CN108994538B

CN108994538B - Method for manufacturing engine cover hinge

Info

Publication number: CN108994538B
Application number: CN201810866468.7A
Authority: CN
Inventors: 何丽平; 胡秀俊; 文佳思; 李军
Original assignee: Wuhan Shangjiasheng Auto Parts Co ltd
Current assignee: Wuhan Shangjiasheng Auto Parts Co ltd
Priority date: 2018-08-01
Filing date: 2018-08-01
Publication date: 2020-11-06
Anticipated expiration: 2038-08-01
Also published as: CN108994538A

Abstract

The invention provides a method for manufacturing a hinge of an engine cover, relates to the technical field of hinges, and solves the technical problem of excessively low machining precision of the hinge. Comprises the following steps: s1, sequentially performing trimming, bending and shaping steps on the plate for manufacturing the hinge to form a matching surface; s2, punching the matching surface to form a first hole; s3, expanding the diameter, and punching the first hole in a scraping mode to form a second hole; and S4, shaping each shape surface of the hinge.

Description

Method for manufacturing engine cover hinge

Technical Field

The invention relates to the technical field of hinges, in particular to a method for manufacturing a hinge of an engine cover.

Background

The hinge assembly, particularly the hood hinge, is located in the engine front compartment, and is complicated in shape due to a small space in the vehicle body and the use of the hood hinge for connecting key parts for hood opening and closing. The engine cover hinge is hereinafter referred to as a hinge and comprises a hinge fixed page and a hinge movable page. Riveting holes for connecting the hinge fixed leaf and the hinge movable leaf are respectively punched on the hinge fixed leaf and the hinge movable leaf and are riveted through rivets.

At present, the design and manufacturing process of the hinge by various manufacturers in the industry sequentially comprises the following steps of S1 forming the external shape of the hinge, S2 punching riveting holes on the hinge, and S3 adopting a manual correction mode to ensure the matching precision requirement of the hinge.

Fig. 4 is a schematic diagram of a punched section structure in the manufacturing process of the hinge in the prior art, wherein fig. 4 is a schematic diagram. The punched section of the riveting hole of the hinge formed by the existing manufacturing process sequentially comprises a first punching collapsed angle A1, a first bright belt B1, a first fracture belt C1 and a first burr D1 from top to bottom. The first press corner a1 is an R-shaped portion pressed in when the punched piece is cut by the cutting edge during punching, the first bright strip B1 is a surface where the punched piece and the cutting edge are in contact with each other to be glossy during punching, the first fracture strip C1 is a serrated surface after the punched piece is cut and separated by the cutting edge during punching, and the first burr D1 is a sharp portion after cracking after the punched piece is cut and separated by the cutting edge during punching. When the hinge hole of the hinge is riveted with the rivet, the first bright belt B1 is a contact surface with the rivet, and the shorter the first bright belt B1 is, the shorter the matching surface length between the riveting hole and the rivet is, thereby reducing the verticality of riveting. The first bright band B1 represents 20% to 40% of the entire hole wall length, i.e. the vertical length of the punched hole section. The first fracture zone C1 has a zigzag surface, so that a gap is formed between the riveting hole and the rivet at the first fracture zone C1, and the longer the first fracture zone C1 is, the more the gap between the riveting hole and the rivet is increased, thereby reducing the verticality of riveting. In fig. 4, the first bright band B1 is shorter and the first fracture band C1 is longer, so that the contact area of the rivet and the wall of the riveting hole is too small, and the machining and assembling precision of the hinge is low. The requirement of the riveting fit precision of the hinge fixed leaf and the hinge movable leaf can not be met, and the requirements of the flatness and the parallelism of the fit surface and the installation precision between the hinge and the installation hole of the vehicle body can not be met.

Disclosure of Invention

The invention aims to provide a method for manufacturing an engine cover hinge, which aims to solve the technical problem that the hinge in the prior art is low in machining precision. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a method for manufacturing a hood hinge, which comprises the following steps: s1, sequentially performing trimming, bending and shaping steps on the plate for manufacturing the hinge to form a matching surface; s2, punching the matching surface to form a first hole; s3, expanding the diameter, and punching the first hole in a scraping mode to form a second hole; and S4, shaping each shape surface of the hinge.

The riveting method has the advantages that the first hole is formed by implementing the punching step on the matching surface, the second hole is formed by implementing the punching step on the first hole in a diameter expanding mode, so that the length of the bright belt of the second hole is increased, the length of the effective matching surface between the riveting hole and the rivet is further effectively increased, and the riveting verticality is ensured. And the hinge is shaped, so that the riveting precision of the hinge and the assembling precision between the hinge and the vehicle body mounting hole can be improved.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, in the method for manufacturing the engine cover hinge, the diameter of the second hole is less than or equal to 8mm, and the diameter of the first hole is less than that of the second hole by 1 mm.

Further, in the method for manufacturing the engine cover hinge, the diameter of the second hole is larger than 8mm, and the diameter of the first hole is 88-92% of the diameter of the second hole.

Further, in the method of manufacturing a hood hinge, the diameter of the first hole is 90% of the diameter of the second hole.

