CN209851625U - Drilling and riveting connecting device - Google Patents
Drilling and riveting connecting device Download PDFInfo
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- CN209851625U CN209851625U CN201822164890.6U CN201822164890U CN209851625U CN 209851625 U CN209851625 U CN 209851625U CN 201822164890 U CN201822164890 U CN 201822164890U CN 209851625 U CN209851625 U CN 209851625U
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Abstract
The utility model discloses a bore and rivet connecting device belongs to machining technical field. The drilling and riveting connecting device comprises: the center of the composite blank holder is provided with a through hole, two sides of the bottom of the composite blank holder are respectively provided with a positioning groove, a positioning block matched with the positioning groove is arranged in the positioning groove, and the positioning block can horizontally move in the positioning groove; the punching component comprises a punch head, and the punch head can reciprocate up and down in the through hole of the composite blank holder; a rivet mounted below the punch; and the female die is provided with a containing groove which can contain a deformation structure caused by riveting of the rivet. The utility model discloses an effective connection between the work piece not only can be realized to this brill riveting scheme, and the work piece is difficult for taking place brittle failure, and holistic mechanical connection efficiency obtains improving, and simple process.
Description
Technical Field
The utility model relates to the technical field of machining, in particular to bore and rivet connecting device.
Background
The development of the automobile industry is in increasingly violent conflict with the world energy and environmental problems, and the development of the automobile lightweight concept is promoted. The application specific gravity of materials with high specific strength such as high-strength steel, carbon fiber composite materials and the like on automobile bodies is increased year by year, and the transfer from high-end automobile types to middle-end automobile types is rapidly realized. Typically, for example, carbon fiber composite materials have the advantages of good impact resistance, good fatigue resistance, electrochemical corrosion resistance and the like, so that a wider space is provided for the development of the carbon fiber composite materials in the automobile industry, and the development of heterogeneous lightweight materials makes the connection technology become a hot spot of current research.
The common connection mode of the carbon fiber composite material and the metal material at the present stage comprises the following steps: bonding and mechanical joining, wherein mechanical joining further includes bolting, riveting with a rivet, riveting without a rivet, and the like. Although the bonding has the advantages of corrosion resistance, simple process, low cost and the like, the bonding strength is lower than that of other modes, and meanwhile, the surface to be connected needs to be pretreated in the bonding process so as to avoid interface failure, influence on the bonding strength and complicated processes.
For mechanical connection, because the carbon fiber composite material cannot be formed due to insufficient ductility, the carbon fiber composite material is widely drilled for connection at present or holes are prefabricated during manufacturing of carbon fiber composite material parts, so that the purpose of connection is achieved; moreover, because the plasticity of the carbon fiber composite material is poor, in the process of firstly drilling and then riveting the carbon fiber composite material and the metal material, brittle failure is easy to occur, an effective joint cannot be formed, the production process is complicated, the positioning of the connection process is influenced, the production cost is increased, and the efficiency of workpiece connection is seriously influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the prior art, the embodiment of the utility model provides a bore and rivet connecting device and bore and rivet connecting method rivets effective connection between the work piece through this brill riveting scheme not only can have been realized, and the work piece is difficult for taking place brittle failure, and holistic mechanical connection efficiency obtains improving, and simple process.
The technical scheme is as follows:
in one aspect, a drill-rivet connection device is provided, comprising:
the center of the composite blank holder is provided with a through hole, two sides of the bottom of the composite blank holder are respectively provided with a positioning groove, a positioning block matched with the positioning groove is arranged in the positioning groove, and the positioning block can horizontally move in the positioning groove;
the punching component comprises a punch head, and the punch head can reciprocate up and down in the through hole of the composite blank holder;
a rivet mounted below the punch;
and the female die is provided with a containing groove which can contain a deformation structure caused by riveting of the rivet.
Preferably, the positioning groove is a stepped positioning groove, and the positioning block is a stepped positioning block matched with the positioning groove in shape.
Preferably, the positioning block is composed of a lower protruding block located at the lower part and an upper block located at the upper part, the width of the lower protruding block is smaller than that of the upper block, and the inner side surface of the upper block and the inner side surface of the lower protruding block are both provided with curved surface structures which can be clamped and fixed with the leg parts of the rivet.
