Automatic tapping device for hardware fitting machining

Abstract

The invention relates to the field of hardware fitting machining, in particular to an automatic tapping device for hardware fitting machining, which comprises a machine body and a worktable fixedly mounted on the machine body and used for bearing a hexagon nut, and further comprises a main shaft mounted on the machine body in a sliding manner; the triangular positioning and locking unit is arranged between the workbench and the main shaft and comprises a positioning assembly used for clamping and fixing a hexagonal screw and a locking assembly used for locking the positioning assembly; through the linkage design of the triangular positioning and locking unit and the main shaft, automatic linkage of the whole process from nut placement to machining completion is achieved, and extremely high machining quality is ensured through three-point synchronous centering and double rigid locking; in the positioning stage, the three clamping blocks are attached to the corner of the nut from three directions, and rapid centering is achieved; in the locking stage, the locking pin is connected with the locking frame in an inserted mode, radial positioning and locking are completed, and meanwhile vertical downward stable pressing force can be applied to the nut through elastic pressing.

Description

Technical Field

[0001] This invention relates to the field of hardware parts processing, and in particular to an automated tapping device for hardware parts processing. Background Technology

[0002] Nuts are core connecting components widely used in hardware accessories, and the machining accuracy of their internal threads directly determines the assembly reliability and service life of the final product. Currently, when tapping nuts, the workpiece is first placed in a preset position on the worktable. Then, the operator adjusts the three-jaw chuck to clamp the nut radially. Once the nut is properly positioned and clamped, the spindle drives the tapping drill bit to rotate and feed downwards, machining the internal thread of the pre-drilled hole in the nut. After machining, the three-jaw chuck is adjusted in the reverse direction to release the workpiece, completing one machining cycle. However, the current tapping method still presents certain technical challenges when machining larger nuts.

[0003] First, the three-jaw chuck requires independent manual adjustment of the clamping stroke, which is cumbersome. Furthermore, large hexagonal nuts are bulky and heavy, and the radial single-point / line contact clamping method used by the three-jaw chuck easily leads to uneven force during centering, causing coaxiality deviation between the nut's pre-drilled hole and the tapping drill bit. This ultimately results in thread tilting and incomplete tooth profile, severely affecting the fit accuracy of the nut and bolt. Second, the cutting force is significantly large during tapping of large hexagonal nuts, and the three-jaw chuck lacks a secondary locking mechanism, making it difficult to withstand the impact of cutting forces during processing. This easily leads to micro-vibration and loosening of the nut during machining, further affecting the stability of machining quality. Summary of the Invention

[0004] In view of the problem that the radial single-point / line contact clamping method used to fix the hexagonal nut in the above or existing technology is prone to uneven force during the centering process, which in turn causes the coaxiality deviation between the pre-drilled hole of the nut and the tapping drill bit, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide an automated tapping device for processing hardware accessories.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An automated tapping device for processing hardware parts includes a body and a worktable fixedly mounted on the body for carrying hexagonal nuts, and further includes...

[0008] A spindle that is slidably mounted on the machine body;

[0009] A triangular positioning and locking unit is disposed between the worktable and the spindle, the triangular positioning and locking unit comprising:

[0010] A positioning component for clamping and fixing hexagonal screws and a locking component for locking the positioning component;

[0011] The control component is used to first drive the positioning component to clamp the three corners of the hexagonal nut to achieve centering and positioning as the spindle moves, and form a triangular positioning structure. Then, it drives the locking component to lock and fix the positioning component that has formed the triangular positioning structure, thus forming a triangular positioning and locking structure.

[0012] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, the positioning component includes three mounting seats fixedly installed on the workbench, a plurality of return springs fixedly installed on the mounting seats, and a moving plate being installed at the ends of the plurality of return springs.

[0013] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, wherein: a plurality of sliding rods that slide through the mounting base are fixedly installed on the side of the moving plate near the mounting base, the return spring is sleeved on the outside of the corresponding sliding rod, and a clamping block is installed at the end of the plurality of sliding rods.

