Strength testing device for columnar parts of automobile safety air bag

Abstract

The utility model discloses an automobile airbag columnar part strength testing device, which comprises a part seat, a test sleeve and a test hammer in sliding fit with the test sleeve, the test hammer comprises a hammer body and a positioning head positioned at one end of the hammer body, and the positioning head is matched with the inner surface of a small cylindrical section of a part to be tested. The joint of the hammer body and the positioning head is provided with a chamfering part which is in profiling with an arc transition part of a to-be-detected part. And the chamfering radius of the chamfering part is equal to the radius of the arc transition part. According to the utility model, the test hammer is specifically designed according to the design requirements of parts, the positioning head is used for positioning and guiding, the centrality is ensured, the contact between the chamfering part and the to-be-tested part ensures that the whole area of the arc transition part is uniformly stressed, and the chamfering part is the part which is firstly contacted with the to-be-tested part, so that the precision of the test hammer is ensured. Therefore, the strength of the arc transition part can be accurately tested, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of parts strength testing, in particular to a strength testing device for columnar parts of automobile airbags. Background Art

[0002] Automobile airbags are very important passive safety components in automobile systems. They can provide safety protection for passengers when a vehicle collides and reduce the degree of injury to passengers in traffic accidents. The core components of automobile airbags are columnar parts. Their function is to ensure that the outer surface is not damaged during high-intensity explosions. Therefore, high strength requirements are placed on them. The structure of the columnar parts is as follows: Figure 1 As shown, it includes a small cylindrical section 101, a large cylindrical section 102 and a bending section 103 connecting the small cylindrical section 101 and the large cylindrical section 102. The end of the bending section 103 connected to the small cylindrical section 101 has an arc transition portion 104 protruding inward. When a collision occurs, the arc transition portion 104 is subjected to the greatest impact force. Therefore, the arc transition portion 104 needs to be tested as the main stress point. The design requirements are: the stress point must withstand an impact force test of more than 500N, and no fracture shall occur in the stress point area.

[0003] For impact force testing of parts, a test hammer is generally used to press the parts. Traditional test hammers are in flat contact with the parts and do not take into account the local force uniformity requirements of the parts. Therefore, the test hammers are not specially designed, and the feasibility of the test data is not high, resulting in insufficient strength of the arc transition part of columnar parts. Utility Model Content

[0004] In order to solve the technical problem that the test hammer of the part impact test in the prior art is in planar contact with the part, and the local force uniformity requirement of the part is not taken into consideration, resulting in low feasibility of the test data, the utility model provides a strength testing device for columnar parts of automobile airbags to solve the above problem.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a strength testing device for columnar parts of automobile airbags, comprising a part seat, a test sleeve and a test hammer slidably matched with the test sleeve, the test hammer comprising a hammer body and a positioning head located at one end of the hammer body, the positioning head matching the inner surface of the small cylindrical section of the part to be tested, and a chamfered portion that imitates the circular arc transition portion of the part to be tested is provided at the connection between the hammer body and the positioning head; the chamfer radius of the chamfered portion is equal to the radius of the circular arc transition portion.

[0006] Furthermore, the difference between the diameter of the positioning head and the inner diameter of the small cylindrical section is 0.15 mm to 0.2 mm.

[0007] Furthermore, the chamfer radius of the chamfered portion is 6 mm.

[0008] Furthermore, the length of the positioning head is 3mm~4mm.

[0009] Furthermore, in the initial state, the minimum distance between the test hammer and the part seat is 1.3m~1.4mm.

[0010] Furthermore, the test hammer also includes a guide block connected to the hammer body, and the guide block is in sliding cooperation with the test sleeve.

[0011] Furthermore, the outer diameter of the hammer is smaller than the inner diameter of the large cylindrical section of the part to be measured.

[0012] Furthermore, the hammer body is a cylindrical structure.

[0013] Furthermore, the part seat has a groove for placing the part to be tested, and the groove includes a supporting groove that cooperates with the large cylindrical section and the bending section and a through hole for the small cylindrical section to extend into, and the inner diameter of the through hole is larger than the outer diameter of the arc transition part.

[0014] Furthermore, the length of the hammer body is greater than or equal to the height of the support groove.

[0015] The beneficial effects of the utility model are:

[0016] (1) The utility model specifically designs the test hammer according to the design requirements of the parts. The positioning and guidance are performed by the positioning head to ensure the centering. The contact between the chamfered part and the part to be tested is then used to ensure that the force is evenly distributed over the entire arc transition area. The chamfered part is the first part to contact the part to be tested. Therefore, the strength of the arc transition area can be accurately tested, thereby improving the test accuracy.

