Environment-friendly bolt

Abstract

The utility model discloses an environment-friendly bolt, and belongs to the field of fasteners. The environment-friendly bolt comprises a head part and a rod part which are sequentially arranged, a coupling portion, an eco-friendly portion, a threaded portion, and a guide portion. Through the ingenious design, the stud structure and the forming process are optimized, and meanwhile due to the fact that materials are reduced, the cost is correspondingly reduced; the weight of the bolt is reduced, and compared with a traditional fuel vehicle, the load of an engine is reduced, and fuel consumption is reduced; energy conservation, emission reduction, environmental protection and energy conservation of the automobile are facilitated; meanwhile, carbon emission is reduced; for a new energy automobile, the endurance mileage is prolonged; for the environment-friendly weight-reducing bolts and products of the same series, due to the fact that the lengths of the combining parts are the same, the products of the same series and the head rod can be combined only through one set of mold, the mold opening number is reduced, and the mold opening cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the fastener field especially relates to an environmental protection type bolt. BACKGROUND

[0002] With the continuous development of the automobile industry, lightweight has become one of the important trends of automobile design. Especially in the field of new energy vehicles, due to the large weight of the battery, the demand for lightweight of the whole vehicle is more urgent. As an important connecting component, the bolt also faces the demand for lightweight development.

[0003] Although the automobile lightweight has many advantages, it also faces some challenges. In terms of materials, the cost of new lightweight materials such as carbon fiber is high, which limits its large-scale application. Moreover, the processing technology of some new materials is complex, which requires special equipment and technical personnel. At the same time, the automobile lightweight cannot be at the expense of safety performance, how to reduce the weight while ensuring or improving the crash safety and other performances of the automobile is a problem that automobile engineers need to continuously pay attention to and solve. SUMMARY

[0004] To solve the above technical problems, the utility model provides an environmental protection type bolt.

[0005] The technical scheme of the utility model is: an environmental protection type bolt, comprising a head part and a rod part arranged in sequence, the rod part comprises:

[0006] a connecting part, the connecting part connects the head part, and the diameter of the connecting part is the maximum diameter of the rod part;

[0007] an environmental protection part, the environmental protection part is connected with the connecting part, and the diameter of the environmental protection part is smaller than that of the connecting part;

[0008] a threaded part, the threaded part is connected with the environmental protection part, and the threaded part is provided with a connecting thread, the outer diameter of the connecting thread is greater than the diameter of the environmental protection part, and the inner diameter of the connecting thread is not greater than the diameter of the environmental protection part;

[0009] a guide part, the guide part is arranged on the outer side of the threaded part, and the guide part guides the bolt into the mounting hole.

[0010] Further, the environmental protection type bolt is directly formed by cold heading. Generally, a mold can be used, different lengths of molds are set according to different categories of products, and cold heading machines are used for integrated stamping forming. The structural strength of the stud is ensured.

[0011] Further, the threaded part is provided with the connecting thread by using a thread rolling device. The setting of the thread can be realized.

[0012] Further, the guide part comprises an inclined part and an insertion part, the inclined part is arranged with a reduced diameter inwardly, and the insertion part has a diameter smaller than the environmental protection part.

[0013] Further, the threaded part is arranged in cooperation with the nut, and all the threaded parts are connected with the nut.

[0014] Further, a guide installation groove is arranged in the nut, and a guide part is arranged in the guide installation groove.

[0015] Further, the rod part passes through at least two connecting base bodies, and the two connecting base bodies comprise a first thick base body and a second accessory base body, the first thick base body is a base piece, and the second accessory base body is an accessory.

[0016] Further, the environmental protection part of the rod part is at least partially located in the first thick base body.

[0017] Further, the length sum of the combination part and the environmental protection part is not less than the thickness of the at least two connecting base bodies.

[0018] Further, at least part of the combination part is arranged in all the connecting base bodies.

[0019] The beneficial technical effects of the utility model are: through ingenious design, the stud structure and forming process are optimized, and due to the reduction of materials, the cost is also reduced accordingly; the weight of the bolt is reduced, the load of the engine is reduced for traditional fuel vehicles, and fuel consumption is reduced; it is helpful to promote the energy saving and emission reduction and environmental protection and energy saving of automobiles; meanwhile, carbon emissions are reduced; for new energy vehicles, the cruising range is prolonged; the number of die opening and cost are reduced: for traditional bolts, due to the different lengths of the head rod combination part, each product needs a set of mould, for the environmental protection and weight reduction bolt, due to the same length of the combination part, so the head rod combination of the same series of products only needs a set of mould, the number of die opening is reduced, and the die opening cost is saved. DRAWINGS

[0020] Figure 1 It is the whole schematic view of the environmental protection type bolt.

[0021] Figure 2 It is the schematic view of the existing bolt.

[0022] Figure 3 is an assembled cross-sectional view.

[0023] Figure 4 is an assembled perspective view.

[0024] Figure 5 is a schematic view of a long environment-friendly bolt.

