KR101738900B1

KR101738900B1 - Method of making front-hub and front-hub thereof

Info

Publication number: KR101738900B1
Application number: KR1020160024329A
Authority: KR
Inventors: 성기복; 박대준
Original assignee: (주)한일정공
Priority date: 2016-02-29
Filing date: 2016-02-29
Publication date: 2017-06-08

Abstract

The present invention relates to a method for manufacturing a composite material front hub for automobiles in which a sheet of a prepreg is trimmed and pressed to form a hub body and a front hub in which an insert and a hub bolt are integrally formed is manufactured, Lt; / RTI >

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a composite hub for a vehicle,

In the present invention, a hub body of a front hub is formed by using a sheet of a prepreg impregnated with CFRP (Carbon Fiber Reinforced Plastics), and an insert for mounting an axle shaft and a wheel The present invention relates to a method for manufacturing a composite front hub for an automobile and a front hub using the hub bolt for mounting the hub so that the hub bolt is integrally fixed to the hub body.

Automotive hubs and / or techniques related to manufacturing include,

Korean Patent Publication No. 10-2007-0044090 (published on Apr. 27, 2007), entitled " Power Transmission Device for Clutchless Compressor ", and Korea Patent No. 10-0405459 (registered on November 3, 2003) And a method of manufacturing a light hub unit and a hub unit each having a one-piece bearing ring are disclosed in Korean Patent Laid-Open Publication No. 10-2014-0091485 (published on July 21, 2014).

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Korean Patent Application Publication No. 10-2007-0044090 (published on April 27, 2007) Document 2. Korean Patent Registration No. 10-0405459 (Registered on November 3, 2003) Document 3: Korean Patent Publication No. 10-2014-0091485 (published on July 21, 2014)

In the present invention, two molds for forming a hub body constituting a front hub and for fixing an insert and a hub bolt to a hub body are prepared, and a prepreg sheet impregnated with a caffeine is laminated, The front hub is manufactured by improving the cohesion and durability of the sheet through processes such as cooling, curing and the like, as well as a composite material front for an automobile which is formed integrally with an insert and a hub bolt made of metal on a hub body made of a non- A method of manufacturing a hub and a front hub using the same.

According to an aspect of the present invention, there is provided a method for manufacturing a composite material front hub for an automobile,

An insert shaft for mounting an axle, a disk-shaped hub body disposed along the periphery of the insert middle portion, and a plurality of hubs disposed radially around the insert at an edge of the hub body, In the automotive front hub made of bolts,

A first bottom space part formed at the center of the inner space and receiving a lower end portion of the insert exposed to the lower side of the hub body, and a plurality of first and second bottom space parts radially disposed around the first bottom space part A bottom mold preparing step including a second bottom space part of the bottom mold;

And a first top space part including an inner cavity for forming a hub body of the front hub and a first top space part formed at the center of the bottom thereof to receive an upper end of the insert exposed to the upper side of the hub body, ;

Inserting an insert bottom end portion of the front hub into the first bottom space portion of the bottom mold;

A plurality of bolt cover inserting steps including a cover body inserted upward from a lower side of each second bottom space part of the bottom mold and a cover head connected to the cover body and exposed to a lower side of each second bottom space part;

A plurality of hub bolt mounting steps including a spiral rod fastened in the cover body of each bolt cover and a bolt head having a non-spiral rod connected to the top of the spiral rod;

Preparing sheets impregnated with carbon fiber reinforced plastics (CFRP);

A plurality of circular holes for inserting the bolt heads of the hub bolts and a center hole for inserting the insert bolts, and having a size corresponding to the hub body;

Wherein the circular holes of the sheet are positioned on the non-spiral rods through the bolt heads of the respective hub bolts and the center holes of the sheets are stacked on the upper side of the insert stopping portion by using the sheets coated with the adhesive, To be positioned on the first substrate;

Coupling the bottom and top molds so that sheets laminated to the bottom mold are received in a cavity of the top mold and the insert top portion is received in a first top space portion of the top mold;

Pressing the top mold toward the bottom mold using a press apparatus;

Natural or forced cooling so that the pressed intermediate molded article is cured; And

Separating the bottom and top molds from each other, and removing a front hub as a final molded product;

.

Meanwhile, in the composite front hub for a vehicle according to the present invention,

The hub body, the hub bolt, and the insert are coupled to each other by the above-described manufacturing method using the sheets impregnated with the CFCs.

