KR20160074247A

KR20160074247A - Mold apparatus of manufacturing hot stamping parts

Info

Publication number: KR20160074247A
Application number: KR1020140183335A
Authority: KR
Inventors: 원광우; 김대근; 서판기; 남재두; 차승훈; 안민수
Original assignee: 주식회사 신영
Priority date: 2014-12-18
Filing date: 2014-12-18
Publication date: 2016-06-28

Abstract

A mold apparatus for manufacturing a hot stamping part according to the present invention includes a lower mold, an upper mold, a press mechanism, and a cooling water supply device. The lower die is provided with a lower die and a lower die disposed on the upper side of the lower frame for receiving and holding a blank of a heated ultra-high strength material. The upper mold is formed by being engaged with or separated from the lower mold at the upper side of the lower mold. The upper mold includes an upper frame, an upper pad pressed by the lower die in a state of being supported by an elastic force under the upper frame to paddle the blank, A molding punch which is pressed by a lower die while being supported by an elastic force on the lower side to form a blank into a set shape component, and a trimming portion of a part formed by lowering toward the lower die in a state of being fixed to the lower side of the upper frame, And a half trimming punch. As the upper frame is lowered, the press mechanism presses the upper pad and the forming punch with the lower die, and brings the half trimming punch down to the half trimming position. The cooling water supply supplies cooling water to the inside of the lower mold and the upper mold.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold apparatus for manufacturing hot stamping parts,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing parts employed in a vehicle or the like using a hot stamping process.

In the automotive industry, materials such as ultra-high strength steel sheets, which have high weight-to-weight ratio, are being applied to meet vehicle light weight and stability. However, the ultra-high strength steel sheet has low moldability and causes excessive spring back, so that it is difficult to manufacture a mold for forming an ultra high strength steel sheet. To solve these difficulties, hot stamping molding technology has been applied to body parts.

However, since the hot stamping component to which the hot stamping technique is applied has a high tensile strength after molding, a high surface pressure is applied to the trimming mold during the press trimming process for the hot stamping component. As a result, there is a problem that abrasion, chipping, plastic deformation, etc. occur in the trimming mold. Due to these defects, the trimming molds must be replaced within 5,000 rpm, not only the productivity is lowered but also the trimming mold manufacturing costs are increased.

Therefore, currently hot stamping parts are finally manufactured by a laser trimming process. However, the laser trimming has a disadvantage that the productivity is greatly reduced, and there is a problem that the import and maintenance of the expensive laser trimming equipment depend entirely on the import.

An object of the present invention is to provide a mold apparatus for manufacturing hot stamping parts which can improve productivity and increase the lifetime of a trimming mold.

According to an aspect of the present invention, there is provided a mold apparatus for manufacturing a hot stamping part, including a lower mold, an upper mold, a press mechanism, and a coolant supply device. The lower die is provided with a lower die and a lower die disposed on the upper side of the lower frame for receiving and holding a blank of a heated ultra-high strength material. The upper mold is formed by being engaged with or separated from the lower mold at the upper side of the lower mold. The upper mold includes an upper frame, an upper pad pressed by the lower die in a state of being supported by an elastic force under the upper frame to paddle the blank, A molding punch which is pressed by a lower die while being supported by an elastic force on the lower side to form a blank into a set shape component, and a trimming portion of a part formed by lowering toward the lower die in a state of being fixed to the lower side of the upper frame, And a half trimming punch. As the upper frame is lowered, the press mechanism presses the upper pad and the forming punch with the lower die, and lowers the half trimming punch to the half trimming position. The cooling water supply supplies cooling water to the inside of the lower mold and the upper mold.

According to the present invention, the part can be half-trimmed at the time of molding by the hot stamping process and supplied to the trimming mold. Therefore, the lifetime of the trimming mold used for fully trimming the trimming portion of the component is increased, so that the mass productivity can be increased and the manufacturing cost of the trimming mold can be lowered. In addition, since trimming parts of the parts can be trimmed by using the trimming mold without using the laser trimming equipment, the productivity of the center pillar, which is widely applied as a hot stamping part, can be improved and the manufacturing cost can be reduced.

1 is a block diagram of a mold apparatus for manufacturing hot stamping parts according to an embodiment of the present invention.
Fig. 2 is a perspective view of the upper mold and the lower mold in Fig. 1; Fig.
Figs. 3 to 6 are views for explaining an operation example of the mold apparatus in Fig.
FIG. 7 is a perspective view illustrating an example in which a half-piercing punch and a half-piercing die are further provided in FIG.
FIG. 8 is a view for explaining an example of the operation of the half-piercing punch and the half-piercing die in FIG.

