A method for processing a crossbeam bracket of an automobile instrument panel through a processing mold of the crossbeam bracket

Abstract

The present invention belongs to the technical field of automobile processing equipment, and particularly refers to a method for processing a beam bracket through a processing mold of a cross beam bracket of an automobile instrument panel, comprising an upper template and a lower template, the cross beam bracket comprising a sheet metal main cross beam and a wrapped plastic shell, the cross section of the sheet metal main cross beam presents a C-shaped or U-shaped structure with the opening facing downward, a limiting boss is provided on the lower template, a pre-stressing convex column is provided on the upper template, the outer wall surface of the sheet metal main cross beam has an open portion and a wrapped portion, the open portion can be respectively attached and abutted against the cavity wall surfaces of the upper template and the lower template, and the area of ​​the wrapped portion is smaller than the area of ​​the open portion. The present invention reasonably optimizes the matching structure of the sheet metal main cross beam and the injection mold, and before the mold is closed, the pre-stressing convex column abuts against the sheet metal main cross beam to achieve the purpose of pre-stressing and preventing displacement, and after the mold is closed, the open portion occupying a larger area in the sheet metal main cross beam will be clamped and clamped by the upper template and the lower template to effectively prevent the sheet metal main cross beam from bending and deforming due to heat.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile processing equipment, and in particular relates to a method for processing a crossbeam bracket of an automobile instrument panel through a processing mold of the crossbeam bracket. Background Art

[0002] The existing Chinese invention patent application (application publication number CN115476935A) discloses a sheet metal embedded injection molding structure of a cross beam bracket of an automobile instrument panel, which includes a main bracket, the main bracket includes a sheet metal main cross beam, a longitudinal connector and a vertical connector, the longitudinal connector and the vertical connector are both plastic parts, and the sheet metal main cross beam is placed in the mold as an insert to form the main bracket by integral injection molding. That is, in order to meet the strength requirements, the sheet metal main cross beam is placed in the mold as an insert for integral injection molding, which integrates more than a dozen traditional parts to form a product, greatly reducing costs and shortening the product processing cycle.

[0003] However, the above structure has not been effectively promoted and applied in the current market. The key problem is that the structural design has significantly increased the requirements for the injection molding process. This is because the length of the crossbeam bracket of the automobile dashboard is more than 1600mm. Correspondingly, the length of the main crossbeam of the sheet metal that needs to be inserted into the mold as an insert must be at least 1400mm. The main crossbeam of such length is in contact with the molten injection molding material in the mold. When it is heated, it bends and deforms to a large extent and is difficult to control, resulting in a low yield rate of the product. At the same time, the main crossbeam of the sheet metal is prone to displacement and deformation when the mold is closed. This problem will also affect the product molding and yield rate. Summary of the invention

[0004] The purpose of the present invention is to provide a method for processing a crossbeam bracket of an automobile dashboard through a processing mold of the crossbeam bracket, which reasonably optimizes the matching structure of the sheet metal main crossbeam and the injection mold. The sheet metal main crossbeam can be stably placed in the mold cavity, and before the mold is closed, the pre-pressing protrusion is against the sheet metal main crossbeam to achieve the purpose of pre-pressing and preventing displacement. At the same time, after the mold is closed, the open part occupying a larger area in the sheet metal main crossbeam will be clamped by the upper mold and the lower mold to effectively prevent the sheet metal main crossbeam from bending and deforming due to heat.

[0005] The present invention is achieved in that:

[0006] A method for processing a crossbeam bracket of an automobile instrument panel through a processing mold of the crossbeam bracket, comprising an upper template, a lower template, and a mold cavity formed between the upper template and the lower template for injection molding of the crossbeam bracket, the crossbeam bracket comprising a sheet metal main crossbeam and a wrapping plastic shell integrally injection molded on the sheet metal main crossbeam, the cross section of the sheet metal main crossbeam presents a C-shaped or U-shaped structure with an opening facing downward, the lower template located in the mold cavity is provided with a limiting boss inserted upward into the opening of the sheet metal main crossbeam, the upper template located in the mold cavity is provided with a plurality of pre-stressed bosses that can abut against the sheet metal main crossbeam, a heat flow gap is formed between the sheet metal main crossbeam and the mold cavity for heat flow of molten injection molding raw materials to form a wrapping plastic shell, the outer wall surface of the sheet metal main crossbeam has an open portion and a wrapping portion covered by the wrapping plastic shell, the open portion can be respectively attached to and abut against the cavity wall surfaces of the upper template and the lower template, and the area of ​​the wrapping portion is smaller than the area of ​​the open portion.

