In addition, through the multi-dimensional plug-in structure of the first inner module, the first plug rod and the second plug rod, combined with the mutual cooperation between the top mold and the first inner module and the second inner module, not only the stability of the second inner module is enhanced and its positioning accuracy is ensured, but also the fixation and positioning of the top mold and the upper outer mold are achieved, thereby ensuring the precise positioning of each module in the mold and improving the quality of wax mold molding; 3. The second outer mold adopts a combined design of a lower outer mold (forming the lower part of the connecting arm) and an upper outer mold (forming the upper part of the arc-shaped connecting arm). When demolding, the upper outer mold can be separated first and then the lower outer mold. This avoids the pulling damage to the connection between the arc contour and the connecting section caused by the traditional integral outer mold, and realizes non-destructive demolding of complex curved wax models. 4. The present invention realizes the one-time integral molding of the complex structure of the airbag lower bracket through the reasonable design of the wax mold structure, while also ensuring the smooth demolding of the wax mold, improving the efficiency and quality of wax mold molding, and solving the technical difficulties in wax mold molding of complex castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the casting of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the present invention.

[0020] Figure 3 It is a partial structural schematic diagram of the present invention.

[0021] Figure 4 yes Figure 3 main view.

[0022] Figure 5 This is a top view after removing the upper mold and outer mold.

[0023] Figure 6 It is a structural diagram of the internal modules of the present invention.

[0024] Description of reference numerals: 1—first outer mold, 11—first inner module, 12—second inner module, 13—first blind hole, 14—third inner module, 15—fourth inner module, 2—second outer mold, 21—lower outer mold, 22—upper outer mold, 3—bottom mold, 31—first through hole, 4—top mold, 41—top mold inner module, 411—column, 412—top mold inner module body, 5—lower airbag bracket, 51—connecting arm, 52—base, 53—connecting ear, 6—first insertion rod, 7—second through hole, 8—second insertion rod. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] like Figures 1 to 6As shown, a wax mold forming mold for an airbag lower bracket of the present embodiment includes a first outer mold 1, a second outer mold 2, a bottom mold 3 and a top mold 4; the first outer mold 1 and / or the second outer mold 2 are provided with a wax injection port; the first outer mold 1 is provided with a first cavity for forming the inner structure of the airbag lower bracket 5, and the second outer mold 2 is provided with a second cavity for forming the outer structure of the airbag lower bracket 5, the inner side of the airbag lower bracket 5 refers to the inner side of the arc of the connecting arm 51 of the airbag lower bracket 5, and the outer side refers to the outer side of the arc of the connecting arm 51; the connecting arm of the airbag lower bracket 5 51 is a double-arc surface structure, including an inner arc surface located on the inner side and an outer arc surface located on the outer side. The parting surface of the first outer mold 1 and the second outer mold 2 is arranged along the side of the outer arc surface of the connecting arm 51 of the lower airbag bracket 5; the first inner module 11 and the second inner module 12 are arranged inside the first cavity, and the first inner module 11 and the second inner module 12 are used to form the groove structure between the double-arc surfaces of the connecting arm 51 of the lower airbag bracket 5. The first blind hole 13 is arranged at the bottom of the first inner module 11 and the second inner module 12, and the first blind hole 13 is coaxial with the first through hole 31. The bottom mold 3 is used to form the bottom structure of the base 52 of the lower airbag bracket 5. The bottoms of the first outer mold 1 and the second outer mold 2 are provided with card slots for fixing the bottom mold 3. The bottom mold 3 is provided with a plurality of first through holes 31. The first through holes 31 are arranged corresponding to the connecting holes of the base 52 of the lower airbag bracket 5. A first insertion rod 6 is inserted into the first through hole 31; the first insertion rod 6 passes through the first through hole 31 and is inserted into the first blind hole 13. The first insertion rod 6 can be used to form the connecting hole of the base 52 of the lower airbag bracket 5. Through the connecting hole, the subsequent processing of the connecting hole of the base 52 is facilitated; in addition, after the first insertion rod 6 is inserted into the first blind hole 13, the positioning and fixation of the first inner module 11 and the second inner module 12 in the first cavity can be realized. The top mold 4 is used to form the end structure of the connecting arm 51 of the airbag lower bracket 5, such as the connecting ear 53 structure and part of the inner structure of the connecting arm 51. After the first outer mold 1 and the second outer mold 2 are closed, the ends of the first inner module 11 and the second inner module 12 protrude from the ends of the first outer mold 1 and the second outer mold 2. The top mold 4 cooperates with the protruding parts of the first inner module 11 and the second inner module 12, and the positioning and fixation of the top mold 4 are achieved through the protruding parts of the first inner module 11 and the second inner module 12, thereby strengthening the tightness of the connection between the top mold 4 and the first outer mold 1 and the second outer mold 2.

