Bolt thread rolling machining device and machining method thereof

Abstract

The invention discloses a bolt thread rolling machining device which comprises a thread rolling machine body. The adjusting mechanism is mounted in the thread rolling machine body and used for adjusting the position of a workpiece; the thread rolling device is detachably mounted in the thread rolling machine body through a dismounting and mounting mechanism; the reset mechanism is connected with the thread rolling device and drives the thread rolling device to reciprocate; the transmission mechanism is mounted on the adjusting mechanism and used for conveying the bolts to be machined; and the transmission mechanism drives the bolt to rotate. According to the quick die changing device, die changing is quick, the inserting plate and the inserting groove are matched in an inserting mode, guiding and limiting of the trapezoidal sliding block are combined, and fastening is conducted through the bolt, so that the thread rolling device is convenient and quick to disassemble and assemble; high-precision positioning and stable machining are achieved, specifically, a lead screw threaded sleeve block is matched with a third sliding block / sliding rail to provide precise translation driving; the combination of the elastic piece and the ball effectively absorbs vibration and reduces friction, and the second sliding block / sliding rail is matched, so that the moving stability and the positioning precision of the extrusion plate are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of processing device, in particular to a bolt thread rolling processing device and a processing method thereof. BACKGROUND

[0002] The bolt is a very common metal connecting piece, which is made of metal bar as raw material, and sequentially passes through steps of fixed-length cutting, end head upsetting forming, surface shot blasting and thread rolling processing, wherein the thread rolling processing is completed by a thread rolling machine.

[0003] At present, the bolt thread rolling machine on the market needs to manually put the bolt blank between two thread rolling plates during use, and the thread rolling processing on the surface of the bolt blank is completed by moving one thread rolling plate relative to the other thread rolling plate through a power device.

[0004] The existing thread rolling machine is usually only suitable for bolts with a limited diameter range, and the module needs to be replaced as a whole when switching products, and the operation is complicated when the bolt specification is replaced.

[0005] Therefore, we propose a bolt thread rolling processing device and a processing method thereof to solve the above problems. SUMMARY

[0006] The present application proposes the following technical solutions to solve the problems in the prior art:

[0007] The bolt thread rolling processing device comprises:

[0008] A thread rolling machine body;

[0009] An adjusting mechanism installed in the thread rolling machine body for adjusting the position of a workpiece;

[0010] A thread rolling device detachably installed in the thread rolling machine body through a dismounting mechanism;

[0011] A reset mechanism connected to the thread rolling device for driving reciprocating movement thereof;

[0012] A transmission mechanism installed on the adjusting mechanism for conveying a bolt to be processed;

[0013] The transmission mechanism drives the bolt to rotate, the adjusting mechanism pushes the bolt to abut against the thread rolling device, and the reset mechanism drives the thread rolling device to thread roll the outer wall of the rotating bolt, and the transmission mechanism automatically conveys the next bolt after the thread rolling is completed.

[0014] As a preferred embodiment of the above technical solution, the adjusting mechanism comprises:

[0015] A pushing assembly composed of a telescopic rod and a pressing plate installed on the inner wall of the thread rolling machine body;

[0016] A lead screw and a threaded sleeve, wherein the lead screw is driven by a drive motor and the threaded sleeve is threadedly connected to the lead screw;

[0017] The third slider and the third slide rail are located at the bottom of the threaded sleeve block to ensure translational stability.

[0018] The first limiting groove and the elastic element are located at the bottom of the extrusion plate;

[0019] The elastic element is connected to the connecting frame and the ball bearing at its bottom end, and the ball bearing makes rolling contact with the inner wall of the thread rolling machine body.

[0020] The second slider and the second slide rail are symmetrically arranged on both sides of the connecting frame.

[0021] As a preferred embodiment of the above technical solution, the reset mechanism includes:

[0022] The first cavity is formed in the side wall of the wire rolling machine body;

[0023] Hydraulic rods are symmetrically installed on both sides of the base plate, and their ends are connected to the connecting plate in the first cavity;

[0024] The slide rod and the electric slide table are provided. One end of the slide rod is fixed to the connecting plate, and the other end extends into the first cavity. The electric slide table is slidably sleeved on the slide rod and is externally mounted on a frame.