[0007] In the above-mentioned method of processing the crossbeam bracket by means of a processing mold for the crossbeam bracket of an automobile instrument panel, a heat flow channel connecting the outside world with the heat flow gap in the mold cavity is opened in the upper mold plate, and the heat flow channel has more than eight heat flow internal ports distributed on the inner wall surface of the mold cavity, wherein a part of the heat flow internal ports are distributed at intervals along the length direction of the sheet metal main crossbeam, and the orientation of the part of the heat flow internal ports is staggered with respect to the sheet metal main crossbeam.

[0008] In the above-mentioned method of processing the cross beam bracket by means of a processing mold for the cross beam bracket of an automobile instrument panel, an upper template groove is provided on the lower surface of the upper template, an upper template body is inserted in and relatively fixed in the upper template groove, a lower template groove is provided on the upper surface of the lower template, a lower template body is inserted in and relatively fixed in the lower template groove, the mold cavity is formed between the upper template body and the lower template body, and both the upper template body and the lower template body are made of 2344 steel.

[0009] In the above-mentioned method of processing the crossbeam bracket by means of a processing mold for the crossbeam bracket of an automobile dashboard, the upper mold body and the lower mold body are respectively composed of six sub-mold bodies, and the sub-mold bodies are detachably connected to the corresponding template grooves, and five of the sub-mold bodies of the upper mold body and the lower mold body are distributed along the length direction of the main crossbeam of the sheet metal.

[0010] In the above-mentioned method of processing the crossbeam bracket by means of a processing mold for the crossbeam bracket of an automobile instrument panel, the edges of two adjacent sub-molds of the same mold body are respectively provided with a dovetail through groove and a dovetail slider that can be plugged into and matched with the dovetail through groove, and the dovetail through groove and the dovetail slider are arranged horizontally or vertically.

[0011] In the above-mentioned method of processing the beam bracket by means of a processing mold for the automobile dashboard beam bracket, the width of the two end portions of the sheet metal main beam is greater than the width of the middle portion, the top surface and the two side walls of the limiting boss are both in contact with the C-shaped or U-shaped inner wall surface of the sheet metal main beam, a plurality of positioning bosses are distributed on the top surface of the limiting boss, and positioning through holes corresponding to the positioning bosses are opened on the sheet metal main beam, the positioning bosses pass through the corresponding positioning through holes from bottom to top and abut against the upper template, and there is a matching clearance between the positioning bosses and the positioning through holes.

[0012] In the above-mentioned method of processing the crossbeam bracket by means of a processing mold for the crossbeam bracket of an automobile dashboard, a reinforcing rib heat flow groove is provided on the limiting boss for wrapping the plastic shell in the C-shape or U-shape of the sheet metal main crossbeam to form a reinforcing rib structure, and a plurality of reinforcing rib heat flow grooves are distributed along the length direction of the sheet metal main crossbeam, and the groove width of the reinforcing rib heat flow groove covered by the sheet metal main crossbeam is less than or equal to 2 mm.

[0013] In the above-mentioned method of machining the crossbeam bracket by means of a machining die for the crossbeam bracket of an automobile instrument panel, the area of ​​the open portion accounts for 60%-75% of the total area of ​​the outer wall surface of the sheet metal main crossbeam.

[0014] In the above-mentioned method for machining the cross beam bracket by a machining mold of the cross beam bracket of the automobile instrument panel, the pre-stressing protrusion is an integrated structure with the upper template, and is formed by extending downward from the upper template, and the lower template is recessed with a pre-stressing avoidance shallow groove corresponding to the position of the pre-stressing protrusion;

[0015] Or the upper template is vertically slidably connected with a prestressing driving column, the upper end of the prestressing driving column extends out of the upper template and is connected to an external hydraulic power source, the lower end face of the prestressing driving column extends downward along its axis to the outside of the upper template and forms the prestressing convex column, and the external hydraulic power source applies a clamping force to the main crossbeam of the sheet metal through the prestressing driving column and the prestressing convex column.

[0016] In the above-mentioned method of processing the crossbeam bracket by means of a processing mold for the automobile dashboard crossbeam bracket, the pre-stressing boss is arranged on an upper template corresponding to the two end positions of the sheet metal main crossbeam, and the pre-stressing boss positions are distributed along the width direction of the sheet metal main crossbeam.