[0014] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, the control component includes a mounting ring fixedly installed on the outside of the spindle, and a plurality of strong springs are fixedly installed on the side of the mounting ring near the worktable, and a tripod is installed at the ends of the plurality of strong springs.

[0015] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, three wedge-shaped rods are fixedly installed on the outside of the tripod, and the three wedge-shaped rods respectively cooperate with the corresponding moving plate wedge-shaped. Several limiting rods that slide through the mounting ring are fixedly installed on the side of the tripod near the mounting ring, and the strong spring is sleeved on the outside of the corresponding limiting rod.

[0016] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, the locking assembly includes a fixing rod fixedly installed on the side of the clamp block away from the worktable, and a locking frame is fixedly installed at the end of the fixing rod.

[0017] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, wherein: the locking frame is provided with a locking groove, the three locking frames are connected to each other to form a triangular positioning structure when the positioning bolt is in place, and the corresponding locking grooves on the three locking frames are aligned with each other.

[0018] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, the tripod is fixedly installed with three locking pins on the side near the worktable, and the three locking pins respectively cooperate with the corresponding locking grooves.

[0019] As a preferred embodiment of the automated tapping device for hardware parts processing of the present invention, wherein: a tapping drill bit is fixedly installed at one end of the spindle near the worktable, and the axis of the spindle coincides with the positioning center of the positioning component.

[0020] The advantages of the automated tapping device for hardware parts processing of the present invention are as follows: Through the linkage design of the triangular positioning locking unit and the spindle, the entire process from placing the nut to completing the processing is automated and linked. Furthermore, through three-point synchronous centering and double rigid locking, extremely high processing quality is ensured. In the positioning stage, three clamping blocks fit against the corners of the nut from three directions, achieving rapid centering and effectively ensuring the coaxiality of the threaded hole and the spindle axis. In the locking stage, the locking pin inserts into the locking frame to complete radial positioning and locking, while also applying a stable vertical downward clamping force to the nut through elastic compression, forming a double fixation combining radial and axial forces. This robust locking structure can fully resist the huge cutting force and vibration generated when tapping large nuts, fundamentally eliminating the risk of workpiece vibration and loosening during processing, thereby significantly improving the processing accuracy of the nut. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the body, worktable, and triangular positioning and locking unit of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the mounting ring, strong spring, tripod, and wedge rod of the present invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the fixing rod, locking bracket, and locking groove of the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of the mounting base, reset spring, and movable plate of the present invention.

[0027] In the diagram: 1. Machine body; 2. Hexagonal nut; 3. Worktable; 4. Triangular positioning and locking unit; 41. Positioning assembly; 411. Mounting base; 412. Return spring; 413. Moving plate; 414. Slide rod; 415. Clamping block; 42. Control assembly; 421. Mounting ring; 422. Strong spring; 423. Triangular frame; 424. Wedge rod; 425. Limiting rod; 43. Locking assembly; 431. Fixing rod; 432. Locking frame; 433. Locking groove; 434. Locking pin; 5. Spindle; 6. Tapping drill bit. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1 and Figure 2 This embodiment provides an automated tapping device for processing hardware accessories, which can achieve a dual fixing effect of radial and axial combination for hexagonal nuts 2. It includes a body 1 and a worktable 3 fixedly installed on the body 1 for supporting the hexagonal nuts 2; a spindle 5 slidably installed on the body 1; a triangular positioning and locking unit 4 disposed between the worktable 3 and the spindle 5. The triangular positioning and locking unit 4 includes a positioning component 41 for clamping and fixing the hexagonal nut and a locking component 43 for locking the positioning component 41; and a control component 42. The control component 42 is used to drive the positioning component 41 to clamp the three corners of the hexagonal nut 2 to achieve centering and positioning as the spindle 5 moves, and then drive the locking component 43 to lock and fix the positioning component 41 that has formed the triangular positioning structure, thus forming a triangular positioning and locking structure.

[0030] Reference Figure 1 , Figure 2 and Figure 3 A tapping drill bit 6 is fixedly installed at one end of the spindle 5 near the worktable 3, and the axis of the spindle 5 coincides with the positioning center of the positioning component 41.