Further, the method for manufacturing the engine cover hinge includes a riveting matching surface and a vehicle body installation matching surface.

Further, in the method of manufacturing a hood hinge, the step of punching the riveted mating face in the step S2 forms the first hole.

Further, the method for manufacturing a hood hinge according to the present invention may further include forming a third hole by performing a punching step on the body attachment mating surface while forming the second hole in step S3.

Further, in the method of manufacturing a hood hinge, the shaping step in the step S4 includes a first shaping step performed to reduce the flatness and parallelism tolerance of the mating surface.

Further, in the method for manufacturing a hood hinge, the shaping step in the step S4 further includes a second shaping step performed to improve accuracy of mounting the hinge to a vehicle body mounting hole.

Further, the method of manufacturing a hood hinge, wherein the mating surface includes a riveted mating surface, and the first shaping step is performed on the riveted mating surface.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a method of manufacturing a hood hinge according to the present invention;

FIG. 2 is a schematic structural diagram of a punched hole section after step S3 according to the present invention;

FIG. 3 is a cross-sectional view of the hinge and rivet assembly of the present invention;

fig. 4 is a schematic view of a punched section structure in a hinge manufacturing process in the prior art.

In the figure 1-first hole, 2-second hole, 3-riveted mating surface, 4-vehicle body installation mating surface, 5-third hole, 10-rivet, 20-hinge.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The present invention provides a method of manufacturing a hood hinge, comprising the steps of: and S1, sequentially performing the steps of trimming, bending and shaping on the plate for manufacturing the hinge to form a matching surface. S2, a punching step is performed on the mating face to form a first hole 1. S3, the expanded diameter is punched out of the first hole 1 in the form of a scrape-off to form a second hole 2. And S4, shaping each shape surface of the hinge.

Specifically, as shown in fig. 1 to 3, fig. 1 shows a method of manufacturing a hood hinge according to the present invention. Fig. 2 is a schematic structural diagram of a punched section after the step S3 of the hinge of the present invention. FIG. 3 is a cross-sectional view of the hinge and rivet assembly of the present invention. The steps of trimming, bending and shaping the hinge plate in step S1 are the same as those of the prior art, and are not described herein again. The first hole 1 formed in step S2 is used as a pre-punched hole, and the second hole 2 formed in step S3 is used as a hole to be actually hinged or attached to the vehicle body, or may be a riveting hole of a fine punched hole. Through implementing the step of punching a hole (second hole 2) in advance after punching a hole (first hole 1) in advance, because the cutting of punching a hole in advance is based on punching a hole, the cutting output is less, does not have the influence of middle material pulling force simultaneously to can cause drift cutting edge to present the phenomenon of scraping, and then increase the length of bright area.

Through the implementation of the invention, the first hole 1 is formed by implementing the punching step on the matching surface, and the second hole 2 is formed by implementing the punching step on the first hole 1 in a manner of enlarging the diameter, so that the length of the bright belt of the second hole 2 is increased, and further, the length of the effective matching surface between the riveting hole and the rivet is effectively increased, and the verticality of riveting is ensured. And the hinge is shaped, so that the riveting precision of the hinge and the assembling precision between the hinge and the vehicle body mounting hole can be improved.

As an alternative embodiment, the diameter of the second hole 2 is less than or equal to 8 mm. The first hole 1 is 1mm smaller than the diameter of the second hole 2.

Specifically, the difference between the diameters of the first hole 1 and the second hole 2 is a punching hole allowance value. When the diameter of the second hole is smaller than or equal to 8mm, the punching material retention value can be 1mm, so that the normal cutting amount can be ensured, and the length of the bright belt can be increased. The bright band accounts for 80-90% of the whole hole wall length. When the punching material retention value is less than 1mm, the bad phenomenon that the punch is easy to carry waste materials due to too small cutting amount can occur.

As an alternative embodiment, the diameter of the second hole 2 is greater than 8 mm. The diameter of the first hole 1 is 88-92% of the diameter of the second hole 2.

Specifically, when the diameter of the second hole is larger than 8mm, the diameter of the first hole 1 is 88% -92% of the diameter of the second hole 2, namely the punching material retention value is 8% -12% of the diameter of the second hole. Thereby not only ensuring the normal cutting amount, but also increasing the length of the bright belt. The bright band accounts for 80-90% of the whole hole wall length. When the material remaining value is larger than 12% of the diameter of the second hole, the surface of the bright belt has a fault phenomenon, and the quality and the precision of the bright belt are influenced.

Further, the diameter of the first hole 1 is 90% of the diameter of the second hole 2.

Specifically, the diameter of the first hole 1 is 90% of the diameter of the second hole 2, that is, the punching allowance value is 10% of the diameter of the second hole. Thereby not only ensuring the normal cutting amount, but also increasing the length of the bright belt. The bright band accounts for 90% of the entire hole wall length.

As shown in fig. 1, the diameter of the first hole 1 is a first diameter R1, and 9mm may be used. The diameter of the second hole 2 is a second diameter R2, 10mm may be used.