[0025] wherein:

[0026] 1, head, 2, joint, 3, environmental protection, 4, threaded portion, 5, guide, 51, inclined portion, 52, insertion portion, 6, nut, 61, guide installation slot, 7, connecting base. DETAILED DESCRIPTION

[0027] In order to make the technical means of the utility model more clearly understood, and can be implemented according to the content of the specification, the specific embodiments of the utility model are further described in detail below, the following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0028] Referring to the environment-friendly bolt shown in the drawings, comprising head 1 and rod portion arranged in sequence, rod portion includes: Figures 1-5 Joint 2, joint 2 connects head 1, and the diameter of joint 2 is the maximum diameter of the rod portion;

[0029] Environmental protection 3, environmental protection 3 is connected with joint 2, and the diameter of environmental protection 3 is less than that of joint 2;

[0030] Threaded portion 4, threaded portion 4 is connected with environmental protection 3, and threaded portion 4 is provided with connecting thread, and the outer diameter of connecting thread is greater than the diameter of environmental protection 3, and the inner diameter of connecting thread is not greater than the diameter of environmental protection 3;

[0031] Guide 5, guide 5 is arranged on the outer side of threaded portion 4, and guide 5 guides the bolt into the installation hole.

[0032]

[0033] ​Further, the environment-friendly bolt is directly formed by cold heading. Generally, a die can be used, different lengths of dies are set according to different types of products, and cold heading machines are used for integrated stamping forming. The structural strength of the stud is ensured. The bolt uses the CBP136L multi-station cold heading integrated machine. The forming process uses: first, blanking, first station pre-heading, second station pre-heading cylindrical head, third station tail section (the rod is too long, the head cannot be formed by once binding), fourth station binding the head and thick rod, fifth station binding the hexagonal and forming the toothed rod diameter, and sixth station heading the hexagonal flange head and the tail part chamfering in the die. The product formed by the multi-station cold heading reduces material waste, saves time, and greatly improves production efficiency. The weight of the blanking is controlled within 0.5 grams, and the weight of the same batch is controlled within 0.1 grams. The cold heading speed reaches 80 pieces per minute.

[0034] Further, the threaded part 4 is provided with a connecting thread by a toothed equipment. The setting of the thread can be realized.

[0035] Further, the guide part 5 includes an inclined part 51 and an insertion part 52, the inclined part 51 is provided with an inwardly reduced diameter, and the insertion part 52 has a smaller diameter than the environment-friendly part 3. It can not only reduce weight, but also realize the guiding function.

[0036] Further, the threaded part 4 is provided with a connecting thread by a toothed equipment. The setting of the thread can be realized.

[0037] Further, the guide installation groove 61 is provided in the nut 6, and the guide part 5 is provided in the guide installation groove 61. That is, this matching arrangement can ensure the stability of the connection.

[0038] Further, the rod part passes through at least two connecting base bodies 7, and the two connecting base bodies 7 include: a first thick base body and a second accessory base body, the first thick base body is a base piece, and the second accessory base body is an accessory. That is, the base piece is used as the first thick base body, and the product or other accessories are arranged on the base piece, so that the stable installation of the accessories can be realized. The environment-friendly part 3 of the rod part is at least partially located in the first thick base body. It is ensured that this part of space can realize the effect of weight reduction. The sum of the lengths of the connecting part 2 and the environment-friendly part 3 is not less than the thickness of the at least two connecting base bodies 7. The connection of the bolt is generally to connect the two connecting base bodies 7, so it is necessary to ensure the connection length to realize the stable connection.

[0039] Further, at least part of the connecting part 2 is provided in all the connecting base bodies 7. The stability of each connecting base body 7 is ensured, and shaking is avoided.

[0040] Through ingenious design, the stud structure and forming process are optimized, and the cost is also reduced due to the reduction of the material; the weight of the bolt is reduced, which reduces the load of the engine and reduces fuel consumption for traditional fuel vehicles; it helps to promote energy saving and emission reduction and environmental protection of automobiles; at the same time, carbon emissions are reduced; for new energy vehicles, the cruising range is extended; the number of dies is reduced and the cost is reduced: for traditional bolts, due to the different lengths of the head rod combination part 2, each product needs a set of molds, and for the environmental protection and weight reduction bolts, the same series of products, as shown in Figure 5 , due to the same length of the combination part, the same series of products, the head rod combination only needs a set of molds, which reduces the number of dies and saves the cost of opening the mold.

[0041] The environmental protection and weight reduction high-strength bolt adopts high-speed steel SKH55, 63-65HRC, and is plated with titanium. The concave die structure adopts a layer of pre-stressed structure to increase the pre-stress, and the die core adopts tungsten steel material EA65 with a hardness of 85HRA.

[0042] The bundle rod die sizing belt width difference of the bundle rod is controlled within 0.01mm, and the perpendicularity of the inner hole is controlled within 0.01mm, and the upper and lower two die cores with sizing belts are set to ensure that the rod part is not easy to bend and deform in the bundle rod process. Due to the long rod diameter, in order to prevent the concave die pin from breaking, the hole diameter difference between the concave die pad and the concave die pin is within 0.03mm; the flange head and tail chamfer forming station adopts a butterfly protective sleeve design.

