KR101450386B1 - Hot stamping apprarus and hot stamping mtehod using the same - Google Patents

Abstract

More particularly, the present invention relates to a hot stamping method for forming a cut line in a press forming process in a hot state, in which a scrap is not separated from an article to be finished A hot stamping molding apparatus and a hot stamping molding method in which a separate scrap processing apparatus is not required.
The present invention provides a base plate comprising: a base plate; A lower mold fixed to the base plate; An upper mold corresponding to the lower mold; A blank holder on which the blank is seated; A press slide for moving up and down the upper mold; An elastic supporting portion provided between the press slide and the upper mold; A shearing cutter fixed to the press slide to form a cut line in the blank exposed to the outside of the upper mold and the lower mold so that the cut line is started inside the blank so that the scrap is not separated; And a buffer pin for supporting the blank holder so as to move up and down.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot stamping molding apparatus and a hot stamping molding apparatus using the hot stamping molding apparatus,

The present invention relates to a hot stamping molding method for producing a molded article by press molding a sheet material in a hot state and then rapidly cooling the sheet material. More particularly, the present invention relates to a hot stamping method for forming a cutting line in a hot- To a hot stamping molding apparatus and a hot stamping molding method in which a separate scrap processing apparatus is not required.

The hot stamping molding method is a processing method for manufacturing a high strength molded body by heating a blank having hardenability and then shaping the shape through press molding in a heated state and cooling the mold in a closed state.

When the press molding is performed, a portion to be supported by the mold is necessary, so that the blank is inevitably included in the blank to be removed later. In addition, when precise dimensional accuracy is required, a trimming process is required in a cured state after molding.

However, since the rapidly cooled formed body after hot forming has a high strength, it is often impossible to cut using a press, so that trimming can be performed mainly by using a laser or a water jet. Trimming using laser or waterjet is a long process time and high processing cost, which causes the production cost of the product to rise.

Further, when the cutting operation is performed in the press forming process, it is possible to reduce the laser trimming operation, but a separate processing device for discharging the scrap to the outside of the press apparatus is required.

The present invention provides a hot stamping molding apparatus in which a scrap line is formed in a press molding process, but scrap is not separated from the finished product so that a separate scrap processing apparatus is not required, and a hot stamping molding method using the same.

An object of the present invention is to provide a hot stamping molding method capable of reducing a post-processing process which is disadvantageous in terms of processing cost and processing time.

Another object of the present invention is to provide a hot stamping molding apparatus capable of performing trimming by using a shearing mold before the molding is cured in a state where the press die is closed.

Another object of the present invention is to prevent scrap from being completely separated from the finished product in the trimming operation using the shearing mold and to separate the scrap in the subsequent laser trimming process so that hot stamping, And a molding method.

Another object of the present invention is to improve the service life of the shearing mold and to improve the quality of the welded part by keeping the part where the cutting line is formed or the part where the finished product is welded with other products at a certain temperature.

The present invention provides a base plate comprising: a base plate; A lower mold fixed to the base plate; An upper mold corresponding to the lower mold; A blank holder on which the blank is seated; A press slide for moving up and down the upper mold; An elastic supporting portion provided between the press slide and the upper mold; A shearing cutter fixed to the press slide to form a cut line in the blank exposed to the outside of the upper mold and the lower mold so that the cut line is started inside the blank so that the scrap is not separated; And a buffer pin for supporting the blank holder so as to move up and down.

And a heater unit provided in the upper mold or the lower mold to adjust a local temperature of the blank.

The heater portion may be provided at a portion where the cutting line is formed or may be provided at a portion where the finished product is welded to another portion. At this time, it is more preferable that the heater portion is maintained at a temperature of 400 to 700 DEG C at a portion where the cutting line is formed or a portion where the finished product is welded to the other portion.

In the meantime, the shearing cutter portion may descend in a state where the upper mold and the lower mold are closed to form a cutting line, and the elastic supporting portion may include a hydraulic spring or a mechanical spring.

In addition, the lower mold and the upper mold have cooling holes for cooling the formed material in a region where the heater is not disposed.

Preferably, the blank holder has a gauge for guiding or sensing the seating of the blank material, and the buffering pin preferably provides an elastic force so that the blank holder remains elevated relative to the base plate.

At this time, the buffer pin may include any one of a link, a pneumatic cylinder and a hydraulic cylinder so that the blank holder can move up and down with respect to the base plate.

