KR101836399B1 - Method for manufacturing sub-frame of car - Google Patents

Abstract

The present invention provides a method for manufacturing a sub-frame of a vehicle, which comprises the following steps of: preparing a center panel of a steel material; inserting and installing the center panel in a mold for forming a sub-frame; and manufacturing the sub-frame having a side panel by injecting aluminum molten metal in the mold. In the step of manufacturing the sub-frame, through at least one coupling reinforcement hole individually formed in a left coupling piece and a right coupling piece at both sides of the center panel, the aluminum molten metal is introduced to cast the sub-frame in which the side panel is coupled to both sides of the center panel.

Description

[0001] METHOD FOR MANUFACTURING SUB-FRAME OF CAR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a subframe for a vehicle, and more particularly, to a method of manufacturing a subframe for a vehicle made of different materials.

Recent passenger vehicles are mostly monocoque bodies that are lightweight and highly productive instead of frame bodies. The monocoque body is a structure in which a separate frame is removed, and the power train including the engine is directly mounted on the vehicle body.

Therefore, the monocoque body prevents the vibration of the power train, which is constructed by integrally combining the engine, the transmission, and the differential gear, to be transmitted directly to the vehicle body while the vehicle body itself functions as a frame, A subframe is mounted at the bottom of the vehicle to disperse the impact.

The subframe is mounted to the lower part of the vehicle body such that suspension devices such as suspension struts and knuckles, and suspension devices can be connected. That is, as shown in Fig. 1, the sub-frame is coupled to the vehicle body by the mounting members in the front mounting portion and the rear mounting portion, and a roll load is mounted on the roll mount portion formed on the front side relative to the vehicle body, Thereby sharing load transfer and vibration damping occurring in the powertrain with the engine mount and the transmission mount. Therefore, vibration and noise generated in the engine are transmitted to the driver through a transmission system including a subframe.

 The subframe has a dog bone shape as an overall "H" shape or an "I" shape, and a front mounting portion and a rear mounting portion are formed on the front and rear sides, respectively, have.

In addition, the sub-frame may be provided with a roll mount portion in a predetermined size so that the roll rod can be mounted, and a roll mounting bracket on which the roll rod is seated may be mounted on the inner side of the roll mount portion. Further, the subframe may be provided with a stay at the rear side and a dynamic damper at the front side.

Conventionally, a method of manufacturing such a subframe is a method of combining a casted upper panel or a lower panel by injecting a single material such as iron into a mold or combining a plurality of parts constituting a subframe. However, such a mechanical bonding method has a problem in durability because corrosion can easily occur at a welded portion or a jointed portion. Recently, a solution to such a problem is required.

The present invention is to provide a method of manufacturing a subframe for a vehicle that can improve the corrosion resistance of a subframe for a vehicle and attenuate vibrations of the powertrain by suggesting a new bonding scheme for subframe components made of different materials.

According to an aspect of the present invention, there is provided a method of manufacturing a sub-frame, comprising the steps of: providing a center panel made of iron; inserting the center panel into a mold for forming a sub-frame; and injecting molten aluminum into the mold, Wherein the step of fabricating the subframe comprises the steps of: introducing the molten aluminum through the at least one fastening hole formed in each of the left and right coupling pieces on both sides of the center panel, And the sub-frame to which the side panel is coupled is cast.

According to one embodiment, the side panel may include a left panel having a left binding block secured and covering the left binding piece, and a right panel having a right binding block secured and secured to the right binding piece.

According to one embodiment, the center panel may have a plurality of protrusions on its upper surface.

According to an embodiment, the injection port end of the molten aluminum in the mold may be formed at a position corresponding to each of the left engagement piece and the right engagement piece.

The present invention relates to a method of manufacturing a subframe for a vehicle by combining parts made of different materials according to a new joining method to prevent the occurrence of corrosion caused by welding or mechanical joining cushion using a fastening member And has improved corrosion resistance.

In the vehicle subframe manufactured according to the present invention, the center panel on which the engine is mounted is made of iron and the side panels of aluminum are bonded on both sides of the center panel, so that the center panel first absorbs the vibration transmitted from the engine, By absorbing and damping the vibration of the side panels, the vibration transmitted to the driver can be greatly reduced.

Further, by using the aluminum side panel, the rigidity of the vehicle body can be reinforced.

