CN111702087A

CN111702087A - Tabletting double-twist-lock type flat-bottom rivet-free plastic connecting device and method

Info

Publication number: CN111702087A
Application number: CN202010536109.2A
Authority: CN
Inventors: 陈超; 张惠阳; 黄明辉; 彭浩
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-09-25
Anticipated expiration: 2040-06-12
Also published as: CN111702087B

Abstract

The invention provides a tabletting double-twist-lock type flat-bottom rivet-free plastic connecting device, which comprises: the riveting-free connecting mechanism comprises a base, a chassis, a main shaft transmission mechanism, a riveting-free connecting mechanism, connecting rod punching mechanisms and a controller, wherein the base is arranged along a plane, the chassis is vertically arranged above the base through a stand column, the chassis is provided with a front end channel, the main shaft transmission mechanism is arranged above the front end channel, the riveting-free connecting mechanism is arranged at the lower part of the main shaft transmission mechanism, the connecting rod punching mechanisms are arranged at two sides of the chassis, the connecting rod punching mechanisms are used for driving the riveting-free connecting mechanism to vertically move, the main shaft transmission mechanism is used for driving the riveting-free connecting mechanism to circumferentially rotate; the invention also provides a tabletting double-twist-lock type flat-bottom rivet-free plastic connection method. The device has reasonable structure and safe and quick connection mode, and can form a plate connection structure which has strong mechanical property, resists torque and has a flat surface on one side of a connection point.

Description

Tabletting double-twist-lock type flat-bottom rivet-free plastic connecting device and method

Technical Field

The invention relates to the technical field of plate connection, in particular to a tabletting double-twist lock type flat-bottom rivet-free plastic connection device and method.

Background

The 'high-performance precise forming manufacturing science' is an important direction for the development of the mechanical engineering subject. The light weight technology aiming at energy saving and emission reduction is considered as one of the key technologies for high-performance forming and manufacturing. The light alloy material is used for replacing or partially replacing the traditional steel material, and the light alloy material becomes a specific implementation mode of the future light weight technology in the transportation industry such as aerospace, automobiles, airplanes and the like. Welding and riveting are two main ways of connecting light alloy materials and are widely applied in the transportation industry.

However, the traditional welding (such as MIG welding and TIG welding) process is easy to generate toxic and harmful gases, and has certain harm to human bodies while polluting the environment. The common riveting needs to be perforated in advance, so that the processing time is long, and the process is complex. Self-piercing riveting does not require pre-punching, but instead requires the use of rivets to penetrate the upper sheet material, potentially damaging the sheet material, adding weight to the joint, and easily producing circumferential rotation by resisting torque through friction between the sheet materials and between the sheet material and the rivets. In addition, the self-piercing rivet creates a high protrusion on one side of the sheet, which limits its use to areas that require aesthetics and functional areas that slip.

Disclosure of Invention

The invention provides a tabletting double-twist-lock type flat-bottom rivet-free plastic connecting device and method, and aims to achieve the purposes that harmful gas is not generated during plate connection, the plate is not damaged, the torque is resisted, and a higher bulge is not generated.

In order to achieve the above objects, an embodiment of the present invention provides a sheeting dual twist lock flat bottom rivetless plastic joining apparatus comprising: the riveting device comprises a base, a case, a main shaft transmission mechanism, a connecting rod punching mechanism, a rivetless connection mechanism, a controller and a flat die;

the base sets up along the plane, the machine case is in through the vertical setting of a stand the base top, the front end passageway has been seted up to the machine case, main shaft drive sets up the front end passageway top of machine case, main shaft drive's lower part is passed the front end passageway, no rivet coupling mechanism sets up main shaft drive's lower part, connecting rod punching press mechanism symmetry sets up machine case both sides, connecting rod punching press mechanism with no rivet coupling mechanism connects, connecting rod punching press mechanism is used for driving no rivet coupling mechanism vertical motion, main shaft drive is used for driving no rivet coupling mechanism is along the rotation in circumference, the controller electricity is connected main shaft drive and connecting rod punching press mechanism.

The spindle transmission mechanism is provided with a spindle stepping motor, a coupler and a spindle, the spindle stepping motor is arranged above the front end channel, an upper spindle bearing and a lower spindle bearing are respectively arranged above and below the front end channel, the spindle penetrates through the upper spindle bearing and the lower spindle bearing and is rotatably arranged in the front end channel, the bottom of the spindle is located outside the front end channel, the rivet-free connecting mechanism is arranged at the bottom of the spindle, and the controller is electrically connected with the spindle stepping motor.

Wherein, no riveting coupling mechanism is provided with drift connector, drift and outer pressure limit circle, main shaft slip through-hole has been seted up at drift connector's center, drift connector passes through main shaft slip through-hole sets up with sliding the bottom of main shaft, main shaft slip through-hole inboard is provided with the rectangle arch, the main shaft bottom is provided with the rectangle recess, the main shaft passes through rectangle recess and the protruding cooperation of rectangle to drift connector transmission moment of torsion, the drift inlays to be established the bottom of drift connector, the embedded groove is seted up to main shaft slip through-hole's bottom, the drift inlays to be established in the embedded groove, the extending groove has been seted up at the top of drift, the radius of extending groove with the radius of main shaft slip through-hole is the same, outer pressure limit circle cover is established outside the drift.

