CN203599461U - Self-piercing riveting device between ultrahigh-strength steel plates or between ultrahigh-strength steel plate and aluminum alloy plate - Google Patents

Abstract

The utility model discloses a self-piercing riveting device between ultra-high-strength steel plates or with aluminum alloy plates, in order to overcome the problem that the high strength of the ultra-high-strength steel plates cannot be punched and riveted. It includes a compound punch (1), a compound blank holder (6), a compound die (15) and a laser heating control part. The composite blank holder (6) is stacked on the top of the composite die (15) for contact connection, the composite punch (1) is placed in the center hole of the composite blank holder (6) for sliding connection, the first optical fiber tube ( 2) Put it into the first hollow hole (4) of the composite punch (1) for threaded connection, and the first concave lens (3) is installed in the first hollow hole (4) under the first optical fiber tube (2) , the distance from the bottom surface of the first concave lens (3) to the bottom surface of the composite punch (1) is 1-2 mm, the first concave lens (3) and the first optical fiber tube (2) are threaded, the composite punch (1) , Composite blank holder (6) and the rotary axis of composite die (15) are collinear.

Description

Self-piercing riveting device between ultra-high-strength steel plates or with aluminum alloy plates

technical field

The utility model relates to a processing device in the field of automobile manufacturing, more precisely, the utility model relates to a self-piercing riveting device between ultra-high-strength steel plates or between ultra-high-strength steel plates and aluminum alloy plates. the

Background technique

In recent years, energy and environmental issues have become increasingly prominent, prompting the rapid development of lightweight technology in the automotive industry. It has become the most important means to reduce the weight of the car body by using a large number of lightweight and high-strength materials (such as high-strength steel plates, aluminum alloys, and magnesium alloys, etc.) to achieve significant weight reduction. the

When welding steel plates, as the steel strength level increases, the welding stability will decrease, the plastic toughness will deteriorate, the crack sensitivity will increase, and the performance of the heat-affected zone will change, which will reduce the performance of the components. Therefore, the traditional spot welding connection process is very difficult. It is difficult to realize the connection between ultra-high-strength steel plates without destroying the mechanical properties of ultra-high-strength steel plates. At the same time, due to the large difference in physical properties such as thermal conductivity and thermal expansion coefficient between light alloys such as aluminum and magnesium and high-strength steels, and the characteristics that the contact surface is easy to alloy with copper electrodes to form oxide films, traditional resistance spot welding There are various defects in the bonding technology, bonding technology, and solid phase connection technology, which cannot realize the connection of ultra-high-strength steel and aluminum alloy. the

Self-piercing riveting technology is a new mechanical connection technology for thin plate materials that has developed rapidly in recent years. The self-piercing riveting process can meet the connection requirements of light materials such as steel or aluminum. There is no chemical reaction during the riveting process. Its static tensile force and fatigue resistance are better than the spot welding process, and the plate does not need to be drilled when riveting. The steps are simplified, the cost is saved, and it is suitable for the high-efficiency production of automobile bodies, and effectively overcomes various problems caused by spot welding. the

When the existing self-piercing riveting technology is riveting light alloy workpieces with poor plasticity such as aluminum and magnesium alloys, it is easy to cause radial cracks in the bottom material to reduce the fatigue performance of the joint, and some brittle cracks may even directly lead to joint failure. When riveting ultra-high-strength steel plates, because the material strength limit is too high (the strength limit of ultra-high-strength steel plates is generally above 1500Mpa), the deformation resistance is relatively large, and the corresponding ductility, plastic deformation, and other low-strength non-ferrous metal materials (such as aluminum alloys, ordinary low-strength steel plates) have poor connectivity. Therefore, self-piercing riveting between ultra-high-strength steel plates and between ultra-high-strength steel plates and aluminum alloys: on the one hand, the requirements for equipment punching riveting capacity and rivet strength are increased; on the other hand, ultra-high-strength steel plates that are difficult to deform make The formability of the joint is poor and the connection quality is not high. the

When the temperature exceeds 950°C, the steel plate will completely transform into austenite. Austenite has good ductility, and the formability of the plate will be greatly enhanced at this time. At the same time, the temperature of the sheet during riveting is between 600°C and 800°C. At this time, the strength of the sheet will decrease to about 300Mpa when the strain rate is 10/s. the