1 is a perspective view of a conventional subframe.
FIG. 2 is a flowchart illustrating a method of manufacturing a subframe according to an embodiment of the present invention. Referring to FIG.
3 is a plan view of a vehicle subframe according to an embodiment of the present invention.
4 is a plan view of a center panel according to an embodiment of the present invention.
5 is a view illustrating a subframe mold equipped with a center panel according to an embodiment of the present invention.
6 is a view of a side frame cast according to an embodiment of the present invention.
FIG. 7 is an enlarged view of a coupling portion between a center panel and a side panel according to an embodiment of the present invention; FIG.
8 is a longitudinal sectional view of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprises" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 2 is a flowchart illustrating a method of manufacturing a subframe according to an embodiment of the present invention. Referring to FIG.

2, a method of manufacturing a vehicle subframe according to an embodiment of the present invention includes a step (S10) of providing a center panel of steel, a step of inserting the center panel into a mold for molding a subframe (S20) and injecting aluminum molten metal into the mold to manufacture the subframe including the side panel (S30).

Hereinafter, each step will be described in detail with reference to FIGS.

In step S10 of preparing a center panel of steel, the center panel 110 located at a substantially central portion in the subframe 100 can be prepared (see Fig. 3).

The center panel 110 may be positioned approximately at the center of the subframe 100 so that the engine can be seated when the subframe 100 is mounted under the vehicle. The center panel 110 is preferably made mainly of iron so as to support the engine and to primarily absorb the vibration of the engine.

4, the center panel 110 includes a body 113 on which an engine is mounted when the subframe 100 is mounted on a vehicle, And may include a flap 111 and a right flap 112.

The body 113 may have a predetermined space therein and may be cast by molding with a molten iron injected into the mold. However, the lower body may be formed by molding a lower center panel (not shown) And an upper center panel (not shown) having a rim bent downward may be coupled to the upper center panel so that a certain space is formed therein.

As shown in Figs. 3 to 7, the body 113 is preferably embossed in such a manner that a plurality of protrusions are formed in a predetermined pattern over the entire upper surface (the surface facing the engine when mounted on the vehicle). The body 113 having the plurality of protrusions formed therein can improve the absorbing power of the vibration transmitted from the engine.

In this case, the size, number, and shape of the protrusions are not particularly limited. For example, the protrusions may be hexagons protruding to a predetermined size. As shown in FIG. 4, a hexagonal protrusion pattern is repeatedly formed on the center panel 110 .

The projecting height of the projecting portion is not particularly limited, but may preferably be about 1.00 to 1.30 mm. If the height of the protrusion is less than 1.00 mm, the vibration absorbing force of the engine is remarkably decreased. If the height of protrusion is more than 1.30 mm, the mounting force of the sub frame with respect to the vehicle is remarkably decreased.

The left binding piece 111 or the right binding piece 112 is in the form of a plate extending from one side of the body 113 for coupling the center panel 110 to the side panels 120 and 130. The left binding piece 111 Or the right coupling member 112 may be formed on one side of the body 113 and may be two or more.

That is, when two left binding tabs 111 and two right binding tabs 112 are formed on the side of the body 113, respectively, the two left binding tabs 111 or the two right binding tabs 112 are engaged with the body 113 The two left binding pieces 111 or the two right binding pieces 112 may be located at the upper and lower ends of the upper and lower ends of the hexahedron, Lt; / RTI > Accordingly, the vertical cross-section of the two left-hand engagement pieces 111 formed at the upper left and lower ends of the body 113 can have a shape of approximately "⊃", and the two right- The longitudinal section with respect to the right portion of the center panel 110 formed with the projections 112a and 112b may have a shape of approximately " ⊂ "(see Fig. 8).

The width (or extended length) of the left binding piece 111 and the right binding piece 112 is not particularly limited, but may be 1 to 100 mm, taking into account the binding force with the side panels 120 and 130, the weight of the center panel 110, 10 cm.

At least one fastening hole 1111, 1112, 1121, and 1122 may be formed in each of the left coupling part 111 and the right coupling part 112.

The fastening and strengthening holes 1111, 1112, 1121 and 1122 are for joining firmly between the center panel 110 and the left or right panels 120 and 130 by the flow of molten aluminum, The number of the fastening holes 1111, 1112, 1121, and 1122 formed on the left and right coupling members 111 and 112 is not particularly limited. For example, as shown in FIG. 4, Or two fastening strengthening holes of a predetermined size may be formed in the right coupling member 112 in the longitudinal direction.

The shape of the fastening and strengthening holes 1111, 1112, 1121, and 1122 is not particularly limited, but may be circular, polygonal, or elliptical. Holes opened at both sides of the fastening holes 116 may pass through the fastening holes 116 It is preferable that they have the same shape and size so as not to interfere with the flow of the molten aluminum.