Preferably, the punch is a punch with a function of adsorbing the rivet, and/or the rivet is a stainless steel rivet, and/or the leg part of the rivet is provided with 3 or 4 leg blade parts.
Preferably, the head of the rivet has a cross-shaped groove, and the bottom end of the punch has a cross-shaped protrusion matched with the cross-shaped groove.
Preferably, the accommodating groove of the female die comprises a curved surface boss and an annular cavity, the curved surface boss is located at the center of the accommodating groove, and the annular cavity is formed by the surface of the curved surface boss and the circumferential curved surface side wall of the accommodating groove.
In another aspect, a drill-rivet connecting method of the drill-rivet connecting device according to any one of the above aspects is provided, the method including:
placing two plates to be riveted on a female die, driving a composite blank holder to move downwards, pressing the two plates tightly, feeding rivets, pushing the rivets to the upper surface of the upper plate by a punch, and limiting the rivets by using a positioning block so that the coaxiality of the rivets and the punch is in a qualified range;
starting the punch to rotate and move downwards, and drilling holes in the upper plate by the rivets by controlling the rotating speed and the feeding speed of the punch until the bottom ends of the rivet legs of the rivets reach the upper surface of the lower plate;
moving the positioning block outwards, and pushing the rivet to move downwards to perform self-piercing riveting by controlling the punching speed of the punch until the leg part of the rivet is turned outwards to form a rivet button;
and when the punch reaches the bottom dead center, the pressure of the punch is relieved, the punch moves upwards for a return stroke, and the finished riveting piece is taken down.
Preferably, the punch rotating speed is calculated by the following formula:
wherein n is the punch rotating speed; k is a radical of0The safety factor of the rotating speed of the punch is set; v0The cutting speed of the rivet material; gamma-shaped0The shear strength of the rivet material; gamma-shaped1The shear strength of the upper panel; l is the outer diameter of the leg part of the rivet; c is the actual number of the hole slots formed in the leg parts of the rivet; c. C0The reference number of the hole grooves opened on the leg parts of the rivet.
Preferably, the feed rate is calculated by the following formula:
wherein f is the feed speed; k is a radical of1A feeding speed safety factor; f. of0Is a standard feed amount; sigmaasThe allowable extrusion stress of the upper plate.
Preferably, the press speed is calculated by the following formula:
wherein v is the stamping speed; k is a stamping speed safety coefficient; l is the outer diameter of the leg part of the rivet; delta1The thickness of the upper plate; delta2Is a lower plateThe thickness of the material; gamma-shaped2The shear strength of the lower plate; a is the longitudinal section area of the accommodating groove of the concave die; sigmabsAllowable extrusion stress of the lower plate; and t is the stamping stroke time.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
1. the drilling and riveting integration is realized through the composite blank holder with the positioning and blank holding functions, the punching part with the continuous punching and riveting functions and the containing groove with a deformation structure for containing rivet riveting, and the problem that the rivet can completely penetrate through workpieces made of carbon fiber composite plates and the like only by providing large impact force during the existing self-punching riveting process is solved through reasonably controlling the rotating speed and the feeding speed of a punch in the drilling process;
2. the drilling and riveting integration can ensure that the carbon fiber composite material plate cannot be subjected to brittle failure in the drilling process, and the good mechanical property of the material is prevented from being damaged;
3. meanwhile, the riveting is directly carried out after the drilling, the problems of riveting relocation and the like in the step-by-step drilling and riveting process are avoided, the process steps and the production cost are reduced, and the riveting efficiency is improved.