The outer side of the bottom of the punch connector is provided with an external thread, the punch nut is screwed and fixed on the outer side of the bottom of the punch connector, and the punch nut is matched with the punch connector to fix the outer edge of the punch.

The bottom of the punch nut is uniformly provided with a plurality of fan-shaped bulges, the top of the outer pressing edge ring is provided with fan-shaped grooves with the same number, the outer pressing edge ring is movably sleeved on the outer side of the punch nut through the fan-shaped bulges and the fan-shaped grooves, the bottom of the punch nut is vertically provided with an edge pressing spring, and the bottom of the edge pressing spring is connected with the inner side of the bottom edge of the outer pressing edge ring.

The punching head structure comprises a punching head and is characterized in that a punching head groove is formed in the bottom of the punching head, a plurality of trapezoidal spiral protrusions are arranged on the outer side of the bottom of the punching head, a plurality of circular arc spiral depressions are formed in the inner wall of the punching head groove, an inner pressing edge ring is arranged in the punching head groove, and the inner pressing edge ring is connected with the bottom surface of the punching head groove through an inner pressing edge spring.

The punch is characterized in that a pressing sheet is placed in the connecting point in advance, a plurality of pressing sheet protrusions are arranged on the bottom surface of the punch, the pressing sheet is an annular pressing sheet, the shape of the pressing sheet is the same as that of the bottom surface of the punch, a plurality of pressing sheet grooves are formed in the top surface of the pressing sheet, and the pressing sheet grooves correspond to the pressing sheet protrusions one to one.

Wherein, connecting rod punching press mechanism is provided with two punching press step motor, two screw rods and two sliders, the punching press recess has been seted up respectively to quick-witted case both sides, both sides all the fixed screw bearing that is provided with in the punching press recess, punching press step motor's output shaft with screw rod fixed connection, the screw rod pivoted wears to establish in the screw bearing, the slider inboard is seted up threadedly, the slider spiro union is in on the screw rod, both sides the slider is provided with the connecting rod respectively, two the connecting rod is connected to respectively not riveting coupling mechanism's both sides, controller and both sides punching press step motor electricity is connected.

Wherein, the upper portion outside cover of drift connector is equipped with the bearing frame, be provided with drift swivel bearing between bearing frame and the drift connector, the both sides and two of bearing frame the bottom of slider all is provided with the connecting rod connecting portion that have the through-hole, the connecting rod pass through the fixed pin with the cooperation of connecting rod connecting portion sets up between bearing frame and the slider, every still wear to be equipped with the split pin on the fixed pin.

The embodiment of the invention also provides a tabletting double-twist-lock type flat-bottom rivet-free plastic connection method, which comprises the following steps:

the method comprises the following steps: placing a flat die on a base, placing two metal plates to be connected on the flat die, placing a pressing sheet at a joint, and simultaneously enabling a pressing sheet groove on the pressing sheet to be positioned under a pressing sheet bulge of a punch, and setting the descending distance and the rotating angle of the punch according to the type and the thickness of the metal plates to be connected;

step two: starting the equipment, wherein the stamping stepping motor drives the screw rod to rotate, the sliding parts on two sides of the case slide towards the inner side and drive the lower parts of the connecting rods on two sides to move downwards, so that the bearing seat is driven to descend, and the punch connector and the punch head also descend; when the punch head descends to a set distance, the tabletting bulge at the bottom of the punch head is completely superposed with the tabletting groove on the tabletting until the lower surface of the punch head is jointed with the upper surface of the tabletting;

step three: when the punch and the pressing sheet are completely attached, the spindle stepping motor rotates slightly and drives the spindle, the connector to rotate and the punch to rotate along with the spindle stepping motor through the coupler; along with the continuous descending of the punch driven by the bearing seat, the inner pressing edge spring and the pressing edge spring are stressed and compressed to generate pressing edge force, so that the inner pressing edge ring and the outer pressing edge ring press the plates tightly, under the influence of the punch and the flat die, two layers of plate materials below the punch can be stressed and extruded to flow along the radial direction, under the action of the inner pressing edge ring and the outer pressing edge ring, the material of the upper plate can move to the gap between the pressing edge ring and the punch, the material of the lower plate is gathered at the neck of the upper plate, and the two layers of plate materials are hooked together to form a first mechanical lock and a second mechanical lock; the pressing sheet extrudes the plate along with the downward pressing of the punch, and the pressing sheet begins to deform and starts to flow along the radial direction along with the increase of the punching force, so that the first mechanical lock and the second mechanical lock are further extruded and enlarged; the trapezoidal spiral bulge on the outer side of the punch head extrudes the upper plate, a trapezoidal spiral recess appears at the corresponding position of the upper plate, a trapezoidal spiral recess is also formed at the corresponding position of the lower plate, and then the arc spiral deformation structures of the upper plate and the lower plate form an external spiral lock; the upper plate material on the inner side of the punch is pressed to flow into the arc spiral recess, the outer part of the corresponding part of the upper plate is provided with the arc spiral protrusion, the inner part of the upper plate is provided with the arc spiral recess, meanwhile, the lower plate flows to the arc spiral recess of the upper plate, the corresponding part of the lower plate is also provided with the arc spiral protrusion, and then the arc spiral deformation structure of the upper plate and the lower plate forms an inner spiral lock;

