A tooling fixture and detection method for imitating riveting and pressing

Abstract

The present invention discloses a tooling fixture and a detection method for imitating riveting and pressing, including: a base; the inner side of the base is a stepped through-hole, and a riveting block is placed inside the base; several riveting points are provided inside the riveting block, and the stressed part is placed inside the riveting block by cooperating with the stressed part through the riveting points; the upper part of the stressed part is matched with a pressing rod, and the strength of the stressed part is detected by pressing down the pressing rod; this device rivets and presses the stressed part according to the assembly riveting and pressing requirements, tests its tensile strength, without waiting to test the strength of the gas spring after assembly, saving resources and improving production efficiency; it can quickly test the strength of the stressed part after riveting and pressing, and the strength value is basically the same as the riveting strength result after assembly.

Description

Technical Field

[0001] The present invention relates to the field of automotive part measurement, and particularly to a tooling fixture and a detection method for imitating riveting and pressing. Background Art

[0002] With the continuous improvement of quality requirements in the automotive industry, the main engine factories have higher and higher performance requirements for various automotive components. The strength problem of the gas spring components manufactured by powder metallurgy has become a key topic for each gas spring component manufacturer and also a quality control point for the gas spring general assembly factory.

[0003] After the gas spring is assembled, its strength needs to be verified. Among them, the main load-bearing parts are riveted and fixed to the gas spring cylinder. Therefore, before each production of such riveted and stressed parts, it is necessary to conduct assembly verification of strength, resulting in a large amount of time waiting. Production can only start after passing the verification, which not only has low production efficiency but also high costs and a cumbersome process.

[0004] The patent with the publication number CN110260150A provides a gas spring inflation pressure detection device. The gas spring is inflated through a relay mechanism, making the inflation pressure and speed of the gas spring equal each time, improving the qualification rate of gas spring inflation processing. However, this device does not perform strength detection on the load-bearing parts during the gas spring processing and production.

[0005] The patent with the publication number CN208283055U provides a gas spring strength testing machine, including a pair of vertically arranged support frames. A fixed rod is arranged between the tops of the support frames on both sides, and a mounting seat is arranged between the bottoms of the support frames on both sides. A detection cylinder with a vertically downward piston rod is installed on the fixed rod, and a sliding rod is fixed on the support frame along the length direction of the support frame. A lifting seat is slidably connected to the sliding rod.

[0006] The above two technical solutions both perform overall strength detection on the gas spring after production and assembly. However, the strength test is a destructive test, not only taking a long time for assembly detection but also causing waste of the assembled gas spring assembly. Summary of the Invention

[0007] In view of the problems that the existing verification of the strength of the load-bearing parts of the gas spring is relatively cumbersome, the assembly detection time is relatively long, and there is waste of the assembled gas spring assembly, the present invention specifically proposes a tooling fixture and a detection method for imitating riveting and pressing.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A tooling fixture for imitating riveting and pressing, comprising:

[0009] A base;

[0010] The inner side of the base is a stepped through-hole, and a riveting block is placed inside the base;

[0011] Several riveting points are provided inside the riveting block, and the stress-bearing part is placed inside the riveting block by cooperating with the stress-bearing part through the riveting points;

[0012] The upper part of the stress-bearing part is matched with a pressing rod, and the strength of the stress-bearing part is detected by pressing down the pressing rod.

[0013] As a further description of the above technical solution: The inner diameter of the base and the outer diameter of the riveting block are in clearance fit.

[0014] As a further description of the above technical solution: The number of the riveting blocks is at least two, and several of the riveting points are arranged inside the riveting block and are flush in position.

[0015] As a further description of the above technical solution: The stress-bearing part is circular ring-shaped, and an annular groove is formed on the outer side wall, and the annular groove is matched with the riveting points.

[0016] As a further description of the above technical solution: The pressing rod is a stepped round rod, and one side of the pressing rod extends into the inside of the stress-bearing part and is in clearance fit with the stress-bearing part.

[0017] As a further description of the above technical solution: Grooves are formed on both end faces of the stress-bearing part, and the grooves are in contact with the shoulders of the pressing rod.