Therefore, the embodiment of the utility model provides a bore and rivet connecting device and bore and rivet connecting method can be applied to between carbon-fibre composite work piece and the metal work piece, between resin matrix composite work piece and the metal sheet, between glass work piece and the metal work piece or simultaneously in the multiple riveting process between the metal work piece, have wide application prospect in the mechanical connection field.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic sectional structural view of a drilling and riveting connection device and a working state diagram of starting drilling and riveting provided by an embodiment of the invention;
fig. 2 is a schematic structural view of a composite blank holder in the drilling and riveting connection device provided by the embodiment of the present invention;
fig. 3 is a schematic sectional structural view of the drilling and riveting connection device and a working state diagram for completing drilling according to an embodiment of the present invention;
FIG. 4 is a block diagram of the composite binder ring of FIG. 2, showing a side view, a cross-sectional view, and a top view of the block;
FIG. 5 is a schematic structural view of the rivet of FIG. 1, showing a top, cross-sectional, and bottom view of the rivet;
FIG. 6 is a detailed structural view of the female mold of FIG. 1, showing a top view and a sectional structure of the female mold;
fig. 7 is a schematic view of a cross-sectional structure of the drilling and riveting connection device and a working state diagram of completing drilling and riveting provided by the embodiment of the present invention.
Description of reference numerals:
1-composite blank holder, 11-through hole, 12-positioning groove, 13-positioning block, 131-lower projection, 132-upper block, 2-punching component, 3-rivet, 31-nut, 311-cross groove, 32-nail leg part, 321-nail leg blade part, 322-hole groove, 4-female die, 41-accommodating groove, 411-curved surface boss, 412-annular cavity, 5-upper plate and 6-lower plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that the descriptions of the present invention regarding the directions of "upper portion", "lower portion", etc. are defined based on the relation of the orientation or position shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device described must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the utility model provides a bore and rivet connecting device and bore and rivet connecting method through having the compound blank holder of location and blank pressing function concurrently, realize the punching drill in succession, the punching press part of riveting function, have the storage tank of the deformation structure that the holding rivet riveting leads to, realized drilling riveting integration, through reasonable control drift rotational speed and feed rate in the process of drilling, can guarantee that carbon-fibre composite board can not take place the brittle failure in the drilling process, avoid destroying the good mechanical properties of material itself; meanwhile, the riveting is directly carried out after the drilling, the problems of riveting relocation and the like in the step-by-step drilling and riveting process are avoided, the process steps and the production cost are reduced, and the riveting efficiency is improved. Therefore, the drilling and riveting connecting device and the connecting method can be applied to various riveting procedures between carbon fiber composite material workpieces and metal workpieces, between resin matrix composite material workpieces and metal plates, between glass workpieces and metal workpieces or between metal workpieces, and have wide application prospects in the field of mechanical connection.
The following describes in detail a drill-rivet connection device and a drill-rivet connection method according to embodiments of the present invention with reference to specific embodiments and drawings.
Example 1
Fig. 1 is a schematic sectional view of a connection device for drilling and riveting and a working state diagram of beginning to drill and rivet provided by the embodiment of the present invention. As shown in FIG. 1, the embodiment of the present invention provides a drilling and riveting connection device, which mainly comprises a composite blank holder 1, a punching component 2, a rivet 3 and a female die 4.
Fig. 2 is a schematic structural diagram of a composite blank holder in the drilling and riveting connection device provided by embodiment 1 of the present invention, showing a sectional structure and a top view structure of the composite blank holder. Fig. 3 is a schematic view of a cross-sectional structure of the drilling and riveting connection device and a working state diagram for completing drilling provided by the embodiment of the present invention. FIG. 4 is a block diagram of the composite binder ring of FIG. 2, showing a side view, a cross-sectional view, and a top view of the block. As shown in fig. 2 and fig. 3, specifically, the center of the composite blank holder 1 has a through hole 11, two sides of the bottom of the composite blank holder 1 are respectively provided with a positioning groove 12, a positioning block 13 matched with the positioning groove 12 is installed in the positioning groove 12, and the positioning block 13 can horizontally move in the positioning groove 12, so as to realize the clamping position of the rivet 3. Preferably, the composite blank holder 1 is of cylindrical construction.
