Wire-drawing type self-plugging rivet

Abstract

The utility model relates to the field of fasteners, and discloses a wire-drawing type self-plugging rivet, which comprises a core rod and a rivet sleeve, the core rod comprises a plastic head part, a locking part and a clamping part which are connected in sequence, the diameter of the end part of the plastic head part is larger than that of the joint of the plastic head part and the locking part, a rod body of the locking part is provided with a locking groove, and the rivet sleeve is sleeved on the core rod. A lock ring is arranged between the rivet sleeve and the core rod, and a convex ring section of the lock ring is embedded into the locking groove and connected with the locking groove in a matched mode; a neck breaking groove is further formed in the portion, close to one side of the clamping portion, of the locking portion beside the locking groove. According to the utility model, a general riveting tool can be used for riveting, the dependence on the lubrication degree of the surface of a part is reduced, and the riveting device has the beneficial effects of good riveting effect, improvement on the anti-fatigue performance and firmness of a connected machine body, reliable riveting process and reduced manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of fasteners, in particular to a wire-drawing type blind rivet. Background Art

[0002] The development of China's aviation industry has reached an unprecedented height. There are higher and higher requirements for the reliability and installation efficiency of assembly parts, and higher requirements for cost control. The research and development of new-generation aircraft requires products with higher reliability and higher strength. The skin connectors required need to meet the requirements of good reliability at the connection, strong tensile strength and low cost, so as to improve the overall performance of the aircraft and reduce the cost of the mainframe.

[0003] The wire-drawing type blind rivet is a metal connecting piece with a unique structure, high riveting strength and good reliability. It belongs to a new type of fastening part. Its structural feature is that after the core rod is pulled into the rivet body, under the action of a special riveting tool, the neck-breaking groove of the core rod will turn over into the groove of the rivet body to form a "mechanical external lock", so as to lock. It is very suitable for the skin connection of the airframe. The existing wire-drawing type blind rivets are as Figure 8 shown. The position of the locking ring 3 of this wire-drawing type blind rivet is at the locking ring groove 21 of the nail sleeve 2, and part of it is located outside the nail sleeve 2. A special riveting tool is required for riveting. Core rods 1 with different lengths and diameters require different riveting tools, and there is a great dependence on the surface lubrication of each part. If the lubrication is too good, the core rod 1 will be directly pulled through. If the lubrication is not good, the core rod 1 cannot be drawn and deformed, and the riveting quality cannot be effectively guaranteed. Content of the Utility Model

[0004] In order to overcome the problems in the above background art that the existing wire-drawing type blind rivets need to be equipped with appropriate riveting tools according to the length and diameter specifications of the core rod and have a great dependence on the surface lubrication of each part, and the quality after riveting cannot be guaranteed, the utility model provides a wire-drawing type blind rivet. By placing the locking ring between the nail sleeve and the core rod, a general riveting tool can be used for riveting, and the dependence on the surface lubrication degree of the parts can be reduced. It has the beneficial effects of good riveting effect, improved anti-fatigue performance and firmness of the connecting airframe, reliable riveting process and reduced manufacturing cost.

[0005] The technical solution of the utility model is as follows:

[0006] A wire-drawing type blind rivet includes a core rod and a nail sleeve. The core rod includes a plastic head, a locking part and a clamping part connected in sequence. The diameter of the end of the plastic head is larger than the diameter of the connection with the locking part. A locking groove is formed on the rod body of the locking part. The nail sleeve is sleeved on the core rod. A locking ring is arranged between the nail sleeve and the core rod. The convex ring section of the locking ring is embedded in the locking groove and is connected with it in a matching manner; a neck-breaking groove is also formed on the locking part of the side close to the clamping part beside the locking groove.

[0007] Preferably, a locking ring groove is provided on the inner ring side of the tail end of the nail sleeve. After riveting, the deformed section of the locking ring deforms and embeds into the locking ring groove.

[0008] Further preferably, a washer is also sleeved on the core rod, and one side of the washer abuts against the side surface of the tail end of the nail sleeve.

[0009] Further preferably, straight grooves are circumferentially provided on the rod body of the core rod between the locking part and the clamping part, and the inner ring wall of the washer is in interference fit with the straight grooves.

[0010] Preferably, the inner ring surface of the nail sleeve is in clearance fit with the core rod, and its circumference is connected with the riveting hole of the riveting plate in a mating manner.

[0011] Further preferably, the tail end of the nail sleeve is selected to be a flat round head type, a 100° countersunk head type or a 120° countersunk head type.

[0012] Preferably, a plurality of annular grooves are uniformly provided along the extending direction of the clamping part.

[0013] Preferably, the connection end of the plastic head and the locking part is a conical structure, and this conical structure guides the nail sleeve during riveting.