A method for manufacturing a composite front hub for an automobile according to the present invention,

It is possible to provide a hub that is easy to manufacture and light in weight by molding a base metal of a non-metallic material, which has improved cohesion and durability of sheets, by pressurizing the sheets housed in the two molds, and simultaneously molding the inserts and hub bolts of the metal integrally There is the biggest effect.

1 is a view illustrating preparation of bottom and top molds, insertion of inserts, insertion of bolts, fixing of hub bolts in the method of manufacturing a composite front hub for an automobile according to the present invention,
2 is a view showing a bolt cover, a support, and a plate in a bottom mold,
Figs. 3 and 4 are diagrams showing a cutting-ready sheet stacking process,
5 is a view showing a pressing process using a press apparatus,
FIG. 6 is a front hub according to a method for manufacturing a composite front hub for a vehicle according to the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

It is assumed that the bottom mold side is referred to as the lower or lower side and the top mold side is referred to as the upper side or the upper side with reference to Fig.

First, a front hub 100 to be referred to in the present invention is mounted on the inside of a steering knuckle connected to a steering device of an automobile, and an axle shaft is inserted and inserted through the center, and a plurality of hub bolts A wheel disk is mounted using a wheel disk. When a rotational power transmitted from an engine is transmitted to an hub through an axle shaft coupled to the hub at the time of traveling of the vehicle, the wheel disk is fixedly coupled to the hub bolt of the hub The wheel is rotated.

The composite front hub 100 for an automobile includes an insert 101 for mounting an axle shaft, a disk-shaped hub body 102 disposed around a middle portion of the insert 101, And a plurality of hub bolts 103 radially disposed at the edges of the body 102 with the insert 101 as a center.

As shown in FIGS. 1 to 6, a method for manufacturing a composite front hub for an automobile according to the present invention includes:

A sheet cutting step, a sheet cutting step, a sheet stacking step, a top and bottom mold interlocking step, a top mold pressing step, a bottom mold pressing step, a top mold preparing step, an insert insert step, a bolt cover inserting step, An intermediate molded article cooling step and a final molded article removal step.

Looking at each step,

The bottom mold preparation step

As shown in Figs. 1 and 2,

Preparing a bottom mold 10 for stacking the sheets 40 for molding the hub body 102 of the front hub 100,

The bottom mold 10 includes a first bottom space part 11 formed at an inner center thereof to receive a lower end portion of the insert 101 exposed at a lower side of the hub body 102, And a plurality of second bottom space parts 12 formed radially and vertically through the first bottom space part 11.

The first bottom space part 11 has a spatial structure corresponding to the shape of the lower end of the insert 101 and each second bottom space part 12 has a shape corresponding to that of each bolt cover 30 to be described later And has a circular hole structure.

As shown in FIG. 2, a plurality of supports 13 are mounted on a lower surface of the bottom mold 10 to support a cover head 32 of each bolt cover 30, which will be described later.

Each of the supports 13 has an annular structure that is mounted on a lower surface of the bottom mold 10 by bolts or the like while covering the cover head 32 of each bolt cover 30.

2, a non-circular portion 33 having a non-circular cross-sectional structure is formed at an end portion of the cover head 32 of each of the bolt covers 30, The plate 14 is further provided with a hole to be fitted in the non-circular portion 33 formed in the cover head 32 of the bottom mold 10. By mounting the plate 14 on the bottom mold 10, The rotation of each bolt cover 30 is restricted.

Top mold preparation stage

As shown in Figure 1,

Preparing a top mold (20) for forming sheets (40) stacked on the bottom mold (10) and forming the hub body (102)

The top mold 20 includes an inner cavity 21 for forming the hub body 102 of the front hub 100 and a lower cavity 20 formed at the center of the bottom of the cavity 21 and formed on the upper side of the hub body 102 And a first top space portion 22 in which an upper end portion of the exposed insert 101 is accommodated.

The cavity 21 is a space for accommodating the sheets 40 stacked on the bottom mold 10 and the first top space 22 is a space for accommodating the upper end of the insert 101 .

The hub bolts 103 fastened to the cover body 31 of the bolt cover 30 to be described later are inserted into the bottoms of the cavities 21 of the top mold 20, A plurality of recesses 23 on which the bolt head 103c of the bolt head 103 is seated is formed.

The ends of the bolt heads 103c of the respective hub bolts 103 are seated and supported on the respective recesses 23 when the bottom and top molds 10 and 20 are coupled to each other.

The insert insert step

As shown in Figures 1 and 3,

And inserting the lower end of the insert 101 of the front hub 100 into the first bottom space portion 11 of the bottom mold 10.