Preferably, the positioning groove 12 is a stepped positioning groove, and the positioning block 13 is a stepped positioning block matched with the positioning groove 12 in shape, and by adopting the positioning structure, the rivet 3 can be better positioned. As shown in fig. 1, 2 and 4, the positioning block 13 is composed of a lower protrusion 131 located at the lower part and an upper block 132 located at the upper part, the width of the lower protrusion 131 is smaller than that of the upper block 132, and the inner side surfaces of the upper block 132 and the lower protrusion 131 are both provided with curved surface structures which can be clamped and positioned with the leg parts of the rivet 3. Here, the inner side of the positioning block 13 refers to a side where the leg portion of the rivet 3 is positioned by being engaged, that is, a side of the positioning block 13 near the rivet 3 as shown in fig. 3; the outer side of the positioning block 13 is the other side away from the side where the locking is performed, that is, the other side of the positioning block relative to the inner side of the positioning block 13 as shown in fig. 3; similarly, the inner side surfaces of the upper block 132 and the lower boss 131 are the side surfaces close to the rivet 3, and the outer side surfaces of the upper block 132 and the lower boss 131 are the side surfaces far from the rivet 3. Preferably, the outer side surface of the outer upper block 132 of the positioning block 13 is flush with the outer side surface of the lower boss 131 in the vertical direction, a notch is formed between the lower side surface of the inner upper block 132 of the positioning block 13 and the inner side surface of the lower boss 131, that is, the lower boss 131 protrudes from the upper block 132 in the width direction, and the inner side of the rivet 3, which is fastened and positioned in the longitudinal direction, protrudes from the upper block 132, so that a notch is formed, and the outer side surface of the upper block 132 is flush with the outer side surface of the lower boss 131 in the vertical direction, that is, the outer side surface of the upper block 132 and the outer side surface of the lower boss 131 are. The positioning block is arranged, so that the positioning accuracy is further improved.
In addition, as shown in fig. 1, 2 and 4, the inner side surface of the upper block 132 and the inner side surface of the lower convex block 131 are both provided with a curved surface structure which can be clamped and fixed with the leg of the rivet 3, and the curved surface structures can not only ensure the clamping and fixing of the rivet 3, but also prevent the outer wall of the leg of the rivet from being damaged easily. The specific curved shape, curved surface angle or the curved surface radius of curved surface structure here can carry out corresponding setting according to actual conditions, for example can mainly carry out corresponding matching according to rivet structure or size and set up, the embodiment of the utility model provides a do not put particular restrictions to it, preferably, the curved surface structure sets up to unthreaded hole cylinder inner wall structure.
Returning again to fig. 1, the punch member 2 comprises a punch for punching a sheet or piece to be drilled and riveted, preferably a solid cylindrical structural member. When the drilling and riveting process is carried out, the punch is arranged inside the through hole 11 of the composite blank holder 1, and the punch can reciprocate up and down in the through hole 11, namely, the outer wall of the punch can slide up and down along the inner wall of the through hole. The bottom end of the punch head can be fixedly arranged with the rivet 3 and can drive the rivet 3 to rotate, and the rotating direction can rotate along the clockwise direction as shown in figure 1 or the anticlockwise direction. Preferably, the bottom end of the punch has a raised structure that can be snap-fitted or clipped into mating engagement with the lower rivet 3, such as a cross rib that mates with a rivet head having a cross groove. In addition, preferably, the punch is a punch with a rivet adsorption function, for example, a punch with a magnet adsorption function, and a magnetic adsorption force can be generated between the bottom end of the punch of the punching component and the nut of the rivet 3, so that the punch firmly adsorbs the rivet 3, and the fixing function between the punch and the rivet is further enhanced, so as to ensure the working stability of the drilling and riveting connection device.
It should be noted that the punching component 2 includes, in addition to the punch, a driving device or a driving mechanism for driving the punch to rotate and feed downward, drilling the hole on the workpiece or the plate to be drilled and riveted, and directly moving downward for punching, that is, as shown in fig. 1, the driving device or the driving mechanism of the punching component 2 drives the punch to drive the rivet 3, and the drilling and riveting process is performed on the upper plate 5 and the lower plate 6.