[0025] As a preferred embodiment of the above technical solution, the disassembly and assembly mechanism includes:

[0026] Mounting plate and plug slot are located on the inner wall of the mounting frame;

[0027] The plug-in plate and the limiting plate are fixed to the side wall of the thread rolling device, and the plug-in plate can be inserted into the plug-in slot;

[0028] The first slider and the first slide rail are both trapezoidal structures. The first slider is installed on the inner wall of the mounting frame, and the first slide rail is opened on the outer wall of the mounting plate.

[0029] As a preferred embodiment of the above technical solution, the transmission mechanism includes:

[0030] A second cavity is formed in the side wall of the extrusion plate;

[0031] Multiple sets of rotating rods and rotating cylinders are installed at equal intervals in the second cavity;

[0032] The conveyor belt is fitted onto the outer wall of the rotating drum; the mounting bracket is fixed at equal intervals to the outer wall of the conveyor belt to support the bolts.

[0033] Multiple sets of rotating rod signals are connected to the same controller, driving the conveyor belt to move in a stepping manner.

[0034] On the other hand, this application also provides a method for bolt thread rolling, the specific steps of which are as follows:

[0035] S1. Place the bolt to be processed on the mounting frame;

[0036] S. Start the motor of the transmission mechanism to drive the rotating rod, the rotating drum and the conveying belt, and send the first bolt to the preset thread rolling station (located in front of the thread rolling device) and make the bolt start to rotate (which can be realized by friction or clamping structure);

[0037] S3. Start the adjusting mechanism: control the extension of the telescopic rod and / or drive the motor to rotate, the telescopic rod pushes the extrusion plate or the drive motor moves the extrusion plate to the direction of the thread rolling device through the screw rod, threaded sleeve block, the extrusion plate pushes the bolt in the thread rolling station to abut against the working surface of the thread rolling device. In this process, the elastic member and the ball provide buffering and friction reduction;

[0038] S4. Start the reset mechanism: control the electric sliding table to slide along the slide rod to the bolt direction, or the hydraulic rod is retracted (or actively extended) under the extrusion of the bolt and the thread rolling device, push the thread rolling device to tightly press against the rotating bolt, complete the thread rolling;

[0039] S5. After processing is completed: control the electric sliding table to slide along the slide rod to the direction away from the bolt to reset, and / or the hydraulic rod is extended to reset, drive the thread rolling device to retreat; the telescopic rod of the adjusting mechanism is retracted and / or the drive motor is reversed to drive the extrusion plate to retreat;

[0040] S6. The sensor (such as a position sensor, a pressure sensor or a photoelectric sensor) detects the processing completion signal, controls the motor of the transmission mechanism to start, drives the conveying belt to step move a station distance, sends the bolt on the next mounting frame to the thread rolling station, and repeats steps S3-S5;

[0041] S7. When the thread rolling device needs to be replaced, loosen the bolts fixing the limiting plate and the mounting plate, pull out the thread rolling device together with the limiting plate and the plug-in plate from the plug-in slot of the mounting plate along the first slide rail direction; insert the plug-in plate of the new thread rolling device into the plug-in slot, push it into place along the first slide rail, and then fix the limiting plate and the mounting plate with bolts.

[0042] The beneficial effects of the present application are:

[0043] (1) Quick mold replacement: the plug-in plate and the plug-in slot are matched and combined with the guide and limiting of the trapezoidal slide block, and are fastened by bolts, so that the disassembly and assembly of the thread rolling device are convenient and rapid;

[0044] (2) High-precision positioning and stable processing: the screw thread sleeve block cooperates with the third sliding block / slide rail to provide precise translation drive; the combination of elastic members and balls effectively absorbs vibration and reduces friction, cooperates with the second sliding block / slide rail, greatly improves the stability and positioning accuracy of the extrusion plate movement (which can be controlled within ±0.05mm); the combination of hydraulic rods and slide rods / electric sliding tables provides stable pressure and linear motion trajectory for the wire drawing process; the trapezoidal sliding block produces self-locking effect under processing pressure, preventing displacement of the wire drawing device;

