KR20160109489A

KR20160109489A - Warm press mold device, and forming method using the same

Info

Publication number: KR20160109489A
Application number: KR1020150033970A
Authority: KR
Inventors: 김대근; 서종덕; 도상현
Original assignee: 주식회사 신영
Priority date: 2015-03-11
Filing date: 2015-03-11
Publication date: 2016-09-21

Abstract

A hot press mold apparatus, and a molding method using the same. The warm press mold apparatus includes a first mold unit, a second mold unit, a first heater, and a second heater. The first mold unit has a first molding part formed on an upper surface thereof and a first inner mold having at least one detachable recess formed by being recessed in the first molding part, A block punch for secondary molding that is replaceable with the block punch for primary molding, and a first outer mold surrounding the lower surface and the peripheral surface of the first inner mold. The second mold unit is disposed on the upper side of the first mold unit and is formed into a molded product by molding or molding the first mold unit and the mold together with the first mold unit. A second inner mold having a punch guide groove recessed in the second molding section to guide the first molding block punch or the second molding block punch mounted on the molding part and the attaching / detaching groove, And a second outer mold surrounding the peripheral surface. The first and second heaters are respectively mounted on the first and second inner molds to heat the first and second inner molds.

Description

[0001] Warm press mold apparatus, and molding method using the same [0002]

TECHNICAL FIELD The present invention relates to a hot press mold apparatus for molding a molded article such as a body panel.

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 such as a body panel using magnesium (Mg) as a non-ferrous metal.

However, when molding a body part with a magnesium plate, 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, It is difficult to mold the body part using processes such as drawing, bending, and the like. In addition, when molding a body part having a complicated shape, defects may be generated in various parts. In order to solve such a problem, a warm press die device has been proposed in which the plate material is heated to form the plate material in a warm state in which the moldability is enhanced.

On the other hand, when the shape of the body part is complicated or the deformation is severe, the body part is molded by the two press molding steps. However, according to the related art, since two molds are used for molding a vehicle component in the two press molding processes, there is a problem that the cost of manufacturing the mold becomes excessive. Further, the warm press die of the conventional structure has a problem of a large heat loss.

The object of the present invention is to provide a warm press die apparatus capable of reducing mold production cost and minimizing heat loss during warm forming.

According to an aspect of the present invention, a warm press mold apparatus includes a first mold unit, a second mold unit, a first heater, and a second heater. The first mold unit has a first molding part formed on an upper surface thereof and a first inner mold having at least one detachable recess formed by being recessed in the first molding part, A block punch for secondary molding that is replaceable with the block punch for primary molding, and a first outer mold surrounding the lower surface and the peripheral surface of the first inner mold. The second mold unit is disposed on the upper side of the first mold unit and is formed into a molded product by molding or molding the first mold unit and the mold together with the first mold unit. A second inner mold having a punch guide groove recessed in the second molding section to guide the first molding block punch or the second molding block punch mounted on the molding part and the attaching / detaching groove, And a second outer mold surrounding the peripheral surface. The first and second heaters are respectively mounted on the first and second inner molds to heat the first and second inner molds.

In the molding method using the warm press die apparatus according to the present invention, first, the plate material is loaded on the first mold unit in a state where the block punch for primary molding is mounted on the attaching / detaching groove of the first inner mold. Next, the first mold unit and the second mold unit are combined to press the plate material, and the first and second inner molds are heated to a set temperature by the first and second heaters to heat the plate material, . Then, after separating the first mold unit and the second mold unit, the block punch for primary molding is separated from the attaching / detaching groove of the first inner mold in a state in which the primary molded product is discharged. Then, after attaching the block punch for secondary molding to the attaching / detaching groove in the empty state, the primary molded product is loaded on the first mold unit again. Next, the first mold unit and the second mold unit are combined to press the primary molded product, and the temperature of the first and second inner molds is raised to the set temperature by the first and second heaters to heat the primary molded product, And molded into a molded article.