step four: and when the punch head is withdrawn from the workpiece, the main shaft stepping motor stops working, the two punching stepping motors continue to rotate reversely until the punch head is reset, and the connection of the plates is finished.

The scheme of the invention has the following beneficial effects:

1. the connecting point of the invention is provided with an inner mechanical lock, an outer mechanical lock and two spiral locks, and has reliable connection, higher static strength and fatigue strength and better comprehensive mechanical property.

2. The annular pressing sheet enlarges the interlocking degree of the two mechanical locks, increases the structural rigidity of the connecting point and greatly increases the connecting reliability.

3. The invention does not need to punch in advance, has simple process, no potential material damage, lighter weight of connecting points, lower forming force and low connecting and forming cost.

4. The connecting point of the invention is formed with two spiral locks which effectively resist torque and do not rotate circumferentially.

5. The invention does not discharge toxic and harmful gas during connection, saves more energy and reduces emission, and has no influence on personal safety of operators.

6. The flat side of the connection point of the invention allows the panel to be used in functional areas where sliding is required, as well as areas where aesthetic appearance is required.

Drawings

FIG. 1 is a front elevation partial cross-sectional view of a first wafer double twist lock flat bottom rivetless plastic attachment apparatus of the present invention;

FIG. 2 is a second elevational view, partially in section, of the sheeting dual twist lock flat bottom rivetless plastic joining apparatus of the present invention;

FIG. 3 is a side view of the sheeting dual twist lock flat bottom rivetless plastic attachment apparatus of the present invention;

FIG. 4 is a cross-sectional view of the rivetless attachment mechanism of the sheeting dual twist lock flat bottom rivetless plastic attachment apparatus of the present invention;

FIG. 5 is a schematic view of a punch connector of the sheeting dual twist lock flat bottom rivetless plastic attachment apparatus of the present invention;

FIG. 6 is a schematic view of the rivetless connection mechanism of the tabletting dual twist-lock type flat bottom rivetless plastic connection device of the present invention;

FIG. 7 is a schematic view of the punch nut of the sheeter dual twist lock flat bottom rivetless plastic attachment of the present invention;

FIG. 8 is a schematic view of a punch cut-away of the sheeting dual twist-lock flat bottom rivetless plastic joining apparatus of the present invention;

FIG. 9 is a schematic view of the punch structure of the sheeter dual twist lock flat bottom rivetless plastic attachment of the present invention;

FIG. 10 is a schematic view of the motor connector structure of the sheeting dual twist lock flat bottom rivetless plastic attachment of the present invention;

FIG. 11 is a schematic view of the slider structure of the sheeter dual twist lock flat bottom rivetless plastic attachment of the present invention;

FIG. 12 is a simplified flow diagram of the sheeting dual twist lock flat bottom rivetless plastic joining method of the present invention;

FIG. 13 is a stamped initial cross-sectional view of a preform dual twist lock flat bottom rivetless plastic tie point of the present invention;

FIG. 14 is a stamped cross-sectional view of a preform dual twist lock flat bottom rivetless plastic tie point of the present invention;

FIG. 15 is a front view of a preform dual twist lock flat bottom rivetless plastic tie point of the present invention;

FIG. 16 is a longitudinal cross-sectional view of a preform dual twist lock flat bottom rivetless plastic tie point of the present invention;

FIG. 17 is a transverse cross-sectional view of a preform dual twist-lock flat bottom rivetless plastic tie point of the present invention;

FIG. 18 is a schematic view in section of a sheeted dual twist lock flat bottom rivetless plastic tie point of the present invention;

FIG. 19 is a top view of a preform dual twist lock flat bottom rivetless plastic tie point of the present invention;

figure 20 is a schematic view of a tablet configuration of the tablet dual twist lock flat bottom rivetless plastic attachment points of the present invention.