[0018] As a further description of the above technical solution: A chamfer is formed inside the base, the riveting block includes an extending section and a matching section, and an inclined surface is provided between the extending section and the matching section, and the chamfer and the inclined surface have the same inclination angle.

[0019] As a further description of the above technical solution: A through-hole is provided below the base, and the diameter of the pressing rod is smaller than the diameter of the through-hole.

[0020] As a further description of the above technical solution: The density of the stress-bearing part is 6.4 g / cm 3 -6.5 g / cm 3 , the surface hardness is 55-70 HRF, and the compressive strength of the internal riveting points is greater than or equal to 5000 N.

[0021] It also includes a detection method, and the detection method is used for the tooling fixture described in any one of the above technical solutions, including:

[0022] S1: Select a suitable riveting block according to the riveting requirements, and match the riveting points inside the riveting block with the annular grooves outside the stress-bearing part;

[0023] S2: Place the insertion section of the riveting block at the stepped through-hole of the base, and apply a certain pressure above the riveting block through a compression testing machine, so that the riveting block is pressed into the inner side of the base, and the riveting point clamps the stressed part.

[0024] S3: Take out the base, place the pressing rod above the stressed part to cooperate with the stressed part, then put it into the compression testing machine again, continuously apply pressure to extrude downward, and judge whether it is qualified by monitoring the displacement of the pressing block of the compression testing machine and the stress of the stressed part.

[0025] The above technical solution has the following advantages or beneficial effects:

[0026] 1. The device of the present invention can rivet the stressed part according to the assembly riveting requirements, test its tensile strength, without waiting to test the strength of the gas spring after assembly, saving resources and improving production efficiency.

[0027] 2. Different imitation riveting tooling fixtures can be used to adapt to various riveting point sizes during riveting. By adjusting the size of the imitation riveting tooling fixture, the depth of the riveting point during riveting can be controlled, and the strength test of the product after riveting can be carried out.

[0028] 3. The strength of the stressed part after riveting can be quickly tested, and the strength value is basically the same as the riveting strength result after assembly. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of an imitation riveting tooling fixture proposed by the present invention;

[0030] Figure 2 It is a schematic structural diagram of the base in the present invention;

[0031] Figure 3 It is a schematic structural diagram of the riveting block in the present invention;

[0032] Figure 4 It is a perspective view of the riveting block in the present invention;

[0033] Figure 5 It is a flow chart of a detection method proposed by the present invention.

[0034] Legend Explanation:

[0035] 1. Base; 2. Riveting block; 3. Riveting point; 4. Stressed part; 5. Pressing rod. Detailed Embodiment

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Referring to Figures 1 - 5 , an embodiment provided by the present invention: A tooling fixture for imitating riveting pressure, comprising: a base 1; the inner side of the base 1 is a stepped through-hole, and a riveting block 2 is placed inside the base 1; several riveting points 3 are provided inside the riveting block 2, and the force-bearing part 4 is placed inside the riveting block 2 by cooperating with the riveting points 3; the upper part of the force-bearing part 4 cooperates with a pressing rod 5, and the strength of the force-bearing part 4 is detected by pressing down the pressing rod 5.

[0038] In this embodiment, the base 1 is a cylinder, and a stepped through-hole is provided inside. A riveting block 2 is placed inside the base 1. The height of the riveting block 2 is the same as the depth of the through-hole. After assembly, the upper end surface of the riveting block 2 and the upper end surface of the base 1 are on the same plane. Several riveting points 3 are provided on the inner wall of the riveting block 2, specifically six. By cooperating with the riveting points 3 and the force-bearing part 4, the force-bearing part 4 is clamped and installed inside the riveting block 2. The upper part of the force-bearing part 4 cooperates with the thinner side of the pressing rod 5. Press down the pressing rod 5 to apply a downward force to the force-bearing part 4, and monitor the displacement of the pressing rod 5 moving downward and the force change at different displacements. Within the strength range of the force, as the displacement increases, it is detected that the force on the force-bearing part 4 gradually increases. When it exceeds the force strength, the force-bearing part 4 is damaged or destroyed, and as the displacement increases, it is detected that the force on the force-bearing part 4 gradually decreases, forming a parabola, and its extreme value is the maximum value of the strength range of the force-bearing part 4.