Using this property of ultra-high-strength steel to preheat the steel plate during the riveting process is beneficial to the forming of the plate, so as to obtain a riveted part with good performance and good shape, and at the same time reduce the riveting force and frame stiffness of the self-piercing riveting riveting equipment caused by high-strength riveting materials requirements. the

The quenching rate has an important influence on the mechanical properties of the steel plate after forming. Only when the cooling rate is higher than 27°C/s can the steel plate be completely transformed into high-strength martensite after hot forming, thereby obtaining an ultra-high-strength steel plate. the

Contents of the invention

The technical problem to be solved by the utility model is to overcome the problem that the existing technology cannot realize the connection between ultra-high-strength steels and ultra-high-strength steels and aluminum alloys under the premise of ensuring that the mechanical properties of ultra-high-strength steel plates are not affected. A self-piercing riveting device between ultra-high-strength steel plates or between ultra-high-strength steel plates and aluminum alloy plates. the

In order to solve the above technical problems, the utility model is realized by adopting the following technical scheme: the self-piercing riveting device between the ultra-high-strength steel plates or with the aluminum alloy plate includes a composite punch, a composite blank holder, a composite die and laser heating Control section. the

The composite punch includes a first optical fiber tube and a first concave lens;

The composite blank holder is stacked on the top of the composite die for contact connection, the composite punch is placed in the center hole of the composite blank holder for sliding connection, and the first optical fiber tube is inserted into the first hollow circular hole of the composite punch for Threaded connection, the first concave lens is installed in the first hollow circular hole under the first optical fiber tube, and the first concave lens and the first optical fiber tube are threaded. the

The ring-shaped cavity in the composite die, that is, the concave mold cavity and a concave die boss, are laid with 8 left-right symmetrical cylindrical cooling water channels at 1 mm below, and the radius of the cylindrical cooling water channels is 0.5-2 mm. the

The distance between the bottom surface of the first concave lens and the bottom surface of the compound punch described in the technical solution is 1-2 mm, and the compound punch, the compound blank holder and the rotation axis of the compound die are collinear. the

The composite blank holder described in the technical solution includes four No. 1 thermistors with the same structure. The composite binder ring is a ring structure, the center of the composite binder ring is processed with a central through hole, and the bottom ring surface of the composite binder ring is provided with at least 4 rectangular grooves at the lower end of the binder ring in the circumferential direction , the four rectangular grooves at the lower end of the binder ring are not connected to the central through hole of the composite binder ring, but are connected to the square groove at the lower end of the binder ring arranged along the diameter direction on the outer side. 4 No. 1 thermistors with the same structure are arranged in the rectangular groove at the lower end of the binder ring, and the wires at the lower end of the binder ring connected to the 4 No. 1 thermistors with the same structure are respectively arranged in the 4 binder rings with the same structure In the square groove at the lower end, four No. 1 thermistors with the same structure protrude from the bottom surface of the composite blank holder. the

The composite concave mold described in the technical solution includes a second optical fiber tube, a second concave lens, and four No. 2 thermistors with the same structure. The second optical fiber tube is inserted into the second hollow circular hole at the center of the composite die, the second optical fiber tube and the second hollow circular hole are threaded, and the second concave lens is installed in the second hollow circular hole at the top of the second optical fiber tube Inside, the second concave lens and the second optical fiber tube are threadedly connected, and four No. 2 thermistors with the same structure are arranged in the rectangular groove at the upper end of the die on the top surface of the composite die. The wires at the upper end of the die connected to the No. thermistor are respectively arranged in square grooves at the upper ends of four dies with the same structure, and the four No. 2 thermistors with the same structure protrude from the upper surface of the composite die (15). the

The distance between the top surface of the second concave lens (18) described in the technical solution and the upper surface of the composite concave mold (15) is 1-2mm,