[0029] The second outer mold 2 includes a lower outer mold 21 for forming the lower part of the connecting arm 51 of the lower airbag bracket 5 and an upper outer mold 22 for forming the upper part of the connecting arm 51. The lower outer mold 21 is provided with a lower cavity, and the upper outer mold 22 is provided with an upper cavity. The upper cavity and the lower cavity together form the second cavity of the second outer mold 2; the second outer mold 2 on the arc-shaped outer side of the connecting arm 51 of the lower airbag bracket 5 is divided into two sections, which is conducive to the multi-directional demolding of the outer structure of the lower airbag bracket 5. For example, when demolding, the upper outer mold 22 of the bending area of ​​the arc-shaped connecting arm 51 can be detached first, and then the lower outer mold 21 of the lower part of the connecting arm can be pulled out as a whole to ensure the integrity of the arc contour of the wax mold and the connection between the connecting section, which is conducive to the one-time integral molding of the wax mold.

[0030] The first outer mold 1, the second outer mold 2 and the first inner module 11 are provided with a plurality of second through holes 7, and the second insertion rods 8 are inserted into the second through holes 7. After the second insertion rods 8 are inserted into the first outer mold 1, the second outer mold 2 and the first inner module 11, a connecting hole at the lower part of the connecting arm 51 of the lower airbag bracket 5 can be formed. Through the connecting hole, the subsequent processing of the connecting hole at the lower part of the connecting arm 51 is facilitated. In addition, the first inner module 11 is provided with the second through holes 7, which can be plugged into the second through holes 7 in the first inner module 11 by the second insertion rods 8, thereby realizing the positioning and fixation of the first inner module 11 in the first cavity. Among them, the first inner module 11 includes a first inner module A and a first inner module B. The first inner module A is used to form the boss of the connecting hole of the connecting section. The first inner module includes the first inner module A and the first inner module B to facilitate the demolding of the first inner module 11.

[0031] The top mold 4 is internally provided with a top mold inner module 41. Since the through-hole of the connecting ear 53 is arranged at a certain angle to the vertical plane, and the plane on which the connecting ear 53 is located is arranged at a certain angle to the horizontal plane, the structure and angle of the connecting ear 53, as well as the through-hole of the connecting ear 53, are formed by the top mold inner module 41. A column 411 for forming the through-hole is provided at one end of the top mold inner module 41, and a top mold inner module body 412 is provided at the other end. When the top mold inner module body 412 is inserted into the top mold 4, it forms a cavity for the inner structure of the connecting arm 51 together with the first outer mold 1. Semicircular grooves are respectively provided in the top mold 4 and the second outer mold 2 (i.e., the upper outer mold 22). After the top mold 4 and the second outer mold 2 are closed, the top mold inner module body 412 is engaged with the top mold 4, and the two semicircular grooves form a circular groove for fixing the end of the column 411.