The present invention relates to a method of forming a blank material by hot press working and then forming a cut line by using a shearing cutter at the boundary between the unnecessary portion of the formed material and the finished product before the material is cooled or the material is cooled Wherein the cutting line is started inside the blank so that unnecessary parts are not separated.

In this case, it is preferable that the cutting line starts inside the unnecessary portion, and the unnecessary portion is separated from the finished product through laser trimming after being separated from the press.

The hot stamping forming apparatus and the hot stamping forming method using the same according to the present invention do not require a scrap processing apparatus according to the present invention, because cutting lines are formed in a press die to reduce the use period of the laser equipment, Brings the effect.

Further, the trim operation using the press mold has a shorter processing time than the laser processing, which shortens the cycle time required for processing. Therefore, the production amount per unit time is increased.

In addition, according to the present invention, the part where the cutting line is formed or the part where the finished product is welded with another product maintains a constant temperature, thereby improving the life of the shearing mold and improving the quality of the welded part.

1 is a configuration diagram showing a hot stamping molding apparatus according to an embodiment of the present invention;
Fig. 2 is a configuration diagram showing a molding standby state of the hot stamping forming apparatus according to the embodiment of the present invention. Fig.
FIG. 3 and FIG. 4 are views showing the state of the upper mold lowering state of the hot stamping molding apparatus according to the embodiment of the present invention,
FIG. 5 is a schematic view illustrating a closed state of an upper mold and a lower mold of a hot stamping molding apparatus according to an embodiment of the present invention;
6 and 7 are views showing a cutting process of a front cutter portion of a hot stamping forming apparatus according to an embodiment of the present invention.
8 is a conceptual view showing a shape of a work according to the progress of a hot stamping molding method according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a hot stamping molding apparatus and a hot stamping molding method using the same, which do not require a scrap processing apparatus according to the present invention, will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a configuration diagram showing a hot stamping molding apparatus according to an embodiment of the present invention.

The hot stamping forming apparatus 100 according to the present invention includes a base plate 110, a lower mold 120 fixed to the base plate 110, an upper mold 130 corresponding to the lower mold 120, A press slide 140 for moving up and down the upper mold 130, an elastic supporter 150 provided between the press slide 140 and the upper mold 130, A blank holder 170 on which a blank is seated, a blank holder 170, a blank holder 170 on which the blank is placed, a front end cutter 160 for cutting the blank by exposing the blank, And a heater unit 190 provided in the upper mold 130 or the lower mold 120 to adjust the local temperature of the blank.

The hot stamping forming apparatus 100 according to the present invention is configured such that a blank material heated at a forming temperature is supplied to perform hot forming and a trimming operation in a predetermined shape, .

The upper mold 130 and the lower mold 120 have cores and cavities corresponding to each other. The upper mold 130 and the lower mold 120 are provided with cooling holes 122 and 132 for cooling. The cooling holes 122 and 132 are connected to a cooling device for supplying the coolant.

The cooling holes 122 and 132 are formed in portions where the heater portion 190 is not provided.

The heater portion 190 is provided at a portion where a cutting line is formed or a portion where the finished product is to be welded to another component.

The heater unit 190 adjusts the temperature of the workpiece to a locally constant temperature.

The heater unit 190 allows the temperature of the material to be maintained in the range of 400 to 700 占 폚.

If this temperature range is maintained, the material is not hardened, so that breakage of the shear cutter portion 160 can be prevented and abrasion can be reduced.

Also, the portions maintained in this temperature range will have good weld properties when locally softened and welded to other components.

The upper mold 130 according to the present invention is connected to the press slide 140 through the elastic support 150. The resilient support portion 150 may be constructed of a hydraulic or mechanical spring. The elastic supporting portion 150 serves to engage the upper mold 130 with the lower mold 120 before the shearing cutter 160 cuts the blank.

The shearing cutter unit 160 has a blade around the upper mold 130 to form a cut line at the boundary between the unnecessary portion of the blank exposed to the outside of the upper mold 130 and the finished product. The shearing cutter portion 160 is fixed to the press slide 140 and is elevated and lowered together with the press slide 140.

It is preferred that the cutting line be started inside the blank. That is, by preventing the unnecessary part from being completely separated from the product, the scrap is not separated. The scrap is removed through a subsequent laser trimming process.

Since the scrap is separated from the finished product, a separate scrap processing device for transferring and discharging the generated scrap is required. Therefore, the present invention prevents the unnecessary part from being completely separated in the hot stamping molding machine.

