KR20230051365A - Mold for forming aluminum vehicle body part and forming method using the same - Google Patents

Abstract

The present invention relates to a mold for forming an aluminum vehicle body part and a forming method using the same. A die is arranged at the upper side of a punch to ascend or descend to be coupled to or separated from the punch. When an aluminum plate material, supplied between the die and the punch, is coupled to the punch, the same is formed into a formed product having a product portion and a non-product portion to be removed. A blank holder is installed to be upwardly and elastically deflected while facing the holding surface of the die on the outside of the punch. Therefore, when the punch and the die are coupled, the aluminum plate material placed on the upper surface may be restricted along with the holding surface of the die. Piercing devices are installed at one side of the die-side non-product forming surface and the punch-side non-product forming surface to punch holes on the aluminum plate material in a state in which the aluminum plate material is restricted between the holding surface of the die and the blank holder according to the descending movement of the die. Therefore, deep-drawing formability may be improved.

Description

Mold for forming aluminum vehicle body parts and forming method using the same {Mold for forming aluminum vehicle body part and forming method using the same}

The present invention relates to techniques for manufacturing aluminum body parts.

In the conventional automobile industry, steel was frequently used, but as interest in the environment and fuel efficiency increased, new materials for weight reduction of vehicles were actively applied. For example, efforts have been made to secure weight reduction of automobile bodies by manufacturing body parts using aluminum, which is a non-ferrous metal.

In general, room temperature formability of an aluminum material is inferior to room temperature formability of a steel material. Proper material flow into the mold is the key when forming deep drawing presses for car body parts using aluminum plates, which are difficult to form. When forming aluminum body parts, it is difficult to control wrinkles, cracks, springback, etc. that occur on the inside of the product's shape surface because the material inflow and restraint are more difficult than steel materials.

An object of the present invention is to provide a mold for forming aluminum body parts and a molding method using the same, which can improve the deep drawing formability of aluminum body parts.

A mold for forming aluminum car body parts according to the present invention for achieving the above object includes a punch, a die, a blank holder, and piercing devices. The punch has a product shaping surface on the punch side for forming the bottom surface of the product part and a non-product shaping surface on the punch side for shaping the bottom surface of the non-product part to be removed. The die is disposed on the upper side of the punch and molds or separates from the punch as it moves down or rises, and the aluminum plate supplied between the punch is molded into a molded product having a product part and a non-product part to be removed when molded with the punch. , a die-side product molding surface for forming the upper surface of the product portion, a die-side non-product forming surface for forming the upper surface of the non-product portion to be removed, and a holding surface corresponding to the outer upper surface of the aluminum plate.

The blank holder is installed on the outside of the punch to be elastically biased upward while facing the holding surface of the die, and restrains the aluminum sheet placed on the upper surface together with the holding surface of the die when forming the punch and die. The piercing devices are installed on either the die-side non-product molding surface or the punch-side non-product molding surface, and make holes in the aluminum plate while the aluminum plate is constrained between the die holding surface and the blank holder according to the lowering motion of the die. pierce

As a further aspect, the blank holder may have a bead protruding from the top surface to restrain the aluminum sheet between the die holding surface and the bead.

A forming method using a mold for forming aluminum body parts according to the present invention comprises the steps of supplying an aluminum sheet between a punch and a die in a state in which the die is mold-separated from a punch by an upward operation; drilling holes in the aluminum sheet by piercing devices in a state in which the die is lowered and the aluminum sheet is constrained between the holding surface of the die and the blank holder; and forming the aluminum plate into a molded article by continuously lowering the die to form a mold with the punch.

In an additional aspect, in the process of restraining the aluminum sheet between the holding surface of the die and the blank holder, the aluminum sheet may be constrained between the holding surface of the die and the blank holder by the bead protruding from the upper surface of the blank holder.

According to the present invention, it is possible to achieve process cost reduction due to the improvement of deep drawing formability of aluminum body parts and the elimination of the piercing process during the blanking process.