[0017] (2) The utility model has a unique design for the part seat. The part seat contacts the outer area of ​​the part to be tested, stably placing the part to be tested. The test hammer contacts the inner area of ​​the part to be tested, and the arc transition part is in an unsupported state, which is more consistent with the actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 It is a structural diagram of columnar parts of automobile airbags;

[0020] Figure 2 This is a schematic diagram of the vehicle airbag columnar parts strength testing device of the present invention in a state ready to drop the hammer;

[0021] Figure 3 This is a schematic diagram of the vehicle airbag columnar parts strength testing device of the present invention in a hammer drop state;

[0022] Figure 4 It is an enlarged view of the contact area between the test hammer and the part to be tested;

[0023] Figure 5 It is a schematic diagram of the cooperation between the part seat and the part to be measured.

[0024] In the figure, 1. part to be tested, 101. small cylindrical section, 102. large cylindrical section, 103. bending section, 104. arc transition section, 2. part seat, 3. test sleeve, 4. test hammer, 401. hammer body, 402. positioning head, 403. chamfered section, 404. guide block, 5. groove, 501. support groove, 502. through hole. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] like Figure 2-Figure 5 As shown, a strength testing device for cylindrical parts of automobile airbags includes a part holder 2, a test sleeve 3, and a test hammer 4 that slides with the test sleeve 3. The test hammer 4 includes a hammer body 401 and a positioning head 402 located at one end of the hammer body 401. The positioning head 402 cooperates with the inner surface of the small cylindrical section 101 of the part 1 to be tested. The connection between the hammer body 401 and the positioning head 402 is provided with a chamfered portion 403 that is contoured to the arc transition portion 104 of the part 1 to be tested. The chamfer radius of the chamfered portion 403 is equal to the radius of the arc transition portion 104.

[0027] During testing, the test hammer 4 strikes the surface of the part 1 under test in a nearly free-falling manner. The test sleeve 3 ensures that the test hammer 4 descends vertically, the hammer body 401 presses against the part 1 under test, and the positioning head 402 extends into the small cylindrical section 101 and achieves axial positioning by cooperating with the inner surface of the small cylindrical section 101, ensuring that the chamfered portion 403 accurately lands on the arc transition portion 104. Because the small cylindrical section 101 faces upward when the part is placed, the arc transition portion 104 protrudes upward. After the test hammer 4 falls, the chamfered portion 403 first contacts the arc transition portion 104. Through the rational design of the radius of the chamfered portion 403, the entire area of ​​the arc transition portion 104 is simultaneously subjected to the impact force of the test hammer 4, ensuring the accuracy of the test results.

[0028] The shape of the test hammer 4 in the present invention is designed according to the characteristics of the part to be tested 1, which can effectively ensure the accuracy of the test contact surface and the part to be tested 1. From the design perspective of the part to be tested 1, this arc transition part 104 is the core area of ​​force and also the core part of the entire part. The standard test hammer 4 test can cover the entire test point, ensuring the reliability, accuracy and stability of the test, thereby meeting the customer's usage requirements.

[0029] For columnar parts used inside automobile airbags, the radius of the arc transition portion 104 is usually 6 mm. Therefore, the chamfer radius of the chamfered portion 403 in the present invention is 6 mm.

[0030] The positioning head 402 needs to extend into the interior of the small cylindrical section 101, such as Figure 4 However, the length of the positioning head 402 cannot be too long, otherwise the impact and vibration will cause deformation of the inner surface of the small cylindrical section 101. For cylindrical parts used in automobile airbags, the length of the small cylindrical section 101 is usually 6mm. Therefore, the length of the positioning head 402 is preferably 3mm to 4mm.

[0031] Since the test hammer 4 is in free fall, when the weight of the test hammer 4 is constant, the initial height of the test hammer 4 can be calculated using the physics of free fall. For a specified impact force requirement, the heavier the weight of the test hammer 4, the lower the initial height, and vice versa. When the initial height of the test hammer 4 is too high, the sliding fit accuracy of the test hammer 4 and the test sleeve 3 is required to be higher, otherwise it will cause the test hammer 4 to vibrate, resulting in the test hammer 4 not being able to accurately fall on the surface of the part to be tested 1, and the test failing. When the initial height of the test hammer 4 is too low, the weight of the test hammer 4 is too heavy, and it is more difficult to lift it. For this reason, the present invention preferably sets the minimum distance between the test hammer 4 and the part seat 2 to be 1.3m~1.4mm.

[0032] The sliding fit between the test hammer 4 and the test sleeve 3 can be achieved by the guide block 404 on the test hammer 4, as shown in FIG. Figure 2 As shown, the guide block 404 is located above the hammer body 401 , and the guide block 404 is in contact with the inner surface of the test sleeve 3 and slides up and down along the surface of the test sleeve 3 .