The shearing cutter unit 160 is positioned above the upper mold 130 in a state where the upper mold 130 is separated from the lower mold 120. When the presser slide 140 is completely lowered, 160 are positioned below the upper mold 130. [ The reference that the shearing cutter unit 160 is positioned above or below the upper mold 130 means that the lower end of the shearing cutter unit 160 is positioned relative to the lower end of the upper mold 130.

The blank holder 170 serves to fix the blank material 10 in place.

The blank holder 170 is connected to the base plate 110 by a buffer pin 180. The buffer pin 180 allows the blank holder 170 to move up and down with respect to the base plate 110. The buffer pin 180 may be configured to provide an elastic force to maintain the blank holder 170 in a raised state with respect to the base plate 110 or may be configured to move the blank holder 170 up and down with respect to the base plate 110 . When the buffering pin 180 is mechanically constructed, it may be configured to include a link, a pneumatic cylinder, a hydraulic cylinder, and the like.

2 is a configuration diagram showing a waiting state of the hot stamping forming apparatus according to the embodiment of the present invention.

In the forming standby state, the press slide 140 is raised (top dead center), so that the upper mold 130 and the lower mold 120 are spaced apart from each other, and the blank holder 170 is also raised.

In this state, when the blank material 10 is loaded in the blank holder 170, the blank material 10 is positioned between the upper mold 130 and the lower mold 120.

The blank holder 170 may be provided with a gauge 172 for guiding or sensing the seating of the blank material 10.

After the blank material 10 is loaded into the blank holder 170 in the forming standby state, it is confirmed that the blank material 10 is seated in the correct position, and then the press slider 140 starts to descend.

FIG. 3 and FIG. 4 are diagrams showing the state of the upper mold lowering state of the hot stamping molding apparatus according to the embodiment of the present invention.

After the blank material 10 is loaded, as the press slide 140 is lowered, the upper mold 120 is lowered together. The upper mold 120 is connected to the press slide 140 by an elastic supporting part 150 and the elastic supporting part 150 provides an elastic force in a direction to separate the upper mold 120 from the press slide 140. The upper mold 120 is lowered in the same manner as the press slide 140 until the upper mold 120 contacts the blank material 10 as shown in FIG.

As shown in FIG. 4, when the upper mold 120 presses the blank material 10 to start molding, the elastic supporting portion 150 is subjected to contractile force. However, the reaction force of the elastic supporting portion 150 is set to be larger than the reaction force generated when the blank material 10 is machined. Therefore, until the upper mold 120 and the lower mold 130 are completely closed, the upper mold 120 is lowered along with the lowering of the press slide 140.

FIG. 5 is a view showing a state in which the upper mold and the lower mold of the hot stamping molding apparatus according to the embodiment of the present invention are closed.

The closed state of the upper mold 130 and the lower mold 120 means that the upper mold 130 and the lower mold 120 are in close contact with each other between the blank material 10, .

When the upper mold 130 and the lower mold 120 are closed, the shape forming is completed and the molded material is cooled. Cooling of the material is achieved by cooling the mold itself. Cooling holes 122 and 132 are formed in the upper mold 130 and the lower mold 120 to cool the upper mold 130 and the lower mold 120 by supplying coolant to the cooling holes 122 and 132, .

At this time, the heater unit 190 maintains a constant temperature so that the welded portion and the cut line forming portion are not cured.

The lower mold 120 is fixed to the base plate 110 when the upper mold 130 is placed between the blank materials 10 and the lower mold 120 is closely contacted with the lower mold 120, The upper mold 130 can not be lowered further even if the press slide 140 is lowered. Accordingly, since the press slide 140 is lowered, the upper mold 130 can not be lowered, so that the elastic supporting part 150 is contracted.

The press slide 140 is lowered with respect to the upper mold 130 and the front end cutter 160 is fixed to the press slide 140. Therefore, the front end cutter 160 Is lowered with respect to the upper mold 130.

6 and 7 are sectional views illustrating a cutting process of the front end cutter of the hot stamping forming apparatus according to the embodiment of the present invention.

FIG. 6 shows a state before cutting, and FIG. 7 shows a state after cutting.

As shown in the figure, unnecessary portions of the blank material 10 are exposed to the outside of the upper mold 130 and the lower mold 120, and the front cutter portion 180 penetrates these portions to form a cutting line.

The shear cutter portion 180 descends with respect to the upper mold 130, and the shearing edge at the lower end forms the unnecessary portion of the blank material and the boundary line of the finished product.