[0031] It should be noted that the core components of the machine body 1 include the frame, the spindle 5 drive module, and the control box. The frame provides the mounting base for the worktable 3, the spindle 5, and the triangular positioning and locking unit 4. The spindle 5 drive module has a built-in power source and transmission mechanism to drive the spindle 5 to achieve axial lifting and lowering movement. The control box has a built-in control circuit and program. The above-mentioned composition structure and working principle of the machine body 1 are all existing technologies, so they will not be described in detail in this application.

[0032] In practical use, the operator places the nut to be processed stably on the bearing area of ​​the worktable 3, and starts the processing program through the control box of the machine body 1. After receiving the instruction from the control box, the spindle 5 drive module drives the spindle 5 to move smoothly downward towards the worktable 3. The control component 42, which is fixedly connected to the spindle 5, moves synchronously. As the spindle 5 continues to move downward, the control component 42 first interacts with the positioning component 41, driving the positioning component 41 to converge towards the center, clamping the three corners of the hexagonal nut 2. Under the balanced force, the nut is automatically aligned to the center of the worktable 3, forming a stable triangular positioning structure. The axis of the spindle 5 and the positioning center of the positioning component 41 are pre-designed to coincide, thus directly ensuring that the pre-drilled hole of the nut and the tapping drill bit 6 are on the same axis, laying the foundation for subsequent tapping.

[0033] After positioning, the spindle 5 continues to feed towards the worktable 3. The control component 42 then drives the locking component 43 to rigidly lock the centered positioning component 41, firmly fixing the positioning state and forming a triangular positioning locking structure. This prevents the positioning component 41 from shifting due to force during processing, thus greatly improving the processing stability of the hexagonal nut 2. After locking, the control box triggers the spindle 5 to rotate. The tapping drill bit 6 rotates at a stable speed while continuously feeding into the pre-drilled hole of the nut along the spindle 5, cutting the internal thread along the preset axis. After processing, the spindle 5 drive module drives the spindle 5 to reset upwards. The control component 42 retracts synchronously, the locking component 43 unlocks, and the positioning component 41 returns to its initial open state. The operator can then remove the finished nut, completing a single processing cycle.

[0034] Reference Figure 2 , Figure 4 and Figure 5 The positioning component 41 includes three mounting bases 411 fixedly installed on the workbench 3. Several return springs 412 are fixedly installed on the mounting bases 411, and a moving plate 413 is installed at the ends of the several return springs 412.

[0035] Reference Figure 2 , Figure 4 and Figure 5 The movable plate 413 is fixedly installed with a plurality of sliding rods 414 that slide through the mounting base 411 on the side near the mounting base 411. The reset spring 412 is sleeved on the outside of the corresponding sliding rod 414. The ends of the plurality of sliding rods 414 are jointly installed with a clamping block 415.

[0036] It should be noted that the three mounting bases 411 are evenly distributed around the circumference of the worktable 3 to ensure a balanced clamping force on the three corners of the hexagonal nut 2; the slide bar 414 can guide the movement of the moving plate 413, preventing the clamping block 415 from shifting or tilting during the movement, thereby improving the centering accuracy; the return spring 412 can automatically pull the moving plate 413 and the clamping block 415 back to their original positions after processing and when the positioning is released, realizing the quick unlocking of the hexagonal nut 2; the clamping surface of the clamping block 415 adopts a fitting design that is adapted to the corners of the hexagonal nut 2 to form a surface contact clamping, which can effectively disperse the clamping force and improve the positioning stability compared with the point / line contact of the existing three-jaw chuck.

[0037] Reference Figure 2 , Figure 3 and Figure 4 The control component 42 includes a mounting ring 421 fixedly installed on the outside of the spindle 5. Several strong springs 422 are fixedly installed on the side of the mounting ring 421 near the worktable 3. The ends of the several strong springs 422 are jointly installed with a tripod 423.

