Machining process for safety airbag inner insert

Abstract

A machining process for a safety airbag inner insert, said process comprising: punching out multiple workpiece blank positions (21) along the length of a galvanized steel strip (2); pressing out a hollow boss (3) on each workpiece blank position, an outer ring of the hollow boss forming a flange edge (14) of a safety airbag inner insert (1); pressing out a step (4) on a side wall of the hollow boss; cutting out a concave-convex shape (6) on an end face of the hollow boss; punching a hole in the concave-convex shape to form a fixing hole (17) of the safety airbag inner insert; flipping the concave-convex shape outwards to form a cylindrical body (7), the cylindrical body being flush with the step, forming a fastener part (11) and a foot (16); expanding the diameter of the cylindrical body to match the diameter of the hollow boss; pressing a crease (8) at a connection position between the cylindrical body and the step, forming an inwardly concave neck (12); applying radial pressure to the cylindrical body to form a positioning rib (13); bending the foot to a set angle; punching out a mounting hole (15) of the safety airbag inner insert on the flange edge; and cutting off a connection between the flange edge and the galvanized steel strip. The described process can form thin-walled, highly consistent safety airbag inner insert products, ensuring the accuracy of the safety airbag inner insert, improving material utilization and achieving high production efficiency.

Description

Airbag inner insert processing technology Technical Field

[0001] The present application relates to the field of cold stamping technology, for example, to a process for processing airbag inserts. Background Art

[0002] The airbag inner insert is a crucial airbag component, widely used in automotive airbags to secure the airbag body to the vehicle. As shown in Figures 1 and 2, the airbag inner insert 1 used in new energy vehicles features a complex structural design. It includes a circular snap-on portion 11 with a recessed neck 12 and positioning ribs 13. One end of the snap-on portion 11 is provided with a flange 14 uniformly distributed with mounting holes 15. The other end of the snap-on portion 11 is provided with a leg 16, which has a certain bending angle and is provided with fixing holes 17.

[0003] The traditional manufacturing process of airbag inserts is to use aluminum die-casting to make blanks, and then cut them into pieces. The disadvantages are serious waste of materials, low production efficiency, heavy quality of the molded products, and complicated processes. Therefore, the traditional manufacturing process cannot meet the product molding requirements and needs further optimization.

[0004] Summary of the Invention

[0005] The present application provides a processing technology for airbag inner inserts, which ensures the molding quality of airbag inner inserts and improves production efficiency.

[0006] A process for processing an airbag inner insert, comprising:

[0007] Punching and arranging, punching out workpiece positions along the length of the galvanized steel strip;

[0008] Stretching, pressing out a hollow boss on each workpiece material level, the outer ring of the hollow boss forms the flange edge of the airbag inner insert;

[0009] Shaping, pressing steps on the side walls of the hollow boss;

[0010] Punching the bottom to cut out concave and convex shapes on the end face of the hollow boss;

[0011] Punch holes in the concave and convex shapes in one step to form the fixing holes for the airbag inserts;

[0012] Flip the hole, turn the concave and convex shape outward to form a cylinder, the cylinder is flush with the step, and the buckle part and support foot of the airbag inner insert are formed;

[0013] Expanding the mouth to expand the diameter of the cylinder to the same diameter as the hollow boss;

[0014] Flattening, pressing out a crease at the connection between the cylinder and the step to form the concave neck of the airbag insert;

[0015] Pressing ribs: applying radial pressure to the cylinder to form positioning ribs for the inner insert of the airbag;

[0016] Bend, bend the legs to the set angle;

[0017] Secondary punching: punching out the mounting holes for the airbag inserts on the flange edge;

[0018] The material is dropped, the connection between the flange and the galvanized steel strip is cut off, and the finished product falls freely.

[0019] In one embodiment, punching out a plurality of workpiece levels along the length of a galvanized steel strip comprises:

[0020] First, multiple positioning holes are punched out on the galvanized steel strip along its length, and the workpiece material level is set between two adjacent positioning holes. Then, a gap is punched out on the galvanized steel strip to separate the two adjacent workpiece material levels.

[0021] In one embodiment, after pressing the step on the side wall of the hollow boss and before cutting the concave and convex shapes on the end surface of the hollow boss, the method further includes:

[0022] Stamping: Pressing an indentation on the end face of the hollow boss to facilitate punching and positioning.

[0023] In one embodiment, the indentation does not extend beyond the edge of the concave-convex shape.