The insert 101 of the front hub 100 is inserted into the first bottom space portion 11 of the bottom mold 10 and stably supported.

The bolt cover insertion step

As shown in Figs. 1 and 2,

Installing a bolt cover (30) on the bottom mold (10) to support the hub bolts (103) so that the hub bolts (103) can be fixed to the front hub (100)

Each of the bolt covers 30 includes a cover body 31 inserted upward from a lower side of each second bottom space 12 of the bottom mold 10 and a cover body 31 connected to the cover body 31, And a cover head (32) exposed to the lower side of the two bottom space parts (12), and the same amount as that of each second bottom space part (12) is provided.

The cover body (31) of each bolt cover (30) is formed with a screw thread in the upper opening.

The hub bolt mounting step

As shown in Figs. 1 and 2,

As a step for fixing the hub bolts 103 to the front hub 100,

Each of the hub bolts 103 includes a spiral rod 103a fastened in the cover body 31 of each bolt cover 30 and a non spiral rod 103b connected to the upper end of the spiral rod 103a. And a bolt head 103c having the same number as that of each bolt cover 30 is provided.

Here, the spiral rod 103a has a cylindrical structure in which a thread is formed on the outer peripheral surface,

The non-spiral rod 103b has a cylindrical structure integrally connected to the spiral rod 103a. A plurality of concave-convex portions are formed along the circumference of the outer circumference, and the concave-convex portion has a vertically-depressed sectional shape. This is because the sheet 40 laminated on the bottom mold 10 is pressed into the concave and convex portions when compression molded by pressing so that the hub bolts 103 To be stably and firmly supported and fixed.

The sheet preparation step

As shown in Figure 3,

Preparing sheets 40 impregnated with carbon fiber reinforced plastics (CFRP)

The CFRP is a high-strength, high-elasticity, lightweight structural material made of carbon fiber reinforcement. Its specific strength is 6 times that of steel, 2 times that of GFRP, 3 times that of steel, 3 times that of GFRP 4 times. In addition to static strength, it has excellent fatigue characteristics and excellent abrasion resistance and abrasion resistance.

The sheet 40 is a prepreg impregnated with the caffeine.

The sheet cutting step

As shown in Figure 3,

In the step of cutting the sheet (40) into a predetermined shape,

A plurality of circular holes 41 for inserting the bolt head 103c of each hub bolt 103 and a central hole 42 for inserting the insert 101 and having a circular size corresponding to the hub body 102, A plurality of the sheets 40 are cut.

The sheet stacking step

As shown in Figures 3 and 4,

By stacking the sheets 40 on the upper side of the bottom mold 10,

The circular holes 41 of the sheet 40 are stacked on the bolt head 103c of the respective hub bolts 103. The circular holes 41 of the sheet 40 are stacked on the bolt head 103c of the hub bolts 103, So that the center hole 42 of the sheet 40 is positioned at the intermediate portion of the insert 101. [0051] As shown in FIG.

The hub springs 103b of the respective hub bolts 103 are exposed to the upper side of the bottom mold 10 while the hub springs 103 are fastened to the bolt covers 30, The circular hole 41 of the sheet 40 is inserted into the non-spiral rod 103b.

At this time, the sheet 40 is stacked on the bottom mold 10 to a predetermined height.

The bottom and top mold interlocking steps

As shown in Figure 5,

The sheets 40 stacked on the bottom mold 10 are accommodated in the cavity 21 of the top mold 20 and the upper end of the insert 101 is inserted into the first top space portion 22 of the top mold 20. [ (10, 20) so that the bottom and top molds (10, 20)

The top mold 20 is placed on the bottom mold 10 with the first bottom space portion 11 of the bottom mold 10 facing upward with the cavity 21 facing downward. At this time, it is preferable that the contact surfaces of the bar and the top molds 10 and 20 are provided with guide members for positioning and coupling guidance when they are coupled to each other.

The top mold pressing step

As shown in Figure 5,

As a step for pressing and forming the sheets 40 laminated on the bottom mold 10,

The top mold 20 is pressed toward the bottom mold 10 by using a separate press apparatus to increase the cohesion force of the sheets 40 laminated on the bottom mold 10. [

At this time, in the pressing step, the heating wires built in the bottom and top molds 10 and 20 receive power from the outside and heat the sheets 40 housed in the two molds 10 and 20, It is preferable to heat the sheets 40 by using the high-temperature heat supplied from the heat source supply device of the apparatus. Therefore, the pressure is maintained at a high temperature of 130 to 140 degrees for 90 to 120 minutes.