[0038] Reference Figure 2 , Figure 3 and Figure 4 Three wedge-shaped rods 424 are fixedly installed on the outside of the tripod 423. The three wedge-shaped rods 424 respectively engage with the corresponding moving plate 413 in a wedge shape. Several limiting rods 425 that slide through the mounting ring 421 are fixedly installed on the side of the tripod 423 near the mounting ring 421. The strong spring 422 is sleeved on the outside of the corresponding limiting rod 425.

[0039] It should be noted that the mounting ring 421 drives the control component 42 to move synchronously with the axial movement of the spindle 5, without the need for additional programming control or power input. This achieves linkage between the positioning action and the movement of the spindle 5, solving the cumbersome problem of separate operation for positioning and tapping in existing three-jaw chucks. The strong spring 422 can push the tripod 423 to reset when the positioning is released after machining is completed. The wedge-shaped rod 424 and the wedge-shaped engagement with the moving plate 413 can convert the axial downward force of the spindle 5 into the radial inward clamping force of the positioning component 41. Through the inclined plane transmission principle, the three clamping blocks 415 are synchronously gathered and centered without manual adjustment, improving positioning efficiency and consistency.

[0040] Reference Figure 2 , Figure 3 and Figure 4 The locking assembly 43 includes a fixing rod 431 fixedly installed on the side of the clamping block 415 away from the worktable 3, and a locking frame 432 fixedly installed at the end of the fixing rod 431; the locking frame 432 is provided with a locking groove 433, and the three locking frames 432 are connected to each other to form a triangular positioning structure when the positioning bolt is used, and the corresponding locking grooves 433 on the three locking frames 432 are aligned with each other.

[0041] Reference Figure 2 , Figure 3 and Figure 4 The tripod 423 is fixedly installed with three locking pins 434 on the side near the workbench 3, and the three locking pins 434 respectively cooperate with the corresponding locking grooves 433.

[0042] It should be noted that the locking bracket 432 moves synchronously with the clamping block 415. When the positioning component 41 completes the centering and clamping of the hexagonal nut 2, the three locking brackets 432 simultaneously connect to form a triangular locking frame corresponding to the positioning structure, achieving precise connection between positioning and locking. The rigid insertion of the locking pin 434 locks and fixes the triangular locking frame, achieving radial locking of the positioning component 41 and preventing displacement after positioning. On the other hand, the end of the locking pin 434 is designed as a flat structure that fits the upper surface of the hexagonal nut 2. After the locking slot 433 is inserted, the spindle 5 continues to move downward, causing the end of the locking pin 434 to abut against the upper surface of the hexagonal nut 2. Then, as the spindle 5 continues to move downward, the strong spring 422 is compressed and generates a continuous elastic downward pressure, which is transmitted to the locking pin 434 through the tripod 423. This causes the locking pin 434 to apply a stable vertical clamping force to the hexagonal nut 2, forming a dual fixing structure of radial centering clamping and vertical downward clamping. This completely solves the problem of existing three-jaw chucks being able to only clamp radially and unable to resist the micro-vibration and loosening caused by axial cutting force.

[0043] In practical use, when the spindle 5 begins to move downward, the mounting ring 421 drives the entire control assembly 42 to descend together. As the mounting ring 421 descends, the inclined surface of the wedge rod 424 on the tripod 423 contacts the moving plate 413. As the spindle 5 continues to descend, the inclined surface of the wedge rod 424 converts the axial downward force into a radial inward thrust, overcoming the resistance of the return spring 412. This causes the moving plate 413 to push the slide rod 414, which in turn moves the clamping block 415, causing the three clamping blocks 415 to converge towards the center synchronously. This continues until the three corners of the hexagonal nut 2 placed on the worktable 3 are clamped together from three directions. Under the balanced force, the nut is automatically corrected to the center of the worktable 3, forming a stable triangular positioning structure.

