KR20140102107A - Mold device for molding Mg plate - Google Patents

Abstract

A molding device to form a magnesium plate comprises first and second molds, first and second heaters, and first and second insulating members. The first mold supports a magnesium plate by laying the magnesium plate on the first mold, and comprises a first inner molding unit to form a shape of a bottom surface of a product to be formed; and a first outer molding unit which surrounds a bottom surface and a peripheral surface of the first inner molding unit. A second mold is arranged on an upper side of the first mold to be attached to/detached from the first mold, and shapes the magnesium plate as the product to be formed when being attached to the first mold. The second mold comprises a second inner molding unit to form a shape of an upper surface of the product to be formed; and a second outer molding unit which surrounds an upper surface and a peripheral surface of the second inner molding unit. The first and second heaters are mounted on the first and second inner molding units, respectively, to heat the first and second inner molding units. The first and second insulating members are inserted between the first inner molding unit and the first outer molding unit, and between the second inner molding unit and the second outer molding unit, respectively.

Description

[0001] The present invention relates to a mold apparatus for molding a magnesium plate,

The present invention relates to a mold apparatus for molding a molded article such as a body panel with a magnesium plate material.

In the conventional automobile industry, the frequency of use of steel is high, but as the interest in environment and fuel consumption is increased, new materials are being actively applied to lighten the vehicle. In particular, the use of lightweight non-ferrous metals, which have a lower specific gravity than steel, is increasing. For example, efforts have been made to secure the weight saving of an automobile body by manufacturing a body part to which magnesium (Mg), a non-ferrous metal, is applied.

However, when magnesium is applied, since the crystal structure of magnesium is a dense hexagonal lattice, the moldability at room temperature is very poor. Therefore, in the conventional cold forming process, stamping, press forging, drawing, It is difficult to produce a molded plate product using a process such as bending. In addition, when molding a component having a complicated shape with a magnesium plate, defects may occur in various portions. On the other hand, there has been proposed a warm mold for molding a magnesium sheet in a warm state in which the moldability is improved by heating, but there is a problem in that a warm die of a conventional structure has a large heat loss.

Patent Registration No. 10-1067047 (issued on September 22, 2011)

Disclosure of the Invention The present invention provides a mold apparatus for molding a magnesium plate which can minimize heat loss during warm forming of a magnesium plate.

According to an aspect of the present invention, there is provided a mold apparatus for molding a magnesium plate, comprising: a first inner mold unit for forming a lower surface of a molded product by supporting and supporting a magnesium plate; A first mold having a first outer mold part surrounding a peripheral surface; A second inner mold part for forming a top surface shape of the molded product by molding the magnesium plate material into a molded product when the first mold is molded with the first mold, the second inner mold part being disposed on the upper side of the first mold, A second mold having a second outer mold part surrounding an upper surface and a peripheral surface of the second inner mold part; A first heater and a second heater respectively mounted on the first and second inner mold parts to heat the first and second inner mold parts; And a first heat insulating member and a second heat insulating member inserted between the first inner mold part and the first outer mold part and between the second inner mold part and the second outer mold part, respectively.

The mold apparatus according to the present invention minimizes heat loss during warm molding of the magnesium plate, so that a molded article such as a body panel of a complicated shape can be molded into a high-quality and light-weight molded article without defects. Therefore, when a vehicle body panel is manufactured from a magnesium plate material by the mold apparatus according to the present invention, a lightweight body panel is adopted for the body, which is advantageous for securing the weight of the body.

In addition, since the first and second inner mold parts can be manufactured and replaced in accordance with the changed molded product even if the type of the molded product is changed, the mold apparatus according to the present invention can reduce the manufacturing cost compared with the case of replacing the first and second molds It is effective.