[0032] The first inner module 11 and the second inner module 12 include a molding part and a connecting part. The molding part is used to form a molding cavity of the wax mold with the first outer mold 1, the second outer mold 2 and the top mold 4. The connecting part is used to contact and connect with the first outer mold 1, the upper outer mold 22, the lower outer mold 21 and the top mold 4. Through the contact between the connecting part and each mold, the accuracy of the first inner module 11 and the second inner module 12 in the first cavity can be enhanced, and the positioning and support of the top mold 4 and the upper outer mold 22 can be achieved through the connecting part, thereby ensuring the mold closing accuracy of each mold.

[0033] The ends of the connecting portions of the first inner module 11 and the second inner module 12 are provided with protrusions or grooves, and the top mold 4 is provided with grooves or protrusions that cooperate with the protrusions or grooves. Because the first inner module 11 and the second inner module 12 are positioned and fixed within the first mold cavity under the action of the first insertion rod 6 at the bottom, the top mold 4 cooperates with the first inner module 11 and the second inner module 12 to facilitate accurate positioning of the top mold 4, thereby facilitating the accuracy of the one-time integrally formed wax mold.

[0034] The end of the second outer mold 2 (i.e., the upper outer mold 22) is provided with a positioning hole or a positioning post, and the top mold 4 is provided with a positioning post or a positioning hole. The positioning post is inserted into the positioning hole, which can strengthen the connection and fixation between the top mold 4 and the first and second outer molds 1 and 2 after the mold is closed. Because the first inner mold 11 and the second inner mold 12 ensure the mold closing accuracy of the top mold 4, the positioning post and positioning hole matching between the top mold 4 and the upper outer mold 22 not only facilitates the fixation of the top mold 4, but also further ensures the mold closing accuracy of the upper outer mold 22.

[0035] A third inner module 14 and a fourth inner module 15 are provided inside the first outer mold 1 , and the third inner module 14 and the fourth inner module 15 are snapped into or embedded in the first outer mold 1 to form the shock absorber connection part of the airbag lower bracket 5 and the connection hole at this part.

[0036] After the first outer mold 1 and the lower outer mold 21 are closed, a gap is set between the top of the lower outer mold 21 and the first outer mold 1. When the molds are closed, the lower part of the upper outer mold 22 is located in the gap. The upper outer mold 22 is auxiliary supported by the lower outer mold 21, which is conducive to strengthening the support and fixation of the upper outer mold 22.

[0037] The working principle of the present invention is as follows: the third inner module 14 and the fourth inner module 15 are embedded in the first outer mold 1, the bottom mold 3 is inserted into the bottom slots of the first outer mold 1 and the lower outer mold 21, the first insertion rod 6 passes through the bottom mold 3 and is plugged into the first inner module 11 and the second inner module 12, and the second insertion rod 8 passes through the lower outer mold 21, the first inner module 11, and the second through hole 7 of the first outer mold 1 to achieve the positioning and fixation of the first inner module 11 and the second inner module 12 between the first outer mold 1 and the lower outer mold 21; the top mold 4 cooperates with the protrusions of the first inner module 11 and the second inner module 12 and with the positioning column-hole of the upper outer mold 22, finally achieving the closing of the first outer mold 1, the upper outer mold 22, the lower outer mold 21, the bottom mold 3, and the top mold 4. After the molds are closed, a complete cavity of the airbag lower bracket 5 is formed, and wax filling is achieved through the wax injection port of the first outer mold 1 or the second outer mold 2. When demoulding, the top mold 4, the upper outer mold 22, the first insert rod 6, the second insert rod 8, the lower outer mold 21 and the first outer mold 1 are pulled out respectively to realize the demoulding operation. The above demoulding operation sequence is not fixed and can be adjusted according to actual operation.