The composite die described in the technical proposal is a disc-type structural part, and an annular cavity, namely the concave mold cavity and a die boss are arranged at the center of the top of the composite die, and the annular cavity of the composite die is formed by an inner cylinder The surface, the annular curved surface of the bottom and the conical surface of the concave mold boss at the center are formed. The concave mold boss is located in the center of the annular cavity. The top surface of the boss is coplanar with the top surface of the composite die, and a second vertical hollow hole is processed at the center of the die boss, and at least a pair of dies are arranged on the top face of the composite die (15) The upper rectangular groove (8), the rectangular groove at the upper end of the die is not connected to the cavity of the die, but communicates with the square groove at the upper end of the die arranged along the same diameter outside the rectangular groove at the upper end of the die. the

Compared with the prior art, the beneficial effects of the utility model are:

1. Due to the high thermal conductivity and easy oxidation of the surface of non-ferrous metals such as magnesium and aluminum alloys, it is difficult to realize the connection between aluminum and magnesium alloy sheets by traditional spot welding connection technology. Especially when dissimilar metals such as steel and aluminum-magnesium alloy are spot welded, due to the large difference in melting point and thermal expansion coefficient, hard and brittle metal compounds appear in the solder joints during welding, making it difficult to achieve effective welded joints. The utility model effectively solves this problem by adopting the self-piercing riveting of mechanical connection, and avoids the generation of cracks in the riveting forming process of brittle materials. Realize the connection between ultra-high-strength steel and between ultra-high-strength steel and aluminum alloy. the

2. As the strength level of high-strength steel increases, the welding stability of the steel plate will decrease, the plastic toughness will deteriorate, the crack sensitivity will increase, and the performance of the heat-affected zone will change, which will reduce the performance of the component. The strength of ultra-high-strength steel is very high (above 1500Mpa), and the existing spot welding technology is difficult to weld ultra-high-strength steel plates without affecting the mechanical properties of ultra-high-strength steel. At the same time, because the strength limit of ultra-high-strength steel is too high, the existing self-piercing riveting device cannot connect ultra-high-strength steel or between ultra-high-strength steel and aluminum alloy. Aiming at this situation, the utility model adds a laser heater on the basis of the traditional self-piercing riveting device to locally heat the riveting area of the riveting part to make it completely austenitized. Due to the good ductility of austenite, the The strength limit of the material is increased, and the ductility and fluidity of the material are increased. In this way, the requirements for the punching riveting die and the riveting force required for riveting ultra-high-strength steel are reduced, making the self-piercing riveting connection of ultra-high-strength steel feasible, and at the same time making it easier to form a firm mechanical interlock between the plates, improving the quality of the joint. overall connection quality. the

3. Self-piercing riveting after laser heating the ultra-high-strength steel plate. If the quenching rate of the steel plate in the riveting area is lower than 27°C/s after the riveting is completed, the austenite cannot be completely transformed into martensite, and the strength limit will drop to 600Mpa (1/3 of the original strength limit of ultra-high-strength steel plates), the mechanical properties of ultra-high-strength steel cannot be guaranteed. In view of this situation, the utility model adopts the method of cooling the rivets in the liquid nitrogen cooling chamber in advance, so that the temperature of the rivets is lowered to below 0°C, and at the same time, a cooling water channel is laid near the riveting area of the die and then passed through the cooling water channel. The method of adding cooling water, so as to control the quenching rate in the riveting process to exceed 27°C/s, obtain a fully martensitic ultra-high-strength steel plate, and ensure that the mechanical properties of the ultra-high-strength steel will not be affected. the

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Figure 1 is a full sectional view on the front view of the structure of the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention;

Figure 2 is a full sectional view on the front view of the composite binder ring structure used in the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention;

Fig. 3 is the bottom view of the composite blank holder structure used in the self-piercing riveting device between the ultra-high strength steel plates or aluminum alloy plates described in the present invention;

Fig. 4 is a full cross-sectional view on the front view of the composite die structure used in the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention;

Fig. 5 is the top view of the composition of the composite die structure adopted by the self-piercing riveting device between the ultra-high strength steel plate or the aluminum alloy plate described in the utility model;

Figure 6-a is the laser heating process for riveting work using the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention;

Figure 6-b is the process of stopping heating and feeding the rivet by using the self-piercing riveting device between the ultra-high-strength steel plates described in the present invention or with the aluminum alloy plate for riveting work;

Figure 6-c is the process of using the self-piercing riveting device between the ultra-high-strength steel plates or the aluminum alloy plate described in the present invention for the rivet to contact the sheet material for riveting work;