6 shows a state in which the shearing cutter unit 180 is positioned above the blank material 10 and FIG. 7 shows a state in which the shearing cutter unit 180 has completed the lowering and is positioned below the blank material 10 will be.

The shear cutter portion 180 descends, passes through the blank material 10, and forms a cut line at the boundary between the unnecessary portion and the finished product.

The shearing cutter unit 180 interferes with the blank holder 170 during the cutting process because the blank holder 170 is connected to the base plate 110 by the buffering pin 180 so that the shearing cutter unit 180 The blank holder 170 is also lowered.

It is preferable that the lowering of the front end cutter 180 is continuously performed during the cooling process of the blank material 10. [

When the cutting of the front end cutter 180 is completed and the cooling of the work is completed, the press slide 140 is lifted to take out the product. When the press slide 140 is lifted, the operation of the buffer pin 180 restores the blank holder 170 to the standby position. Then, the upper mold 130 is restored to the standby state by the operation of the elastic supporter 150.

8 is a conceptual view showing the shape of a work according to the progress of the hot stamping molding method according to the embodiment of the present invention.

The present invention relates to a method of forming a cut line by forming a blank material through a hot press working and then using a shearing cutter at a boundary line between the unnecessary portion of the formed material and the finished product before cooling the material or cooling the material So that the cutting line is started inside the blank so that the unnecessary part is not separated.

The cutting line starts inside the unnecessary portion, and the unnecessary portion is separated from the finished product through laser trimming after being separated into a press.

As shown in the figure, the uppermost drawing shows a state in which the blank material is completed using the upper mold and the lower mold. After loading the heated material and closing the upper mold and the lower mold, the blank material is processed by the upper mold and the lower mold.

However, unnecessary portions exist around the blank material, so additional cutting operation is required.

The second figure above shows a state in which cutting lines are formed on the boundary between the product and the unnecessary portion 12 on both sides of the blank material by the shearing cutter portion. The starting point 15 of the cutting line is located inside the unnecessary portion.

The lower drawing shows the state where the remaining boundary of the product and the unnecessary portion is cut off in the subsequent process using laser trimming. This process is performed after the product is taken out from the hot stamping molding apparatus, and the scrap is also separated from the finished product in this process. Therefore, since the scrap 14 is separated in the laser trimming process without being separated in the hot stamping molding apparatus, a separate scrap processing apparatus is not required in the hot stamping molding apparatus.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: Hot stamping molding device
110: base plate
120: Lower mold
130: upper mold
140: Press slide
150: elastic support
160: Shearing cutter part
170: Blank holder
180: buffer pin
190: heater part

Claims (15)

A base plate;
A lower mold fixed to the base plate;
An upper mold corresponding to the lower mold;
A blank holder on which the blank is seated;
A press slide for moving up and down the upper mold;
An elastic supporting portion provided between the press slide and the upper mold;
A shearing cutter fixed to the press slide to form a cut line in the blank exposed to the outside of the upper mold and the lower mold so that the cut line is started inside the blank so that the scrap is not separated;
A buffer pin supporting the blank holder so as to move up and down;
A heater unit provided in the upper mold or the lower mold to adjust a local temperature of the blank;
Wherein the lower mold and the upper mold are provided in a region where the heater is not disposed to cool the molded workpiece,
The upper mold and the shearing cutter part are lowered only by the lowering operation of the press slide, and after forming the material of the upper mold, the shearing cutter forms a cutting line in the blank exposed to the outside of the lower mold,
Wherein the heater portion is provided at a portion where the cutting line is formed and a portion where the finished product is welded to another portion to maintain the temperature at 400 to 700 ° C so that the blank of the portion having the heater portion is not cured by cooling Hot stamping molding device.
delete delete delete delete The method according to claim 1,
The shear cutter portion
Wherein the upper die and the lower die are lowered in a closed state to form a cutting line.
The method according to claim 1,
The elastic support portion
Characterized in that it comprises a hydraulic spring or a mechanical spring.
delete The method according to claim 1,
The blank holder
And a gauge for guiding or sensing the seating of the blank material.
The method according to claim 1,
The buffer pin
Wherein the blank holder provides an elastic force to keep the blank holder in a raised state with respect to the base plate.
The method according to claim 1,
The buffer pin
Wherein the blank holder includes any one of a link, a pneumatic cylinder and a hydraulic cylinder so that the blank holder can move up and down with respect to the base plate.
delete delete delete delete

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