[0024] In one embodiment, punching out a mounting hole for an airbag inner insert includes:

[0025] The evenly distributed mounting holes are punched in steps, and two adjacent mounting holes are staggered in forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a front view of the structure of an airbag inner insert product;

[0027] FIG2 is a top view of the structure of an airbag inner insert product;

[0028] FIG3 is a flow chart of a process for processing an airbag inner insert provided in an embodiment of the present application;

[0029] FIG4 is a structural schematic diagram corresponding to step S010 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0030] FIG5 is a structural schematic diagram corresponding to step S020 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0031] FIG6 is a top view of FIG5;

[0032] FIG7 is a structural schematic diagram corresponding to step S030 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0033] FIG8 is a top view of FIG7;

[0034] FIG9 is a schematic structural diagram corresponding to step S040 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0035] FIG10 is a top view of FIG9;

[0036] FIG11 is a schematic structural diagram corresponding to step S050 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0037] FIG12 is a top view of FIG11;

[0038] FIG13 is a schematic structural diagram corresponding to step S060 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0039] FIG14 is a top view of FIG13;

[0040] FIG15 is a schematic structural diagram corresponding to step S070 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0041] FIG16 is a top view of FIG15;

[0042] FIG17 is a schematic structural diagram corresponding to step S080 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0043] FIG18 is a top view of FIG17;

[0044] FIG19 is a schematic structural diagram corresponding to step S090 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0045] FIG20 is a top view of FIG19;

[0046] FIG21 is a schematic structural diagram corresponding to step S100 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0047] Figure 22 is a top view of Figure 21;

[0048] FIG23 is a schematic structural diagram corresponding to step S110 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0049] FIG24 is a top view of FIG23;

[0050] FIG25 is a schematic structural diagram corresponding to step S120 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0051] Figure 26 is a top view of Figure 25;

[0052] FIG27 is a schematic structural diagram corresponding to step S120 in another airbag inner insert processing process provided in an embodiment of the present application;

[0053] FIG28 is a top view of FIG27;

[0054] FIG29 is a schematic structural diagram corresponding to step S130 in a process for processing an airbag inner insert provided in an embodiment of the present application;

[0055] FIG30 is a top view of FIG29.

[0056] In the figure: 1. Airbag insert; 11. Buckle part; 12. Concave neck; 13. Positioning rib; 14. Flange edge; 15. Mounting hole; 16. Support foot; 17. Fixing hole; 2. Galvanized steel strip; 21. Workpiece level; 22. Positioning hole; 23. Gap; 3. Hollow boss; 4. Step; 5. Indentation; 6. Concave and convex shape; 7. Cylinder; 8. Crease. DETAILED DESCRIPTION

[0057] The technical solutions of the embodiments of the present application will be described below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present application.

[0058] This embodiment provides a processing technology for airbag inner inserts. For the airbag inner insert 1 shown in Figures 1 and 2, the process is optimized to solve the problems of traditional die-casting and cutting molding methods such as material waste, complex process, low production efficiency, and poor product quality, thereby ensuring molding quality.

[0059] As shown in Figure 3, the airbag inner insert processing technology includes:

[0060] Step S010, punching and arranging: punching out workpiece material positions 21 one by one on the galvanized steel strip 2 along its length direction, as shown in FIG. 4 for details.

[0061] In the punching and layout step, a plurality of positioning holes 22 are first punched out on the galvanized steel strip 2 along its length direction, and the workpiece material level 21 is set between two adjacent positioning holes 22. Then, a gap 23 is punched out on the galvanized steel strip 2 to separate the two adjacent workpiece material levels 21 to optimize the layout and make full use of the area of ​​the galvanized steel strip 2.

[0062] Step S020, stretching: a hollow boss 3 is pressed out on each workpiece material level 21, and the outer ring of the hollow boss 3 forms the flange edge 14 of the airbag inner insert 1, see Figures 5 and 6 for details.

[0063] Step S030 , shaping: pressing out a step 4 on the side wall of the hollow boss 3 , as shown in FIG. 7 and FIG. 8 . The step 4 here is for the subsequent forming of the concave neck 12 .

[0064] Step S040: stamping, stamping out an indentation 5 on the end surface of the hollow boss 3 to facilitate punching and positioning, as shown in FIG9 and FIG10 for details, so as to facilitate subsequent positioning and material extension.

[0065] Step S050, punching the bottom: cutting out the concave-convex shape 6 on the end surface of the hollow boss 3, as shown in Figures 11 and 12. The indentation 5 should not exceed the edge of the concave-convex shape 6 to avoid affecting the molding quality.

[0066] Step S060, primary punching: punching holes on the concave-convex shape 6 to form the fixing holes 17 of the airbag inner insert 1, see Figures 13 and 14 for details.

[0067] Step S070, turning the hole: turning the concave-convex shape 6 outward to form a cylinder 7, which is flush with the step 4, to form the buckle portion 11 and the support leg 16 of the airbag inner insert 1, see Figures 15 and 16 for details.