[0045] (3) Automatic continuous production: the conveying belt cooperates with the equidistant mounting rack to realize automatic conveying and positioning of the bolts; the combination of sensors and control systems realizes automatic detection of completed processing and automatic feeding of the next workpiece, significantly improving production efficiency;

[0046] (4) Multi-specification adaptation: the stroke design of the adjusting mechanism (especially the screw drive part) combined with replaceable mounting racks enables the device to adapt to wire drawing processing of various specifications of M4-M24 bolts. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The embodiment of the application shown provides a front view of the internal structure in the state;

[0048] Figure 2 The embodiment of the application shown provides a Figure 1 The embodiment of the application shown provides a side view of the internal structure of the extrusion plate and the conveying belt in the state;

[0049] Figure 3 The embodiment of the application shown provides a Figure 1 The embodiment of the application shown provides a side view of the internal structure of the extrusion plate and the conveying belt in the state;

[0050] Figure 4 The embodiment of the application shown provides a Figure 1 The embodiment of the application shown provides a

[0051] Figure 5 The embodiment of the application shown provides a Figure 1 The embodiment of the application shown provides a

[0052] LEGEND:

[0053] 1, the body of the thread rolling machine; 2, telescopic rod; 3, extrusion plate; 4, first cavity; 5, sliding rod; 6, electric sliding table; 7, mounting frame; 8, mounting plate; 9, plug-in slot; 10, plug-in plate; 11, limiting plate; 12, thread rolling device; 13, first sliding block; 14, first sliding rail; 15, bottom plate; 16, hydraulic rod; 17, connecting plate; 18, first limiting groove; 19, elastic member; 20, connecting frame; 21, ball; 22, second sliding block; 23, second sliding rail; 24, second limiting groove; 25, screw rod; 26, threaded sleeve block; 27, third sliding block; 28, third sliding rail; 29, driving motor; 30, second cavity; 31, rotating rod; 32, rotating drum; 33, conveying belt; 34, mounting rack; 35, bolt. DETAILED DESCRIPTION

[0054] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be described clearly and completely below with reference to the embodiments.

[0055] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , in the embodiments of the present application: the bolt thread rolling processing device comprises a thread rolling machine body 1.

[0056] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the adjusting mechanism: is mainly used for accurately moving the bolt to be processed 35; the telescopic rod 2 is fixed to the inner wall of the thread rolling machine body 1, and its movable end is connected to the extrusion plate 3; the driving motor 29 is fixed to the thread rolling machine body 1, and its output shaft is connected to the screw rod 25; the screw rod 25 is located in the second limiting groove 24 formed in the thread rolling machine body 1; the threaded sleeve block 26 is threadedly connected to the screw rod 25, and its bottom is fixed with the third sliding block 27, which is in sliding cooperation with the third sliding rail 28 formed in the second limiting groove 24; the upper end of the threaded sleeve block 26 is connected to the extrusion plate 3; the bottom end of the extrusion plate 3 is provided with the first limiting groove 18, and the first limiting groove 18 is provided with the elastic member 19; the bottom end of the elastic member 19 is connected to the connecting frame 20, and the bottom of the connecting frame 20 is embedded with a plurality of rolling balls 21, which are in rolling contact with the inner bottom wall of the thread rolling machine body 1; the second sliding blocks 22 are symmetrically fixed to the outer walls of the connecting frame 20, and the second sliding rails 23 are formed in the inner wall of the thread rolling machine body 1 and in sliding cooperation with the second sliding blocks 22.