[0014] Preferably, the width of the notch of the locking groove is greater than the width of the bottom of the groove, and the bottom diameter of the neck-breaking groove is smaller than the bottom diameter of the locking groove.

[0015] Preferably, the core rod is made of aluminum alloy, the locking ring is made of stainless steel, and the nail sleeve is made of superalloy.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows:

[0017] 1. In the present application, the washer part is built-in, so that it can be riveted using a general riveting tool, reducing the dependence on a special riveting tool;

[0018] 2. By means of the plane at the washer, the locking ring and the locking groove of the core rod to prevent further being pulled in, and used to break the neck-breaking groove, reducing the dependence on the surface lubrication degree of the parts, and the core rod will not be pulled through due to too good lubrication degree. As long as the lubrication state is good, the riveting can be formed;

[0019] 3. The mechanical locking after the deformation of the locking ring can prevent the core rod from popping out backward, realizing a permanent connection;

[0020] 4. The wire drawing deformation process of the core rod applies a certain extrusion stress to the connected body, effectively improving the anti-fatigue performance of the connected body;

[0021] 5. Through the structural method of mechanical blocking by the washer, the reliability of the riveting process is improved and the manufacturing cost is reduced. Description of the Drawings

[0022] The present utility model will be described with reference to the accompanying drawings, where:

[0023] Figure 1 is a schematic structural view of the whole of the present utility model;

[0024] Figure 2 is a schematic structural view of the core rod of the present utility model;

[0025] Figure 3 is a schematic structural view of the nail sleeve of the present utility model;

[0026] Figure 4 is a schematic structural view of the lock ring of the present utility model;

[0027] Figure 5 is a schematic structural view of the remaining part after riveting of the present utility model;

[0028] Figure 6 is a schematic structural view during riveting of the present utility model;

[0029] Figure 7 is a schematic structural view of the whole after riveting of the present utility model;

[0030] Figure 8 is a schematic structural view of an existing drawn-core rivet.

[0031] Reference numerals: core rod 1, plastic head 11, conical structure 111, locking part 12, locking groove 121, neck-breaking groove 122, clamping part 13, ring groove 131, straight thread groove 14, nail sleeve 2, locking ring groove 21, tail end part 22, lock ring 3, convex ring section 31, deformation section 32, washer 4, riveting plate 5, riveting tool 6. Specific embodiments

[0032] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] Example 1: As Figures 1 to 7A drawn-type blind rivet as shown includes a core rod 1 and a nail sleeve 2. The core rod 1 includes a plastic head 11, a locking part 12, and a clamping part 13 that are integrally connected in sequence. The outer end diameter of the plastic head 11 is larger than the diameter at the connection with the locking part 12, that is, the connection between the plastic head 11 and the locking part 12 is arranged obliquely towards the locking part 12, which is convenient for guiding the nail sleeve 2 during riveting. Preferably, the connection between the plastic head 11 and the locking part 12 is a conical structure. This conical structure 111 guides the nail sleeve 2 during riveting to deform its body to form a bulge and fit over the plastic head 11. And during this process, the conical structure 111 is extruded and becomes smaller by the nail sleeve 2 to be drawn into shape. A locking groove 121 is circumferentially formed on the rod body of the locking part 12. The nail sleeve 2 is sleeved on the core rod 1. A lock ring 3 sleeved on the locking part 12 is provided between the nail sleeve 2 and the core rod 1. The convex ring section 31 of the lock ring 3 is embedded in the locking groove 121 and is connected with it in cooperation. The outer ring surface of the lock ring 3 is closely attached to the inner wall of the nail sleeve 2 and can be slidably connected with the conical structure 111 of the plastic head 11. That is, the nail sleeve 2 deforms and is sleeved and fixed on the plastic head 11 along the conical structure 111. The locking groove 121 is connected with the convex ring section 31 of the lock ring 3 in cooperation, so that after riveting, the convex ring section 31 of the lock ring 3 is mechanically locked in this locking groove 121 and will not automatically loosen. A neck-breaking groove 122 is also formed on the locking part 12 on the side close to the clamping part 13 beside the locking groove 121. After riveting, the core rod 1 is pulled and broken at the neck-breaking groove 122, and the tail of the core rod 1 is discarded, making the end surface after riveting flat.

[0034] Compared with the existing drawn-type blind rivets in the background art, special tools are required for riveting, and the riveting quality cannot be effectively guaranteed. In this embodiment, by placing the lock ring 3 between the nail sleeve 2 and the core rod 1, it can be riveted using a general riveting tool 6, and this connection method can better fix the nail sleeve 2 and the core rod 1, reduce the dependence on the surface lubrication of the parts, and will not pull through the core rod 1 due to too good lubrication. In addition, the mechanical locking after the deformation of the lock ring 3 can prevent the core rod 1 from popping out backward, realizing a permanent connection. The drawing deformation process of the core rod 1 applies a certain extrusion stress to the connected body, effectively improving the anti-fatigue performance of the connected body.