[0039] The inner diameter of the base 1 and the outer diameter of the riveting block 2 are in clearance fit. A chamfer is provided inside the base 1. The riveting block 2 includes an extending section and a matching section. A slope is provided between the extending section and the matching section, and the chamfer and the slope have the same inclination angle.

[0040] The outer diameter of the riveting block 2 and the inner diameter of the base 1 are in clearance fit. Specifically, the matching section of the riveting block 2 and the inner diameter of the base 1 are in clearance fit. After placing the extending section of the riveting block 2 in the inner diameter of the base 1, by applying pressure to the upper surface of the riveting block 2, the matching section is pressed into the base 1. In this embodiment, a slope is provided between the extending section and the matching section, which is convenient for the matching section to be pressed into the base 1. The chamfer angle provided on the base 1 is the same as the degree of the slope, which can make the matching section more smoothly pressed into the base 1. In this embodiment, the degree of the slope and the chamfer is 15°.

[0041] Combined with the attached drawings, the number of riveting blocks 2 is at least two, and several riveting points 3 are arranged on the inner side of the riveting blocks 2 and are flush in position.

[0042] In this embodiment, the number of riveting blocks 2 is two, specifically two semi-cylindrical shapes, and there is an inclined surface in the middle. Several riveting points 3 are arranged on the inner side of the riveting blocks 2. Each inner side of the riveting blocks 2 is provided with 3 riveting points. The riveting points 3 are arranged at the same height on the inner side of the riveting blocks 2. By splicing the two riveting blocks 2, the riveting points 3 on the inner side squeeze and clamp the stressed part 4.

[0043] The stressed part 4 is circular ring-shaped, and an annular groove is formed on the outer side wall, and it is matched with the riveting points 3 through the annular groove.

[0044] In this embodiment, the stressed part 4 is circular ring-shaped, and an annular groove is formed at the side wall of its outer side. The annular groove is arranged in the middle of the stressed part 4 and is matched with the riveting points 3. After the matching, the upper end surface of the stressed part 4 is on the same horizontal plane as the upper end surface of the riveting block 2.

[0045] The pressing rod 5 is a stepped round rod. One side of the pressing rod 5 extends into the inner side of the stressed part 4 and has a clearance fit with the stressed part 4; grooves are formed on both end faces of the stressed part 4, and the grooves are in contact with the shoulders of the pressing rod 5.

[0046] In this embodiment, the slender end side of the pressing rod 5 is placed inside the stressed part 4, and the shoulder of the pressing rod 5 is in contact with the groove at the end face of the stressed part 4. By continuously applying a downward pressure through the pressing rod 5, the strength of the stressed part 4 is detected.

[0047] A through hole is provided below the base 1. The diameter of the pressing rod 5 is smaller than the diameter of the through hole, which can prevent the pressing rod 5 from having a large downward displacement during the continuous downward extrusion and transportation process due to the damage of the stressed part 4, and squeezing the base 1 to damage the base 1.

[0048] The density of the stressed part 4 is 6.4 g / cm 3 -6.5 g / cm 3 , the surface hardness is 55 - 70 HRF, and the internal riveting point compressive strength is greater than or equal to 5000 N.

[0049] In a specific embodiment, a control test is carried out by setting an imitation riveting tooling fixture and the assembled stressed part, and the results are shown in Table 1:

[0050]

[0051]

[0052] Table 1

[0053] By designing 10 sets of tooling fixtures and 10 sets of stressed parts after assembly, the maximum stress intensity of the stressed part 4 under the pressure of the pressing rod 5 is detected. From the detected data, it can be obtained from the data in Table 1 that the strength test of the stressed part 4 is basically the same as the strength test value after the stressed part 4 is assembled. This simulation fixture can replace the traditional detection method for gas spring assembly, which can not only save the gas spring assembly time but also reduce the waste of gas spring assemblies.

[0054] An embodiment of a detection method is also provided in the technical solution of the present invention. The detection method is used for the tooling fixture of any one of the above technical solutions, and includes:

[0055] S1: Select a suitable riveting block according to the riveting requirements, and match the riveting point inside the riveting block with the annular groove outside the stressed part;

[0056] S2: Place the extending section of the riveting block at the stepped through hole of the base, apply a certain pressure above the riveting block through a pressure testing machine, press the riveting block into the inner side of the base, and the riveting point clamps the stressed part;

[0057] S3: Take out the base, place the pressing rod above the stressed part, match it with the stressed part, and then put it into the pressure testing machine again. Continuously apply pressure to squeeze downward, and judge whether it is qualified by monitoring the displacement of the pressure testing machine block and the stress of the stressed part.