Figure 6-d shows the process of using the self-piercing riveting device for riveting between ultra-high-strength steel plates or aluminum alloy plates described in the present invention. The punch moves to the bottom dead center, the rivets are completely riveted with the plates, and the riveting ends ;

Figure 6-e is the reset process of the punch that uses the self-piercing riveting device described in the present invention between ultra-high-strength steel plates or with aluminum alloy plates for riveting work;

In the figure: 1. Composite punch, 2. The first optical fiber tube, 3. The first concave lens, 4. The first hollow hole, 5. Rivet, 6. Composite blank holder, 7. Rectangular groove at the lower end of the blank holder , 8. Rectangular groove at the upper end of the die, 9. Wire at the lower end of the blank holder, 10. Wire at the upper end of the die, 11. Square groove at the lower end of the blank holder, 12. Square groove at the upper end of the die, 13. Upper sheet, 14. Lower plate, 15. Composite die, 16. Concave mold cavity, 17. Second optical fiber tube, 18. Second concave lens, 19. Second hollow circular hole, 20. Cooling water channel. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail:

Referring to Fig. 1, the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention includes a composite punch 1 (including a first optical fiber tube 2 and a first concave lens 3), a composite blank holder 6 (including 4 No. 1 thermistors with the same structure), composite concave mold 15 (including the second optical fiber tube 17, the second concave lens 18, 4 No. 2 thermistors with the same structure) and the laser heating control part. Composite binder ring 6 and composite die 15 are stacked up and down, and composite punch 1 is placed in the central hole of composite binder ring 6 for sliding connection. The composite binder ring 6, composite punch 1 and composite die 15 The axis of rotation is collinear, that is, the coaxial arrangement. the

The composite punch 1 is a hollow cylindrical structure, the center of the composite punch 1 is provided with a first hollow hole 4 along the axial direction, the inner wall of the first hollow hole 4 is provided with threads, the composite punch 1 The first optical fiber tube 2 and the first concave lens 3 are arranged in the first hollow circular hole 4 of the. the

The first optical fiber tube 2 is fixedly connected by threads in the first hollow circular hole 4 of the composite punch 1, and the bottom end of the first optical fiber tube 2 is provided with a first concave lens 3, between the first concave lens 3 and the first optical fiber tube 2 For threaded connection, the distance between the first concave lens 3 and the bottom surface of the compound punch 1 is 1-2mm, and the point light source output by the first optical fiber tube 2 diverges and irradiates the heated material at a certain angle through the transmission effect of the first concave lens 3. The upper surface of the riveted upper panel 13. the

The first concave lens 3 with an appropriate curvature is selected so that the irradiated laser circular area on the upper surface of the upper sheet 13 is the sheet riveting forming area. the

Referring to Fig. 1 and Fig. 2, the composite binder ring 6 is a ring-shaped structural part, the center of the composite binder ring 6 is processed with a central through hole, and the ring surface of the composite binder ring 6 is at least evenly distributed. There is a pair of rectangular grooves 7 at the lower end of the binder ring, the rectangular groove 7 at the lower end of the binder ring is not connected to the central hole of the composite binder ring 6, and is connected to the square groove at the lower end of the binder ring on the outside along the diameter direction. 11 connected. A thermistor is arranged in the rectangular groove 7 at the lower end of the binder ring, and the lead wire 9 at the lower end of the binder ring connected to the thermistor is arranged in the square groove 11 at the lower end of the binder ring. The thermistor protrudes from the bottom surface of the composite blank holder 6 to ensure good contact between the thermistor and the upper plate 13 . the