[0057] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the reset mechanism and disassembly mechanism: for installing the thread rolling device 12 and enabling it to reciprocate; the first cavity 4 is opened in the side wall of the thread rolling machine body 1. The connecting plate 17 is arranged in the first cavity 4; one end of the slide rod 5 is fixed to the connecting plate 17, and the other end extends into the deep part of the first cavity 4; the electric sliding table 6 is slidingly sleeved on the slide rod 5; the mounting frame 7 is fixed to the outer wall of the electric sliding table 6; the bottom plate 15 is fixed to the end of the electric sliding table 6; the hydraulic rod 16 is symmetrically installed on both sides of the bottom plate 15, and the other end of the hydraulic rod 16 is connected to the connecting plate 17; the disassembly mechanism is used to install the thread rolling device 12 on the mounting frame 7: the mounting plate 8 is fixed to the inner wall of the mounting frame 7; the plug-in groove 9 is opened in the root of the outer wall of the mounting plate 8; the limiting plate 11 is fixed to the side wall of the thread rolling device 12, and the plug-in plate 10 fixed thereon can be inserted into the plug-in groove 9; the first sliding block 13 is also fixed to the inner wall of the mounting frame 7, and the first sliding rail 14 is opened in the outer wall of the mounting plate 8 and slidingly matched with the first sliding block 13, and the mating surfaces of the first sliding block 13 and the first sliding rail 14 are all inclined trapezoidal structures; the limiting plate 11 can be fixed with the mounting plate 8 through bolts and other fasteners.

[0058] Working position relationship: the thread rolling device 12 is installed on the mounting frame 7 through the disassembly mechanism and is located on the side of the moving path of the mounting bracket 34 on the conveying belt 33; the extrusion plate 3 can move along the direction of the second sliding rail 23, and the moving direction is towards the thread rolling device 12.

[0059] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , the transmission mechanism: for conveying the bolts 35 to be processed; the second cavity 30 is opened in the side wall of the extrusion plate 3; a plurality of groups of rotating rods 31 are installed at equal intervals in the second cavity 30; a rotating drum 32 is sleeved on each rotating rod 31. The conveying belt 33 is sleeved on all the rotating drums 32; a plurality of mounting brackets 34 for placing the bolts 35 are fixed at equal intervals on the outer wall of the conveying belt 33; the plurality of groups of rotating rods 31 are driven by the motor not marked in the figure.

[0060] Screw thread rolling processing method (based on the above device)

[0061] S1. Place the bolts 35 to be processed on the mounting bracket 34;

[0062] S2. Start the motor of the transmission mechanism to drive the rotating rods 31 and the rotating drums 32 to rotate, drive the conveying belt 33 to move, send the first bolt 35 to the preset thread rolling station (located in front of the thread rolling device 12), and make the bolt 35 start to rotate (which can be realized through friction or clamping structure);

[0063] S3. Start the adjusting mechanism: control the extension of the telescopic rod 2 and / or drive the motor 29 to rotate. The telescopic rod 2 pushes the pressing plate 3 or drives the motor 29 to move the pressing plate 3 to the direction of the thread rolling device 12 through the screw rod 25 and the threaded sleeve block 26; the pressing plate 3 pushes the bolt 35 at the thread rolling station to abut against the working surface of the thread rolling device 12. In this process, the elastic member 19 and the ball 21 provide buffering and friction reduction;

[0064] S4. Start the reset mechanism: control the electric sliding table 6 to slide along the slide rod 5 to the direction of the bolt 35, or control the hydraulic rod 16 to retract (or actively extend) under the extrusion of the bolt 35 and the thread rolling device 12, push the thread rolling device 12 to tightly press against the self-rotating bolt 35, and complete the thread rolling;

[0065] S5. After the processing is completed: control the electric sliding table 6 to slide along the slide rod 5 to the direction away from the bolt 35 to reset, and / or control the hydraulic rod 16 to extend to reset, drive the thread rolling device 12 to retreat. The telescopic rod 2 of the adjusting mechanism is retracted and / or the motor 29 is reversed to drive the pressing plate 3 to retreat;

[0066] S6. The sensor (such as a position sensor, a pressure sensor or a photoelectric sensor) detects the processing completion signal, controls the motor of the transmission mechanism to start, drives the transmission belt 33 to step move a distance of a work station, sends the bolt 35 on the next mounting bracket 34 to the thread rolling station, and repeats steps S3-S5;

[0067] S7. When the thread rolling device 12 needs to be replaced, loosen the bolts fixing the limiting plate 11 and the mounting plate 8, pull out the thread rolling device 12 together with the limiting plate 11 and the plug-in plate 10 from the plug-in slot 9 of the mounting plate 8 along the direction of the first slide rail 14; insert the plug-in plate 10 of the new thread rolling device 12 into the plug-in slot 9, push it into place along the first slide rail 14, and then fix the limiting plate 11 and the mounting plate 8 with bolts.

