A three-axis machining fixture for round-head press-fit screws

Abstract

This utility model discloses a three-axis machining fixture for round-head rivet screws, including a lifting plate and a clamping mechanism. The upper end of the lifting plate has a movable base plate, and a clamping block is slidably connected to the upper end of the base plate. Slide grooves are formed on both the front and rear sides of the base plate. The clamping mechanism includes a limiting plate, limiting posts, limiting grooves, a bidirectional lead screw, and a clamping assembly. The limiting plates are slidably connected inside the slide grooves, and the limiting posts are all located at the upper end of the limiting plates. The limiting grooves are respectively formed on the front and rear sides of the clamping block. The outer surfaces of the limiting posts are slidably connected to the inner walls of the vertically adjacent limiting grooves. The bidirectional lead screw is rotatably connected to the center of the base plate. This utility model, by providing a clamping mechanism, can simultaneously fix and release multiple round-head rivet screws of different diameters, realizing the three-axis machining of multiple round-head rivet screws, avoiding the need for multiple clamping and tool setting, and improving the machining efficiency of round-head rivet screws.

Description

Technical Field

[0001] This utility model relates to the field of precision machining technology for hardware parts, specifically a three-axis machining fixture for round-headed rivet screws. Background Technology

[0002] Round-head press-fit screws are fasteners used for connecting metal sheets. They are characterized by their round heads with a press-fit structure. During installation, a special tool is used to press the screw into a pre-drilled hole, causing the tail material to deform and expand, forming a strong riveting effect. These screws have advantages such as quick installation, no need for tapping, and shock resistance and anti-loosening properties. They are widely used in fields such as electronic equipment, automobile manufacturing, and aerospace to meet the fastening needs of thin sheet materials.

[0003] After cold heading, round head rivet screws require further machining to ensure consistent head dimensions. This necessitates the use of a three-axis machining fixture to hold the screw in place. Currently, most round head rivet screws are machined on a lathe, where the screw is fixed to a three-jaw chuck, and the cutting tool is moved to machine the head. However, traditional lathe machining only allows for one screw to be machined at a time, requiring frequent tool setting and resulting in low efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a three-axis machining fixture for round head rivet screws. It is equipped with a clamping mechanism that can simultaneously fix and release multiple round head rivet screws of different diameters, realize the three-axis machining of multiple round head rivet screws, avoid the occurrence of multiple clamping and tool setting, improve the machining efficiency of round head rivet screws, and effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a three-axis machining fixture for round-head press-fit screws, comprising a lifting plate, a PLC controller, and a clamping mechanism; Lifting plate: It has a movable base plate at its upper end, and a clamping block is slidably connected to the upper end of the base plate. Sliding grooves are opened on both the front and rear sides inside the base plate. The clamping mechanism includes a limiting plate, limiting posts, limiting grooves, a bidirectional lead screw, and a clamping assembly. The limiting plates are all slidably connected to the inside of the grooves. The limiting posts are all located at the upper end of the limiting plates. The limiting grooves are respectively opened on the front and rear sides inside the clamping block. The outer surfaces of the limiting posts are slidably connected to the inner walls of the vertically adjacent limiting grooves. The bidirectional lead screw is rotatably connected to the middle of the bottom plate. The middle of the inside of the limiting plates is threadedly connected to the outer surface of the bidirectional lead screw, providing a basis for the simultaneous fixing and release of multiple round-headed rivet screws. The clamping assembly is located at the upper end of the bottom plate.

[0006] Furthermore, the clamping assembly includes a mounting plate, sliding holes, sliding pillars, and recesses. The mounting plates are all located on the upper end of the base plate, the sliding pillars are all located on the side of the mounting plate near the clamping block, the sliding holes are all located on the side of the clamping block near the mounting plate, the outer surface of the sliding pillars is slidably connected to the inner wall of the vertically adjacent sliding holes, and the recesses are all located on the side of the clamping block away from the mounting plate, providing a foundation for fixing the round-headed rivet screws.

[0007] Furthermore, the clamping assembly also includes mounting grooves, positioning blocks, positioning holes, and fixing bolts. The mounting grooves are respectively opened on the left and right sides inside the base plate. The positioning blocks are all set inside the mounting grooves by fixing bolts. The positioning holes are evenly opened in the middle of the inside of the positioning blocks. The positioning holes are all laterally adjacent to the recesses, providing a basis for the initial positioning of the round-headed rivet screws.