Referring to Fig. 4 and Fig. 5, the composite die 15 is a disc structure, and the center of the top surface of the composite die 15 is provided with an annular cavity, that is, a die cavity 16 and a die boss. The structural shape of the annular cavity is adapted to the structural shape of the rivet 5, so that the rivet 5 can better open and enter the concave mold cavity 16 when it invades the sheet material, so as to form a mechanical interlock with the upper sheet material 13 and the lower sheet material 14 . The concave mold boss is located at the center of the annular cavity, the rotation axis of the concave mold convex platform is collinear with the rotary axis of the annular cavity, and the top surface of the concave mold convex platform is coplanar with the top surface of the composite concave mold 15, that is, the height is equal. A second vertical hollow circular hole 19 is processed at the center of the concave mold boss, and a second optical fiber tube 17 and a second concave lens 18 are installed in the second hollow circular hole 19 . The inwall of the second hollow circular hole 19 is provided with screw thread, is threaded connection between the second optical fiber tube 17 and the second hollow circular hole 19, is threaded fixed connection between the second optical fiber tube 17 and the second concave lens 18, and the second concave lens The top surface of 18 is 1 to 2 mm away from the upper surface of the composite concave mold 15, and the point light source output by the second optical fiber tube 17 diverges and irradiates the heated lower sheet to be riveted through the transmission of the second concave lens 18 at a certain angle 14 of the lower surface. the

The second concave lens 18 with an appropriate curvature is selected so that the irradiated laser circular area on the lower surface of the lower sheet 14 is the sheet riveting forming area. the

Lay left and right symmetrical eight cylindrical cooling channels 20 at 1mm below the cavity 16 of the composite die 15, the radius range of the cooling channels 20 is 0.5-2mm, and after the riveting is completed, the cooling water is introduced to make the sheet The temperature of the riveting forming area is rapidly cooled to achieve the purpose of rapid quenching and riveting of the upper sheet 13 and the lower sheet 14. the

On the top surface of the composite die 15, at least a pair of rectangular grooves 8 at the upper end of the die are evenly arranged circumferentially. The square groove 12 at the upper end of the die is connected. The thermistor is arranged in the rectangular groove 8 at the upper end of the die, and the wire 10 at the upper end of the die connected to the thermistor is arranged in the square groove 12 at the upper end of the die. The thermistor protrudes from the top surface of the composite die 15 to ensure good contact between the thermistor and the lower plate 14 . the

The rivet 5 is a semi-hollow countersunk rivet made of high-strength steel to meet riveting requirements. The diameter of the head is 5-8mm, the outer diameter of the leg is 4-6mm, and the length of the rivet is 6-8mm. the

Composite punch 1, composite blank holder 6, and composite die 15 are all made of very high hardness die steel, such as Cr12MoV and the like. the

The laser heating control part is composed of a power supply, a main board, a laser driver board, a temperature control board, a system control board, an optical fiber laser output module, a heat dissipation and cooling module, an optical fiber connector, and an optical fiber tube, among which the laser control module can be purchased from the market . the

The fiber laser output module is installed in the cooling module to ensure that the temperature of the fiber laser output module is normal during continuous operation. The output laser of the fiber laser output module is connected to the fiber through the fiber connector, and is incident through the first fiber tube 2 in the compound punch 1 and the first concave lens 3 and the second fiber tube 17 and the second concave lens 18 in the compound die 15 On the upper sheet material 13 and the lower sheet material 14 to be riveted. the

The thermistor on the composite blank holder 6 and the composite die 15 can monitor and heat the temperature of the upper panel 13 and the lower panel 14 in time, when the temperature of the upper panel 13 and the lower panel 14 reaches the target temperature The connected control system terminates the laser heating, and starts the composite punch 1 for riveting forming. the

When the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the utility model is working, the upper plate 13 and the lower plate 14 to be riveted are first stacked on the composite die 15, and then the composite press is driven The edge ring 6 presses the upper plate 13 and the lower plate 14. At this time, the fiber laser output module is controlled to output the laser, and the laser is irradiated sequentially through the first optical fiber tube 2, the first concave lens 3, the second optical fiber tube 17, and the second concave lens 18. On the forming area of the upper sheet material 13 and the lower sheet material 14 . The forming area of the upper sheet 13 and the lower sheet 14 heats up instantaneously under the laser irradiation, and the upper sheet 13 and the lower sheet 14 to be riveted are detected immediately by the thermistor on the composite blank holder 6 and the composite die 15 When the temperature reaches the optimum riveting temperature, stop heating, feed the rivet 5 through the feeding device, and then start the composite punch 1 (quickly) to descend for riveting. First, the composite punch 1 pushes the rivet 5 downwards to gradually press the upper sheet 13, and penetrates the upper sheet 13 smoothly. At the same time, the annular part (circle foot) of the rivet 5 also begins to expand outward, and the shape of the die forces the rivet 5 to The ring portion (ring foot) enters the lower panel 14. Under the combined action of the compound punch 1 and the compound die 15, the ring part (circle foot) of the rivet 5 is opened to the periphery to form a rivet buckle, thereby forming a firm mechanical internal locking structure between the upper sheet 13 and the lower sheet 14 . The upper plate 13 and the lower plate 14 at high temperature have good ductility, so the cracks during the riveting process of the upper plate 13 and the lower plate 14 are avoided, and the riveting of high-strength steel is also reduced. The riveting force between the upper panel 13 and the lower panel 14. During the riveting process, heat exchange occurs between the low-temperature rivet 5 and the high-temperature upper and lower plates 13 and 14, and at the same time, the cooling water channel 20 is fed with cooling water to quench the upper and lower plates 13 and 14 of high-strength steel , to ensure that riveted parts with good mechanical properties are obtained. After the riveting is completed, the composite punch 1 is lifted to return to the initial position, and the riveting process of the upper plate 13 and the lower plate 14 of the ultra-high-strength steel heated by laser is completed. the