[0068] Working principle

[0069] The operation of the device completely depends on the linkage of mechanical structure, and the specific process is as follows:

[0070] Workpiece conveying stage: the rotating rod 31 drives the rotating drum 32 to rotate under the drive of the motor, so that the transmission belt 33 in sleeve connection moves in a certain direction; when the mounting bracket 34 carrying the bolt 35 reaches the thread rolling station, the clamping groove structure of the mounting bracket 34 forces the bolt 35 to rotate with the rotating drum 32;

[0071] Workpiece positioning and feeding stage: the driving motor 29 is started, the screw rod 25 pushes the threaded sleeve block 26 to move linearly along the third slide rail 28, drives the extrusion plate 3 to translate to the direction of the thread rolling device 12; the extrusion plate 3 continues to advance after contacting the bolt 35: the elastic member 19 is compressed and shrunk to absorb the initial impact; the ball 21 rolls on the inner wall of the thread rolling machine body 1 to offset the lateral biasing force; the second sliding block 22 slides along the second slide rail 23 to maintain the horizontal movement of the extrusion plate 3;

[0072] Thread forming stage: the bolt 35 is pushed to the working surface of the thread rolling device 12, and the relative friction between the self-rotation movement of the bolt 35 and the static die of the thread rolling device 12 is generated; the hydraulic rod 16 is contracted under the reaction force, pushes the connecting plate 17 to make the slide rod 5 slide into the first cavity 4, the electric slide 6 moves axially along the slide rod 5 to ensure that the thread rolling device 12 is pressed against the bolt 35 with constant pressure; the trapezoidal first sliding block 13 is engaged with the inclined surface of the first slide rail 14 to form mechanical self-locking under pressure, preventing the thread rolling device 12 from vibrating and deviating;

[0073] Reset and cycle stage: the limit switch is triggered when the hydraulic rod 16 is compressed to the limit position, the electric slide 6 moves reversely to drive the thread rolling device 12 to retreat; the screw rod 25 reverses, the threaded sleeve block 26 pulls back the extrusion plate 3; the photoelectric sensor detects the empty signal of the mounting frame 34, and the belt 33 steps to move to the next station, and the cycle restarts.

[0074] The above examples are only used to illustrate the technical solutions of the present application, and not to limit it.

Claims

1. A bolt thread rolling processing device, characterized in that, include: Thread rolling machine body (1); An adjustment mechanism is installed inside the thread rolling machine body (1) and is used to adjust the position of the workpiece; The wire rolling device (12) is detachably installed inside the wire rolling machine body (1) via a disassembly and assembly mechanism; A reset mechanism is connected to the wire rolling device (12) and drives it to reciprocate. A transmission mechanism, mounted on the adjustment mechanism, is used to transport the bolts to be processed (35); The transmission mechanism drives the bolt (35) to rotate, the adjustment mechanism pushes the bolt (35) to abut against the thread rolling device (12), the reset mechanism drives the thread rolling device (12) to roll the threads on the outer wall of the rotating bolt (35), and after the thread rolling is completed, the transmission mechanism automatically delivers the next bolt.

2. The bolt thread rolling device according to claim 1, characterized in that, The adjustment mechanism includes: The pushing assembly, consisting of the telescopic rod (2) and the extrusion plate (3), is installed on the inner wall of the wire rolling machine body (1); A lead screw (25) and a threaded sleeve (26), wherein the lead screw (25) is driven by a drive motor (29), and the threaded sleeve (26) is threadedly connected to the lead screw (25); The third slider (27) and the third slide rail (28) are located at the bottom of the threaded sleeve block (26) to ensure translational stability; The first limiting groove (18) and the elastic element (19) are located at the bottom of the extrusion plate (3); The connecting frame (20) and the ball (21) are connected at the bottom of the elastic element (19), and the ball (21) rolls in contact with the inner wall of the wire rolling machine body (1). The second slider (22) and the second slide rail (23) are symmetrically arranged on both sides of the connecting frame (20).