As shown in fig. 2 to 4, the punched section includes, from top to bottom, a second punch crush a2, a second bright strip B2, a second broken strip C2, and a second burr D2. In fig. 2 and 4, the length L2 of the second bright zone B2 is greater than the length L1 of the first bright zone B1 and the length L4 of the second fractured zone C2 is less than the length L3 of the first fractured zone C1, for hole walls of the same thickness at a distance from top to bottom, respectively. As shown in fig. 3, by implementing the present invention, the length of the effective mating surface between the riveting hole of the hinge 20 and the rivet 10, that is, the length L2 of the second bright band B2, can be increased to ensure the verticality of the riveting.

As an alternative embodiment, the mating surfaces include a riveted mating surface 3 and a vehicle body mount mating surface 4.

Specifically, as shown in fig. 1, the rivet joint face 3 serves as a rivet joint face between the hinge fixed leaf and the hinge movable leaf. The vehicle body mounting matching surface 4 is used as a matching surface for mounting two parts of the hinge fixed leaf and the hinge movable leaf which move relative to the vehicle body respectively. The riveting holes and the mounting holes are formed correspondingly by respectively implementing punching steps on the riveting matching surface 3 and the vehicle body mounting matching surface 4.

Further, in step S2, a punching step is performed on the rivet fitting face 3 to form the first hole 1. The step S3 includes a step of punching the mating surface 4 to form the third hole 5, while forming the second hole 2.

Specifically, as shown in fig. 1 and 2, on the hinge fitting surface 3, the second hole 2 is formed by performing secondary punching on the first hole 1 by reaming, and the hinge hole is used for riveting between the fixed hinge and the movable hinge, so that the length of an effective fitting surface between the riveting hole and the rivet, that is, the length of the second bright band B2, can be increased. A punching step is performed on the vehicle body installation mating surface 4 to form a third hole 5 as an installation hole for installation of the fixed hinge and the movable hinge, respectively, with the vehicle body.

As an alternative embodiment, the shaping step in step S4 includes a first shaping step performed to reduce flatness and parallelism tolerances of the mating surfaces. The mating surfaces include a riveted mating surface 3, and the first shaping step is performed on the riveted mating surface 3.

In particular, each profile includes a hinge mating surface 3 for a fixed hinge and a living hinge. Precision correction is carried out on the hinge matching surface, so that the flatness and parallelism errors of the hinge matching surface are reduced, and the requirement on the precision of the matching size of the hinge matching surface is further improved.

In the punching process of the hinge, the material around the punched hole can generate a slight material conveying process, so that the periphery of the hole site has a tiny concave-convex deformation phenomenon, the deformation is tiny, even though the tiny deformation can influence the large size deviation of the matching part after final assembly, and the assembly precision is improved by shaping the riveting matching surface 3.

Further, the shaping step in step S4 further includes a second shaping step performed to improve the accuracy of mounting the hinge to the vehicle body mounting hole.

Specifically, each shape surface also comprises a fixed hinge and a movable hinge which are respectively corresponding to the vehicle body mounting matching surfaces 4 which are arranged on two parts which move relative to the vehicle body. The precision correction is carried out on the vehicle body installation matching surface 4 and other shape surfaces of the hinge matched with the vehicle body, so that the coordinate matched between the third hole 5, namely the hinge installation hole of the hinge and the vehicle body installation hole is ensured.

In order to ensure the dimensional accuracy requirement of the hinge and the vehicle body mounting matching surface 4, a stamping process of realizing reshaping before punching in the step S1, then realizing punching in the step S2 and then realizing reshaping in the step S3 so as to correct the assembling surface and improve the assembling accuracy is adopted. The reshaping after punching in step S3 is to eliminate the fine deformation around the hole during punching, so as to ensure the dimensional accuracy requirement of the mating surface.

It should be noted that, preferably, the "inward" direction is a direction toward the center of the accommodating space, and the "outward" direction is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "lateral", "vertical", "horizontal", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method of manufacturing a bonnet hinge, comprising the steps of:

s1, sequentially performing trimming, bending and shaping steps on the plate for manufacturing the hinge to form a matching surface;

s2, punching the matching surface to form a first hole (1);

s3, expanding the diameter, and punching the first hole (1) in a scraping mode to form a second hole (2);

s4, shaping each shape surface of the hinge;

the matching surface comprises a riveting matching surface (3) and a vehicle body mounting matching surface (4); performing a punching step on the riveting mating face (3) to form the first hole (1) in the step S2; the step S3 is used for forming a second hole (2) and simultaneously also comprises a step of punching the vehicle body mounting matching surface (4) to form a third hole (5);

the shaping step in the step S4 includes a first shaping step performed to reduce flatness and parallelism tolerances of the mating surfaces, and a second shaping step performed to improve mounting accuracy of the hinge and the vehicle body mounting hole;

the first reshaping step is carried out on the riveting mating face (3).

2. Method according to claim 1, characterized in that the diameter of the second hole (2) is less than or equal to 8mm, the diameter of the first hole (1) being 1mm smaller than the diameter of the second hole (2).

3. Method according to claim 1, characterized in that the diameter of the second hole (2) is greater than 8mm and the diameter of the first hole (1) is 90% of the diameter of the second hole (2).