[ description of reference ]

1-a base; 1 a-a column; 2-a case; 3-a main shaft transmission mechanism; 4-connecting rod punching mechanism; 5-rivet-free connection mechanism; 6-a controller; 7-tabletting; 8-flat die; 9 a-upper plate; 9 b-lower plate; 9 c-first mechanical lock; 9 d-a second mechanical lock; 9 e-external screw lock; 9 f-inner screw lock; 301-spindle stepper motor; 302-a coupling; 303-a main shaft; 303 a-rectangular groove; 304-main shaft upper bearing; 305-main shaft lower bearing; 306-an upper bearing sleeve; 307-lower bearing housing; 308-external nut at shaft end; 309-inner nut at shaft end; 401-stamping a stepping motor; 402-a screw; 403-a slide; 404-a connecting rod; 405-a motor connector; 406-a bearing seat; 407-fixed pins; 408-a cotter pin; 409-deep groove ball bearing; 410-thrust ball bearing; 411-bearing end cap; 411 a-bearing end cap screw; 412-bearing nut; 501-a punch connector; 501 a-rectangular protrusion; 502-a punch; 502 a-extension slot; 502 b-trapezoidal spiral protrusions; 502 c-arc spiral recess; 502 d-tablet protrusions; 503-pressing the edge ring externally; 503 a-sector groove; 504-punch nut; 504 a-scalloped protrusions; 505-a binder spring; 506-inner pressing edge ring; 507-inner pressing edge spring; 701-tabletting grooves.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides a tabletting double-twist lock type flat-bottom rivet-free plastic connecting device and method, aiming at the problems that the traditional welding is easy to generate toxic gas, the self-punching connection is easy to damage plates, and the connecting points are not smooth enough.

As shown in fig. 1 to 3, an embodiment of the present invention provides a tabletting dual twist-lock flat bottom rivetless plastic joining apparatus comprising: the riveting machine comprises a base 1, a case 2, a main shaft transmission mechanism 3, a connecting rod punching mechanism 4, a rivetless connecting mechanism 5, a controller 6 and a flat die 8; the base 1 sets up along the plane, quick-witted case 2 is in through the vertical setting of a stand 1a base 1 top, the front end passageway has been seted up to quick-witted case 2, spindle drive mechanism 3 sets up the front end passageway top of quick-witted case 2, spindle drive mechanism 3's lower part is passed the front end passageway, no rivet coupling mechanism 5 sets up spindle drive mechanism 3's lower part, connecting rod punching mechanism 4 symmetry sets up quick-witted case 2 both sides, connecting rod punching mechanism 4 with no rivet coupling mechanism 5 is connected, connecting rod punching mechanism 4 is used for driving no rivet coupling mechanism 5 vertical motion, spindle drive mechanism 3 is used for driving no rivet coupling mechanism 5 is along the rotation in circumference, 6 electricity of controller is connected spindle drive mechanism 3 and connecting rod punching mechanism 4.

According to the pressing sheet double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the base 1 is fixedly arranged on the ground, the case 2 is vertically arranged above the base 1 through the upright post 1a, the flat die 8 is arranged on the base 1, when plates need to be connected, the pressing sheet 7 needs to be placed at a connecting point in advance, the connecting rod punching mechanism 4 can drive the rivet-free connecting mechanism 5 to descend to a set height, when the pressing sheet 7 is contacted and the plates are pressed down, the main shaft transmission mechanism 3 can drive the rivet-free connecting mechanism 5 to rotate, and the rivet-free connecting mechanism 5 can rotate together when the plates are punched, so that the plates are connected.

As shown in fig. 2, the spindle transmission mechanism 3 is provided with a spindle stepping motor 301, a coupler 302 and a spindle 303, the spindle stepping motor 301 is disposed above the front end channel, an upper spindle bearing 304 and a lower spindle bearing 305 are respectively disposed above and below the inside of the front end channel, the spindle 303 is rotatably disposed in the front end channel through the upper spindle bearing 304 and the lower spindle bearing 305, the bottom of the spindle 303 is located outside the front end channel, the rivetless connection mechanism 5 is disposed at the bottom of the spindle 303, and the controller 7 is electrically connected to the spindle stepping motor 301.

According to the tabletting double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, two cylindrical holes are formed in the front end channel, the main shaft upper bearing 304 and the main shaft lower bearing 305 are respectively installed in the two cylindrical holes, meanwhile, the main shaft upper bearing 304 and the main shaft lower bearing 305 are respectively sleeved with the upper bearing sleeve 306 and the lower bearing sleeve 307 for further positioning, the bottom of the front end channel is provided with the shaft end outer nut 308 and the shaft end inner nut 309, the shaft end outer nut 308 abuts against the outer ring of the main shaft lower bearing 305 and is screwed with the thread at the lowest end of the front end channel, and the shaft end inner nut 309 abuts against the inner ring of the main shaft lower bearing 305 and is screwed with the thread on the main shaft; when the spindle stepping motor 301 rotates, the spindle 303 can transmit the rotation of the spindle stepping motor 301 through the coupler 302, and at the same time, the spindle 303 can freely rotate in the front end channel by the spindle upper bearing 304 and the spindle lower bearing 305.

