KR102600983B1 - Cap type hot stamping mold assembly - Google Patents

Abstract

The cap-type hot stamping mold assembly according to the present invention includes a first mold unit for forming a predetermined part by joining after a TWB (Tailor Welded Blank) steel plate is placed, and a first mold unit disposed adjacent to the first mold unit. A first insert portion including a second mold unit, the first insert portion being included in the first mold unit, and having a first cooling channel through which coolant flows; a second insert part included in the second mold unit and having a second cooling channel through which the coolant flows; and a cap portion having an internal space for inserting the first insert portion and the second insert portion adjacent to each other, and having a first forming surface and a second forming surface for giving the shape of the part to the TWB steel sheet. Includes; wherein the first molding surface and the second molding surface are formed continuously with each other, and correspond to the first insert portion and the second insert portion, respectively, and the first mold unit and the second mold. The unit may be characterized by sharing the cap portion.

Description

Cap type hot stamping mold assembly {Cap type hot stamping mold assembly}

The present invention relates to a cap-type hot stamping mold assembly, and more specifically, to a cap-type hot stamping mold that achieves the original purpose of hot stamping by securing processability for cooling channels and improving cooling efficiency. It's about assembly.

Hot stamping is a method that has recently emerged with the growth of eco-friendly vehicles, that is, electric vehicles.

Hot stamping is a method of stamping and forming a steel sheet manufactured by the so-called TWB (Tailor Welded Blank) method at high temperature. It refers to a method of press forming the steel sheet while heating it to a high temperature and then cooling it in a mold.

Hot stamping can increase strength while maintaining the existing thickness compared to existing stamping, making it possible to achieve a weight reduction of about 15 to 25% compared to the existing stamping method.

For example, in the case of boron steel, when it goes through conventional stamping, it has a strength of about 550 MPa, but when it goes through a hot stamping process, it can secure a strength of about 1,500 to 1,700 MPa.

As described above, hot stamping essentially includes a cooling process within the mold, and as a result, a plurality of cooling channels through which coolant flows are generally formed within the mold.

Here, the hot stamping mold is implemented by arranging a plurality of mold units adjacent to each other as disclosed in Korean Patent Publication No. 10-2018-0115836, and each mold unit has a cap unit providing a molding surface and a cap unit attached to the cap unit. Includes an inserted core unit.

When the core unit is inserted into the cap unit, a cooling channel is formed, and coolant flows through the cooling channel.

In the conventional hot stamping mold as described above, a groove for forming a cooling channel is formed on the inner surface of the cap unit, and the thickness of the cap unit must be thickened to process the groove for the cooling channel, so the weight and material input surface are There is a problem of inefficiency.

In addition, in order for the cooling channel of a specific mold unit to be connected to the cooling channel of a neighboring mold unit, it had to pass through a base unit formed along the vertical direction of the core unit and supporting the cap unit and core unit due to problems such as sealing. There is also a problem that cooling efficiency decreases due to this.

Therefore, when it is desired to mold a specific part using the hot stamping method, there is an urgent need to develop a new concept mold to prevent deterioration in the quality of the molded product by improving the processability and cooling efficiency of the cooling channel.

The purpose of the present invention is to provide a cap-type hot stamping mold assembly that can maximize cooling efficiency by securing the machinability of the cooling channel essential for hot stamping, while realizing an optimal path to the cooling channel and preventing leakage of coolant. is to provide.

The cap-type hot stamping mold assembly according to the present invention includes a first mold unit for forming a predetermined part by joining after a TWB (Tailor Welded Blank) steel plate is placed, and a first mold unit disposed adjacent to the first mold unit. A first insert portion including a second mold unit, the first insert portion being included in the first mold unit, and having a first cooling channel through which coolant flows; a second insert part included in the second mold unit and having a second cooling channel through which the coolant flows; and a cap portion having an internal space for inserting the first insert portion and the second insert portion adjacent to each other, and having a first forming surface and a second forming surface for giving the shape of the part to the TWB steel sheet. Includes; wherein the first molding surface and the second molding surface are formed continuously with each other, and correspond to the first insert portion and the second insert portion, respectively, and the first mold unit and the second mold. The unit may be characterized by sharing the cap portion.