1 is a plan view showing an example of a molded article.
FIG. 2 is a block diagram of a mold apparatus for molding a magnesium plate according to an embodiment of the present invention for molding the molded article of FIG. 1 into a magnesium plate material.
Figure 3 is a perspective view of Figure 2;
Fig. 4 is a perspective view of the first mold in Fig. 3; Fig.
FIG. 5 is an exploded perspective view of FIG. 4;
Fig. 6 is a view showing an example of the first heating rod in Fig. 4; Fig.
Fig. 7 is a perspective view of the second mold in Fig. 3; Fig.
Figure 8 is an exploded perspective view of Figure 7;
9 is a plan view showing another example of a molded article.
10 is a perspective view of a first mold for molding a molded article of FIG. 9;
11 is an exploded perspective view of Fig.
12 is a perspective view of a second mold for molding the molded article of FIG. 9;
13 is an exploded perspective view of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view showing an example of a molded product. The molded product shown in Fig. 1 corresponds to a partition panel 10, which is a type of body panel. The partition panel 10 is a part assembled with the reinforcement panel 20 shown in FIG. 8 to constitute a partition panel assembly. The partition panel assembly is a partitioning part that separates the interior passenger compartment of the vehicle from the trunk room. The partition panel assembly is mounted on the rear portion of the passenger compartment of the passenger compartment and serves to connect the bottom portion and the side portion of the vehicle, and also to prevent the vehicle from torsion and to ensure passenger safety.

FIG. 2 is a configuration diagram of a mold apparatus for molding a magnesium plate according to an embodiment of the present invention for molding the molded article of FIG. 1 into a magnesium plate. Figure 3 is a perspective view of Figure 2; Fig. 4 is a perspective view of the first mold shown in Fig. 3; Fig. 5 is an exploded perspective view of FIG. FIG. 6 is a view showing an example of the first heating rod in FIG. Fig. 7 is a perspective view of the second mold shown in Fig. 3; Fig. 8 is an exploded perspective view of Fig. 7. Fig.

2 to 8, a mold apparatus 100 for molding a magnesium plate includes a first mold 110, a second mold 120, a first heater 130, a second heater 140, A first heat insulating member 150, and a second heat insulating member 160.

The first mold 110 supports and supports the magnesium plate to be formed into the partition panel 10. Magnesium plate is a plate made of magnesium or magnesium alloy material. The magnesium plate may be supplied to the first mold 110 in a preheated state. The first mold 110 may be fixed on a fixed frame (not shown).

The first mold 110 includes a first inner mold part 111 and a first outer mold part 116. The first inner mold part 111 is for forming a bottom shape of the partition panel 10. [ The first molding part 112 having a shape reverse to the bottom shape of the partition panel 10 may be formed on the upper surface of the first inner mold part 111. [ For example, the first inner mold part 111 may be made of a steel material and processed to have the first forming part 112.

The first outer mold part 116 is formed to surround the lower surface and the peripheral surface of the first inner mold part 111. For example, the first outer mold part 116 may be made of cast iron and made of cast iron.

The second metal mold 120 is disposed on the upper side of the first metal mold 110 and is coalesced or separated from the first metal mold 110. The second mold 120 molds the magnesium plate into the partition panel 10 when the first mold 110 and the first mold 110 are molded. For example, the second mold 120 can move up and down with respect to the first mold 110. In this case, the second mold 120 is connected to a movable frame (not shown) of a hydraulic or mechanical press apparatus, and can move up and down together with the movable frame when the movable frame moves up and down.

The second mold 120 includes a second inner mold part 121 and a second outer mold part 126. The second inner mold part 121 is for forming a top surface shape of the partition panel 10. [ A second molding part 122 having a shape opposite to that of the upper surface of the partition panel 10 may be formed on the lower surface of the second inner mold part 121. Therefore, when the first mold 110 and the second mold 120 are molded, the first molding portion 112 of the first inner mold portion 111 and the second molding portion (not shown) of the second inner mold portion 121 122 may be molded into the partition panel 10 while being pressed by the first and second forming portions 112, 122. For example, the second inner mold part 121 may be made of a steel material and processed to have a second forming part 122.