[0035] Embodiment 2: On the basis of Embodiment 1, the nail sleeve 2 and the lock ring 3 are preferably designed. A locking ring groove 21 is formed on the inner ring side of the tail end 22 of the nail sleeve 2, that is, a cavity is provided at this position. After riveting is completed, as Figure 5As shown, the deformed section 32 of the locking ring 3 deforms and embeds into the locking ring groove 21, that is, the locking ring groove 21 can guide the deformation of the deformed section 32 and wrap the deformed section 32 after riveting to form a mechanical lock. A washer 4 is also sleeved on the core rod 1, and one side of the washer 4 abuts against the side of the tail end portion 22 of the nail sleeve 2. During riveting, the riveting tool 6 abuts against the other side of the washer 4. During riveting, the deformed section 32 of the locking ring 3 deforms under the resistance of the washer 4 to fill the locking ring groove 21 of the nail sleeve 2, so that the core rod 1 is locked inside the nail sleeve 2 and will not rebound and become loose. The side of the washer 4 against the tail section of the core rod 1 contacts the riveting tool 6 to play a supporting role. And during the riveting process, the riveting tool 6 continuously applies pressure to the washer 4, and the washer 4 abuts against the locking ring 3, which drives the deformed section 32 to deform. After the deformation ends, one end of the deformed section 32 abuts against the convex ring section 31, and the other end abuts against the riveting tool 6 through the washer 4, so that all the pulling forces act on the neck-breaking groove 122 of the core rod 1 to break the neck-breaking groove 122. After riveting is completed, the convex ring section 31 and the deformed section 32 of the locking ring 3 are respectively in close fit with the locking groove 121 of the core rod 1 and the locking ring groove 21 of the nail sleeve 2, and the core rod 1 and the nail sleeve 2 are stably connected through the locking ring 3. Thus, through the fitting connection and interaction mode among the washer 4, the locking ring 3, the locking groove 121 of the core rod 1 and the locking ring groove 21 of the nail sleeve 2, the core rod 1 is prevented from being continuously pulled in, and the neck-breaking groove 122 can be broken at a suitable position. And as long as the lubrication state is good, the riveting can be formed, and it will not be pulled through even if the lubrication is too good. The riveting quality of the wire-drawing type blind rivet can be effectively guaranteed.

[0036] Further optimize the design of the core rod 1. A straight thread groove 14 is circumferentially provided on the rod body of the core rod 1 between the locking part 12 and the clamping part 13, that is, a circumferential straight thread is provided in the middle of the core rod 1. The straight thread groove 14 is in interference fit with the inner ring wall of the washer 4 to enhance the connection stability between the washer 4 and the core rod 1, so that the nail sleeve 2 and the washer 4 will not loosen freely.

[0037] Example 3: On the basis of Example 1, optimize the design of the nail sleeve 2 and the core rod 1. The inner ring surface of the nail sleeve 2 is in clearance fit with the core rod 1 and achieves interference fit with it after riveting, further improving the connection stability. The circumference of the nail sleeve 2 is in fit connection with the riveting hole of the riveting plate 5, and its tail end portion 22 can be selected as a flat round head type, a 100° countersunk head type or a 120° countersunk head type, which can be applicable to different types of riveting holes of the riveting plate 5, thereby improving the applicable range of the wire-drawing type blind rivet.

[0038] Example 4: On the basis of Example 1, optimize the design of the clamping part 13. A number of annular grooves 131 are evenly opened along the extending direction of the clamping part 13. The riveting tool 6 clamps the annular grooves 131 to make it have greater friction and prevent slipping.

[0039] Embodiment 5: Based on Embodiment 1, an optimized design is carried out. The width of the notch of the locking groove 121 is greater than the width of the groove bottom, which facilitates the convex ring section 31 of the locking ring 3 to be more easily engaged and connected with the locking groove 121. The diameter of the groove bottom of the neck-breaking groove 122 is smaller than the diameter of the groove bottom of the locking groove 121, which is 0.15 mm smaller in this embodiment. This setting makes the cross-sectional area of the neck-breaking groove 122 the smallest, and when all the tensile forces are concentrated here, it is easier to break at this place.

[0040] The core rod 1 is made of aluminum alloy. Aluminum alloy has the characteristics of light weight and high strength, is easy to process, and is more likely to be drawn into shape during riveting to meet the requirements; the locking ring 3 is made of stainless steel. The stainless steel ring has the characteristics of high strength and high hardness, and can have a good supporting effect after deformation, which is beneficial to maintaining the connection stability between the core rod 1 and the nail sleeve 2; the nail sleeve 2 is made of superalloy. Superalloy has good fatigue performance and fracture toughness, and is suitable for the environment in the aerospace field.