The present invention will now be described in detail with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and a detailed description of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

1 is a block diagram of a mold apparatus for manufacturing hot stamping parts according to an embodiment of the present invention. Fig. 2 is a perspective view of the upper mold and the lower mold in Fig. 1; Fig.

1 and 2, a mold apparatus for manufacturing hot stamping parts is an apparatus for manufacturing parts using a hot stamping process. The apparatus includes a lower mold 110, an upper mold 120, a press mechanism 130, And a cooling water supplier 140. Here, the part may correspond to a center pillar for a vehicle. The center pillar is a body part that is installed at the left and right center of the vehicle to support the roof and keep the door.

The lower mold 110 receives the heated ultra-high strength material blank. The ultra-strength material may correspond to a super-machined steel sheet. The super high strength steel sheet is cut into a blank of a set size and supplied to the lower mold 110. The blank may be heated to 900 ° C or higher and supplied to the lower mold 110. The lower mold 110 includes a lower frame 111 and a lower die 112. The lower die 112 is disposed on the upper side of the lower frame 111. The lower die 112 may be fixedly supported on the upper surface of the lower frame 111.

The lower die 112 has a padding portion 113 for padding a blank together with the upper pad 122 on an upper surface thereof. On the upper surface of the lower die 112, a forming portion 114 having a shape reverse to the bottom shape of the component is formed. The lower die 112 has a stepped portion 115 on the upper surface thereof. The stepped portion 115 is formed at the outer periphery of the forming portion 114 in a stepped shape lower than the forming portion 114. The stepped portion 115 corresponds to the half trimming punch 124. The stepped portion 115 is formed so that the half trimming punch 124 can be lowered to the half trimming position. The lower die 112 may be made of steel or the like.

The upper mold 120 is fitted or separated from the upper mold 110 with the lower mold 110. The upper mold 120 includes an upper frame 121, an upper pad 122, a forming punch 123, and a half trimming punch 124.

The upper pad 122 is supported by elastic force on the lower side of the upper frame 121. The upper pad 122 is disposed corresponding to the padding 113 of the lower die 112. The upper pad 122 is pressed by the lower die 112 to pad the blank. Thus, the blank can be pressed and regulated between the upper pad 122 and the lower die 112 when molded into a part. Further, the molded part can be pressed and regulated between the upper pad 122 and the lower die 112 when half-trimmed.

The upper pad 122 may be connected to the upper frame 121 by an elastic member such as a gas spring 125a. The gas spring 125a performs the spring function by utilizing the elasticity of the gas filled in the closed space. The gas spring 125a applies an elastic force to the upper pad 122 in a state in which the upper frame 121 is lowered to the forming position.

Therefore, the upper pad 122 can be held by the elastic force of the gas spring 125a to padded the blank. Further, the gas spring 125a exerts an elastic force on the upper pad 122 when the upper frame 121 descends from the forming position to the half trimming position. Therefore, the upper pad 122 can be maintained in a padded state without lowering together with the upper frame 121. The upper pad 122 may be made of steel or the like.

The forming punch 123 is supported by elastic force on the lower side of the upper frame 121. The forming punch 123 is disposed to correspond to the forming portion 114 of the lower die 112. The forming punch 123 is formed with a molded portion having a shape opposite to the shape of the upper surface of the component. The forming punch 123 is pressed by the lower die 112 to form the blank into a component of the set shape. At this time, since the blank is in a heated state, it can be hot formed by the forming punch 123 and the forming part 114 of the lower die 112. When the part to be molded is a center pillar, the forming punch 123 is formed of two pieces, and the upper pads 122 may be disposed between the forming punches 123. [

The forming punch 123 may be connected to the upper frame 121 by an elastic member such as a gas spring 125b as in the case of the upper pad 122. [ The gas spring 125b applies an elastic force to the molding punch 123 in a state in which the upper frame 121 is lowered to the molding position. Therefore, the forming punch 123 can be supported by the elastic force of the gas spring 125b and can be held in a state in which the blank is pressed. Further, the gas spring 125b exerts an elastic force on the molding punch 123 when the upper frame 121 descends from the molding position to the half trimming position. Therefore, the forming punch 123 can be kept pressed with the molded part without falling along with the upper frame 121. The forming punch 123 may be made of steel or the like.

The half trimming punch 124 is fixed to the lower side of the upper frame 121 and moves up and down together with the upper frame 121. The half trimming punch 124 is disposed at the outer periphery of the forming punch 123 so as to correspond to the step portion 115 of the lower die 112. The half trimming punch 124 descends toward the lower die 112 to half-trim the trimmed portion of the molded part. That is, the half trimming punch 124 half-trims the molded part when the upper frame 121 descends from the forming position to the half trimming position. At this time, since the molded part is in a heated state, it can be subjected to hot half trimming by the half trimming punch 124.