The second outer mold part 126 is formed to surround the upper surface and the peripheral surface of the second inner mold part 121. For example, the second outer mold part 126 can be manufactured in the same material and manner as the first outer mold part 116. A plurality of grooves 126a may be formed on the upper surface of the second outer mold part 126 to reduce the weight of the second outer mold part 126. [ A plurality of grooves such as the groove 126a of the second outer mold part 126 may be formed on the lower surface of the first outer mold part 116 to reduce the weight of the first outer mold part 116. [

The first heater 130 is attached to the first inner mold part 111 to heat the first inner mold part 111. The second heater 140 is attached to the second inner mold part 121 to heat the second inner mold part 121. When the first inner mold part 111 and the second inner mold part 121 heated by the first and second heaters 130 and 140 are assembled with the magnesium plate interposed therebetween, the first inner mold part 111, And the second inner mold part 121, the magnesium plate material can be heated.

The first heat insulating member 150 is inserted between the first inner mold part 111 and the first outer mold part 116. The first heat insulating member 150 may be formed of a number of heat insulating plates corresponding to the number of outer side surfaces of the first inner mold part 111. In the case where a plurality of outer surfaces are provided on the outer periphery of the first inner mold part 111, have. The first outer mold part 116 may be formed with inner surfaces facing the outer surfaces of the first inner mold part 111 with an interval therebetween. The heat insulating plates may be inserted between the outer surfaces of the first inner mold part 111 and the inner surfaces of the first outer mold part 116, respectively. Here, the heat insulating plates may be in contact with the outer surfaces of the first inner mold part 111 and the inner surfaces of the first outer mold part 116 on both sides thereof.

The first heat insulating member 150 insulates the first inner mold part 111 and the first outer mold part 116. That is, when the first inner mold part 111 is heated by the first heater 130, the first heat insulating member 150 moves from the first inner mold part 111 to the first outer mold part 116, And minimizes heat inflow from the first outer mold part 116 to the first inner mold part 111. [ The first heat insulating member 150 may be made of various materials such as ceramics in the range of performing the functions described above.

The second heat insulating member 160 is inserted between the second inner mold part 121 and the second outer mold part 126, respectively. The second heat insulating member 160 may be formed of a number of heat insulating plates corresponding to the number of outer surfaces of the second inner mold part 121. The second outer mold part 126 may have inner sides facing the outer surfaces of the second inner mold part 121 with a gap therebetween. The heat insulating plates may be inserted between the outer surfaces of the second inner mold part 121 and the inner surfaces of the second outer mold part 126, respectively. The second heat insulating member 160 insulates between the second inner mold part 121 and the second outer mold part 126. The second heat insulating member 160 may be made of the same material as the first heat insulating member 150.

According to the mold apparatus 100 having the above-described configuration, it is possible to minimize the heat loss during the warm molding of the magnesium plate, and to mold the molded product such as the partition panel 10 having a complicated shape into a high-quality and light- Even if the type of the molded product is changed, the first and second inner mold parts 111 and 121 can be manufactured and replaced in accordance with the changed molded product. Thus, compared with the replacement of the first and second molds 110 and 120 So that the manufacturing cost can be reduced.

The first outer mold part 116 is formed at a portion of the upper surface corresponding to the outer periphery of the first inner mold part 111 from a portion of the first inner mold part 111 excluding the part corresponding to the withdrawal part of the first heater 130, And a first extension portion 117 formed to extend toward the second side wall portion 126. That is, when the first heater 130 includes a plurality of first heating rods 131 to be described later, the first extending portion 117 is extended from the top edge of the first outer mold portion 116 to the first heating rods 131 131 may extend from the portion except for the lead wire 134 to the second outer mold portion 126.

The second outer mold part 126 extends from a portion of the lower surface of the second inner mold part 121 corresponding to the outer periphery of the second inner mold part 121 except for the part corresponding to the drawing part of the second heater 140, And a second extension portion 127 formed to extend in the direction opposite to the first extension portion 127. The first and second extension portions 117 and 127 are formed so as to be in contact with each other when the first and second molds 110 and 120 are molded. Accordingly, the first and second inner mold parts 111 and 121 are formed in a state where the first and second heaters 130 and 140 are drawn out, The region can be closed by the first and second extensions 117 and 127. [ Therefore, the first and second extension portions 117 and 127 are separated from the first and second inner mold portions 111 and 121 in addition to the first and second heat insulating members 150 and 160, Can be minimized.