Next, the center panel 110 provided as described above is inserted into the mold 200 for forming a sub-frame (S20). That is, as shown in FIG. 5, the center panel 110 can be mounted on the central portion of the mold 200 for molding a sub-frame.

Subsequently, molten aluminum is injected into the mold 200 to manufacture the subframe 100 including the side panels 120 and 130 (S30).

Specifically, aluminum melt injected into a mold cavity flows into a plurality of fastening holes 1111, 1112, 1121, and 112 formed on both sides of the center panel 110. By cooling the aluminum melt, The side panels 120 and 130 are formed and the subframe 100 in which the side panels 120 and 130 are fixed to the center panel 110 is manufactured.

FIG. 6 is a view showing a side frame cast according to an embodiment of the present invention, FIG. 7 is an enlarged view of a coupling portion between a center panel and a side panel according to an embodiment of the present invention, Fig.

The side panels 120 and 130 refer to a left panel 120 coupled to the left side of the center panel 110 and a right panel 130 coupled to the right side of the center panel 110. As shown in FIGS. A left coupling block 123 and a right coupling block 123 covering the left coupling piece 111 and the right coupling piece 112 formed on both sides of the center panel 110 are formed on the inside of the panel 120 and the right panel 130, (133) is formed. That is, the left coupling piece 111 and the right coupling piece 112 of the center panel 110 are fixedly inserted into the left coupling block 123 and the right coupling block 133, respectively, The panels 120 and 130 are tightly coupled together.

According to one embodiment, when the left binding piece 111 and the right binding piece 112 formed on both sides of the center panel 110 are two, each of the two left binding pieces 111 is positioned on the left side of the body 113 And the two right coupling pieces 112 may be formed at the upper right and lower ends of the body 113, respectively. In this case, the left joining block 123 or the right joining block 133 made of aluminum material is subjected to FSW welding (Friction Stir Welding) between the joining blocks 123 and 133 and the joining pieces 111 and 112 on both the upper and lower sides. .

5, the injection end ends H1 and H2 of the molten aluminum in the mold 200 are connected to the left coupling piece 111 (or the left coupling block 123) and the right coupling piece 112 ( Or the right-side engaging block 133). That is, when the side panels 120 and 130 are formed and the side panels 120 and 130 are coupled with the center panel 110, (Or the left binding block 123) and the right binding piece 112 (or the right binding block 133) in consideration of a defect,

Since the side panels 120 and 130 according to the present invention are mainly made of aluminum (silicon, magnesium, titanium or the like can be mixed), the vibration of the engine, which is transmitted through the center panel 110 of steel, The side panels 120 and 130 of aluminum can absorb and attenuate the side panels 120 and 130 of the vehicle body, and the side panels 120 and 130 of the aluminum material can reinforce the rigidity of the vehicle body.

That is, the subframe is usually for supporting the vehicle body and the engine. In the subframe according to the present invention, the steel center panel 110 supports the engine and the aluminum side panels 120 and 130 support the vehicle body do.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

100: Subframe 110: Center panel
111: left binding piece 112: right binding piece
113: Body 1111: First left tightening hole
1112: second left tightening reinforcing hole 1121: first right tightening reinforcing hole
1122: second right side fastening hole 120: left side panel
121: left front mounting portion 122: left rear mounting portion
123: left combination block 130: right panel
131: right front mounting portion 132: right rear mounting portion
133: right coupling block 200: mold

Claims (4)

The center panel having a body having a predetermined size of space therein, and a left and a right coupling part extending from left and right sides of the body, respectively, wherein the left and right coupling parts and right Two coupling pieces are formed on each of upper and lower left and right sides of the body;
Inserting the center panel into a mold for molding a subframe; And
Injecting molten aluminum into the mold to produce the subframe including the side panels;
, ≪ / RTI &
The step of fabricating the sub-
Wherein the molten aluminum is introduced through at least one fastening hole formed in each of the left and right coupling pieces, and the subframe having the side panels coupled to both sides of the center panel is cast.
Wherein the side panel includes a left panel having a left binding block fixedly covering the left binding piece and a right panel having a right binding block fixed to cover the right binding piece,
Wherein the end of the injection port of the molten aluminum in the mold is formed at a position corresponding to each of the left engaging piece and the right engaging piece. delete The method according to claim 1,
The center panel includes:
Wherein a plurality of protrusions are formed on an upper surface of the substrate. delete

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