1 is a configuration diagram of a mold for forming aluminum vehicle body parts according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the mold shown in Figure 1;
3 is a plan view of a molded product.
4 is a view for explaining a molding method using a mold for molding aluminum vehicle body parts according to an embodiment of the present invention.

The present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clarity.

1 is a configuration diagram of a mold for forming aluminum vehicle body parts according to an embodiment of the present invention. Figure 2 is an exploded perspective view of the mold shown in Figure 1; 3 is a plan view of the molded product.

1 to 3, a mold 100 for forming aluminum vehicle body parts according to an embodiment of the present invention includes a punch 110, a die 120, a blank holder 130, and a piercing device 140. ) are included.

The punch 110 receives the aluminum plate 1 between the die 120 and the die 120 . The aluminum plate material 1 may correspond to a plate material made of an aluminum alloy containing aluminum as a main component. The punch 110 has a punch-side product forming surface 111a forming the shape of the lower surface of the product portion 10a and a punch-side non-product forming surface 111b forming the shape of the lower surface of the non-product portion 10b to be removed. .

The product part 10a is a part corresponding to a vehicle body part in the molded product 10 formed by the punch 110 and the die 120. The non-product part 10b is a part of the molded product 10 that is cut and removed from the product part 10a by a trimming device or the like. Accordingly, the molded article 10 can be made into a vehicle body part by removing the non-product part 10b from the product part 10a.

The die 120 is disposed on the upper side of the punch 110 and molds or separates from the punch 110 as it lowers or rises. The die 120 is connected to a movable frame (not shown) of a hydraulic or mechanical press device via a die frame, so that when the movable frame moves up and down, it can move up and down together with the movable frame. The press device may be driven and controlled by a controller that controls the mold 100 as a whole.

The die 120 molds the aluminum plate 1 supplied between the punch 110 into a molded product 10 having a product portion 10a and a non-product portion 10b to be removed when molded with the punch 110. . The die 120 has a die-side product forming surface 121a forming the top shape of the product portion 10a, a die-side non-product forming surface 121b forming the top shape of the non-product portion 10b to be removed, and aluminum A holding surface 122 corresponding to the outer upper surface of the plate member 1 is provided.

That is, when the punch 110 and the die 120 are molded, the product part 10a of the molded product 10 is molded together with the punch-side product forming surface 111a by deep drawing press processing. do. The die-side non-product molding surface 121b makes the non-product part 10b of the molded product 10 together with the punch-side non-product molding surface 111b when the punch 110 and the die 120 are molded.

The holding surface 122 presses the outer upper surface of the aluminum plate 1 by the lowering operation of the die 120 in a state where the outer lower surface of the aluminum plate 1 is placed on the upper surface of the blank holder 130, thereby forming a blank holder Together with (130), the outer portion of the aluminum plate (1) is constrained.

The blank holder 130 is installed on the outside of the punch 110 by being elastically biased upward while facing the holding surface 122 of the die 120 . The blank holder 130 may be supported by being provided with an elastic force upward by an elastic means 131 such as a gas spring. The blank holder 130 restrains the aluminum plate 1 placed on the upper surface together with the holding surface 122 of the die 120 when the punch 110 and the die 120 are molded.

The blank holder 130 may act as follows. When the die 120 is mold-separated from the punch 110 and is waiting, the blank holder 130 is supported in a state of being lifted higher than the punch 110 by the elastic means 131. In this state, the aluminum plate 1 is placed on the upper surface of the blank holder 130 . Thereafter, the die 120 descends and is molded with the punch 110 to mold the aluminum plate 1 into the molded product 10 . At this time, since the die 120 descends while holding the aluminum plate 1 together with the blank holder 130 by the holding surface 122, the aluminum plate 1 can be molded in a restrained state.