If the blank is molded into a component of the set shape, an unnecessary portion may be generated at the edge of the molded component. An unnecessary portion corresponds to a trimming portion to be removed by the trimming process. The half trimming can be defined as the shearing deformation of the trimming part of the part without being completely broken due to the shearing breakage and about half of the trimming part. The half trimming position of the upper frame 121 can be set to a position where the half trimming punch 124 is lowered so as to shear deformation of the trimming part of the part by about half. The half trimming punch 124 may be made of steel or the like.

The upper mold 120 can be guided by the guide unit when the lower mold 120 is engaged with the lower mold 110. [ The guide unit includes a plurality of lower blocks 116, upper blocks 126, wear plates 127, guide grooves 117, guide posts 118, (128).

The lower blocks 116 may be connected to the upper side of the lower frame 111. The lower blocks 116 are disposed on the outer periphery of the lower die 112. The upper blocks 126 may be connected to the lower side of the upper frame 121 so as to face the lower side blocks 116, respectively. The upper blocks 126 are disposed at the outer periphery of the half trimming punch 124.

The wear plates 127 are mounted on the upper blocks 126, respectively. The wear plates 127 may be mounted so as to protrude downward at respective outer portions of the upper blocks 126. The guide grooves 117 are formed in the lower blocks 116 to guide and guide the wear plates 127 when the upper frame 121 is lowered. The guide grooves 117 may have a shape in which the upper portion of the lower blocks 116 is recessed on the outer side surfaces.

When the upper frame 121 descends from the standby position to the forming position, the wear plates 127 are guided in the guide grooves 117 and guided. In this process, the upper pad 122 and the forming punch 123 are guided to the padding portion 113 and the forming portion 114 of the lower die 112, so that the hot forming for the blank can be stabilized.

The guide posts 118 are mounted on the lower blocks 116, respectively. The guide posts 118 may be mounted to protrude from the upper surfaces of the lower blocks 116. The guide holes 128 are formed in the upper blocks 128 to guide and guide the guide posts 118 when the upper frame 121 is lowered. The guide holes 128 may be recessed from the lower surface of the upper blocks 126.

When the upper frame 121 descends from the forming position to the half trimming position, the guide posts 118 are guided in the guide holes 128. In this process, the half trimming punch 124 is guided and guided to the step 115 of the lower die 112, so that the hot half trimming of the trimming part of the part can be stabilized. It is also possible that the wear rates 127 are mounted on the lower blocks 116 and the guide grooves 117 are formed on the upper blocks 126 and that the guide posts 118 are formed on the upper blocks 126 And the guide holes 128 may be formed in the lower blocks 116. [0054]

The pressing mechanism 130 presses the upper pad 122 and the forming punch 123 by the lower die 112 as the upper frame 121 is lowered and presses the half trimming punch 124 to the half trimming position Descend. The press mechanism 130 may be of a hydraulic type or a mechanical type. The press mechanism 130 can be controlled to raise and lower the upper frame 121 by the controller 150. [ The controller 150 controls the press mechanism 130 to lower the upper frame 121 from the standby position to the half trimming position via the forming position,

The cooling water supply unit 140 supplies cooling water to each of the lower mold 110 and the upper mold 120. For example, a cooling water channel may be formed in the lower die 112 of the lower mold 110. A cooling water channel may be formed in the upper pad 122 of the upper mold 120 and the forming punch 123, respectively. The cooling water supply 140 can supply cooling water to the cooling water channel through manifolds 141 and hoses 142. The manifolds 141 are installed on the lower frame 111 and the upper frame 121, respectively. The hoses 142 connect the manifold 141 with the cooling water channel. The cooling water supply 140 may be controlled by the controller 150. The controller 150 can control the cooling water supplier 140 to maintain the cooling water of about 20 占 폚 supplied to the cooling channel.

An example of the operation of the above-described mold apparatus for manufacturing hot stamping parts will be described with reference to FIGS. 3 to 6. FIG.

3, the upper frame 121 is lifted up to the standby position by the press mechanism 130, so that the upper mold 120 is kept separated from the lower mold 110 . At this time, the cooling channels of the lower mold 110 and the upper mold 120 are maintained to be supplied with cooling water of about 20 ° C by the cooling water supplier 140. In this state, the blank 10 heated to 900 ° C or higher is supplied between the lower mold 110 and the upper mold 120, and is placed on the lower mold 110.

4, the upper frame 121 is lowered from the standby position to the forming position by the press mechanism 130, so that the upper mold 120 is engaged with the lower mold 110. As shown in FIG. The upper pad 122 is then pressed against the padding 113 of the lower die 112 via the blank 10 to paddle the blank 10. The forming punch 123 is pressed against the forming portion 114 of the lower die 112 with the blank 10 interposed therebetween to hot-mold the blank 10 into the component 20 of the set shape. At this time, the upper pad 122 and the forming punch 123 can be held in a state of being supported by the elastic force and pressing the blank 10. The half trimming punch 124 descends to the stepped portion 115 of the lower die 112 and is located corresponding to the trimming portion 21 of the molded part 20.