When the first insert portion and the second insert portion of the cap-type hot stamping mold assembly according to the present invention are inserted into the interior space, the first insert portion is cooled by interaction with the inner surface defining the interior space, respectively. It has an outer surface on which a channel and the second cooling channel are provided, and the first cooling channel and the second cooling channel are characterized in that the channel formed by being recessed into the outer surface is covered by the inner surface. can do.

The first cooling channel of the cap-type hot stamping mold assembly according to the present invention may be characterized in that it directly communicates with the second cooling channel.

The cap-type hot stamping mold assembly according to the present invention is for forming a predetermined part by joining after the TWB (Tailor Welded Blank) steel sheet is placed, and the shape of the first region of the part is given to the TWB steel sheet. a first mold unit having a first molding surface and a first cooling channel through which coolant flows; And a second mold unit having a second molding surface for giving the shape of the second region of the part to the TWB steel sheet and a second cooling channel through which the coolant flows. The cooling channel includes a 1-1 cooling channel and a 1-2 cooling channel, and the second cooling channel includes a 2-1 cooling channel in communication with the 1-1 cooling channel, and the 1-1 cooling channel. 2 having a 2-2 cooling channel in communication with the cooling channel, a boundary portion of the 1-1 cooling channel and the 2-1 cooling channel, and the 1-2 cooling channel and the 2-2 cooling channel. It may further include a sealing unit disposed at a boundary portion of the channel and integrally formed to seal between the first cooling channel and the second cooling channel.

The sealing unit of the cap-type hot stamping mold assembly according to the present invention includes a first hole portion for communication between the 1-1 cooling channel and the 2-1 cooling channel, the 1-2 cooling channel, and the first cooling channel. 2-2 It may be characterized by having a second hole portion for communication of the cooling channel, and a surface portion for forming the first hole portion and the second hole portion.

The cap-type hot stamping mold assembly according to the present invention is for forming a predetermined part by joining after the TWB (Tailor Welded Blank) steel plate is placed, and has a first cooling channel for flowing coolant. A first mold including an insert part, a first cap part having a first internal space for inserting the first insert part, and a first molding surface for giving the TWB steel sheet the shape of the first region of the part. unit; and a second insert part having a second cooling channel through which the coolant flows, a second internal space for inserting the second insert part, and a second insert part for giving the shape of the second area of the part to the TWB steel sheet. A second mold unit including a second cap portion having a second molding surface, wherein the first cap portion and the second cap portion mediate communication between the first cooling channel and the second cooling channel, respectively. It may be characterized by having a first intermediate channel and a second intermediate channel.

The first cooling channel of the cap-type hot stamping mold assembly according to the present invention includes a 1-1 cooling channel and a 1-2 cooling channel, and the second cooling channel includes the 1-1 cooling channel. and a 2-1 cooling channel in communication with the 1-2 cooling channel, and a 2-2 cooling channel in communication with the 1-2 cooling channel, wherein the first intermediate channel and the second intermediate channel are each connected to the 1-1 It is provided with a 1-1 intermediate channel and a 2-1 intermediate channel for mediating communication between the cooling channel and the 2-1 cooling channel, and the 1-2 cooling channel and the 2-2 cooling channel are provided, respectively. Provided with a 1-2 intermediate channel and a 2-2 intermediate channel for mediating communication, a boundary portion of the 1-1 intermediate channel and the 2-1 intermediate channel, and the 1-2 intermediate channel It may further include a sealing unit disposed at a boundary portion of the 2-2 intermediate channel and integrally formed to seal between the first cooling channel and the second cooling channel.