[0058] In this embodiment, a suitable riveting block 2 is selected according to the riveting requirements. The riveting block 2 determines the size, depth and inner diameter of the riveting point 3 according to the riveting requirements and the outer diameter of the stressed part 4. The riveting block 2 is spliced so that the riveting point 3 matches the annular groove of the stressed part 4 for preliminary clamping. Place the extending section of the riveting block 2 in the base 1, and squeeze the matching section of the riveting block 2 into the base 1 through a pressure testing machine to clamp the stressed part 4. After taking out the base 1, place the pressing rod 5 above the stressed part 4, match it with the stressed part, and then put it into the pressure testing machine again. Select a suitable pressing rod 5 according to the stress area on the surface of the stressed part 4 after assembly, and judge whether the strength of the stressed part 4 is qualified by monitoring the displacement of the pressure testing machine block and the stress of the stressed part 4.

[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tooling fixture for imitating riveting and pressing, characterized in that Comprising: Base (1); The inner side of the base (1) is a stepped through-hole, and a riveting block (2) is placed inside the base (1); Several riveting points (3) are provided inside the riveting block (2), and the force-bearing part (4) is placed inside the riveting block (2) by cooperating with the riveting points (3); Take out the base (1), the upper part of the force-bearing part (4) cooperates with a pressing rod (5), and the strength of the force-bearing part (4) is detected by pressing down the pressing rod (5); A chamfer is provided inside the base (1), the riveting block (2) includes an extending section and a cooperating section, and an inclined surface is provided between the extending section and the cooperating section, and the inclination angles of the chamfer and the inclined surface are the same.

2. The tooling fixture for imitating riveting pressing according to claim 1, characterized in that: The inner diameter of the base (1) and the outer diameter of the riveting block (2) are in clearance fit.

3. The fixture for imitating riveting and pressing according to claim 1, characterized in that: The number of the riveting blocks (2) is at least two, and several riveting points (3) are arranged inside the riveting blocks (2) and are flush in position.

4. The fixture for imitating riveting and pressing according to claim 1, wherein: The force-bearing part (4) is annular, and an annular groove is provided on the outer side wall, and the annular groove cooperates with the riveting points (3).

5. The fixture for imitating riveting press according to claim 1, wherein: The pressing rod (5) is a stepped round rod, and one side of the pressing rod (5) extends into the inner side of the force-bearing part (4) and is in clearance fit with the force-bearing part (4).

6. The fixture for imitating riveting and pressing according to claim 1, wherein: Grooves are provided on both end faces of the force-bearing part (4), and the grooves are in contact with the shoulders of the pressing rod (5).

7. An imitated riveting tooling fixture according to claim 1, characterized in that: A through-hole is provided below the base (1), and the diameter of the pressing rod (5) is smaller than the diameter of the through-hole.

8. The fixture for imitating riveting and pressing according to claim 1, characterized in that: The density of the force-bearing part (4) is 6.4 g / cm³ - 6.5 g / cm³, the surface hardness is 55 - 70 HRF, and the internal riveting point compressive strength is greater than or equal to 5000 N.

9. A detection method, characterized in that, The detection method is used for the tooling fixture described in any one of the above claims 1 - 8, and includes: S1: Select a suitable riveting block according to the riveting requirements, and cooperate the riveting points inside the riveting block with the annular groove on the outer side of the force-bearing part; S2: Place the extending section of the riveting block at the stepped through-hole of the base, and apply a certain pressure to the upper part of the riveting block through a pressure testing machine to press the riveting block into the inner side of the base, and the riveting points clamp the force-bearing part; S3: Take out the base, place the pressing rod above the force-bearing part, cooperate with the force-bearing part, and put it into the pressure testing machine again, continuously apply pressure to press downwards, and judge whether it is qualified by monitoring the displacement of the pressure testing machine pressing block and the force received by the force-bearing part.

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