The rivet 3 is installed below the punch of the punch member 2 as described above, and is used for drilling and riveting the upper plate 5 and the lower plate 6. Preferably, rivet 3 is stainless steel's rivet, avoids taking place electrochemical corrosion when involving sheet metal, carbon-fibre composite panel or work piece to bore and rivet, except choosing stainless steel's rivet for use, also can adopt among the prior art other can avoid taking place electrochemical corrosion with sheet metal, carbon-fibre composite's other material rivets. In addition, according to the difference of the respective material of upper portion panel 5 and the lower part panel 6 that bore the riveting, also can carry out the adaptability to different material rivets as required and select, the embodiment of the utility model provides a do not restrict to this specially.
FIG. 5 is a schematic structural view of the rivet of FIG. 1, showing a top, cross-sectional, and bottom view of the rivet. As shown in fig. 1 and 5, the nut 31 of the rivet 3 preferably has a cross-shaped groove 311, and the bottom end of the punch has a cross-shaped protrusion matching with the cross-shaped groove 311, so that the structure can be arranged to enable the punch and the rivet to be better matched and installed; in addition, preferably, the shank 32 of the rivet 3 has 4 shank blades 321, and the shank 32 is provided with 4 hole grooves (or notches) 322, or in other embodiments, the shank of the rivet 3 has at least 3 shank blades and/or 3 hole grooves, and such a structural arrangement can ensure smooth drilling on a drilled plate (typically, a carbon fiber composite plate), so that chips are reasonably distributed in the hole grooves 322 of the shank 32 of the rivet 3, and at the same time, the rivet manufacturing process is prevented from being too complicated and the process cost is prevented from increasing. Preferably, the rivet 3 is a semi-hollow countersunk head rivet, the leg part of the rivet is of a four-leg blade part structure, the diameter range of the rivet cap is 5-8mm, the outer diameter range of the leg part of the rivet is 4-6mm, and the total length of the rivet is 5-8 mm.
Returning to fig. 1, the female die 4 is disposed at the bottom, opposite to the composite blank holder 1 above, and has a receiving groove 41 for receiving a deformed structure caused by riveting of the rivet 3. Therefore, the female die 4 mainly has two functions, one is used for placing and positioning the plates or workpieces to be riveted, such as the upper plate 5 and the lower plate 6 in fig. 1, and the other is used for accommodating the deformed structure caused by riveting the rivet 3 through the drilling and riveting process by arranging the accommodating groove 41, so that the riveting of the workpieces can be smoothly realized. The deformed structure caused by rivet riveting refers to a material downward protruding structure or deformed structure caused by riveting of two workpieces after rivet riveting is completed. Because the sunk shape of storage tank 41 is related to the deformation structure that rivet 3 riveted and lead to, consequently, according to the different brill of different brill riveting technologies rivet power or dynamics, rivet type, different work piece panel riveting deformation's difference or a plurality of factor synthesize the different rivet riveting deformation structure that leads to, storage tank 41's concrete sunk shape or cell wall structural shape, can carry out corresponding matching according to different situations and set up, as long as it can realize the utility model discloses the holding rivet riveting that explains rivet the deformation structure that leads to can, the embodiment of the utility model provides a do not put particular restriction to it.
Fig. 6 is a detailed structural view of the female mold of fig. 1, showing a top view structure and a sectional structure of the female mold. As shown in fig. 1 and 6, the receiving groove 41 of the female die 4 includes a curved surface boss 411 and an annular cavity 412, the curved surface boss 411 is located at the center of the receiving groove 41, the annular cavity 412 is formed by the surface of the curved surface boss 411 and the circumferential curved side wall of the receiving groove 41, and the rotation axis of the annular cavity 412 is collinear with the rotation axis of the curved surface boss 411. The annular cavity structure of the annular cavity 412 is convenient for accommodating a deformed structure caused by riveting of a rivet, and the smooth curved surface of the curved surface boss 411 can avoid extrusion or damage possibly caused to the deformed structure caused by riveting. Thus, preferably, the curved boss 411 is provided as a conical boss and the cavity wall of the annular cavity 412 is also provided as a smooth or smoothly curved wall. In addition preferably, the curved surface tangent line of curved surface boss 411 and the contained angle of vertical direction are 45 °, in addition, curved surface angle, the crooked degree of curved surface boss 411 and the curved surface angle, the crooked degree of annular chamber 412, can also adopt any other possible setting modes among the prior art according to actual need, the embodiment of the utility model provides a do not put particular restrictions to it.