The first heater 130 may include a plurality of first heating rods 131. 6, the first heating rod 131 includes a tube 132, a heating wire 133 wound around the tube 132, and a lead wire 134 for supplying current to the heating wire 133 ). ≪ / RTI > The tubular body 132 may be made of a material such as stainless steel. The heating wire 133 is made of nickel chromium or the like and can be accommodated in the tube 132 in a state wound around the magnesium core. The heating wire 133 generates heat in the tube 132 by electric current to transmit heat to the tube 132. The lead wires 134 are connected to an external power source to supply current to the heating wire 133. The lead wires 134 may be made of heat resistant wires.

The first heating rods 131 may be inserted into the first inner mold parts 111 and laid horizontally. The lead wire 134 of each of the first heating rods 131 can be drawn out from the first outer mold portion 116 through the side where the first extending portion 117 is not formed. The first inner mold part 111 may have insertion holes for inserting the first heating rods 131, respectively. If the tolerance between the insertion port of the first inner mold part 111 and the first heating rod 131 increases, the efficiency of heat transfer to the first inner mold part 111 may be reduced. The tolerance of the insertion port and the first heating rod 131 may be approximately 0.15 mm or less. When the partition panel 10 is substantially rectangular, the first heating rods 131 may be arranged at regular intervals. Accordingly, the heat can be uniformly transferred to the magnesium plate material positioned in the first inner mold part 111. [

The second heater 140 may include a plurality of second heating rods 141. The second heating rods 141 may be inserted into the second inner mold portion 121 and laid horizontally. The second heating rod 141 may be configured in the same manner as the first heating rod 131.

The mold apparatus 100 may include first and second temperature sensors 171 and 172 and a temperature control unit 173. [ The first temperature sensor 171 is for measuring the temperature of the first inner mold part 111 heated by the first heater 130. For example, the first temperature sensor 171 may include at least one thermocouple. The thermocouple can be inserted into the first inner mold part 111 and mounted thereon. The thermocouple may be positioned between the first heating rods 131 to measure the temperature of the first inner mold part 111.

The second temperature sensor 172 is for measuring the temperature of the second inner mold part 121 heated by the second heater 140. The second temperature sensor 172, like the first temperature sensor 171, may include at least one thermocouple. The thermocouple can be inserted into the second inner mold part 121 and mounted thereon. The thermocouple can be positioned between the second heating rods 141 to measure the temperature of the second inner mold part 121. [ It goes without saying that the first and second temperature sensors 171 and 172 may be composed of various temperature sensors other than the thermocouple.

The temperatures measured from the first and second temperature sensors 171 and 172 are supplied to the temperature controller 173. The temperature controller 173 receives the measured temperature from the first and second temperature sensors 171 and 172 to form the first and second heaters 130 and 140 so as to form the magnesium plate into the partition panel 10 at the set temperature. ). For example, the temperature controller 173 controls the first and second heaters 130 and 140 to adjust the temperature of the first and second inner mold parts 111 and 121 to a set temperature within the range of 200 ° C. to 250 ° C. .

9 is a plan view showing another example of the molded article. The molded article shown in Fig. 9 corresponds to the reinforcing panel 20 to be assembled to the partition panel. The first and second molds for molding the reinforcing panel may be configured as shown in FIGS. 10 to 13. Here, FIG. 10 is a perspective view of the first mold for molding the molded article of FIG. 11 is an exploded perspective view of FIG. Fig. 12 is a perspective view of a second mold for molding the molded article of Fig. 9; Fig. 13 is an exploded perspective view of Fig.