[0008] Furthermore, the clamping mechanism also includes a motor, which is located in the middle of the rear side of the base plate. The input end of the motor is electrically connected to the output end of the PLC controller, and the front end of the output shaft of the motor is fixedly connected to the rear end of the bidirectional lead screw, providing a driving effect for fixing and releasing the round head rivet screw.

[0009] Furthermore, it also includes a linear module one, which is respectively set on the front and rear sides of the upper end of the lifting plate. A linear module two is provided between the connecting sliders of the two linear modules one. The upper end of the connecting slider of the linear module two is fixedly connected to the lower middle part of the base plate. The input ends of both linear modules one and linear module two are electrically connected to the output end of the PLC controller, providing a basis for the movement of the round head rivet screw in the X and Y axis directions.

[0010] Furthermore, it also includes a base, sleeves, inserts, and an electric push rod. The base is located at the lower end of the lifting plate, the sleeves are located at the four upper corners of the base, the inserts are located at the four lower corners of the lifting plate, and the outer surface of the inserts is slidably connected to the inner wall of the vertically adjacent sleeves. The electric push rod is located at the middle of the upper end of the base. The input end of the electric push rod is electrically connected to the output end of the PLC controller, and the upper end of the telescopic end of the electric push rod is fixedly connected to the middle of the lower end of the lifting plate, providing a basis for the Z-axis movement of the round-headed rivet screw.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The two-way lead screw drives the front and rear limit plates and limit posts to move synchronously, causing the limit posts to press against the corresponding limit grooves, thereby moving the clamping block. With the positioning of the positioning blocks with positioning holes of different diameters, multiple round head rivet screws of different diameters can be quickly and simultaneously fixed and released, realizing the three-axis machining of multiple round head rivet screws. This avoids the need for multiple clamping and tool setting, and improves the machining efficiency of round head rivet screws. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the clamping mechanism of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the sliding hole and sliding column of this utility model; Figure 4 This is a schematic diagram of the clamping mechanism of this utility model.

[0013] In the diagram: 1 Lifting plate, 2 Base plate, 3 Clamping block, 4 Slide groove, 5 Clamping mechanism, 51 Limiting plate, 52 Limiting post, 53 Limiting groove, 54 Clamping assembly, 541 Mounting plate, 542 Slide hole, 543 Slide column, 544 Notch, 545 Mounting groove, 546 Positioning block, 547 Positioning hole, 548 Fixing bolt, 55 Bidirectional lead screw, 56 Motor, 6 Linear module one, 7 Linear module two, 8 Base, 9 Sleeve, 10 Insert post, 11 Electric push rod, 12 PLC controller. Detailed Implementation

[0014] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 This embodiment provides a technical solution: a three-axis machining fixture for round head rivet screws, including a lifting plate 1, a PLC controller 12 and a clamping mechanism 5; the upper end of the lifting plate 1 is provided with a movable base plate 2, the upper end of the base plate 2 is slidably connected with a clamping block 3, and the front and rear sides of the base plate 2 are provided with sliding grooves 4.

[0016] The system also includes a linear module 6, which is located on the front and rear sides of the upper end of the lifting plate 1. A linear module 7 is provided between the connecting sliders of the two linear modules 6. The upper end of the connecting slider of the linear module 7 is fixedly connected to the lower middle part of the base plate 2. The input ends of both linear modules 6 and 7 are electrically connected to the output end of the PLC controller 12. Both linear modules 6 and 7 are common linear movement mechanisms in the prior art, used for the linear movement of round-headed rivet screws, providing a basis for the movement of round-headed rivet screws in the X and Y directions.

[0017] The system also includes a base 8, sleeves 9, inserts 10, and an electric push rod 11. The base 8 is located at the lower end of the lifting plate 1. The sleeves 9 are located at the four upper corners of the base 8. The inserts 10 are located at the four lower corners of the lifting plate 1. The outer surface of each insert 10 is slidably connected to the inner wall of the vertically adjacent sleeve 9. The electric push rod 11 is located at the middle of the upper end of the base 8. The input end of the electric push rod 11 is electrically connected to the output end of the PLC controller 12. The upper end of the telescopic end of the electric push rod 11 is fixedly connected to the middle of the lower end of the lifting plate 1. The sleeves 9 and inserts 10 provide a limiting effect for the up and down movement of the electric push rod 11. When the electric push rod 11 is working, the axial load is the main load, and the radial load is very small due to the limiting effect of the sleeves 9 and inserts 10, making it less prone to damage. This provides a basis for the movement of the round-headed rivet screw in the Z-axis direction.