[0043] In the mold design process, modeling can be done through three-dimensional design software, and the cold heading process can be simulated by using simulation software Simufact.

[0044] The surface heat treatment technology requirements of the environmental protection and weight reduction high-strength bolt: the environmental protection and weight reduction high-strength bolt needs to meet the performance requirements of standard 8.8 or above, and is produced by using Taiwan San Yong continuous mesh belt furnace equipment. The equipment falling material place is well treated to prevent bumping to prevent thread bumping injury.

[0045] The surface treatment requirements of the environmental protection and weight reduction high-strength bolt: the environmental protection and weight reduction high-strength bolt adopts electroplated zinc-nickel, black, nickel content: 12%-16%, passivation, no hexavalent chromium, upper sealant, 8-16um, friction coefficient: 0.10-0.16, 80±5℃ hot storage for 24 hours, 3 weeks without white rust, 4 weeks without red rust.

[0046] The electroplated zinc-nickel layer can avoid corrosion of the bolt, thereby ensuring the strength and service life of the bolt. Zinc has good corrosion resistance and sacrificial anode protection performance. When the zinc plating layer is damaged, zinc can be preferentially corroded as the anode of the original battery, thereby protecting the base metal from corrosion. The nickel layer has good chemical stability and is not easy to be oxidized and corroded.

[0047] The multi-station cold heading process can form a bolt with a longer length, and the multi-station cold heading process can complete multiple machining processes in a single mold operation to ensure the precision and consistency of the bolt; the butterfly-shaped protective sleeve design protects the concave mold pin from being broken when forming a longer bolt.

[0048] The austenite isothermal quenching process is used for surface treatment, which can form lower bainite structure, and compared with the traditional martensite structure, has lower internal stress and higher ductility, so as to realize the lightweight of the bolt under the same strength.

[0049] In summary, the innovation of the project lies in its systematic attention to the whole research and development process, including the innovation of materials, production process, structural design and other aspects, aiming to develop a new type of environmentally friendly light-weight high-strength bolt with higher performance and reliability.

[0050] The straight hole mold core material of the environmentally friendly light-weight high-strength bolt is tungsten steel EA65 with a hardness of 85HRA; the bundle rod mold core material of the environmentally friendly light-weight high-strength bolt is tungsten steel KG5 with a hardness of 88.5HRA; the material used for the environmentally friendly light-weight high-strength bolt is 10B21; the cold heading production rate of the environmentally friendly light-weight high-strength bolt is 80 per minute; and the friction coefficient is 0.10-0.16.

[0051] The above is only the preferred embodiment of the present application, and is not used to limit the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, can make a number of improvements and modifications, these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An environmentally friendly bolt, characterized by comprising: The bolt comprises a head (1) and a shank, which are arranged in sequence, wherein the shank comprises: a connecting portion (2) connected with the head (1), and the diameter of the connecting portion (2) is the maximum diameter of the shank; an environmental protection portion (3) connected with the connecting portion (2), and the diameter of the environmental protection portion (3) is smaller than that of the connecting portion (2); a threaded portion (4) connected with the environmental protection portion (3), and the threaded portion (4) is provided with connecting threads, the outer diameter of the connecting threads is larger than the diameter of the environmental protection portion (3), and the inner diameter of the connecting threads is not larger than the diameter of the environmental protection portion (3); and a guide portion (5) arranged outside the threaded portion (4), and the guide portion (5) guides the bolt into a mounting hole.

2. The environment-friendly bolt according to claim 1, characterized in that: The environmental protection bolt is formed by cold upsetting.

3. The environmentally friendly bolt according to claim 1, characterized in that: The threaded portion (4) is provided with the connecting threads by using a thread rolling device.

4. The environmentally friendly bolt according to claim 1, wherein: The guide portion (5) comprises an inclined portion (51) and an insertion portion (52), the inclined portion (51) is arranged in a manner that the diameter is reduced inwardly, and the diameter of the insertion portion (52) is smaller than that of the environmental protection portion (3).

5. The environmentally friendly bolt of claim 1, wherein: The threaded portion (4) is arranged in cooperation with a nut (6), and the threaded portion (4) is connected with the nut (6).

6. The environmentally friendly bolt according to claim 5, characterized in that: A guide installation groove (61) is arranged in the nut (6), and the guide portion (5) is arranged in the guide installation groove (61).

7. The environmentally friendly bolt of claim 1, wherein: The shank passes through at least two connecting substrates (7), and the at least two connecting substrates (7) comprise a first thick substrate and a second accessory substrate, the first thick substrate is a base, and the second accessory substrate is an accessory.

8. The environmentally friendly bolt according to claim 7, characterized in that: The environmental protection portion (3) of the shank is at least partially arranged in the first thick substrate.

9. The environmentally friendly bolt of claim 7, wherein: The sum of the lengths of the connecting portion (2) and the environmental protection portion (3) of the shank is not smaller than the thickness of the at least two connecting substrates (7).

10. The environmentally friendly bolt of claim 7, wherein: At least a part of the connecting portion (2) is arranged in all the connecting substrates (7).

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