According to the present invention, when a vehicle body panel such as a roof panel is molded by two press molding processes, the body panel is not formed using two molds unlike the conventional method, The body panel can be formed by replacing the block punch with the molding block, thereby reducing the manufacturing cost of the mold. According to the present invention, since the first and second inner molds are surrounded by the first and second outer molds, heat loss can be minimized during warm forming of the magnesium plate. In addition, since the vehicle body panel can be manufactured in a light weight by the present invention and can be applied to the vehicle body, it can be advantageous in weight reduction of the vehicle body.

1 is a perspective view showing an example of a molded article.
FIG. 2 is a configuration diagram of a warm press mold apparatus according to an embodiment of the present invention for molding the molded article of FIG. 1;
Figure 3 is a perspective view of Figure 2;
Fig. 4 is a perspective view of the first and second mold units in Fig. 3;
Fig. 5 is a view for explaining the process of replacing the primary block punch with the secondary block punch in Fig.
6 is a view showing a state in which a plate material is primarily molded by a block punch for primary molding.
7 is a view showing a state in which the primary molded product is secondary-molded by the secondary-molding block punch.
Fig. 8 is an exploded perspective view of the first mold unit in Fig. 4; Fig.
Fig. 9 is an exploded perspective view of the second mold unit in Fig. 4; 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 article shown in Fig. 1 corresponds to a roof panel 10, which is a type of body panel. The roof panel 10 covers the upper portion of the vehicle body to form a roof. The roof panel 10 may have a structure in which a plurality of bending pieces 12 are arranged on both side edges of the panel body 11. Each of the bending pieces 12 has a bent shape from the side edge of the panel body 11. The bent pieces 12 can be used to join the roof panel 10 to the vehicle body.

FIG. 2 is a configuration diagram of a warm press mold apparatus according to an embodiment of the present invention for molding the molded article of FIG. 1; Figure 3 is a perspective view of Figure 2; Fig. 4 is a perspective view of the first and second mold units in Fig. 3; Fig. 5 is a view for explaining the process of replacing the primary block punch with the secondary block punch in Fig. 6 is a view showing a state in which a plate material is primarily molded by a block punch for primary molding. 7 is a view showing a state in which the primary molded product is secondary-molded by the secondary-molding block punch.

2 to 7, the warm press mold apparatus 100 includes a first mold unit 110, a second mold unit 120, a first heater 130, and a second heater 140 .

The first mold unit 110 supports and supports a plate material to be molded by the roof panel 10. The plate may be made of a plate of magnesium or magnesium alloy. The plate material may be supplied to the first mold unit 110 in a preheated state. The first mold unit 110 can be fixed on a fixed frame (not shown).

The first mold unit 110 includes a first inner mold 111, a first molding block punch 112, a second molding block punch 113, and a first outer mold 116. The first inner mold 111 has a first molding portion 111a formed on an upper surface thereof and at least one detaching groove 111b formed by being recessed in the first molding portion 111a. In the case of molding the roof panel 10, the first molded portion 111a has a shape opposite to the bottom shape of the panel body 11.

The attaching / detaching groove 111b allows the primary molding block punch 112 or the secondary molding block punch 113 to be attached to or detached from the first forming portion 111a. The attaching / detaching groove 111b may be variously formed in such a manner that the block punch for primary molding 112 or the block punch for secondary molding 113 can be fitted. When the primary molding block punch 112 is provided in a number corresponding to the number of the bending pieces 12 of the roof panel 10, the attaching / detaching groove 111b is formed in the number of the primary molding block punches 112 Are formed in the first forming portion 111a in a corresponding number. The first inner mold 111 may be made of a steel material.

The primary forming block punch 112 can be detached from the attaching / detaching groove 111b. When molding the first and second inner molds 111 and 121 in the state where the block punches 112 for primary molding are mounted on the detachable grooves 111b when the roof panel 10 is molded, The bending pieces 12 are firstly molded, respectively, as shown in Fig. The secondary forming block punch 113 can be replaced with the primary forming block punch 112. That is, the worker separates the primary forming block punches 112 from the attaching / detaching grooves 111b and then inserts and inserts the secondary forming block punch 113 into the attaching / detaching grooves 111b, The forming block punches 112 can be replaced with the secondary forming block punches 113.