[0044] After the positioning action is completed, the spindle 5 continues to feed downwards, thereby driving the mounting ring 421 and the tripod 423 to continue moving downwards. The downward movement of the tripod 423 causes the three locking pins 434 to descend accordingly, and then insert them into the locking grooves 433 of the three locking brackets 432 that have moved into place with the clamping block 415 and formed a triangular frame, thus achieving insertion. The insertion action radially and rigidly locks the entire positioning assembly 41, preventing it from retracting or wobbling under cutting force. Then the tripod 423 continues to move downwards until the locking pins 434... The end of 34 abuts against the upper surface of the hexagonal nut 2. At this time, the spindle 5 continues to move downward, which will cause the mounting ring 421 to compress the strong spring 422, thereby applying a vertically downward stable clamping force to the nut through the locking pin 434. Thus, the nut is completely fixed in the double rigid locking structure composed of radial centering clamping and vertical axial clamping. At the same time, the spindle 5 continues to move downward, which will also cause the rotating tapping drill bit 6 to continuously feed into the pre-made hole of the nut along the spindle 5 and cut the internal thread along the preset axis to perform tapping.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automated tapping device for processing hardware accessories, comprising a body (1) and a worktable (3) fixedly mounted on the body (1) for carrying hexagonal nuts (2), characterized in that, It also includes, The main shaft (5) is slidably mounted on the machine body (1); A triangular positioning and locking unit (4) is disposed between the worktable (3) and the spindle (5). The triangular positioning and locking unit (4) includes, A positioning assembly (41) for clamping and fixing the hexagonal screw and a locking assembly (43) for locking the positioning assembly (41). The control component (42) is used to drive the positioning component (41) to clamp the three corners of the hexagonal nut (2) to achieve centering and positioning as the spindle (5) moves, and to form a triangular positioning structure. Then, the locking component (43) is driven to lock and fix the positioning component (41) that has formed a triangular positioning structure, thus forming a triangular positioning and locking structure.

2. The automated tapping device for hardware parts processing as described in claim 1, characterized in that: The positioning component (41) includes three mounting bases (411) fixedly installed on the workbench (3). Several return springs (412) are fixedly installed on the mounting bases (411), and a moving plate (413) is installed at the ends of the several return springs (412).

3. The automated tapping device for hardware parts processing as described in claim 2, characterized in that: The movable plate (413) is fixedly installed with several sliding rods (414) that slide through the mounting base (411) on the side near the mounting base (411). The reset spring (412) is sleeved on the outside of the corresponding sliding rod (414). The ends of the several sliding rods (414) are jointly installed with a clamping block (415).

4. The automated tapping device for hardware parts processing as described in claim 3, characterized in that: The control component (42) includes a mounting ring (421) fixedly installed on the outside of the spindle (5). Several strong springs (422) are fixedly installed on the side of the mounting ring (421) near the worktable (3). A tripod (423) is installed at the end of the several strong springs (422).

5. The automated tapping device for processing hardware accessories as described in claim 4, characterized in that: Three wedge rods (424) are fixedly installed on the outside of the tripod (423). The three wedge rods (424) are respectively wedge-shaped and engaged with the corresponding moving plate (413). Several limiting rods (425) that slide through the mounting ring (421) are fixedly installed on the side of the tripod (423) near the mounting ring (421). The strong spring (422) is sleeved on the outside of the corresponding limiting rod (425).

6. The automated tapping device for processing hardware accessories as described in claim 5, characterized in that: The locking assembly (43) includes a fixing rod (431) fixedly installed on the side of the clamping block (415) away from the worktable (3), and a locking bracket (432) is fixedly installed at the end of the fixing rod (431).

7. The automated tapping device for processing hardware accessories as described in claim 6, characterized in that: The locking bracket (432) is provided with a locking groove (433). The three locking brackets (432) are connected to each other to form a triangular positioning structure when the positioning bolt is in place, and the corresponding locking grooves (433) on the three locking brackets (432) are aligned with each other.

8. The automated tapping device for processing hardware accessories as described in claim 7, characterized in that: The tripod (423) is fixedly installed with three locking pins (434) on the side near the workbench (3), and the three locking pins (434) are respectively engaged with the corresponding locking grooves (433).

9. The automated tapping device for processing hardware accessories as described in claim 8, characterized in that: A tapping drill bit (6) is fixedly installed on one end of the spindle (5) near the worktable (3), and the axis of the spindle (5) coincides with the positioning center of the positioning component (41).

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