The blank holder 130 may have a bead 132 that protrudes from the upper surface and restrains the aluminum plate 1 between the holding surface 122 of the die 120 . The bead 132 enables control of the inflow amount of the material flowing into the inside between the die 120 and the punch 110 when the aluminum sheet 1 is formed. The bead 132 controls wrinkles, cracks, springback, etc. that occur on the inside of the product shape surface together with the holes 1a drilled in the aluminum plate 1 by the piercing device 140 during molding of the aluminum plate 1 allow you to do

The beads 132 may be formed to protrude continuously or discontinuously with a predetermined width to correspond to the lower surface of the outer surface of the aluminum plate 1 . The holding surface 122 of the die 120 has a bead groove 122a for introducing the aluminum plate 1 pressed by the bead 132, and the aluminum plate ( 1) can be constrained.

The piercing devices 140 are installed on either one of the die-side non-product molding surface 121b and the punch-side non-product molding surface 111b. The piercing device 140 drills a hole in the aluminum plate 1 while the aluminum plate 1 is restrained between the holding surface 122 of the die 120 and the blank holder 130 according to the lowering operation of the die 120. (1a) pierces them.

The holes 1a drilled in the aluminum plate 1 by the piercing devices 140 enable the peripheral shape to be deformed in the direction of the surface where the material inflow is insufficient during molding of the aluminum plate 1, thereby generating It allows you to control wrinkles, cracks, springback, etc. Therefore, the required molding quality can be met.

After the forming of the aluminum plate 1, the periphery of the holes 1a corresponds to the non-product portion 10b and is cut along the trim line between the product portion 10a and the non-product portion 10b, thereby removing the molded product ( Only the product portion 10a of 10) may be finally left.

For example, the piercing devices 140 may be installed on the die-side non-product molding surface 121b. The piercing device 140 may be configured so that the piercing tool 141 reciprocates by the driver 142 . The piercing tool 141 moves to the aluminum plate 1 and is formed in a form that can easily drill a hole 1a in the aluminum plate 1. Actuator 142 may be formed of a linear actuator such as a hydraulic cylinder.

The piercing device 140 allows the piercing tool 141 to be taken in and out vertically by the actuator 142 through the opening of the die-side non-product molding surface 121b in a state where the actuator 142 is embedded in the die 120. can

The piercing device 140 may function as follows. When the die 120 is mold-separated from the punch 110 and is on standby, the piercing device 140 inserts the piercing tool 141 into the opening of the die-side non-product forming surface 121b by the driver 142. wait as it is

When the holding surface 122 of the die 120 restrains the aluminum plate 1 together with the blank holder 130 according to the lowering operation of the die 120, the piercing device 140 drives the piercing tool 141 as a driver ( 142), it is drawn out from the opening of the non-product molding surface 121b on the die side, and a hole 1a is pierced in the aluminum plate material 1. Thereafter, the piercing device 140 returns the piercing tool 141 to the opening of the die-side non-product forming surface 121b as it is raised by the driver 142 .

Piercing holes 146 respectively corresponding to the piercing tools 141 may be formed on the punch-side non-product molding surface 111b. The piercing hole 146 breaks the aluminum plate 1 by inserting the lower part of the piercing tool 141 together with the aluminum plate 1 that is pressed during the lowering operation of the piercing tool 141. It is possible to smoothly drill the hole (1a) in (1). In addition, the piercing hole 146 may introduce and discharge fragments separated from the aluminum plate 1 when the aluminum plate 1 is pierced.

As another example, the piercing devices 140 may be installed on the punch-side non-product molding surface 111b, and piercing holes 146 may be formed on the die-side non-product molding surface 121b. The piercing devices 140 may be configured to drill a hole 1a having a set size as needed.

According to the mold 100 for forming aluminum body parts described above, in a state where the aluminum plate 1 is restrained between the holding surface 122 of the die 120 and the blank holder 130, the hole ( After drilling 1a), deep drawing molding is completed. Therefore, according to the present embodiment, in the blanking process of cutting the aluminum plate for product molding, the trim process of removing unnecessary shapes after molding, rather than the comparative example of drilling a hole in the place to be removed and then inserting it into the mold, through process reduction It is possible to reduce cost and improve moldability.

