Floating positioning mechanism for nut single-point multi-time press riveting

Abstract

The utility model discloses a floating positioning mechanism for nut single-point multi-time press riveting, which relates to the technical field of press riveting and comprises a press riveting clamp body. An upper pressure head mechanism is mounted at the side end of the pressure riveting clamp body; a lower die holder is arranged below the upper pressure head mechanism at the side end of the pressure riveting clamp body; a workpiece is arranged at the top end of the lower die holder; when the hole position of the workpiece has deviation, the top end of the positioning pin is conical, the top of the positioning pin can firstly enter the positioning hole of the workpiece, and the position of the positioning pin is adjusted according to the deviation of the positioning hole, so that the lower die holder and the positioning slip ring are adjusted and changed together, and the positioning slip ring can move between the upper steel ball and the lower steel ball; the positioning slip ring can be changed and adjusted in the adjusting gap, so that the deviation condition of the alignment hole position is dealt with, the situation that the rivet and the hole position are not aligned accurately, pressing rivet deflection, uneven riveting force and even product scrapping are easily caused is avoided, the machine does not need to be stopped to adjust a tool or replace a die, and therefore the production efficiency is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of riveting technology, specifically to a floating positioning mechanism for single-point multiple riveting of nuts. Background Technology

[0002] Press riveting is a cold working process that achieves mechanical connection of metal parts through local plastic deformation. It is widely used in the assembly of sheet metal parts, automotive parts and electronic device housings. Its core principle is to use press riveting equipment to apply pressure to rivets or nuts, causing them to deform and form a firm connection with the substrate. It has the advantages of high efficiency, no heat-affected zone, and high structural strength, and can replace traditional welding or bolt connection methods.

[0003] Existing riveting processes typically use fixed fixtures or locating pins to clamp and position the product, and use the vertical punching force of the riveting head to press the rivet or nut into the preset hole. The specific process is as follows: first, the product to be processed is placed in the positioning groove of the mold and fixed by mechanical or pneumatic clamps, and then the riveting head is driven to press down along a predetermined trajectory, so that the rivet and the substrate are deformed and engaged.

[0004] In existing technologies, the positioning mechanism of the riveting fixture is mostly a rigid design, which cannot adapt to the positional deviation of the nut positioning hole of the product. When the hole position shifts due to product size fluctuations, the rivet and hole position are misaligned, which can easily lead to riveting skew, uneven riveting force, or even product scrap. At this time, it is necessary to stop the machine to adjust the fixture or replace the mold. The operation is cumbersome and heavily relies on manual experience, resulting in reduced production efficiency and increased costs, making it difficult to meet the needs of flexible production. Utility Model Content

[0005] The purpose of this utility model is to provide a floating positioning mechanism for single-point multiple riveting of nuts, so as to solve the technical problem in the prior art that when the hole position is offset due to product size fluctuation, the rivet and hole position are misaligned, which can easily lead to riveting skew, uneven riveting force or even product scrapping. At this time, it is necessary to stop the machine to adjust the tooling or replace the mold, which is cumbersome and heavily dependent on manual experience, resulting in reduced production efficiency.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] A floating positioning mechanism for single-point multiple riveting of nuts includes a riveting clamp body; an upper pressure head mechanism is installed on the side end of the riveting clamp body; a lower die base is provided below the upper pressure head mechanism on the side end of the riveting clamp body; a workpiece is provided at the top of the lower die base; a positioning slip ring is connected to the bottom end of the lower die base; a piston rod is slidably connected inside the positioning slip ring; a positioning pin is fixedly connected to the top end of the piston rod; and an adaptive unit is provided below the lower die base.

[0008] As a further embodiment of this utility model: the self-adaptive unit includes a positioning slip ring; the positioning slip ring is installed at the bottom end of the lower mold base; an upper retainer is installed at the top end of the positioning slip ring; an upper steel ball is rotatably connected inside the upper retainer; a lower retainer is installed at the bottom end of the positioning slip ring; a lower steel ball is rotatably connected inside the lower retainer; and an adjustment gap is provided between the positioning slip ring and the upper retainer.