[0038] The present invention realizes the one-time integral molding of the complex structure of the airbag lower bracket 5 through the reasonable design of the wax mold structure, and also ensures the smooth demoulding of the wax mold, improves the efficiency and quality of wax mold molding, and solves the technical difficulties of wax mold molding of complex castings.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-precision wax mold for complex structure castings, characterized by: It comprises a first outer mold (1), a second outer mold (2), a bottom mold (3) and a top mold (4); A first outer mold (1) is provided with a first cavity for forming the inner structure of the airbag lower bracket (5), wherein a first inner mold block (11) and a second inner mold block (12) are provided in the first cavity for forming the groove structure between the double arc surfaces of the connecting arm (51) of the airbag lower bracket (5); A second outer mold (2) is provided with a second mold cavity for molding the outer structure of the airbag lower bracket (5), and a parting surface between the second outer mold (2) and the first outer mold (1) is provided along the side of the outer arc surface of the connecting arm (51); A bottom mold (3) is used to form the bottom structure of the base (52) of the lower support (5) of the airbag, and is fixed to the bottom of the first outer mold (1) and the second outer mold (2) through the slots of the first outer mold (1) and the second outer mold (2), the bottom mold (3) is provided with a first through hole (31) corresponding to the connecting hole of the base (52), a first insertion rod (6) is inserted into the first through hole (31), and the first insertion rod (6) passes through the bottom mold (3) and is inserted into the first blind hole (13) at the bottom of the first inner module (11) and the second inner module (12); The top mold (4) is used to form the end structure of the connecting arm (51). After being molded together with the first outer mold (1) and the second outer mold (2), the top mold (4) cooperates with the ends of the first inner mold (11), the second inner mold (12) and the second outer mold (2).

2. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: The second outer mold (2) comprises a lower outer mold (21) for molding the lower part of the connecting arm (51) and an upper outer mold (22) for molding the upper part of the connecting arm (51).

3. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: The first outer mold (1), the second outer mold (2) and the first inner mold block (11) are provided with a plurality of second through holes (7), and second insertion rods (8) are inserted into the second through holes (7).

4. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: A top mold inner module (41) is provided inside the top mold (4), and the top mold inner module (41) includes a column (411) with a through hole for forming the connecting ear (53) of the airbag lower bracket (5) and a top mold inner module body (412) for forming the bottom structure of the connecting ear (53). The top mold (4) and the second outer mold (2) are respectively provided with a semicircular groove for fixing the end of the column (411), and the top mold inner module body (412) is clamped with the top mold (4).

5. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: After the first inner module (11) and the second inner module (12) are inserted into the first cavity, the ends of the first inner module (11) and the second inner module (12) protrude from the first outer mold (1), and the top mold (4) is molded together with the first outer mold (1) and the second outer mold (2) via the protruding portions of the first inner module (11) and the second inner module (12).

6. The high-precision wax mold for complex structure castings according to claim 5, characterized in that: The first inner module (11) and the second inner module (12) comprise a molding portion and a connecting portion, wherein the connecting portion is in contact with and connected to the first outer mold (1), the second outer mold (2) and the top mold (4), and the molding portion forms a wax model cavity with the first outer mold (1), the second outer mold (2) and the top mold (4).

7. The high-precision wax mold for complex structure castings according to claim 6, characterized in that: The connecting portion of the first inner module (11) and the second inner module (12) is provided with a protrusion or a groove, and the top mold (4) is correspondingly provided with a groove or a protrusion.

8. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: The end of the second outer mold (2) is provided with a positioning hole or a positioning column, and the top mold (4) is provided with a positioning column or a positioning hole.

9. The high-precision wax mold for complex structure castings according to claim 1, characterized in that: A third inner module (14) and a fourth inner module (15) are provided inside the first outer mold (1) for forming a shock absorber connection portion of the airbag lower bracket (5) and a connection hole at the portion.

10. The high-precision wax mold for complex structure castings according to claim 2, characterized in that: After the first outer mold (1) and the lower outer mold (21) are closed, a gap is provided between the top of the lower outer mold (21) and the first outer mold (1), and the bottom of the upper outer mold (22) is located in the gap and in contact with the lower outer mold (21).

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