The intermediate molded article cooling step

Natural or forced cooling so that the pressed intermediate molded article is cured,

The intermediate molded article is naturally cooled until it is maintained at a temperature of about 60 degrees or less for a certain period of time until it is hardened, or forced cooling is performed by using a blower or the like.

The final molded article removal step

Separating the bottom and top molds 10 and 20 from each other and removing the front hub 100 as a final molded product,

After separating the top and bottom molds 10 and 20 from each other, the front hub 100, which is a final molded product, is removed, and the formed front hub 100 is subjected to post processing such as surface treatment.

The composite front hub 100 for a vehicle according to the present invention,

As shown in [A] and [B] in Fig. 6,

A plurality of hubs 102 are arranged radially along the periphery of the hub body 102 and a center of the insert 101 is arranged along the periphery of the insert 101, The hub body 102 has a structure in which the bolts 103 are arranged and the insert body 101 and the hub bolts 103 are fixedly mounted on the hub body 102, ). &Lt; / RTI >

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And such variations and modifications are to be construed as being within the scope of protection of the present invention.

100: Front hub
101: Insert
102: Hub body
103: Hub bolt
103a: Spiral load
103b: Non-spiral load
103c: Bolt head
10: Bottom mold
11: first bottom space part
12: second bottom space part
13: Support
14: Plate
20: Top mold
21: Cavity
22: first tower space part
23: recess
30: Bolt cover
31: Cover body
32: Cover Head
33: Noncircular
40: sheet
41: Circular hole
42: center hole

Claims

An insert 101 for mounting an axle shaft, a disk-shaped hub body 102 disposed around a middle portion of the insert 101, and an insert (not shown) at an edge of the hub body 102. [ A method for manufacturing a composite front hub (100) for an automobile, the hub hub (100) comprising a plurality of hub bolts (103) radially disposed around the hub hub
A first bottom space part 11 which is formed at the center of the inside and receives a lower end portion of the insert 101 exposed to the lower side of the hub body 102, And a plurality of second bottom space portions (12) formed radially through the circumference of the bottom mold (10) so as to be radially disposed;
An inner cavity 21 for forming the hub body 102 of the front hub 100 and an upper end portion of the insert 101 exposed at the upper side of the hub body 102, A first top space part 22 in which the first top space part 22 is accommodated;
Inserting an insert 101 for inserting the lower end of the insert 101 of the front hub 100 into the first bottom space 11 of the bottom mold 10;
A cover body 31 inserted upward from a lower side of each second bottom space part 12 of the bottom mold 10 and a cover head 32 connected to the lower part of the second bottom space part 12, Inserting a plurality of bolt covers (30);
And a bolt head 103c having a spiral rod 103a fastened in the cover body 31 of each bolt cover 30 and a non spiral rod 103b connected to the upper end thereof, Mounting the bolts 103;
Preparing sheets 40 impregnated with carbon fiber reinforced plastics (CFRP);
A plurality of circular holes 41 for inserting a bolt head 103c of each hub bolt 103 and a center hole 42 for inserting the insert 101 are formed so as to have a size corresponding to the hub body 102 Cutting the sheets (40);
The circular holes 41 of the sheet 40 are stacked on the bolt head 103c of the respective hub bolts 103. The circular holes 41 of the sheet 40 are stacked on the bolt head 103c of the hub bolts 103, Laminating such that the center hole (42) of the sheet (40) is located at the intermediate portion of the insert (101) and is positioned at the non-spiral rod (103b).
The sheets 40 stacked on the bottom mold 10 are accommodated in the cavity 21 of the top mold 20 and the upper end of the insert 101 is inserted into the first top space portion 22 of the top mold 20. [ Bonding the bottom and top molds (10, 20) to each other;
Pressing the top mold (20) toward the bottom mold (10) using a press apparatus;
Natural or forced cooling so that the pressed intermediate molded article is cured; And
Separating the bottom and top molds 10 and 20 from each other, and removing the front hub 100 as a final molded product;
Wherein the method comprises the steps of:

The method according to claim 1,
The bottom of the cavity 21 of the top mold 20 is provided with bolts 32a of respective hub bolts 103 fastened to the cover bodies 31 of the respective bolt covers 30 at the time of mutual engagement with the bottom mold 10. [ Wherein a plurality of recesses (23) on which the head (103c) is seated are formed.

The method according to claim 1,
Wherein a plurality of supports (13) for supporting the cover heads (32) of the respective bolt covers (30) disposed therein are mounted on a lower surface of the bottom mold (10) Hub manufacturing method.

A composite front hub for a vehicle according to any one of claims 1 to 3.