[0009] As a further embodiment of this utility model: a sealing ring is provided inside the lower mold base; the sealing ring is fixedly connected to the inside of the piston rod.

[0010] The beneficial effects of this utility model are as follows: When there is a deviation in the position of the hole in the workpiece, the top of the positioning pin is conical. The top of the positioning pin can first enter the positioning hole of the workpiece. The position of the positioning pin is adjusted according to the deviation of the positioning hole, so that the lower mold base and the positioning slip ring can be adjusted together. The positioning slip ring can move between the upper and lower steel balls. The positioning slip ring can be adjusted within the adjustment gap to deal with the deviation in the position of the alignment hole, avoid misalignment between the rivet and the hole, which can easily lead to crooked riveting, uneven riveting force, or even product scrapping. It also eliminates the need to stop the machine to adjust the tooling or replace the mold, thus ensuring production efficiency. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the lower mold base structure of this utility model;

[0014] In the diagram: 1. Press clamp body; 2. Upper press head mechanism; 3. Workpiece; 5. Lower die base; 6. Piston rod; 7. Positioning pin; 8. Upper retainer; 9. Lower retainer; 10. Upper steel ball; 11. Lower steel ball; 12. Positioning slip ring; 13. Adjusting clearance; 14. Sealing ring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figures 1-2As shown, a floating positioning mechanism for single-point multiple riveting of a nut includes a riveting clamp body 1; an upper pressure head mechanism 2 is installed on the side end of the riveting clamp body 1; a lower die base 5 is provided below the upper pressure head mechanism 2 on the side end of the riveting clamp body 1; a workpiece 3 is provided at the top of the lower die base 5; a positioning slip ring 12 is connected to the bottom end of the lower die base 5; a piston rod 6 is slidably connected inside the positioning slip ring 12; a positioning pin 7 is fixedly connected to the top end of the piston rod 6; and an adaptive unit is provided below the lower die base 5.

[0017] During operation, workpiece 3 is placed on the lower mold base 5, and the upper pressure head mechanism 2 is used to fix the nut on workpiece 3 for riveting. However, there is a deviation in the position of the positioning hole of workpiece 3, which causes the nut to not be accurately installed with workpiece 3. After workpiece 3 is placed on the lower mold base 5, the lower mold base 5 is activated to make the piston rod 6 and the positioning pin 7 slide to position the hole of workpiece 3. When there is a deviation in the position of the hole of workpiece 3, the top of the positioning pin 7 is conical. The top of the positioning pin 7 can first enter the positioning hole of workpiece 3. The position of the positioning pin 7 is adjusted according to the deviation of the positioning hole, so that the lower mold base 5 and the positioning slip ring 12 are adjusted together. The positioning slip ring 12 can move between the upper steel ball 10 and the lower steel ball 11. The positioning slip ring 12 can be adjusted within the adjustment gap 13 to deal with the deviation of the positioning hole position, avoid misalignment of the rivet and the hole, which can easily cause riveting skew, uneven riveting force or even product scrapping. It also eliminates the need to stop the machine to adjust the tooling or replace the mold, thus ensuring production efficiency.

[0018] The self-adaptive unit includes a positioning slip ring 12; the positioning slip ring 12 is installed at the bottom end of the lower mold base 5; an upper retainer 8 is installed at the top end of the positioning slip ring 12; an upper steel ball 10 is rotatably connected inside the upper retainer 8; a lower retainer 9 is installed at the bottom end of the positioning slip ring 12; a lower steel ball 11 is rotatably connected inside the lower retainer 9; and an adjustment gap 13 is provided between the positioning slip ring 12 and the upper retainer 8.

[0019] The top of the positioning pin 7 is tapered. The top of the positioning pin 7 can first enter the positioning hole of the workpiece 3. The position of the positioning pin 7 can be adjusted according to the deviation of the positioning hole, so that the lower mold base 5 and the positioning slip ring 12 can be adjusted together. The positioning slip ring 12 can move between the upper steel ball 10 and the lower steel ball 11. The positioning slip ring 12 can be adjusted within the adjustment gap 13 to cope with the deviation of the alignment hole position. The upper retainer 8 can limit the position of the upper steel ball 10, and the lower retainer 9 can limit the position of the lower steel ball 11. The upper retainer 8 and the lower retainer 9 are provided with multiple sets of upper steel balls 10 and lower steel balls 11. The multiple sets of upper steel balls 10 and lower steel balls 11 facilitate the position adjustment of the lower mold base 5.