[0068] Step S080, expanding: expanding the diameter of the cylinder 7 to be consistent with the diameter of the hollow boss 3, see Figures 17 and 18 for details.

[0069] Step S090, flattening: press out a fold 8 at the connection between the cylinder 7 and the step 4 to form the concave neck 12 of the airbag inner insert 1, as shown in Figures 19 to 20 for details.

[0070] Step S100 , rib pressing: radially pressurizing the cylinder 7 to form the positioning ribs 13 of the airbag inner insert 1 , as shown in FIG. 21 to FIG. 22 for details.

[0071] Step S110 , bending: bend the legs 16 to a set angle, see FIG. 23 to FIG. 24 for details.

[0072] Step S120, secondary punching: Punch out mounting holes 15 for the airbag inner insert 1 on the flange edge 14. For example, the evenly distributed mounting holes 15 are punched in steps, and two adjacent mounting holes 15 are staggered to ensure the molding quality of the densely distributed holes. This embodiment takes the two-step molding as an example, see Figures 25 to 28 for details.

[0073] Step S130, blanking: cutting off the connection between the flange edge 14 and the galvanized steel strip 2, and the finished product falls freely, as shown in Figures 29 to 30 for details, and finally blanking to obtain the target airbag inner insert 1 product.

[0074] Therefore, the above-mentioned airbag inner insert processing technology realizes a series of processes such as punching and patterning, stretching, shaping, bottoming, punching, hole turning, expanding, flattening, rib pressing, bending, and blanking, thereby forming a thin-walled, consistent airbag inner insert 1 product, ensuring the accuracy of the airbag inner insert 1, improving material utilization, high production efficiency, and light product quality.

[0075] The embodiment of the present application further provides an airbag inner insert, which is manufactured based on the above-mentioned airbag inner insert processing technology and has multiple structures of the airbag inner insert 1 formed in the above-mentioned process.

Claims

1. Airbag inner insert processing technology, including: Punching and arranging, punching out a plurality of workpiece material positions (21) on the galvanized steel strip (2) along the length direction of the galvanized steel strip (2); Stretching to press out a hollow boss (3) on each workpiece material level (21), wherein the outer ring of the hollow boss (3) forms a flange edge (14) of the airbag inner insert (1); Shaping, pressing a step (4) on the side wall of the hollow boss (3); Punching the bottom to cut out concave and convex shapes (6) on the end surface of the hollow boss (3); Punching once to punch holes in the concave-convex shape (6) to form a fixing hole (17) for the airbag inner insert (1); Folding the hole, turning the concave-convex shape (6) outward to form a cylinder (7), wherein the cylinder (7) is flush with the step (4), thereby forming the buckle portion (11) and the support leg (16) of the airbag inner insert (1); Expanding the barrel (7) to a diameter that is consistent with the diameter of the hollow boss (3); Flattening to form a fold (8) at the connection between the cylinder (7) and the step (4) to form a concave neck (12) of the airbag inner insert (1); Pressing ribs to apply radial pressure to the cylinder (7) to form positioning ribs (13) of the airbag inner insert (1); Bending, bending the support leg (16) to a set angle; Secondary punching to punch out a mounting hole (15) for the airbag inner insert (1) on the flange edge (14); The material is dropped, the connection between the flange edge (14) and the galvanized steel strip (2) is cut off, and the finished product falls freely.

2. The processing technology of the airbag insert according to claim 1, wherein, Punching out a plurality of workpiece material levels (21) on the galvanized steel strip (2) along the length direction of the galvanized steel strip (2) comprises: First, a plurality of positioning holes (22) arranged at equal intervals are punched out on the galvanized steel strip (2) along the length direction of the galvanized steel strip (2), the workpiece material level (21) is set between two adjacent positioning holes (22), and then a gap (23) is punched out on the galvanized steel strip (2) to separate the two adjacent workpiece material levels (21).

3. The airbag inner insert processing process according to claim 1, after pressing the step (4) on the side wall of the hollow boss (3) and before cutting the concave and convex shape (6) on the end surface of the hollow boss (3), further comprising: Embossing: an indentation (5) configured for punching positioning is pressed out on the end surface of the hollow boss (3).

4. The airbag insert processing technology according to claim 3, wherein, The indentation (5) does not extend beyond the edge of the concave-convex shape (6).

5. The airbag insert processing technology according to claim 1, wherein, The mounting hole (15) punched out of the airbag inner insert (1) comprises: The evenly distributed mounting holes (15) are punched in steps, and two adjacent mounting holes (15) are staggered in forming.

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