As shown in fig. 2, 4 and 5, the rivet-less connecting mechanism 5 is provided with a punch connector 501, a punch 502 and an outer pressing edge ring 503, a main shaft sliding through hole is formed in the center of the punch connector 501, the punch connector 501 is slidably disposed at the bottom of the main shaft 303 through the main shaft sliding through hole, a rectangular protrusion 501a is disposed inside the main shaft sliding through hole, a rectangular groove 303a is disposed at the bottom of the main shaft 303, the main shaft 303a transmits torque to the punch connector 501 through the cooperation of the rectangular groove 303a and the rectangular protrusion 501a, the punch 502 is embedded at the bottom of the punch connector 501, an embedded groove is formed at the bottom of the main shaft sliding through hole, the punch 502 is embedded in the embedded groove, an extending groove 502a is formed at the top of the punch 502, and the radius of the extending groove 502a is the same as the radius of the main shaft sliding through hole, the outer pressing edge ring 503 is sleeved outside the punch 502.

According to the tabletting double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the embedded groove is formed in the bottom end of the punch connector 501, the embedded groove is rectangular, the top shaft end of the punch 502 is rectangular, the punch and the punch are installed in a matched manner to realize torque transmission, meanwhile, the rectangular protrusion 501a arranged on the inner wall of the main shaft sliding through hole of the punch connector 501 can be matched with the rectangular groove 303a at the bottom of the main shaft 303 to transmit torque, so that when the main shaft 303 rotates, the punch connector 501 can drive the punch 502 to rotate together, and when the punch 502 descends to a preset distance, the outer pressing edge ring 503 can be pressed onto a plate to be connected under stress.

As shown in fig. 4, 5 and 7, the outer side of the bottom of the punch connector 501 is provided with an external thread, a punch nut 504 is screwed and fixed on the outer side of the bottom of the punch connector 501, and the punch nut 504 is matched with the punch connector 501 to fix the outer edge of the punch 502.

According to the tabletting dual-twist lock type flat-bottom rivet-free plastic connecting device in the above embodiment of the invention, the punch nut 504 is provided with a through hole in the middle, the bottom of the punch 502 can pass through the through hole of the punch nut 504, and meanwhile, the radius of the outer edge of the middle part of the punch 502 is larger than that of the through hole of the punch nut 504, so that when the punch nut 504 and the punch connector 501 are screwed together, the punch 502 is clamped and fixed between the punch nut 504 and the punch connector 501.

As shown in fig. 6 and 7, a plurality of fan-shaped protrusions 504a are uniformly arranged at the bottom of the punch nut 504, the top of the outer pressing ring 503 is provided with a plurality of fan-shaped grooves 503a, the outer pressing ring 503 is movably sleeved on the outer side of the punch nut 504 through the fan-shaped protrusions 504a and the fan-shaped grooves 503a, a pressing spring 505 is vertically arranged at the bottom of the punch nut 504, and the bottom of the pressing spring 505 is connected to the inner side of the bottom edge of the outer pressing ring 503.

According to the tabletting double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the fan-shaped protrusion 504a is arranged on the outer side of the bottom of the punch nut 504, the fan-shaped groove 503a is formed in the top of the external pressing edge ring 503, and the external pressing edge ring 503 can be sleeved above the punch nut 504 through the fan-shaped groove 503 a; the edge pressing spring 505 is connected between the punch nut 504 and the outer edge pressing ring 503, so that when the outer edge pressing ring 503 is pressed against the plates to be connected, the edge pressing spring 505 can generate edge pressing force.

As shown in fig. 8 and 9, a punch groove is formed at the bottom of the punch 502, a plurality of trapezoidal spiral protrusions 502b are arranged on the outer side of the bottom of the punch 502, a plurality of circular arc spiral depressions 502c are arranged on the inner wall of the punch groove, an inner pressing edge ring 506 is arranged in the punch groove, and the inner pressing edge ring 506 is connected with the bottom surface of the punch groove through an inner pressing edge spring 507.

According to the tabletting double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the inner pressing edge ring 506 can vertically displace in the punch groove, when the punch 502 punches a plate to be connected, the inner pressing edge ring 506 can play a role of pressing the center of a connecting point, and the inner pressing edge spring 507 can provide a pressing force for the inner pressing edge ring 506; in this embodiment, eight trapezoidal spiral protrusions 502b are arranged on the outer side of the punch 502, corresponding trapezoidal spiral depressions are formed at the connection points of the plates by the trapezoidal spiral protrusions 502b, four circular arc spiral depressions 502c are arranged on the inner wall of the punch groove, and the corresponding circular arc spiral protrusions are formed on the plates by the circular arc spiral depressions 502 c.

As shown in fig. 9 and 20, a pressing sheet 7 is placed in advance at a connection point, a plurality of pressing sheet protrusions 502d are arranged on the bottom surface of the punch 502, the pressing sheet 7 is an annular pressing sheet, the shape of the pressing sheet 7 is the same as that of the bottom surface of the punch 502, a plurality of pressing sheet grooves 701 are formed in the top surface of the pressing sheet 7, and the pressing sheet grooves 701 correspond to the pressing sheet protrusions 502d one to one.