7, when the first and second inner molds 111 and 121 are molded in the state that the block punches 113 for secondary molding are mounted on the attachment / detachment grooves 111b, The bending pieces are each secondarily molded. The secondary forming block punch 113 can be configured to make the angle for bending the bending piece 12 larger than that for the primary forming block punch 112. [ That is, when the bending piece 12 is bent at the target angle 2, the bending piece 12 is bent at the angle? 1, which is smaller than the target angle? 2, by the primary molding block punch 112, , The bending piece 12 can be secondarily bent at the target angle? 2 by the secondary forming block punch 113. [ The bending pieces 12 are illustrated as being bent in two steps. However, the block punches may be configured to bend the bending pieces 12 in three or more steps.

The first outer mold 116 is formed so as to surround the lower surface and the peripheral surface of the first inner mold 111. Therefore, when the first inner mold 111 is heated by the first heater 130, the heat lost from the first inner mold 111 by the first outer mold 116 can be minimized. The first outer mold 116 is made of cast iron and can be manufactured by casting.

The second mold unit 120 is disposed on the upper side of the first mold unit 110 and is coalesced or separated from the first mold unit 110. The second mold unit 120 molds the first mold unit 110 and the mold plate member into a molded product, such as the roof panel 10. The second mold unit 120 can move up and down with respect to the first mold unit 110. In this case, the second mold unit 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 unit 120 includes a second inner mold 121 and a second outer mold 126. The second inner mold 121 has a second forming portion 121a and a punch guide groove 121b. The second forming part 121a is formed on the lower surface of the second inner mold 121 so as to correspond to the first forming part 111a. The second shaping portion 121a has a shape opposite to the top surface shape of the panel body 11. [ Therefore, when the first mold unit 110 and the second mold unit 120 are molded, the first molding part 111a of the first inner mold 111 and the second molding part (not shown) of the second inner mold 121 121a can be formed into the panel body 11 while being pressed by the first and second forming portions 111a, 121a.

The punch guide groove 121b is formed in the second molding part (not shown) so as to guide the primary molding block punch 112 or the secondary molding block punch 113 mounted in the attaching / detaching groove 111b of the first inner mold 111 121a. That is, in a state where the primary forming block punch 112 is mounted to the attaching / detaching groove 111b, the punch guide groove 121b guides the primary forming block punch 112. [ For this purpose, the number of the punch guide grooves 121b is equal to the number of the block punches 112 for primary molding. The punch guide groove 121b is formed in the punch guide groove 121b in the state where the secondary forming block punch 113 is inserted into the attaching / detaching groove 111b in the state where the primary forming block punch 112 is replaced with the secondary forming block punch 113 . The second inner mold 121 may be made of the same material as the first inner mold 111.

The second outer mold 126 is formed to surround the upper surface and the peripheral surface of the second inner mold 121. Therefore, when the second inner mold 121 is heated by the second heater 140, the heat lost from the second inner mold 121 by the second outer mold 126 can be minimized. The second outer mold 126 may be manufactured in the same material and manner as the first outer mold 116.

The first heater 130 is attached to the first inner mold 111 to heat the first inner mold 111. The second heater 140 is mounted on the second inner mold 121 to heat the second inner mold 121. When the first inner mold 111 and the second inner mold 121 heated by the first and second heaters 130 and 140 are assembled with the plate member interposed therebetween, the first inner mold 111 and the second inner mold 121 The heat of the mold 121 can heat the plate material.

According to the mold apparatus 100 having the above-described configuration, when a body panel such as the roof panel 10 is formed by two press molding processes, the body panel is not molded using two molds, It is possible to mold the body panel by replacing the primary block punch 112 for primary molding with the block punch 113 for the secondary molding, thereby reducing the manufacturing cost of the mold.

In addition, since the first and second inner molds 111 and 121 are surrounded by the first and second outer molds 116 and 126, heat loss during warm forming of the magnesium plate can be minimized. In addition, even if the type of the molded product is changed, the first and second inner molds 111 and 121 can be manufactured and replaced in accordance with the changed molded product. Therefore, compared with the replacement of the first and second mold units 110 and 120 So that the manufacturing cost can be reduced.