Example

Referring to Fig. 1, the self-piercing riveting device between ultra-high-strength steel plates or aluminum alloy plates described in the present invention includes a composite punch 1 (including a first optical fiber tube 2 and a first concave lens 3), a composite blank holder 6 (including 2 to 4 thermistors with the same structure), composite concave mold 15 (second optical fiber tube 17, second concave lens 18, thermistor). the

Composite binder ring 6 and composite die 15 are stacked up and down, composite punch 1 is put into the central hole of composite binder ring 6, and the rotation axes of composite binder ring 6, composite punch 1 and composite die 15 are Lines are arranged coaxially. the

The first optical fiber tube 2 is connected with the first hollow circular hole 4 on the composite punch 1 by threads, the bottom end of the first optical fiber tube 2 is arranged with a first concave lens 3, and the bottom surface of the first concave lens 3 is far from the bottom surface of the composite punch 1 The distance is 1mm. the

The composite punch 1 is a hollow cylindrical structure, the bottom diameter of the composite punch 1 is 5 mm, the diameter of the first hollow hole 4 is 3 mm the same as that of the first optical fiber tube 2, and the radius of the fillet at the bottom edge of the composite punch 1 is 0.5 mm. the

The initial position of the bottom surface of the composite punch 1 is 9mm away from the upper sheet 13, and the focal length of the selected first concave lens 3 is f=6mm. the

Referring to Fig. 2, the composite blank holder 6 is provided with four square grooves 11 at the lower end of the blank holder with a width of 2 mm along two mutually perpendicular diameter directions on the bottom surface, and there are respectively provided on the cylindrical surface near the center hole. The width and height are 4mm, and the length is the rectangular groove 7 at the lower end of the blankholder ring of 6mm. The thermistor is arranged in the rectangular groove 7 at the lower end of the binder ring. In order to ensure that the thermistor can fully contact the upper sheet 13, the lower surface of the thermistor exceeds the bottom surface of the composite binder ring 6 by 1 mm. The wire 9 at the lower end of the bezel is arranged in the square groove 11 at the lower end of the bezel. the

Referring to Fig. 4, the concave mold cavity 16 at the center of the composite die 15 is made up of the surrounding inner cylindrical surface, the annular curved surface at the bottom and the conical surface of the concave mold boss at the center, and the diameter of the inner cylindrical surface is 10mm. The distance between the bottom of the cavity 16 and the upper surface of the die is 1.5 mm, and the top surface of the convex platform of the die is coplanar with the upper surface of the composite die 15 . the

The center of the concave mold cavity 16 of the composite die 12 is processed with a second hollow circular hole 19 at the center of the concave mold boss, and the diameter of the second hollow circular hole 19 is the same as the diameter of the second optical fiber tube 17, which is 2mm, and The second optical fiber tube 17 is fixed in the second hollow circular hole 19 by threads, the top of the second optical fiber tube 17 is arranged with a second concave lens 18, and the distance between the upper surface of the second concave lens 18 and the top end surface of the concave mold boss is 1 mm. . the