[0020] The lower mold base 5 is provided with a sealing ring 14 inside; the sealing ring 14 is fixed to the inside of the piston rod 6.

[0021] The sliding of piston rod 6 and locating pin 7 is achieved through floating. The sealing ring 14 ensures the sealing between piston rod 6 and lower mold base 5, ensuring the operation of air pressure or hydraulic pressure, thereby ensuring the normal operation of piston rod 6 and locating pin 7.

[0022] The working principle of this utility model is as follows: During operation, the workpiece 3 is placed on the lower mold base 5, and the upper pressure head mechanism 2 is used to fix the nut on the workpiece 3 for the riveting process. However, there is a deviation in the position of the positioning hole of the workpiece 3, which causes the nut to not be accurately installed with the workpiece 3. After the workpiece 3 is placed on the lower mold base 5, the lower mold base 5 is activated to make the piston rod 6 and the positioning pin 7 slide to position the hole of the workpiece 3. When there is a deviation in the position of the hole of the workpiece 3, the top of the positioning pin 7 is conical, and the top of the positioning pin 7 can first enter the positioning hole of the workpiece 3. The position of the positioning pin 7 is adjusted according to the deviation of the positioning hole, so that the lower mold base 5 and the positioning slip ring 12 are adjusted together. The positioning slip ring 12 can move between the upper steel ball 10 and the lower steel ball 11, and the positioning slip ring 12 can adjust the gap. The internal adjustment of 13 can accommodate deviations in the alignment hole position, preventing misalignment between the rivet and the hole, which can easily lead to crooked riveting, uneven riveting force, or even product scrap. It also eliminates the need to stop the machine to adjust the tooling or replace the mold, thus ensuring production efficiency. The upper retainer 8 can limit the position of the upper steel ball 10, and the lower retainer 9 can limit the position of the lower steel ball 11. The upper retainer 8 and the lower retainer 9 have multiple sets of upper steel balls 10 and lower steel balls 11 inside, which facilitates the position adjustment of the lower mold base 5. The sliding of the piston rod 6 and the positioning pin 7 is achieved by floating. The sealing ring 14 can ensure the sealing of the piston rod 6 and the lower mold base 5, ensuring the operation of air pressure or hydraulic pressure, thereby ensuring the normal operation of the piston rod 6 and the positioning pin 7.

[0023] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A floating positioning mechanism for nut single-point multi-time press riveting, characterized in that, The device includes a riveting clamp body (1); an upper pressure head mechanism (2) is installed on the side end of the riveting clamp body (1); a lower die base (5) is provided below the upper pressure head mechanism (2) on the side end of the riveting clamp body (1); a workpiece (3) is provided at the top of the lower die base (5); a positioning slip ring (12) is connected to the bottom end of the lower die base (5); a piston rod (6) is slidably connected inside the positioning slip ring (12); a positioning pin (7) is fixedly connected to the top end of the piston rod (6); and an adaptive unit is provided below the lower die base (5).

2. The floating positioning mechanism for single-point multi-time press riveting of a nut according to claim 1, characterized in that, The self-adaptive unit includes a positioning slip ring (12); the positioning slip ring (12) is installed at the bottom end of the lower mold base (5); an upper retainer (8) is installed at the top end of the positioning slip ring (12); an upper steel ball (10) is rotatably connected inside the upper retainer (8); a lower retainer (9) is installed at the bottom end of the positioning slip ring (12); a lower steel ball (11) is rotatably connected inside the lower retainer (9); an adjustment gap (13) is provided between the positioning slip ring (12) and the upper retainer (8).

3. The floating positioning mechanism for single-point multi-time press riveting of a nut according to claim 1, characterized in that, The lower mold base (5) is provided with a sealing ring (14); the sealing ring (14) is fixed to the inside of the piston rod (6).

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