3. The bolt thread rolling device according to claim 1, characterized in that, The reset mechanism includes: The first cavity (4) is opened in the side wall of the wire rolling machine body (1); Hydraulic rods (16) are symmetrically installed on both sides of the base plate (15), and their ends are connected to the connecting plate (17) in the first cavity (4); The slide rod (5) and the electric slide table (6) are provided. One end of the slide rod (5) is fixed to the connecting plate (17), and the other end extends into the first cavity (4). The electric slide table (6) is slidably sleeved on the slide rod (5) and is externally mounted on the frame (7).

4. The bolt thread rolling device according to claim 1, characterized in that, The disassembly / assembly mechanism includes: Mounting plate (8) and plug slot (9) are provided on the inner wall of mounting frame (7); The plug plate (10) and the limiting plate (11) are fixed to the side wall of the thread rolling device (12), and the plug plate (10) can be inserted into the plug slot (9); The first slider (13) and the first slide rail (14) are both trapezoidal structures. The first slider (13) is installed on the inner wall of the mounting frame (7), and the first slide rail (14) is opened on the outer wall of the mounting plate (8).

5. The bolt thread rolling device according to claim 1, characterized in that, The transmission mechanism includes: A second cavity (30) is formed in the side wall of the extrusion plate (3); Multiple sets of rotating rods (31) and rotating cylinders (32) are installed at equal intervals in the second cavity (30); A conveyor belt (33) is fitted onto the outer wall of the drum (32); a mounting bracket (34) is fixed at equal intervals to the outer wall of the conveyor belt (33) to support bolts (35); Among them, multiple sets of rotating rods (31) are connected to the same controller to drive the conveyor belt (33) to move in a step-by-step manner.

6. A bolt thread rolling method based on the device according to any one of claims 1-5, characterized in that, include: S1. Place the bolt (35) to be processed on the mounting bracket (34); S2. Start the motor of the transmission mechanism to drive the rotating rod (31) and the rotating drum (32) to rotate, drive the conveyor belt (33) to move, send the first bolt (35) to the preset thread rolling position (located in front of the thread rolling device (12)), and make the bolt (35) start to rotate (which can be achieved by friction or clamping structure); S3. Start the adjustment mechanism: Control the extension rod (2) to extend and / or drive the motor (29) to rotate. The extension rod (2) pushes the extrusion plate (3) or the drive motor (29) drives the extrusion plate (3) to move towards the thread rolling device (12) through the lead screw (25) and threaded sleeve (26). The extrusion plate (3) pushes the bolt (35) located at the thread rolling station to abut against the working surface of the thread rolling device (12). During this process, the elastic element (19) and the ball (21) provide cushioning and friction reduction. S4. Start the reset mechanism: Control the electric slide (6) to slide along the slide bar (5) towards the bolt (35), or the hydraulic rod (16) to retract (or actively extend) under the pressure of the bolt (35) and the thread rolling device (12), pushing the thread rolling device (12) to press tightly against the rotating bolt (35) to complete the thread rolling; S5. After processing: control the electric slide table (6) to slide and reset along the slide bar (5) away from the bolt (35), and / or the hydraulic rod (16) to extend and reset, driving the thread rolling device (12) to retract; adjust the telescopic rod (2) of the adjustment mechanism to retract and / or drive the motor (29) to reverse, driving the extrusion plate (3) to retract; S6. When the sensor (such as a position sensor, pressure sensor or photoelectric sensor) detects the processing completion signal, it controls the motor of the transmission mechanism to start, drives the conveyor belt (33) to move one station distance in steps, and sends the bolt (35) on the next mounting bracket (34) to the thread rolling station, repeating steps S3-S5. S7. When it is necessary to replace the thread rolling device (12), loosen the bolts of the fixed limiting plate (11) and the mounting plate (8), and pull the thread rolling device (12) together with the limiting plate (11) and the plug plate (10) out of the plug groove (9) of the mounting plate (8) along the direction of the first slide rail (14); insert the plug plate (10) of the new thread rolling device (12) into the plug groove (9), and push it into place along the first slide rail (14), and then fix the limiting plate (11) and the mounting plate (8) with bolts.

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