[0018] The clamping mechanism 5 includes a limiting plate 51, limiting posts 52, limiting grooves 53, a bidirectional lead screw 55, and a clamping assembly 54. The limiting plates 51 are all slidably connected to the inside of the sliding groove 4. The limiting posts 52 are all located at the upper end of the limiting plates 51. The limiting grooves 53 are respectively opened on the front and rear sides inside the clamping block 3. Each limiting groove 53 is an inclined groove, and two longitudinally adjacent limiting grooves 53 are symmetrically distributed. The outer surface of each limiting post 52 is slidably connected to the inner wall of the vertically adjacent limiting groove 53. The bidirectional lead screw 55 is rotatably connected to the middle of the inside of the base plate 2. The middle of the inside of each limiting plate 51 is connected to the outer surface of the bidirectional lead screw 55. The threaded connection allows for the installation of a bellows between the inner wall of the slide groove 4 and the front and rear sides of the limiting plate 51. The bellows is fitted onto the outer surface of the bidirectional lead screw 55, providing a seal and protection for the bidirectional lead screw 55. This prevents the bidirectional lead screw 55 from being affected by the external environment and provides a basis for the simultaneous fixing and releasing of multiple round-head rivet screws. The clamping mechanism 5 also includes a motor 56, which is located in the middle of the rear side of the base plate 2. The input end of the motor 56 is electrically connected to the output end of the PLC controller 12, and the front end of the output shaft of the motor 56 is fixedly connected to the rear end of the bidirectional lead screw 55, providing a driving effect for the fixing and releasing of the round-head rivet screws.

[0019] The clamping assembly 54 is located on the upper end of the base plate 2. The clamping assembly 54 includes a mounting plate 541, sliding holes 542, sliding pillars 543, and recesses 544. The mounting plates 541 are all located on the upper end of the base plate 2. The sliding pillars 543 are all located on the side of the mounting plate 541 near the clamping block 3. The sliding holes 542 are all located on the side of the clamping block 3 near the mounting plate 541. The outer surface of the sliding pillars 543 is slidably connected to the inner wall of the vertically adjacent sliding holes 542. The recesses 544 are all located on the side of the clamping block 3 away from the mounting plate 541. The limiting grooves 53 in the two clamping blocks 3 corresponding to the recesses 544 are also symmetrically distributed. This provides a foundation for fixing the round-head press-fit screws. The clamping assembly 54 also includes a mounting groove 545, a positioning block 546, a positioning hole 547, and a fixing bolt 548. The mounting groove 545 is respectively opened on the left and right sides inside the base plate 2. The positioning blocks 546 are all set inside the mounting groove 545 by the fixing bolts 548. The positioning holes 547 are evenly opened in the middle of the inside of the positioning blocks 546. The positioning holes 547 are all laterally adjacent to the recesses 544. The positioning blocks 546 are replaceable. The diameter of the positioning holes 547 in different positioning blocks 546 is also different, providing a foundation for the initial positioning of the round-head press-fit screws.

[0020] The working principle of this utility model is as follows: When processing round head rivet screws, first fix the round head rivet screws, select a positioning block 546 whose diameter matches the diameter of the round head rivet screw, fix the positioning block 546 in the mounting groove 545 with fixing bolts 548, and insert the lower end of the round head rivet screw into the positioning hole 547 in sequence, so that the round head of the round head rivet screw faces upward. PLC controller 12 controls motor 56 to operate. The output shaft of motor 56 drives bidirectional lead screw 55 to rotate. As bidirectional lead screw 55 rotates, two limit plates 51 move inward simultaneously, and limit post 52 also moves accordingly. As limit post 52 moves, limit post 52 presses against the corresponding limit groove 53, causing the two clamping blocks 3 corresponding to recess 544 to move inward synchronously until the inner wall of recess 544 is in contact with the outer surface of round head rivet screw. Sliding hole 542 and sliding post 543 provide sliding limit for the movement of clamping block 3. At this time, all round head rivet screws are fixed at the same time, and then processing can be carried out. During processing, the PLC controller 12 controls the electric push rod 11, linear module 6 and linear module 7 to work. Linear module 6 can drive the round head rivet screw to move laterally along the X-axis, linear module 7 can drive the round head rivet screw to move longitudinally along the Y-axis, and electric push rod 11 can drive the round head rivet screw to move vertically along the Z-axis, thus realizing the three-axis processing of the round head rivet screw.