[0041] During riveting, the riveting tool 6 clamps the ring groove 131 section of the clamping part 13, and inserts the head of the core rod 1 into the riveting holes of the two layers of riveting plates 5, as Figure 6 shown. The outer shape of the riveting tool 6 abuts against the washer 4, and a tensile force is applied to the core rod 1 inside, so that the core rod 1 is pulled towards the direction of the riveting tool 6. The plastic head 11 of the core rod 1 enters the inner hole of the nail sleeve 2 to cause the nail sleeve 2 to flare and form a bulge. Until the plastic head 11 of the core rod 1 is pulled to a position close to the riveting plate 5 in the inner hole of the nail sleeve 2, the nail sleeve 2 stops deforming. As the core rod 1 continues to be pulled, the nail sleeve 2 cannot continue to deform axially under the restricting action of the riveting holes of the riveting plate 5. At this time, the core rod 1 is squeezed and thinned and forced to pass through the inner hole of the nail sleeve 2. At the same time, the locking ring 3 moves towards the tail end 22 of the nail sleeve 2 under the drive of the core rod 1 until it contacts the plane of the washer 4. After the locking ring 3 contacts the surface of the washer 4, it undergoes plastic deformation under the support of the washer 4 and fills the locking ring groove 21 of the nail sleeve 2. When the tensile force is continuously applied, under the support of the washer 4, all the tensile forces are supported by the washer 4 and the deformed locking ring 3. The locking ring 3 conducts the force to the support surface at the head end of the locking groove 121 of the core rod 1 to prevent the head end of the core rod 1 from being pulled further. Since the cross-sectional area of the neck-breaking groove 122 is the smallest, all the tensile forces are concentrated at the neck-breaking groove 122 and pull it off, as Figure 7 shown. The washer 4, the tail section of the core rod 1 are separated from the body, and the riveting is completed.

[0042] The above embodiments only illustrate the specific implementation manners of the present application, and the description is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A wire-drawing type blind rivet, comprising a core rod (1) and a nail sleeve (2), characterized in that: The core rod (1) includes a plastic head (11), a locking portion (12), and a clamping portion (13) connected in sequence. The diameter of the end of the plastic head (11) is greater than the diameter at the connection with the locking portion (12). A locking groove (121) is provided on the rod body of the locking portion (12). A nail sleeve (2) is sleeved on the core rod (1), and a locking ring (3) is provided between the nail sleeve (2) and the core rod (1). The convex ring section (31) of the locking ring (3) is embedded in the locking groove (121) and is connected therewith in a matching manner; a neck-breaking groove (122) is also provided on the locking portion (12) on the side close to the clamping portion (13) beside the locking groove (121); the connection end of the plastic head (11) and the locking portion (12) is a conical structure (111), and this conical structure (111) guides the nail sleeve (2) during riveting and becomes smaller under the extrusion of the nail sleeve (2); a washer (4) is also sleeved on the core rod (1), and one side of the washer (4) abuts against the side surface of the tail end portion (22) of the nail sleeve (2); a straight groove (14) is provided circumferentially on the rod body of the core rod (1) between the locking portion (12) and the clamping portion (13), and the inner ring wall of the washer (4) is in interference fit with the straight groove (14).

2. A wire-drawing type blind rivet according to claim 1, characterized in that: A locking ring groove (21) is provided on the inner ring side of the tail end portion (22) of the nail sleeve (2). After riveting is completed, the deformed section (32) of the locking ring (3) deforms and is embedded in this locking ring groove (21).

3. A wire-drawing type blind rivet according to claim 1, characterized in that: The inner ring surface of the nail sleeve (2) is in clearance fit with the core rod (1), and its circumference is connected in a matching manner with the riveting hole of the riveting plate (5).

4. A drawing-type blind rivet according to claim 1 or claim 3, characterized in that: The tail end portion (22) of the nail sleeve (2) is selected to be of a flat round head type, a 100° countersunk head type, or a 120° countersunk head type.

5. A wire-drawing type blind rivet according to claim 1, characterized in that: A plurality of annular grooves (131) are evenly provided on the clamping portion (13) along its extending direction.

6. The blind rivet of the drawing type according to claim 1, wherein: The width of the notch of the locking groove (121) is greater than the width of the groove bottom, and the bottom diameter of the neck-breaking groove (122) is smaller than the bottom diameter of the locking groove (121).

7. A wire-drawing type blind rivet according to claim 1, characterized in that: The core rod (1) is selected to be made of aluminum alloy, the locking ring (3) is selected to be made of stainless steel, and the nail sleeve (2) is selected to be made of superalloy.

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