According to the pressing sheet double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the pressing sheet 7 is placed in advance at the connecting point, the pressing sheet groove 701 on the top surface of the pressing sheet 7 can be matched with the pressing sheet protrusion 502d on the bottom surface of the punch 502, and when the pressing sheet groove 701 is attached to the pressing sheet protrusion 502d, the pressing sheet 7 and the punch 502 can transmit torque.

As shown in fig. 2, 10 and 11, the connecting rod punching mechanism 4 is provided with two punching stepping motors 401, two screws 402 and two sliders 403, the punching grooves 201 are respectively formed in two sides of the chassis 2, the screw bearings 202 are fixedly arranged in the punching grooves 201 on two sides, the output shaft of the punching stepping motor 401 is fixedly connected with the screws 402, the screws 402 are rotatably arranged in the screw bearings 202 in a penetrating manner, the inner sides of the sliders 403 are provided with threads, the sliders 403 are connected with the screws 402 through the threads, the sliders 403 on two sides are respectively provided with connecting rods 404, the two connecting rods 404 are respectively connected to two sides of the rivet-free connecting mechanism 5, and the controller 6 is electrically connected with the punching stepping motors 401 on two sides.

According to the tabletting dual-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the motor connector 405 is sleeved outside the screw 402, the sliding piece groove is formed in the motor connector 405, and the sliding piece 403 can slide along the screw 402 along the sliding piece groove.

As shown in fig. 2 and 4, a bearing seat 406 is sleeved on the outer side of the upper portion of the punch connector 501, a punch rotating bearing is arranged between the bearing seat 406 and the punch connector 501, connecting rod connecting portions with through holes are arranged on both sides of the bearing seat 406 and the bottoms of the two sliding members 403, the connecting rod 404 is arranged between the bearing seat 406 and the sliding members 403 by matching with the connecting rod connecting portions through fixing pins 407, and a cotter pin 408 is further arranged on each fixing pin 407 in a penetrating manner.

According to the tabletting double-twist lock type flat-bottom rivet-free plastic connecting device provided by the embodiment of the invention, the punch rotating bearings arranged between the punch connector 501 and the bearing seat 406 from top to bottom are the deep groove ball bearing 409 and the thrust ball bearing 410, the bearing end cover 411 is arranged above the bearing seat 406, the bearing end cover 411 is fixed through a bearing end cover screw 411a, and meanwhile, the bearing nut 412 is arranged, and the bearing nut 412 is screwed with the top end thread of the punch connector 501 to position the deep groove ball bearing 409; the bearing block 406 is connected to the sliding member 403 through the connecting rod 404 on both sides, so that the connecting rod 404 pushes the bearing block 406 together with the punch connector 501 downward to complete the punching process when the sliding member 403 moves inward.

As shown in fig. 12, an embodiment of the present invention provides a method of sheeting dual twist lock flat bottom rivetless plastic joining comprising:

the method comprises the following steps: before the plates are connected, a flat die 8 is placed on a base 1, two metal plates to be connected are placed on the flat die 8, a pressing sheet 7 is placed at a position to be connected, a pressing sheet groove 701 on the pressing sheet 7 is positioned under a pressing sheet protrusion 502d of a punch 502, and the descending distance and the rotating angle of the punch 502 are set according to the material type and the thickness of the metal plates to be connected;

step two: starting equipment, wherein stamping stepping motors 401 positioned at the left side and the right side of a case 2 start to act, shafts of the stamping stepping motors start to rotate to drive screws 402 at the two sides to rotate, threads of the screws 402 drive sliding pieces 403 at the two sides to move towards the case 2, the lower parts of two connecting rods 404 slide downwards along with the sliding pieces 403 to drive a bearing seat 406 to descend, a punch connector 501 arranged in the bearing seat 406 descends, and accordingly a punch 502 is driven to descend until the lower surface of the punch 502 completely coincides with the upper surface of a pressing sheet 7 when a pressing sheet protrusion 502d of the punch 502 completely coincides with a pressing sheet groove 701 of the pressing sheet 7;