Thereafter, as shown in Fig. 5, the upper frame 121 is lowered from the forming position to the half trimming position by the press mechanism 130. Fig. Then, the upper pad 122 and the forming punch 123 supported by the elastic force are held in a state in which the molded part 20 is pressed without falling along with the upper frame 121. The half trimming punch 124 is subjected to hot half trimming of the trimming portion 21 of the component 20 as it is lowered together with the upper frame 121. Thereafter, the upper frame 121 is held for several seconds to several tens of seconds while being lowered to the half trimming position, and the molded part 20 is rapidly cooled. Thereafter, after the molded part 20 is supplied to the trimming mold, the trimming part 21 of the part can be completely cut off by cold trimming, as shown in Fig.

As described above, the hot stamping component 20 can be supplied to the trimming mold after the trimming portion 21 is half-trimmed at the time of molding by the hot stamping process. Therefore, when the trimming part 21 of the part 20 is completely trimmed by the trimming mold, the surface pressure acting on the trimming mold can be lowered to prevent the occurrence of wear, chipping and plastic deformation. As a result, since the lifetime of the trimming mold is increased, it is possible to increase the mass productivity and lower the manufacturing cost of the trimming mold. In addition, since the trimming portion 21 of the component 20 can be trimmed by using the trimming mold without using the laser trimming equipment, the productivity of the center filler, which is widely applied to the hot stamping component 20, We can expect a reduction.

As shown in Figs. 7 and 8, the mold apparatus for manufacturing hot stamping parts may further include a half piercing punch 129 and a half piercing die 119. Fig. The half-piercing punch 129 is disposed on the upper pad 122. The half piercing die 119 is disposed to correspond to the half piercing punch 129 in the padding portion 113 of the lower die 112. The half-piercing die 119 half-pierces the blank 10 along with the half-piercing punch 129 as the half-piercing punch 129 is lowered by the press mechanism 130. At this time, since the blank 10 is in a heated state, it can be hot-half pierced. Half piercing can be defined as that the piercing portion 22 of the part 20 is sheared to a point where it is not fully pierced and is sheared about halfway.

As such, the part 20 can be fed to the piercing mold after the piercing portion 22 is half-pierced during molding by the hot stamping process. Therefore, when the piercing portion 22 of the part 20 is completely pierced by the piercing metal, the surface pressure acting on the piercing metal can be lowered to prevent the occurrence of wear, chipping and plastic deformation. As a result, the life of the piercing die can be increased. In addition, since the piercing portion 22 of the part 20 can be pierced by using the piercing die without using the laser piercing machine, the productivity of the parts can be improved and the manufacturing cost can be reduced.

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 .. Lower mold 111 .. Lower frame
112 .. Lower die 119 .. Half piercing die
120 an upper mold 121 an upper frame
122 .. upper pad 123 .. forming punch
124 .. Half trimming punch 129 .. Half piercing punch
130 .. Press mechanism 140 .. Cooling water supply

Claims

A lower mold having a lower die disposed on an upper side of the lower frame and receiving a blank of a heated ultra-high strength material;
And an upper pad which is pressed by the lower die and padded with the blank while being supported by an elastic force on the lower side of the upper frame, A molding punch which is pressed by the lower die while being supported by an elastic force on the lower side of the upper frame to form the blank into a component of a predetermined shape, and a molding punch which is lowered toward the lower die in a state fixed on the lower side of the upper frame, An upper mold provided with a half trimming punch for half trimming the trimming portion of the part to be formed;
A pressing mechanism for pressing the upper pad and the forming punch with the lower die as the upper frame is lowered and lowering the half trimming punch to a half trimming position; And
A cooling water supplier for supplying cooling water to each of the lower mold and the upper mold;
And a mold apparatus for manufacturing a hot stamped part.

The method according to claim 1,
A half piercing punch disposed on the upper pad, and
Further comprising a half piercing die disposed on the lower die to half-pierce the blank with the half-piercing punch as the half-piercing punch is lowered by the press mechanism.

The method according to claim 1,
A plurality of lower blocks connected to the upper side of the lower frame,
Upper blocks connected to the lower side of the upper frame to face the lower blocks,
The wear plates mounted on the upper blocks,
Guide grooves formed in the lower blocks to guide and guide the wear plates when the upper frame is lowered,
Guide posts mounted on the lower blocks, respectively, and
Further comprising guide holes formed in the upper blocks for guiding and guiding the guide posts when the upper frame is lowered.