[0017] The outstanding advantages of the present invention compared with the prior art are:

[0018] The present invention has innovative design, high economic benefits, and can effectively improve the yield and production capacity of products. By reasonably optimizing the matching structure of the sheet metal main beam and the injection mold, the sheet metal main beam can be stably placed in the mold cavity, and before mold closing, the pre-pressing protrusion is pressed against the sheet metal main beam to achieve the purpose of pre-pressing and preventing displacement. At the same time, after mold closing, the open part occupying a larger area in the sheet metal main beam will be clamped by the upper mold and the lower mold to effectively prevent the sheet metal main beam from bending and deforming due to heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded stereogram of the processing mold of the present invention;

[0020] Figure 2 is a top view of the crossbeam support of the present invention after injection molding on the lower template;

[0021] Figure 3 It is an exploded view of the cooperation between the sub-mold body and the lower mold plate of the present invention;

[0022] Figure 4 is a three-dimensional diagram of the crossbeam support of the present invention;

[0023] Figure 5 It is a partial enlarged view of the cavity wall surface in the upper mold plate of the present invention.

[0024] In the figure: 1. Upper template; 2. Lower template; 3. Beam bracket; 4. Sheet metal main beam; 5. Wrapping plastic shell; 6. Limiting boss; 7. Pre-stressing boss; 8. Heat flow channel; 9. Lower template groove; 10. Sub-mold body; 11. Positioning boss; 12. Positioning through hole; 13. Reinforcement rib structure; 14. Reinforcement rib heat flow groove. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to specific embodiments. Figure 1 —5:

[0026] A method for processing a crossbeam bracket of an automobile instrument panel through a processing mold of the crossbeam bracket, comprising an upper template 1, a lower template 2, and a mold cavity formed between the upper template 1 and the lower template 2 for injection molding of the crossbeam bracket 3, the crossbeam bracket 3 comprising a sheet metal main crossbeam 4, and a wrapping plastic shell 5 integrally injection molded on the sheet metal main crossbeam 4, the cross section of the sheet metal main crossbeam 4 presents a C-shaped or U-shaped structure with an opening facing downward, the lower template 2 located in the mold cavity is provided with a limiting boss 6 inserted upward into the opening of the sheet metal main crossbeam 4, the upper template 1 located in the mold cavity is provided with a plurality of pre-stressing bosses 7 that can abut against the sheet metal main crossbeam 4, a heat flow gap is formed between the sheet metal main crossbeam 4 and the mold cavity for heat flow of molten injection molding raw materials to form a wrapping plastic shell 5, the outer wall surface of the sheet metal main crossbeam 4 has an open portion and a wrapping portion wrapped and covered by the wrapping plastic shell 5, the open portion can be respectively attached to and abut against the cavity wall surfaces of the upper template 1 and the lower template 2, and the area of ​​the wrapping portion is smaller than the area of ​​the open portion.

[0027] The present invention has innovative design, high economic benefits, and can effectively improve the yield and production capacity of products. By reasonably optimizing the matching structure of the sheet metal main beam 4 and the injection mold, the sheet metal main beam 4 can be stably placed in the mold cavity, and before mold closing, the pre-pressing protrusion 7 is pressed against the sheet metal main beam 4 to achieve the purpose of pre-pressing and preventing displacement. At the same time, after mold closing, the open part occupying a larger area in the sheet metal main beam 4 will be clamped by the upper mold 1 and the lower mold 2 to effectively prevent the sheet metal main beam 4 from bending and deforming due to heat.