Fig. 7 is a schematic view of a cross-sectional structure of the drilling and riveting connection device and a working state diagram of completing drilling and riveting provided by the embodiment of the present invention.
The above has described the concrete structure of the drilling and riveting connection device provided by the embodiment of the present invention in detail, and the following introduces the operation method and working process of drilling and riveting the drilling and riveting connection device.
Referring to fig. 1, 3 and 7, it may operate as follows:
as shown in fig. 1, an upper plate 5 and a lower plate 6 to be riveted are placed on a female die 4, a composite blank holder 1 is driven to move downwards to press the two plates 5 and 6, a rivet 3 is fed through a feeding device, a punch of a punching part 2 pushes the rivet 3 to the upper surface of the upper plate 5, the rivet 3 is limited by a positioning block 13, and the positioning block 13 clamps the rivet 3, so that the coaxiality of the rivet 3 and the punch is in a qualified range;
as shown in fig. 3, the punch is started to move downwards, and the high-quality drilling of the rivet 3 on the upper plate 5 is completed by controlling the rotating speed and the feeding speed of the punch until the bottom end of the leg of the rivet 3 reaches the upper surface of the lower plate 6, namely the punch descends until the bottom end of the leg of the rivet 3 contacts with the upper surface of the lower plate 6, and the feeding is stopped;
moving the positioning block 13 outwards, namely moving the positioning block 13 to two sides to a preset station, reserving the riveting position of the rivet 3, pushing the rivet 3 to move downwards to perform self-piercing riveting by controlling the punching speed of the punch until the nail leg part of the rivet 3 is turned over towards the periphery to form a rivet button, and thus forming a firm locking structure between the upper plate 5 and the lower plate 6;
and (7) when the punch reaches the bottom dead center, releasing the pressure of the punch, moving upwards for a return stroke, taking off the finished rivet, and preparing for the next drilling and riveting process, namely repeating the process.
Preferably, in the drilling and riveting connection device provided by the embodiment of the present invention, the punch rotation speed of the punch of the punching component 2 is calculated by the following formula:
wherein n is the punch rotating speed; k is a radical of0For the safety factor of the rotating speed of the punch, the rotating speed of the punch is prevented from being too high due to the safety factor, and k is reasonably controlled0The value of (2) enables the rotating speed of the punch to be in a safe range, and the preferable value range is 0.1-1; v0The cutting speed of the rivet material; gamma-shaped0The shear strength of the rivet material; gamma-shaped1The shear strength of the upper panel; l is the outer diameter of the leg part of the rivet; c is the actual number of the hole slots formed in the leg parts of the rivet; c. C0The reference number of the hole grooves for the leg parts of the rivet is not less than 3.
Exemplarily, k0Value of (2) 0.67, V0The cutting speed of Q235 steel is 5 m/s; gamma-shaped0The shear strength of Q235 steel is 98Mpa, c0And taking a value of 3, wherein the values of other parameters except the parameters are determined according to the actual measurement result or the actual situation.
Preferably, in the drilling and riveting connection device provided by the embodiment of the present invention, the feeding speed of the punch of the punching component 2 is calculated by the following formula:
wherein f is the feed speed; k is a radical of1For the safety factor of the feeding speed, the feeding speed is prevented from being overlarge due to the safety factor, and k is reasonably controlled1The value of (a) enables the feeding speed to be within a safe range, and the preferable value range is 0.1-1; f. of0Is a standard feed amount; sigmaasThe allowable extrusion stress of the upper plate.
Exemplarily, k1Taking the value of 0.1; f. of0Taking the value of 80mm/min, sigmaasIs determined according to actual measured results or actual conditions.
Preferably, in the drilling and riveting connection device provided by the embodiment of the present invention, the punching speed of the punch of the punching component 2 is calculated by the following formula:
wherein v is the stamping speed; k is a stamping speed safety coefficient, the stamping speed is prevented from being too high due to safety factors, the value of k is reasonably controlled to enable the stamping speed to be within a safety range, and the preferable value range is 0.1-1; l is the outer diameter of the leg part of the rivet; delta1The thickness of the upper plate; delta2The thickness of the lower plate; gamma-shaped2The shear strength of the lower plate; a is the longitudinal section area of the accommodating groove of the concave die; sigmabsAllowable extrusion stress of the lower plate; and t is the stamping stroke time.