Meanwhile, as shown in FIG. 8, the first heat insulating member 150 may be inserted between the first inner mold 111 and the first outer mold 116. The first heat insulating member 150 is inserted between the first outer mold 116 and the first inner mold 111 in a state corresponding to the inner and outer surfaces of the first outer mold 116. The first heat insulating member 150 insulates between the first inner mold 111 and the first outer mold 116. That is, when the first inner mold 111 is heated by the first heater 130, the first heat insulating member 150 minimizes heat loss from the first inner mold 111 to the first outer mold 116 And minimizes the heat input from the first outer mold (116) to the first inner mold (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 first heat insulating member 150 may be divided into a plurality of first heat insulating plates 150a. The first heat insulating plates 150a are disposed between the inner surface of the first outer mold 116 and the outer surface of the first inner mold 111 and the inner surface of the first outer mold 116 and the inner surface of the first inner mold 111, 111).

9, the second heat insulating member 160 is inserted between the second inner mold 121 and the second outer mold 126, respectively. The second heat insulating member 160 is inserted between the second outer mold 126 and the second inner mold 121 in a state corresponding to the inner bottom surface and the inner circumferential surface of the second outer mold 126. The second heat insulating member 160 insulates between the second inner mold 121 and the second outer mold 126. The second heat insulating member 160 may be made of the same material as the first heat insulating member 150.

The second heat insulating member 160 may be divided into a plurality of second heat insulating plates 160a in the same manner as the first heat insulating member 150 is. The second heat insulating plates 160a are disposed between the inner surface of the second outer mold 126 and the outer surface of the second inner mold 121 and the inner surface of the second outer mold 126, 121).

In the case where the first and second heaters 130 include heating rods to be described later, the first outer mold 116 has a portion corresponding to a portion where the lead wires of the heating rods are drawn out from the first inner mold 111, And the second outer mold 116 may have a portion corresponding to a portion where the lead wires of the heating rods are drawn out from the second inner mold 121. Although not shown, the first and second outer molds 116 and 126 may be formed in such a manner that the first and second outer molds 116 and 126 are in contact with each other except for the respective cut-out portions in a state where the first and second mold units 110 and 120 are engaged . In this case, heat loss from the first and second inner molds 111 and 121 to the outside can be prevented as much as possible.

The first heater 130 may include a plurality of heating rods. The heating rod may be configured to include a tube body, a heating wire wound inside the tube body, and lead wires for supplying current to the heating wire. The lead wires are connected to an external power source and supply current to the heating wire. The heating wire conducts heat by the electric current supplied in the tube and transfers heat to the tube.

The heating rods may be inserted into the first inner mold 111 and laid horizontally. The lead wires of the respective heating rods can be drawn out through a portion of the first outer mold 116 exposing the first inner mold 111. [ The first inner mold 111 may have insertion openings for inserting the heating rods, respectively. The heating rods 131 may be arranged in various patterns such that the heating rods 131 are arranged in parallel so that heat can be uniformly transferred to the plate materials.

Similarly to the first heater 130, the second heater 140 may include a plurality of heating rods. The heating rods of the second heater 140 may be respectively inserted into the second inner mold 121 and laid horizontally. The first and second heaters 130 and 140 may be controlled by the temperature controller 170. A first temperature sensor for measuring the temperature of the first inner mold 111 heated by the first heater 130 and a second temperature sensor for measuring the temperature of the second inner mold 121 heated by the second heater 140 A second temperature sensor may be provided for measuring the temperature of the liquid. The first temperature sensor may include at least one thermocouple. The thermocouples can be inserted into the first inner molds 111 and 121, respectively. The thermocouple can be positioned between the heating rods of the first heater 130 to measure the temperature of the first inner mold 111.

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

The temperature controller 170 receives the measured temperature from the first and second temperature sensors and controls the first and second heaters 130 and 140 so as to form the sheet material into the roof panel 10 at the set temperature. For example, the temperature controller 170 may control the first and second heaters 130 and 140 to adjust the temperature of the first and second inner molds 111 and 121 to a set temperature within the range of 200 ° C. to 250 ° C. have.