[0028] Among them, since the length of the entire automobile dashboard crossbeam bracket 3 is relatively long, in order to reduce the bending deformation of the sheet metal main crossbeam 4 caused by heat, the present invention designs the sheet metal main crossbeam 4 to have a wrapped portion with an area smaller than an open portion, and the open portion is distributed on the entire outer wall surface of the sheet metal main crossbeam 4, and correspondingly, the wrapped portion is also distributed on the entire outer wall surface of the sheet metal main crossbeam 4. Therefore, in order to enable the molten injection molding raw material to quickly enter the mold cavity and complete the injection molding wrapping on the sheet metal main crossbeam 4 to form a wrapped shell, a heat flow channel 8 connecting the outside world and the heat flow gap in the mold cavity is opened in the upper mold plate 1, and the heat flow channel 8 has more than eight heat flow internal ports distributed on the inner wall surface of the mold cavity, wherein a part of the heat flow internal ports are distributed at intervals along the length direction of the sheet metal main crossbeam 4, and the orientation of the part of the heat flow internal ports is staggered with the sheet metal main crossbeam 4. At the same time, it is also necessary to explain that since the molten injection molding material will cool and crystallize when it contacts the colder sheet metal main beam 4, once the narrow heat flow gap is long, the molten injection molding material is very likely to block the heat flow gap due to crystallization before filling the entire heat flow gap, causing the product injection molding to fail. The heat flow internal port is not designed to be directly facing the sheet metal main beam 4, which can effectively prevent the high-pressure and high-temperature molten injection molding material from being directly stamped onto the sheet metal main beam 4 and causing the sheet metal main beam 4 to deform. Therefore, the present invention reasonably adopts the design distribution of multiple heat flow internal ports to ensure that the molten injection molding material can quickly fill the entire mold cavity while the sheet metal main beam 4 is not deformed, thereby improving the strength of the product and effectively improving the injection molding efficiency. In the present embodiment, the hot flow channel 8 has sixteen hot flow internal ports, which can be seen in the attached figure of the specification. Figure 1 and Figure 2 , the dotted line represents the path of the heat flow channel 8.

[0029] Furthermore, in order to effectively control the manufacturing cost of the mold and enable it to perform high-intensity injection molding for a long time, an upper mold 1 groove is opened on the lower surface of the upper mold 1, and an upper mold body is inserted in and relatively fixed in the upper mold 1 groove; a lower mold groove 9 is opened on the upper surface of the lower mold 2, and a lower mold body is inserted in and relatively fixed in the lower mold groove 9; the mold cavity is formed between the upper mold body and the lower mold body, and both the upper mold body and the lower mold body are made of 2344 steel.

[0030] Furthermore, it should be noted that, due to the high hardness of 2344 steel and the large overall length and width of the mold, the cost of the upper mold body and the lower mold body and the milling processing cycle are long, and the processing difficulty is extremely great. Therefore, in order to shorten the processing cycle of the upper mold body and the lower mold body, and reduce the processing cycle of the later mold repair, so as to effectively reduce the maintenance cost, the upper mold body and the lower mold body are respectively composed of six sub-mold bodies 10, and the sub-mold bodies 10 are detachably connected to the corresponding template grooves, and five of the sub-mold bodies 10 of the upper mold body and the lower mold body are distributed along the length direction of the sheet metal main cross beam 4. The sub-mold body 10 can be directly fixed to the corresponding template groove by fastening screws, or a positioning pin driven by a cylinder can be used to achieve the connection between the sub-mold body 10 and the corresponding template groove.

[0031] Furthermore, in order to enable the sub-mold body 10 on the same mold body to form a whole, so as to improve the convenience of placing the sub-mold body 10 in the corresponding template groove and the overall matching stability of the corresponding mold body, the edges of the two adjacent sub-mold bodies 10 of the same mold body are respectively provided with a dovetail groove and a dovetail slider that can be plugged into the dovetail groove, and the dovetail groove and the dovetail slider are arranged horizontally.

[0032] In order to accurately place the sheet metal main beam 4 on the limiting boss 6 of the mold cavity, the width of the two ends of the sheet metal main beam 4 is greater than the width of the middle part, and the top surface and two side walls of the limiting boss 6 are in contact with the C-shaped or U-shaped inner wall surface of the sheet metal main beam 4. A plurality of positioning bosses 11 are distributed on the top surface of the limiting boss 6. Positioning through holes 12 corresponding to the positioning bosses 11 are provided on the sheet metal main beam 4. The positioning bosses 11 penetrate the corresponding positioning through holes 12 from bottom to top and abut against the upper template 1, and there is a matching activity gap between the positioning bosses 11 and the positioning through holes 12. The matching activity gap can be filled with molten injection molding materials during mold closing and injection molding to form a wrapping shell that can wrap and protect the positioning through holes 12.