Referring to FIGS. 10 to 13, the first mold 210 includes a first inner mold part 211 and a first outer mold part 216. A first molding part 212 having a shape reverse to the bottom shape of the reinforcing panel 20 is formed on the upper surface of the first inner mold part 211 to form the bottom shape of the reinforcing panel 20. The first inner mold part 211 may be mounted with the first heater 130 as in the above-described example. Here, the first heating rods 131 of the first heater 130 may be arranged to heat the first inner mold part 211 as much as possible. The first outer mold part 216 is formed to surround the lower surface and the peripheral surface of the first inner mold part 211.

The second mold 220 includes a second inner mold part 221 and a second outer mold part 226. The second inner mold part 221 may be formed with a second forming part 222 having a shape opposite to that of the upper surface of the reinforcing panel 20 to form the upper surface shape of the reinforcing panel 20. The second inner mold part 221 may be mounted with the second heater 140 as described above. The second heating rods 141 of the second heater 140 may be arranged to heat the second inner mold part 221 as much as possible. The second outer mold part 226 is formed to surround the upper surface and the peripheral surface of the second inner mold part 221.

The first heat insulating member 250 is inserted between the first inner mold part 211 and the first outer mold part 216 to perform a heat insulating function and the second heat insulating member 260 is inserted between the second inner mold part 221, And the second outer mold part 226 to perform a heat insulating function. Therefore, heat loss from the first and second inner mold parts 211 and 221 to the outside can be minimized.

The first and second outer mold parts 216 and 226 include first and second extension parts 217 and 227 as described above. Accordingly, the first and second inner mold parts 211 and 221 are formed in a state where the first and second heaters 130 and 140 are drawn out, The area can be closed by the first and second extensions 217 and 227. Therefore, the first and second extension portions 217 and 227 are formed such that heat loss from the first and second inner mold portions 211 and 221 to the outside, together with the first and second heat insulating members 250 and 260, Can be minimized. As described above, the heating temperatures of the first and second inner mold parts 221 and 222 can be measured by the first and second temperature sensors 171 and 172 of the above-described examples. The temperature controller 173 controls the first and second heaters 130 and 140 so as to form the magnesium plate into the reinforcement panel at a predetermined temperature based on the temperatures measured by the first and second temperature sensors 171 and 172 can do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

The first inner mold 111,
116, 216. First outer mold part 117, 217. First extension part
120, 220. The second mold 121, 221. The second inner mold part
126, 226. The second outer mold portion 127, 227. The second extension portion
130 .. First heater 140 .. Second heater
150, 250 .. The first heat insulating member 160, 260 .. The second heat insulating member
171 .. first temperature sensor 172 .. second temperature sensor
173.

Claims (3)

A first mold having a first inner mold portion for molding a lower surface of a molded product and a first outer mold portion surrounding a lower surface of the first inner mold portion and a peripheral surface by supporting a magnesium plate;
A second inner mold part for forming a top surface shape of the molded product by molding the magnesium plate material into a molded product when the first mold is molded with the first mold, the second inner mold part being disposed on the upper side of the first mold, A second mold having a second outer mold part surrounding an upper surface and a peripheral surface of the second inner mold part;
A first heater and a second heater respectively mounted on the first and second inner mold parts to heat the first and second inner mold parts; And
A first heat insulating member and a second heat insulating member inserted between the first inner mold portion and the first outer mold portion and between the second inner mold portion and the second outer mold portion, respectively;
And a mold member for molding the magnesium plate. The method according to claim 1,
The first outer mold portion includes a first extending portion extending from a portion of the upper surface corresponding to the outer portion of the first inner mold portion to a portion of the second outer mold portion except a portion corresponding to the drawing portion of the first heater In addition,
The second outer mold portion may include a second extending portion formed to extend from a portion of the lower surface portion corresponding to the outer portion of the second inner mold portion except the portion corresponding to the drawing portion of the second heater to face the first extending portion ≪ / RTI &
Wherein the first and second extensions are formed so as to be in contact with each other when the first and second molds are formed. The method according to claim 1,
A first temperature sensor and a second temperature sensor for respectively measuring temperatures of the first and second inner mold parts heated by the first and second heaters,
And a temperature controller for controlling the first and second heaters to form the molded article at a predetermined temperature by receiving the measured temperatures from the first and second temperature sensors.

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