[0033] Furthermore, the test hammer 4 further includes a guide block 404 connected to the hammer body 401 , and the guide block 404 is in sliding cooperation with the test sleeve 3 .

[0034] To prevent interference between hammer 401 and large cylindrical section 102, the outer diameter of hammer 401 is preferably smaller than the inner diameter of large cylindrical section 102 of part 1 to be tested. After test hammer 4 is lowered, only chamfered portion 403 of hammer 401 contacts part 1 to be tested. While hammer 401 is preferably cylindrical in shape, other irregular shapes are acceptable, as long as they do not interfere with part 1 to be tested and meet the aforementioned contact requirements.

[0035] The part seat 2 is used to place the part 1 to be tested and to limit the part 1 to be tested, so as to prevent the part 1 to be tested from being displaced or tilted during the pressing process of the test hammer 4. In the specific embodiment of the present utility model, Figure 3 and Figure 5 As shown, the part seat 2 has a groove 5 for placing the part 1 to be tested. The groove 5 includes a support groove 501 that cooperates with the large cylindrical section 102 and the bent section 103, and a through hole 502 for the small cylindrical section 101 to extend into. The inner diameter of the through hole 502 is larger than the outer diameter of the arc transition portion 104. The groove 5 is an annular groove that surrounds the part 1 to be tested. The support groove 501 is used to support the part 1 to be tested. The inner sidewall of the support groove 501 is in contact with the large cylindrical section 102, limiting the part 1 to be tested and preventing it from tilting. The through hole 502 does not contact the small cylindrical section 101. The outer diameter of the arc transition portion 104 refers to the diameter of the outermost edge of the arc transition portion 104. The larger diameter of the through hole 502 prevents the part seat 2 from contacting the compressed portion of the part 1 to be tested, ensuring that the arc transition portion 104 is suspended, more realistically simulating actual use.

[0036] The length of the hammer body 401 is preferably greater than or equal to the height of the support groove 501 to prevent the structure above the hammer body 401, such as the guide block 404, from contacting the part seat 2, resulting in inaccurate test results.

[0037] The test device described in this utility model is easy to use and has low testing costs. It can effectively check the strength of the test piece, significantly improving quality and cost control. Furthermore, the operational safety factor is high. The test hammer 4 is protected by the test sleeve 3, effectively preventing safety issues caused by falls or collisions. In conventional designs, a protective door can also be provided on one side of the test device to provide further safety protection.

[0038] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "inside", "outside", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In this specification, the schematic representations of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments.

[0040] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A strength testing device for columnar parts of automobile airbags, characterized by: The invention comprises a part seat (2), a test sleeve (3) and a test hammer (4) which is slidably matched with the test sleeve (3); the test hammer (4) comprises a hammer body (401) and a positioning head (402) located at one end of the hammer body (401); the positioning head (402) is matched with the inner surface of the small cylindrical section (101) of the part to be tested (1); a chamfered portion (403) which is shaped like the arc transition portion (104) of the part to be tested (1) is provided at the connection between the hammer body (401) and the positioning head (402); and the chamfered radius of the chamfered portion (403) is equal to the radius of the arc transition portion (104).

2. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: The difference between the diameter of the positioning head (402) and the inner diameter of the small cylindrical section (101) is 0.15 mm to 0.2 mm.

3. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: The chamfer radius of the chamfered portion (403) is 6 mm.

4. The vehicle airbag columnar parts strength testing device according to claim 2, characterized in that: The length of the positioning head (402) is 3 mm to 4 mm.

5. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: In the initial state, the minimum distance between the test hammer (4) and the part seat (2) is 1.3m~1.4mm.

6. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: The test hammer (4) further comprises a guide block (404) connected to the hammer body (401), and the guide block (404) is in sliding engagement with the test sleeve (3).

7. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: The outer diameter of the hammer (401) is smaller than the inner diameter of the large cylindrical section (102) of the part to be measured (1).

8. The vehicle airbag columnar parts strength testing device according to claim 7, characterized in that: The hammer body (401) is a cylindrical structure.

9. The vehicle airbag columnar parts strength testing device according to claim 1, characterized in that: The part seat (2) has a groove (5) for placing the part to be tested (1), the groove (5) including a support groove (501) cooperating with the large cylindrical section (102) and the bent section (103) and a through hole (502) for the small cylindrical section (101) to extend into, and the inner diameter of the through hole (502) is larger than the outer diameter of the arc transition portion (104).

10. The vehicle airbag columnar parts strength testing device according to claim 9, characterized in that: The length of the hammer body (401) is greater than or equal to the height of the support groove (501).

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