Illustratively, k takes a value of 0.67; t takes 0.1-0.2s, and the values of other parameters except the parameters are determined according to the actual measurement result or the actual situation.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the optional embodiment of this utility model, and the repeated description is no longer given here.
Example 2
Referring to fig. 1, fig. 3 and fig. 7, a drilling and riveting connection method provided by embodiment 2 of the present invention mainly includes the following steps:
as shown in fig. 1, an upper plate 5 and a lower plate 6 to be riveted are placed on a female die 4, a composite blank holder 1 is driven to move downwards to press the two plates 5 and 6, a rivet 3 is fed through a feeding device, a punch of a punching part 2 pushes the rivet 3 to the upper surface of the upper plate 5, the rivet 3 is limited by a positioning block 13, and the positioning block 13 clamps the rivet 3, so that the coaxiality of the rivet 3 and the punch is in a qualified range;
as shown in fig. 3, the punch is started to move downwards, and the high-quality drilling of the rivet 3 on the upper plate 5 is completed by controlling the rotating speed and the feeding speed of the punch until the bottom end of the leg of the rivet 3 reaches the upper surface of the lower plate 6, namely the punch descends until the bottom end of the leg of the rivet 3 contacts with the upper surface of the lower plate 6, and the feeding is stopped;
moving the positioning block 13 outwards, namely moving the positioning block 13 to two sides to a preset station, reserving the riveting position of the rivet 3, pushing the rivet 3 to move downwards to perform self-piercing riveting by controlling the punching speed of the punch until the nail leg part of the rivet 3 is turned over towards the periphery to form a rivet button, and thus forming a firm locking structure between the upper plate 5 and the lower plate 6;
and (7) when the punch reaches the bottom dead center, releasing the pressure of the punch, moving upwards for a return stroke, taking off the finished rivet, and preparing for the next drilling and riveting process, namely repeating the process.
Preferably, the punch rotation speed is calculated by the following formula:
wherein n is the punch rotating speed; k is a radical of0For the safety factor of the rotating speed of the punch, the rotating speed of the punch is prevented from being too high due to the safety factor, and k is reasonably controlled0The value of (2) enables the rotating speed of the punch to be in a safe range, and the preferable value range is 0.1-1; v0The cutting speed of the rivet material; gamma-shaped0The shear strength of the rivet material; gamma-shaped1The shear strength of the upper panel; l is the outer diameter of the leg part of the rivet; c is the actual number of the hole slots formed in the leg parts of the rivet; c. C0The reference number of the hole grooves for the leg parts of the rivet is not less than 3.
Exemplarily, k0Value of (2) 0.67, V0The cutting speed of Q235 steel is 5 m/s; gamma-shaped0The shear strength of Q235 steel is 98Mpa, c0And taking a value of 3, wherein the values of other parameters except the parameters are determined according to the actual measurement result or the actual situation.
Preferably, the above-mentioned feed rate is calculated by the following formula:
wherein f is the feed speed; k is a radical of1For feed speed safetyCoefficient, for safety reasons, to avoid excessive feed speed, by rational control of k1The value of (a) enables the feeding speed to be within a safe range, and the preferable value range is 0.1-1; f. of0Is a standard feed amount; sigmaasThe allowable extrusion stress of the upper plate.
Exemplarily, k1Taking the value of 0.1; f. of0Taking the value of 80mm/min, sigmaasIs determined according to actual measured results or actual conditions.
Preferably, the press speed is calculated by the following formula:
wherein v is the stamping speed; k is a stamping speed safety coefficient, the stamping speed is prevented from being too high due to safety factors, the value of k is reasonably controlled to enable the stamping speed to be within a safety range, and the preferable value range is 0.1-1; l is the outer diameter of the leg part of the rivet; delta1The thickness of the upper plate; delta2The thickness of the lower plate; gamma-shaped2The shear strength of the lower plate; a is the longitudinal section area of the accommodating groove of the concave die; sigmabsAllowable extrusion stress of the lower plate; and t is the stamping stroke time.