The focal length of the selected second concave lens 18 is f=1.44mm. the

Referring to Fig. 5, four square grooves 12 at the upper end of the die with a width of 2 mm are provided on the upper surface of the composite die 15 along two mutually perpendicular diameter directions, and near the inner cylindrical surface of the die cavity 13 Respectively, a rectangular groove 8 at the upper end of the die with a width and height of 4mm and a length of 6mm is provided. The thermistor is arranged in the rectangular groove 8 at the upper end of the die. In order to ensure that the thermistor can fully contact the lower sheet 14 to be riveted, the upper surface of the thermistor is 1 mm higher than the upper surface of the composite die 15 and is connected to the thermistor The wire 10 at the upper end of the die is arranged in the square groove 12 at the upper end of the die. the

The upper plate 13 riveted in this embodiment is 5083 aluminum alloy material, the lower plate 11 is a dual-phase high-strength steel plate, and the thickness of the upper plate 10 and the lower plate 11 are both 1 mm. the

In the riveting process, the punching speed of the composite punch 1 is 100mm/min, and the stroke distance of the composite punch 1 is the distance between the bottom surface of the composite punch 1 and the upper sheet 13 and the depth of the composite punch 1 intruding into the upper sheet 13. In sum, the stroke of composite punch 1 in this embodiment is 12.5mm. the

In this embodiment, the laser output power of the fiber laser output module is adjusted to 0.1 Kw to heat the upper plate 13 , and the laser output power of the fiber laser output module is adjusted to 1 Kw to heat the lower plate 14 . the

The process of riveting work using laser local heating self-piercing riveting device: 

As shown in Figure 6-a to Figure 6-e:

1. Referring to Figure 6-a, before self-piercing riveting, the rivet 5 is cooled first, and the temperature of the rivet 5 reaches 0°C in the liquid nitrogen cooling room, and the temperature is kept for 5 minutes, so that the rivet 5 can be riveted during the riveting process. The riveted position of the upper plate 13 and the lower plate 14 is rapidly quenched. Before the self-piercing riveting of the upper sheet 13 and the lower sheet 14, heat the riveting position of the upper surface of the upper sheet 13 and the lower surface of the lower sheet 14, the upper sheet 13 is aluminum alloy heated to 300°C, and the lower Sheet 14 is an ultra-high-strength steel plate heated to 910°C. The temperature of the upper sheet 13 and the lower sheet 14 is measured in real time through the thermistors arranged on the bottom surface of the composite blank holder 6 and the upper surface of the composite die 15. When the temperature reaches the requirement, the heating is terminated by the laser heating control part. the

2. Referring to Figure 6-b, after the low-temperature rivets 5 treated in the cooling chamber are fed into the mold by the belt-type nail-feeding mechanism driven by the ratchet, the composite blank holder 6 and the composite die 15 pass through the guide post and guide sleeve in the equipment The guide guarantees the coaxiality, that is, the coaxiality of the composite punch 1, the rivet 5 and the composite die 15 is ensured, and then the upper panel 13 and the lower panel 14 are self-pierced riveted. During the riveting process, the low-temperature rivet 5 and the high-temperature upper sheet 13 contact the lower sheet 14 for heat exchange, and the temperature drop rate of the upper sheet 13 and the lower sheet 14 reaches 27°C/s, realizing alignment of the upper sheet. 13 and rapid quenching of the lower sheet 14. the

3. Referring to Figure 6-c, the composite punch 1 drives the rivet 5 downwards to touch the upper surface of the upper sheet 13 . the

4. Referring to Fig. 6-d, as the lower plate 14 flows into the cavity 16 of the composite die 15, the annular part (ring foot) of the rivet 5 also begins to expand outward. The die cavity 16 forces the annular portion (ring foot) of the rivet 5 into the lower panel 14 . The rivet 5 is opened to the periphery under the joint action of the compound punch 1 and the compound die 15 to form a rivet buckle, thereby forming a firm mechanical internal locking structure between the upper plate 13 and the lower plate 14 . the

Claims (6)

1. Between a super-high strength steel plate or with the self-piercing riveting device of aluminium alloy plate, comprise LASER HEATING control section, it is characterized in that, between described super-high strength steel plate or with the self-piercing riveting device of aluminium alloy plate, also comprise compound punch (1), compound blank holder (6) and compound concave die (15);