[0033] At the same time, since the present invention designs the cross-section of the sheet metal main beam 4 to be a C-shaped or U-shaped structure, the supporting strength of the automobile instrument panel beam bracket 3 of the present invention can be further improved by combining the characteristics of the C-shaped or U-shaped structure. The limiting boss 6 is provided with a reinforcing rib heat circulation groove 14 for wrapping the plastic shell 5 to form a reinforcing rib structure 13 in the C-shape or U-shape of the sheet metal main beam 4. There are several reinforcing rib heat circulation grooves 14 distributed along the length direction of the sheet metal main beam 4. In addition, in order to avoid the deformation of the sheet metal main beam 4 caused by excessive contact area between the molten injection molding raw material and the C-shaped or U-shaped inner wall of the sheet metal main beam 4, the width of the groove of the reinforcing rib heat circulation groove 14 covered by the sheet metal main beam 4 is less than or equal to 2 mm.

[0034] Furthermore, in order to ensure that the sheet metal main beam 4 can be stably pressed and fixed between the upper mold 1 and the lower mold 2 after mold closing, so as to effectively prevent the sheet metal main beam 4 from bending and deforming due to heat, the area of ​​the open portion accounts for 60%-75% of the total outer wall area of ​​the sheet metal main beam 4.

[0035] The specific structure of the pre-stressing protrusion 7 on the upper template 1 can be: the pre-stressing protrusion 7 and the upper template 1 are an integrated structure, and it is formed by extending downward from the upper template 1, and the lower template 2 is recessed with a pre-stressing avoidance shallow groove corresponding to the position of the pre-stressing protrusion 7; that is, before mold closing, the pre-stressing protrusion 7 can be against the sheet metal main beam 4, so that the sheet metal main beam 4 can be firmly attached to the limiting boss 6 under the clamping force of the pre-stressing protrusion 7; and in the process of mold closing, the pre-stressing protrusion 7 continues to be pressed down with the upper template 1 so that the sheet metal main beam 4 can be recessed and deformed downward into the pre-stressing avoidance shallow groove, that is, the sheet metal main beam 4 will be subjected to a greater clamping force to effectively prevent the sheet metal main beam 4 from bending and deforming due to heat. It should be noted that the pre-stressing avoidance shallow groove structure is relatively subtle, so the deformation of the sheet metal main beam 4 under the action of the pre-stressing protrusion 7 is very subtle, and has no effect on the supporting strength and actual use of the product automobile dashboard beam bracket 3.

[0036] At the same time, the specific structure of the pre-stressing boss 7 on the upper template 1 can also be: the upper template 1 is vertically slidably connected with a pre-stressing drive column, the upper end of the pre-stressing drive column extends out of the upper template 1 and is connected to an external hydraulic power source, and the lower end face of the pre-stressing drive column extends downward along its axis to the outside of the upper template 1 and forms the pre-stressing boss 7, and the external hydraulic power source applies a clamping force to the sheet metal main beam 4 through the pre-stressing drive column and the pre-stressing boss 7.

[0037] In addition, in this embodiment, the pre-stressing protrusions 7 are arranged on the upper template 1 corresponding to the positions of the two end portions of the sheet metal main beam 4 , and the pre-stressing protrusions 7 are distributed along the width direction of the sheet metal main beam 4 .