Illustratively, k takes a value of 0.67; t takes 0.1-0.2s, and the values of other parameters except the parameters are determined according to the actual measurement result or the actual situation.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the optional embodiment of this utility model, and the repeated description is no longer given here.
To sum up, the embodiment of the utility model provides a bore and rivet connecting device and bore and rivet connecting method compares prior art, has following beneficial effect:
1. the drilling and riveting integration is realized through the composite blank holder with the positioning and blank holding functions, the punching part with the continuous punching and riveting functions and the containing groove with a deformation structure for containing rivet riveting, and the problem that the rivet can completely penetrate through workpieces made of carbon fiber composite plates and the like only by providing large impact force during the existing self-punching riveting process is solved through reasonably controlling the rotating speed and the feeding speed of a punch in the drilling process;
2. the drilling and riveting integration can ensure that the carbon fiber composite material plate cannot be subjected to brittle failure in the drilling process, and the good mechanical property of the material is prevented from being damaged;
3. meanwhile, the riveting is directly carried out after the drilling, the problems of riveting relocation and the like in the step-by-step drilling and riveting process are avoided, the process steps and the production cost are reduced, and the riveting efficiency is improved.
Therefore, the embodiment of the utility model provides a bore and rivet connecting device and bore and rivet connecting method can be applied to between carbon-fibre composite work piece and the metal work piece, between resin matrix composite work piece and the metal sheet, between glass work piece and the metal work piece or simultaneously in the multiple riveting process between the metal work piece, have wide application prospect in the mechanical connection field.
It should be noted that: in the above-described embodiment, when the drilling-riveting connection device implements the drilling-riveting connection function, only the division of the above functional modules is taken as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above-described functions. In addition, the drilling and riveting connection method provided by the embodiment and the drilling and riveting connection device belong to the same concept, and the specific implementation process is described in the method embodiment and is not described again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A drill-rivet connection device, comprising:
the center of the composite blank holder is provided with a through hole, two sides of the bottom of the composite blank holder are respectively provided with a positioning groove, a positioning block matched with the positioning groove is installed in the positioning groove, the positioning block can horizontally move in the positioning groove, the positioning groove is a stepped positioning groove, and the positioning block is a stepped positioning block matched with the positioning groove in shape;
the punching component comprises a punch head, and the punch head can reciprocate up and down in the through hole of the composite blank holder;
a rivet mounted below the punch;
and the female die is provided with a containing groove which can contain a deformation structure caused by riveting of the rivet.
2. The device of claim 1, wherein the positioning block is composed of a lower projection at the lower part and an upper block at the upper part, the width of the lower projection is smaller than that of the upper block, and the inner side surface of the upper block and the inner side surface of the lower projection are both provided with a curved surface structure which can be clamped and positioned with the leg part of the rivet.
3. The device according to claim 1, characterized in that the punch is a punch with a function of sucking a rivet, and/or the rivet is a rivet of stainless steel material, and/or the leg of the rivet has 3 or 4 leg blades.
4. The device of claim 1, wherein the head of the rivet has a cross-shaped groove and the bottom end of the punch has a cross-shaped protrusion that mates with the cross-shaped groove.
5. The device according to any one of claims 1 to 4, wherein the receiving groove of the female die comprises a curved boss and an annular cavity, the curved boss is located at the center of the receiving groove, and the annular cavity is formed by the surface of the curved boss and the circumferential curved side wall of the receiving groove.
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| CN201822164890.6U CN209851625U (en) | 2018-12-21 | 2018-12-21 | Drilling and riveting connecting device |
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| CN201822164890.6U CN209851625U (en) | 2018-12-21 | 2018-12-21 | Drilling and riveting connecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109514877A (en) * | 2018-12-21 | 2019-03-26 | 汽-大众汽车有限公司 | A kind of brill riveting attachment device and bore riveting connection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109514877A (en) * | 2018-12-21 | 2019-03-26 | 汽-大众汽车有限公司 | A kind of brill riveting attachment device and bore riveting connection method |
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