The molding method using the warm press die apparatus 100 will be described with reference to FIGS. 2 to 7. FIG.

First, a plate material is stacked on the first mold unit 110 in a state where the block punch 112 for primary molding is mounted on the attaching / detaching groove 111b of the first inner mold 111. Here, the plate member may be made of a magnesium plate member.

The first mold unit 110 and the second mold unit 120 are then combined to press the plate material and the first and second inner molds 111 and 111 are pressed by the first and second heaters 130 and 140, (121) is heated to a set temperature to heat the plate material to form a primary molded product. The first and second molding portions 111a and 121a of the first and second inner molds 111 and 121 are formed by molding the panel body 11 of the roof panel 10, And the primary molding block punch 112 is primarily guided by the punch guide grooves 121b of the second inner mold 121 to primarily mold the bending pieces 12 of the roof panel 10. [

After the first mold unit 110 and the second mold unit 120 are separated from each other, the block punch for primary molding 112 is pressed against the first inner mold 111 And is detached from the attaching / detaching groove 111b. Then, the secondary molding block punch 113 is mounted on the empty attaching / detaching groove 111b in an empty state, and then the primary molded product is stacked on the first mold unit 110 again.

The first mold unit 110 and the second mold unit 120 are then combined to press the primary molded product and the first and second heaters 130 and 140 press the first and second inner molds 111) 121 are heated to a set temperature, and the primary molded product is heated to form a secondary molded product. At this time, the secondary forming block punch 113 is guided by the punch guide grooves 121b of the second inner mold 121 to secondary-mold the bent piece 12 of the roof panel 10. As a result, the roof panel 10 can be finally formed.

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.

110 .. First mold unit 111 .. First inner mold
112. 1 Block punch for molding 113. 2 Block punch for molding
116. First outer mold 120. Second mold unit
121. Second inner mold 126. Second outer mold
130 .. First heater 140 .. Second heater

Claims

A first inner mold having a first forming portion formed on an upper surface thereof and at least one detachable recess formed by being recessed in the first forming portion, and a second inner mold which is detachably attached to the attaching / A first mold unit including a block punch, a block punch for secondary molding that is replaceable with the block punch for primary molding, and a first outer mold surrounding the bottom surface and the peripheral surface of the first inner mold;
A first mold unit, a second mold unit, and a second mold unit, wherein the first mold unit and the second mold unit are formed as a molded product, A second inner mold having a forming portion and a punch guide groove recessed in the second forming portion to guide the block punch for primary molding or the block punch for secondary molding mounted on the detachable groove, A second mold unit having a second outer mold surrounding an upper surface and a peripheral surface of the inner mold; And
First and second heaters mounted on the first and second inner molds to heat the first and second inner molds;
Wherein the hot press mold apparatus comprises:

The method according to claim 1,
A first heat insulating member inserted between the first outer mold and the first inner mold in a state corresponding to an inner top surface and an inner circumferential surface of the first outer mold;
Further comprising a second heat insulating member inserted between the second outer mold and the second inner mold in a state corresponding to an inner bottom surface and an inner circumferential surface of the second outer mold.

A molding method using the warm press die apparatus according to any one of claims 1 to 3,
Loading a plate material on the first mold unit in a state where the block punch for primary molding is mounted on the attaching / detaching groove of the first inner mold;
The first mold unit and the second mold unit are combined to press the plate material and the first and second inner molds are heated to a set temperature by the first and second heaters to heat the plate material, Molding;
Separating the first mold unit and the second mold unit from each other and then separating the primary molding block punch from the attaching / detaching groove of the first inner mold while discharging the primary molded product;
Mounting the block punch for secondary molding on the detachable groove in an empty state, and then reloading the primary molded product on the first mold unit; And
The first mold unit and the second mold unit are combined to press the primary molded product and the first and second inner molds are heated to a set temperature by the first and second heaters to heat the primary molded product Molding into a secondary molded product;
And a molding method using the warm press die apparatus.