[0021] It is worth noting that the PLC controller 12 disclosed in the above embodiments is an ATMEGA2560-16AUPLC controller, the motor 56 is a DKM motor, the linear module 6 and the linear module 7 are both TKB136120C-600 linear modules, the electric actuator 11 is a JZN180 electric actuator, and the PLC controller 12 controls the operation of the electric actuator 11, the linear module 6 and the linear module 7 using methods commonly used in the prior art.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A three-axis machining fixture for round-head press-fit screws, characterized in that: It includes a lifting plate (1), a PLC controller (12), and a clamping mechanism (5); The upper end of the lifting plate (1) is provided with a movable base plate (2), and the upper end of the base plate (2) is slidably connected with a clamping block (3). Sliding grooves (4) are provided on both the front and rear sides inside the base plate (2). The clamping mechanism (5) includes a limiting plate (51), a limiting post (52), a limiting groove (53), a bidirectional lead screw (55), and a clamping assembly (54). The limiting plates (51) are all slidably connected to the inside of the sliding groove (4). The limiting posts (52) are all set at the upper end of the limiting plates (51). The limiting grooves (53) are respectively opened on the front and rear sides inside the clamping block (3). The outer surface of the limiting posts (52) is slidably connected to the inner wall of the vertically adjacent limiting groove (53). The bidirectional lead screw (55) is rotatably connected to the middle of the inside of the base plate (2). The middle of the inside of the limiting plates (51) is threadedly connected to the outer surface of the bidirectional lead screw (55). The clamping assembly (54) is set at the upper end of the base plate (2).

2. The three-axis machining fixture for a round-head press-fit screw according to claim 1, characterized in that: The clamping assembly (54) includes a mounting plate (541), sliding holes (542), sliding pillars (543), and recesses (544). The mounting plates (541) are all located on the upper end of the base plate (2). The sliding pillars (543) are all located on the side of the mounting plate (541) near the clamping block (3). The sliding holes (542) are all located on the side of the clamping block (3) near the mounting plate (541). The outer surface of the sliding pillars (543) is slidably connected to the inner wall of the vertically adjacent sliding holes (542). The recesses (544) are all located on the side of the clamping block (3) away from the mounting plate (541).

3. The three-axis machining fixture for a round-head press-fit screw according to claim 2, characterized in that: The clamping assembly (54) also includes a mounting groove (545), a positioning block (546), a positioning hole (547), and a fixing bolt (548). The mounting groove (545) is respectively opened on the left and right sides inside the base plate (2). The positioning blocks (546) are all set inside the mounting groove (545) by fixing bolts (548). The positioning holes (547) are evenly opened in the middle of the inside of the positioning blocks (546). The positioning holes (547) are all laterally adjacent to the recess (544).

4. The three-axis machining fixture for a round-head press-fit screw according to claim 1, characterized in that: The clamping mechanism (5) also includes a motor (56), which is located in the middle of the rear side of the base plate (2). The input end of the motor (56) is electrically connected to the output end of the PLC controller (12), and the front end of the output shaft of the motor (56) is fixedly connected to the rear end of the bidirectional lead screw (55).

5. The three-axis machining fixture for a round-head press-fit screw according to claim 1, characterized in that: It also includes a linear module one (6), which is respectively set on the front and rear sides of the upper end of the lifting plate (1). A linear module two (7) is provided between the connecting sliders of the two linear modules one (6). The upper end of the connecting slider of the linear module two (7) is fixedly connected to the lower middle part of the base plate (2). The input ends of both the linear module one (6) and the linear module two (7) are electrically connected to the output end of the PLC controller (12).

6. The three-axis machining fixture for a round-head press-fit screw according to claim 1, characterized in that: It also includes a base (8), sleeves (9), inserts (10) and electric push rods (11). The base (8) is located at the lower end of the lifting plate (1). The sleeves (9) are all located at the four corners of the upper end of the base (8). The inserts (10) are all located at the four corners of the lower end of the lifting plate (1). The outer surface of the inserts (10) is slidably connected to the inner wall of the vertically adjacent sleeves (9). The electric push rods (11) are located at the middle of the upper end of the base (8). The input end of the electric push rods (11) is electrically connected to the output end of the PLC controller (12). The upper end of the telescopic end of the electric push rods (11) is fixedly connected to the middle of the lower end of the lifting plate (1).

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