   Described compound punch (1) comprises the first optical fiber tube (2) and the first concavees lens (3);

   What compound blank holder (6) was stacked in compound concave die (15) is contact connection above; compound punch (1) is placed in the centre bore of compound blank holder (6) as being slidably connected; the first optical fiber tube (2) packs in the first hollow circular hole (4) of compound punch (1) for being threaded; the first concavees lens (3) are arranged in the first optical fiber tube (2) the first hollow circular hole (4) below, between the first concavees lens (3) and the first optical fiber tube (2) for being threaded;

   Annular die cavity in described compound concave die (15) is that symmetrical 8 columniform cooling water channels (20) are laid at the 1mm place, below of concave die cavity (16) and a die boss, and the radius of columniform cooling water channel (20) is 0.5～2mm.
2. According between super-high strength steel plate claimed in claim 1 or with the self-piercing riveting device of aluminium alloy plate, it is characterized in that, the bottom surface of described the first concavees lens (3) is 1～2mm to the distance of compound punch (1) bottom surface, the axis of rotation conllinear of described compound punch (1), compound blank holder (6) and compound concave die (12).
3. According between super-high strength steel plate claimed in claim 1 or with the self-piercing riveting device of aluminium alloy plate, it is characterized in that, described compound blank holder (6) comprises 4 No. 1 thermistors that structure is identical;

   Described compound blank holder (6) is torus structural member, the center of compound blank holder (6) is processed with central through hole, on the base ring face of compound blank holder (6), hoop is at least provided with 4 blank holder lower end rectangular recess (7), 4 blank holder lower end rectangular recess (7) are not communicated with the central through hole of compound blank holder (6), and are connected with the blank holder lower end square groove (11) arranging along diametric(al) in its outside;

   4 No. 1 identical thermistors of structure are arranged in blank holder lower end rectangular recess (7), the blank holder conducting wire at lower end (9) that No. 1 thermistor identical with 4 structures connects is arranged in the blank holder lower end square groove (11) that 4 structures are identical, and 4 No. 1 identical thermistors of structure protrude from the bottom surface of compound blank holder (6).
4. According between super-high strength steel plate claimed in claim 1 or with the self-piercing riveting device of aluminium alloy plate, it is characterized in that, described compound concave die (12) includes the second optical fiber tube (17), the second concavees lens (18), 4 No. 2 thermistors that structure is identical;

   The second optical fiber tube (17) inserts in the second hollow circular hole (19) of compound concave die (15) center, between the second optical fiber tube (17) and the second hollow circular hole (19) for being threaded, the second concavees lens (18) are arranged in the second hollow circular hole (19) on the second optical fiber tube (17) top, between the second concavees lens (18) and the second optical fiber tube (17) for being threaded, 4 No. 2 identical thermistors of structure are arranged in the die upper end rectangular recess (8) on compound concave die (15) top end face, the die upper end wire (10) that No. 2 thermistors identical with 4 structures connect is arranged in the die upper end square groove (12) that 4 structures are identical, 4 No. 2 identical thermistors of structure protrude from the upper surface of compound concave die (15).
5. According between super-high strength steel plate claimed in claim 4 or with the self-piercing riveting device of aluminium alloy plate, it is characterized in that, the top end face of the second described concavees lens is 1～2mm to the distance of compound concave die upper surface.
6. According between super-high strength steel plate claimed in claim 1 or with the self-piercing riveting device of aluminium alloy plate, it is characterized in that, described compound concave die (15) is disc-like structural member, it is concave die cavity (16) and a die boss that the center on compound concave die (15) top arranges an annular die cavity, the annular die cavity of compound concave die (15) is by inner cylinder face, the taper seat composition of the annular surface of bottom and the die boss of center, die boss is positioned at the center of annular die cavity, the axis of rotation conllinear of the axis of rotation of die boss and annular die cavity, the top end face of the end face of die boss and compound concave die (15) is coplanar, be processed with the second vertical hollow circular hole (19) in the center of die boss, a pair of die upper end rectangular recess (8) is at least set on the top end face of compound concave die (15), die upper end rectangular recess (8) is not communicated with concave die cavity (16), and be connected with the die upper end square groove (12) arranging along same diameter in die upper end rectangular recess (8) outside.

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