step three: when the punch 502 is completely attached to the pressing sheet 7 and the sheet material, the shaft of the spindle stepping motor 301 starts to rotate slightly, the spindle 303 is driven to rotate through the coupler 302, the spindle 303 drives the punch connector 501 to rotate, so that the punch 502 rotates slightly along with the punch, and the sheet material enters a sheet material deformation stage; along with the descending of the punch 502, the inner edge pressing spring 507 generates edge pressing force to enable the inner edge pressing ring 506 to press the plate, and the edge pressing spring 505 generates edge pressing force to enable the outer edge pressing ring 503 to press the plate; the plate is limited in up-and-down movement under the influence of the punch 502 and the flat die 8, two plate materials below the punch 502 are extruded and flow to the area which is not extruded by the punch 502 along the radial direction, the flow of the two plate materials below the outer side edge pressing ring is blocked due to the edge pressing force of the inner edge pressing ring 506 and the outer edge pressing ring 503, the two plate materials start to move upwards, the periphery and the middle concave part of the punch 502 move, the material of the upper plate 9a is converged to the gap between the inner edge pressing ring and the punch 502, the material of the lower plate 9b is gradually converged to the neck part of the upper plate 9a, the two plates are gradually hooked and connected together, and a first mechanical lock 9c and a second mechanical lock 9 d; with the punch 502 being pressed down, the material deformation resistance of the pressing sheet 7 is just greater than the material deformation resistance of the two plates, the pressing sheet 7 is hardly deformed under pressure, with the two plates being pressed, the internal tissues of the two plates become dense, the deformation resistance of the material becomes greater, after the deformation resistance of the two plates is greater than the deformation resistance of the pressing sheet 7, the pressing sheet 7 is gradually deformed and starts to flow to the non-pressed area along the radial direction, and the deformed part of the pressing sheet 7 presses the lower side wall of the joint of the upper plate 9a, so as to further increase the inner and outer mechanical locks; meanwhile, as the outer side of the punch 502 is provided with a plurality of trapezoidal spiral protrusions 502b, the trapezoidal spiral protrusions 502b extrude the upper plate 9a, a plurality of trapezoidal spiral depressions are formed in the corresponding positions of the upper plate 9a, the other sides of the trapezoidal spiral depressions extrude the lower plate 9b, trapezoidal spiral depressions are also formed in the corresponding positions of the lower plate 9b, and the trapezoidal spiral deformation structures between the two plates gradually form the outer spiral lock 9 e; in addition, as the inner side of the punch 502 is provided with the arc spiral recess 502c, the material of the upper plate 9a flows into the arc spiral recess 502c under pressure, the outer part of the corresponding part of the upper plate 9a forms the arc spiral protrusion, meanwhile, the back surface of the arc spiral protrusion of the upper plate 9a forms the recess, meanwhile, the lower plate 9b flows to the recess of the upper plate 9a, the corresponding part of the lower plate 9b also forms the arc spiral protrusion, and further, the arc spiral deformation structure of the upper and lower plates 9b forms the inner spiral lock 9 f; because the punch 502 rotates slightly, deformation at the inner and outer screw locks is correspondingly promoted, and the screw locks have strong connecting action and can prevent the circumferential rotation of the connecting point; the connection point results are shown in fig. 13 to 19.

Step four: after the punch 502 descends to a preset distance and punching is completed, the punch stays for 3 seconds (preventing the plate from rebounding), then the shaft of the spindle stepping motor 301 is slightly reversed, the shafts of the two punching stepping motors 401 rotate reversely, the punch 502 rotates reversely slightly and is lifted, when the punch 502 is removed from the workpiece, the spindle stepping motor 301 stops working, and the shafts of the two punching stepping motors 401 continue to rotate reversely until the punch 502 returns to the initial position; finally, a completely flat sheet structure with a double twist lock of the pressure plate 7 on the side of the connecting point is obtained on the flat die 8.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a flat no rivet plastic connecting device of dual twistlock formula of preforming, its characterized in that includes: the riveting device comprises a base, a case, a main shaft transmission mechanism, a connecting rod punching mechanism, a rivetless connection mechanism, a controller and a flat die;

2. The tabletting dual-twist-lock type flat bottom rivet-free plastic connecting device according to claim 1, wherein the main shaft transmission mechanism is provided with a main shaft stepping motor, a coupler and a main shaft, the main shaft stepping motor is arranged above the front end channel, an upper main shaft bearing and a lower main shaft bearing are respectively arranged above and below the interior of the front end channel, the main shaft is rotatably arranged in the front end channel through the upper main shaft bearing and the lower main shaft bearing, the bottom of the main shaft is positioned outside the front end channel, the rivet-free connecting mechanism is arranged at the bottom of the main shaft, and the controller is electrically connected with the main shaft stepping motor.

3. The tabletting dual-twist lock type flat bottom rivet-free plastic connecting device according to claim 2, wherein the rivet-free connecting mechanism is provided with a punch connector, a punch and an outer pressing edge ring, a main shaft sliding through hole is formed in the center of the punch connector, the punch connector is slidably arranged at the bottom of the main shaft through the main shaft sliding through hole, a rectangular protrusion is arranged inside the main shaft sliding through hole, a rectangular groove is arranged at the bottom of the main shaft, the main shaft transmits torque to the punch connector through the matching of the rectangular groove and the rectangular protrusion, the punch is embedded at the bottom of the punch connector, an embedding groove is formed at the bottom of the main shaft sliding through hole, the punch is embedded in the embedding groove, an extending groove is formed at the top of the punch, and the radius of the extending groove is the same as that of the main shaft sliding through hole, the external pressure edge ring is sleeved outside the punch.