4 is a view for explaining a molding method using a mold for molding aluminum vehicle body parts according to an embodiment of the present invention.

First, as shown in (a) of FIG. 4, the aluminum plate 1 is supplied between the punch 110 and the die 120 in a state in which the mold is separated from the punch 110 by lifting the die 120. . At this time, the piercing device 140 waits in a state in which the piercing tool 141 is drawn into the die 120 by the driver 142 . The aluminum plate 1 is supported by being placed on the upper surface of the blank holder 130 .

Then, as shown in (b) of FIG. 4, the aluminum plate 1 is restrained between the holding surface 122 of the die 120 and the blank holder 130 by lowering the die 120. Holes 1a are drilled in the aluminum plate 1 by the piercing devices 140 in.

At this time, the piercing device 140 is pulled out from the die 120 as the piercing tool 141 is lowered by the driver 142 to drill a hole 1a in the aluminum plate 1, and then the piercing tool 141 As it is raised by the actuator 142, it returns into the die 120.

In the process of restraining the aluminum plate 1 between the holding surface 122 of the die 120 and the blank holder 130, the die 120 is held by the bead 132 protruding from the upper surface of the blank holder 130. The aluminum plate 1 can be restrained between the holding surface 122 .

Then, as shown in (c) of FIG. 4 , the aluminum plate 1 is molded into a molded article 10 by continuously lowering the die 120 to form a mold with the punch 110 . At this time, the holes 1a drilled in the aluminum plate 1 make it possible to deform the surrounding shape in the direction of the surface where the material inflow is insufficient during molding of the aluminum plate 1, so wrinkles, cracks, and springbacks occurring inside the product shape surface Allows you to control your back. As a result, the required molding quality can be met.

The present invention has been described with reference to an embodiment shown in the accompanying drawings, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. You will be able to. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

1..Aluminum plate 10..Formed product
110.. punch 120.. die
130.. Blank holder 131.. Elastic means
132.. bead 140.. piercing device
141.. piercing tool 142.. actuator

Claims (4)

a punch having a product forming surface on the punch side for forming the lower surface of a product part and a non-product forming surface on the punch side for forming the lower surface of the non-product part to be removed;
It is disposed on the upper side of the punch and is molded or mold-separated from the punch as it is lowered or raised, and the aluminum plate supplied between the punch is molded into a molded product having a product part and a non-product part to be removed when molded with the punch. A die having a die-side product forming surface for forming the upper surface of the product portion, a die-side non-product forming surface for forming the upper surface of the non-product portion to be removed, and a holding surface corresponding to the outer upper surface of the aluminum plate;
a blank holder installed on the outside of the punch to be elastically deflected upward while facing the holding surface of the die, and restraining the aluminum sheet placed on the upper surface together with the holding surface of the die when the punch and the die are molded; and
It is installed on either of the die-side non-product molding surface and the punch-side non-product molding surface, and holes are made in the aluminum plate material in a state in which the aluminum plate material is restrained between the holding surface of the die and the blank holder according to the lowering operation of the die. piercing piercing devices;
A mold for forming aluminum body parts comprising a. According to claim 1,
The mold for forming aluminum body parts according to claim 1 , wherein the blank holder has a bead protruding from an upper surface and restraining the aluminum sheet material between the blank holder and the holding surface of the die. A molding method using the mold for molding aluminum car body parts according to claim 1,
Supplying an aluminum sheet between the punch and the die in a mold-separated state from the punch by lifting the die;
drilling holes in the aluminum sheet by piercing devices in a state in which the die is lowered and the aluminum sheet is constrained between the holding surface of the die and the blank holder; and
Forming an aluminum plate into a molded article by continuously lowering the die to form a mold with the punch;
A molding method using a mold for molding aluminum body parts comprising a. According to claim 3,
In the process of restraining the aluminum plate between the holding surface of the die and the blank holder, the aluminum plate material is restrained between the holding surface of the die by a bead protruding from the upper surface of the blank holder. Forming method using .

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