[0038] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a crossbeam support of an automobile instrument panel by using a processing mold of the crossbeam support, characterized in that: The invention comprises an upper template (1), a lower template (2), and a mold cavity formed between the upper template (1) and the lower template (2) for injection molding a beam bracket (3), wherein the beam bracket (3) comprises a sheet metal main beam (4) and a wrapping plastic shell (5) integrally injection molded on the sheet metal main beam (4), wherein the cross section of the sheet metal main beam (4) is a C-shaped or U-shaped structure with an opening facing downward, and the lower template (2) located in the mold cavity is provided with a limiting boss (6) inserted upward into the opening of the sheet metal main beam (4), The upper template (1) in the mold cavity is provided with a plurality of pre-pressing protrusions (7) capable of abutting against the sheet metal main cross beam (4), and a heat flow gap is formed between the sheet metal main cross beam (4) and the mold cavity for the heat flow of molten injection molding raw materials to form a wrapping plastic shell (5). The outer wall surface of the sheet metal main cross beam (4) has an open portion and a wrapping portion wrapped and covered by the wrapping plastic shell (5), and the open portion can be respectively attached to and abutted against the mold cavity wall surfaces of the upper template (1) and the lower template (2), and the area of ​​the wrapping portion is smaller than the area of ​​the open portion; The width of the two end portions of the sheet metal main cross beam (4) is greater than the width of the middle portion thereof; the top surface and the two side walls of the limiting boss (6) are both in contact with the C-shaped or U-shaped inner wall surface of the sheet metal main cross beam (4); a plurality of positioning bosses (11) are distributed on the top surface of the limiting boss (6); positioning through holes (12) corresponding to the positioning bosses (11) are provided on the sheet metal main cross beam (4); the positioning bosses (11) penetrate the corresponding positioning through holes (12) from bottom to top and abut against the upper template (1); and a matching clearance exists between the positioning bosses (11) and the positioning through holes (12); The limiting boss (6) is provided with a reinforcing rib heat flow groove (14) for wrapping the plastic shell (5) in the C-shaped or U-shaped sheet metal main cross beam (4) to form a reinforcing rib structure (13), a plurality of reinforcing rib heat flow grooves (14) are distributed along the length direction of the sheet metal main cross beam (4), and the width of the groove of the reinforcing rib heat flow groove (14) covered by the sheet metal main cross beam (4) is less than or equal to 2 mm; The open portion is distributed on the entire outer wall surface of the sheet metal main beam (4), and correspondingly, the wrapped portion is also distributed on the entire outer wall surface of the sheet metal main beam (4). In order to enable the molten injection molding material to quickly enter the mold cavity and complete the injection molding wrapping on the sheet metal main beam (4) to form a wrapped shell, a heat flow channel (8) is opened in the upper mold plate (1) to connect the outside and the heat flow gap in the mold cavity. The heat flow channel (8) has more than eight heat flow internal ports distributed on the inner wall surface of the mold cavity, wherein a part of the heat flow internal ports are distributed at intervals along the length direction of the sheet metal main beam (4), and the direction of the part of the heat flow internal ports is staggered with the sheet metal main beam (4).

2. The method for machining the cross beam bracket of an automobile instrument panel through a machining mold of the cross beam bracket according to claim 1, characterized in that: The upper mold plate (1) has an upper mold plate groove on its lower surface, an upper mold body is inserted into and relatively fixed in the upper mold plate groove, the lower mold plate (2) has a lower mold plate groove (9) on its upper surface, a lower mold body is inserted into and relatively fixed in the lower mold plate groove (9), the mold cavity is formed between the upper mold body and the lower mold body, and both the upper mold body and the lower mold body are made of 2344 steel.

3. The method for machining the cross beam bracket of an automobile instrument panel through a machining mold of the cross beam bracket according to claim 2, characterized in that: The upper mold body and the lower mold body are respectively composed of six sub-mold bodies (10), and the sub-mold bodies (10) are detachably connected to the corresponding template grooves, and five of the sub-mold bodies (10) of the upper mold body and the lower mold body are distributed along the length direction of the sheet metal main crossbeam (4).

4. The method for machining the cross beam bracket by using a machining die of the cross beam bracket of the automobile instrument panel according to claim 3, characterized in that: The edges of two adjacent sub-mold bodies (10) of the same mold body are respectively provided with a dovetail through groove and a dovetail slider that can be plugged into and matched with the dovetail through groove, and the dovetail through groove and the dovetail slider are arranged horizontally or vertically.

5. The method for machining the cross beam bracket of an automobile instrument panel through a machining mold of the cross beam bracket according to claim 1, characterized in that: The area of ​​the open portion accounts for 60%-75% of the total area of ​​the outer wall surface of the sheet metal main cross beam (4).

6. The method for machining the cross beam bracket of an automobile instrument panel through a machining mold of the cross beam bracket according to claim 1, characterized in that: The pre-pressing convex column (7) and the upper template (1) are of an integrated structure and are formed by extending the upper template (1) downwards; the lower template (2) is recessed with a pre-pressing avoidance shallow groove corresponding to the position of the pre-pressing convex column (7); Or the upper template (1) is vertically slidably connected to a pre-stressing drive column, the upper end of the pre-stressing drive column extends out of the upper template (1) and is connected to an external hydraulic power source, the lower end surface of the pre-stressing drive column extends downward along its axis to the outside of the upper template (1) and forms the pre-stressing convex column (7), and the external hydraulic power source applies a pressing force to the sheet metal main cross beam (4) through the pre-stressing drive column and the pre-stressing convex column (7).

7. A method for machining the cross beam bracket of an automobile instrument panel by using a machining die of the cross beam bracket according to claim 1 or 6, characterized in that: The pre-pressing convex columns (7) are arranged on the upper template (1) corresponding to the positions of the two end portions of the sheet metal main cross beam (4), and the pre-pressing convex columns (7) are distributed along the width direction of the sheet metal main cross beam (4).

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