4. The tabletting dual spin lock type flat bottom rivet-free plastic connecting device according to claim 3, wherein the outer bottom side of the punch connector is provided with an external thread, a punch nut is screwed and fixed on the outer bottom side of the punch connector, and the punch nut is matched with the punch connector to fix the outer edge of the punch.

5. The tabletting dual-twist-lock type flat bottom rivet-free plastic connecting device according to claim 4, wherein a plurality of fan-shaped protrusions are uniformly arranged at the bottom of the punch nut, the same number of fan-shaped grooves are formed at the top of the outer pressing edge ring, the outer pressing edge ring is movably sleeved on the outer side of the punch nut through the fan-shaped protrusions and the fan-shaped grooves, a pressing spring is vertically arranged at the bottom of the punch nut, and the bottom of the pressing spring is connected with the inner side of the bottom edge of the outer pressing edge ring.

6. The tabletting dual-twist-lock type flat bottom rivet-free plastic connecting device according to claim 3, wherein a punch groove is formed in the bottom of the punch, a plurality of trapezoidal spiral protrusions are arranged on the outer side of the bottom of the punch, a plurality of circular arc spiral depressions are formed in the inner wall of the punch groove, an inner pressing edge ring is arranged in the punch groove, and the inner pressing edge ring is connected with the bottom surface of the punch groove through an inner pressing edge spring.

7. The tabletting dual-rotary-lock flat-bottom rivet-free plastic connecting device according to claim 6, wherein a tabletting is placed in advance at a connecting point, a plurality of tabletting protrusions are arranged on the bottom surface of the punch, the tabletting is an annular tabletting, the shape of the tabletting is the same as that of the bottom surface of the punch, a plurality of tabletting grooves are formed in the top surface of the tabletting, and the tabletting grooves correspond to the tabletting protrusions one to one.

8. The tabletting dual-spin lock type flat bottom rivet-free plastic connecting device according to claim 3, wherein the connecting rod punching mechanism is provided with two punching stepping motors, two screws and two sliders, two punching grooves are respectively formed on two sides of the case, screw bearings are fixedly arranged in the punching grooves on two sides, an output shaft of the punching stepping motor is fixedly connected with the screws, the screws are rotatably arranged in the screw bearings in a penetrating manner, threads are formed on the inner sides of the sliders, the sliders are connected with the screws through threads, the sliders on two sides are respectively provided with connecting rods, the two connecting rods are respectively connected to two sides of the rivet-free connecting mechanism, and the controller is electrically connected with the punching stepping motors on two sides.

9. The tabletting dual-twist-lock type flat bottom rivet-free plastic connecting device according to claim 8, wherein a bearing seat is sleeved on the outer side of the upper part of the punch connector, a punch rotating bearing is arranged between the bearing seat and the punch connector, connecting rod connecting parts with through holes are arranged on both sides of the bearing seat and the bottoms of the two sliding parts, the connecting rods are arranged between the bearing seat and the sliding parts in a matching way through fixing pins and the connecting rod connecting parts, and a split pin is further arranged on each fixing pin in a penetrating way.

10. A tabletting dual twist-lock type flat bottom rivet-free plastic joining method applied to the tabletting dual twist-lock type flat bottom rivet-free plastic joining apparatus according to any one of claims 1 to 9, comprising:

step three: when the punch and the pressing sheet are completely attached, the spindle stepping motor rotates slightly and drives the spindle, the connector to rotate and the punch to rotate along with the spindle stepping motor through the coupler; along with the continuous descending of the punch driven by the bearing seat, the inner pressing edge spring and the edge pressing spring are stressed and compressed to generate edge pressing force, so that the inner pressing edge ring and the outer pressing edge ring tightly press the plate; under the influence of the punch and the flat die, two layers of plate materials below the punch are stressed and extruded to flow along the radial direction, under the action of the inner blank holder and the outer blank holder, the material of the upper plate moves to the gap between the blank holder and the punch, the material of the lower plate is gathered at the neck of the upper plate, and the two layers of plate materials are hooked together to form a first mechanical lock and a second mechanical lock; the pressing sheet extrudes the plate along with the downward pressing of the punch, and the pressing sheet begins to deform and starts to flow along the radial direction along with the increase of the punching force, so that the first mechanical lock and the second mechanical lock are further extruded and enlarged; the trapezoidal spiral bulge on the outer side of the punch head extrudes the upper plate, a trapezoidal spiral recess appears at the corresponding position of the upper plate, a trapezoidal spiral recess is also formed at the corresponding position of the lower plate, and then the arc spiral deformation structures of the upper plate and the lower plate form an external spiral lock; the upper plate material on the inner side of the punch is pressed to flow into the arc spiral recess, the outer part of the corresponding part of the upper plate is provided with the arc spiral protrusion, the inner part of the upper plate is provided with the arc spiral recess, meanwhile, the lower plate flows to the arc spiral recess of the upper plate, the corresponding part of the lower plate is also provided with the arc spiral protrusion, and then the arc spiral deformation structure of the upper plate and the lower plate forms an inner spiral lock;