The cap-type hot stamping mold assembly according to the present invention is for forming a predetermined part by joining after a TWB (Tailor Welded Blank) steel plate is placed, and includes an insert portion having a cooling channel through which coolant flows; a cap portion having an internal space for inserting the insert portion and a forming surface for giving the shape of the part to the TWB steel sheet; a base portion for providing an inlet channel for the coolant; and a connection portion disposed between the base portion and the insert portion to provide a communication channel for communication between the inlet channel and the cooling channel.

According to the cap-type hot stamping mold assembly according to the present invention, processability of the cooling channel essential for hot stamping can be improved.

In addition, cooling efficiency can be maximized by implementing an optimal path to the cooling channel and preventing leakage of coolant.

In addition, it improves the manufacturing processability of the mold itself, which has a significant effect in terms of productivity and cost.

1 is a schematic perspective view illustrating a cap-type hot stamping mold assembly according to an embodiment of the present invention.
Figure 2 is a schematic exploded perspective view illustrating a cap-type hot stamping mold assembly according to an embodiment of the present invention.
Figure 3 is a schematic cross-sectional view taken along line AA of Figure 1.
Figure 4 is a schematic perspective view illustrating a cap-type hot stamping mold assembly according to another embodiment of the present invention.
5 and 6 are schematic exploded perspective views illustrating a cap-type hot stamping mold assembly according to another embodiment of the present invention.
Figure 7 is a schematic perspective view illustrating a modified example of a sealing unit provided in a cap-type hot stamping mold assembly according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention may add, change, or delete other components within the scope of the same spirit, or create other degenerative inventions or this invention. Other embodiments that are included within the scope of the invention can be easily proposed, but this will also be said to be included within the scope of the invention of the present application.

In addition, components having the same function within the scope of the same idea shown in the drawings of each embodiment will be described using the same reference numerals.

Figure 1 is a schematic perspective view for explaining a cap-type hot stamping mold assembly according to an embodiment of the present invention, and Figure 2 is a schematic exploded view for explaining a cap-type hot stamping mold assembly according to an embodiment of the present invention. It is a perspective view, and Figure 3 is a schematic cross-sectional view taken along line AA of Figure 1.

Referring to Figures 1 to 3, a cap-type hot stamping mold assembly (100, hereinafter referred to as 'mold assembly') according to an embodiment of the present invention is formed by joining a TWB (Tailor Welded Blank) steel plate after it has been placed. It is a mold for forming a predetermined part, and the part may be one of the fillers for a vehicle door, but is not necessarily limited thereto.

Meanwhile, in the drawing, the lower mold for molding the part is shown as the mold assembly 100 according to an embodiment of the present invention, but the mold assembly 100 according to an embodiment of the present invention corresponds to the lower mold. It may be a concept that includes the upper mold, or both the upper mold and the lower mold.

The mold assembly 100 may have a plurality of mold units arranged adjacent to each other on the base portion 150 so that the parts are molded in a fixed state by welding or the like. For example, the first mold unit 110 , and may include a second mold unit 120 disposed adjacent to the first mold unit 110.

The first mold unit 110 may include a cap portion 140 and a first insert portion 112, and the second mold unit 120 may include the cap portion 140 and the second insert portion 122. It can be included.

The first insert part 112 may have a first cooling channel (CH1) through which the coolant flows, and the second insert part 122 may have a second cooling channel (CH2) through which the coolant flows. It can be provided.

The first cooling channel (CH1) and the second cooling channel (CH2) are cooled within the mold assembly 100 after the TWB steel sheet is press-formed by the mold assembly 100 to stably form the part. This channel may be a type of coolant flow channel provided inside the mold assembly 100 through which coolant flows.

The first insert part 112 and the second insert part 122 may be inserted into the internal space (S) of the cap part 140 while being adjacent to each other, and the cap part 140 may be inserted into the TWB steel plate as the part. It may be provided with a first molding surface (SF1) and a second molding surface (SF2) for giving the shape.

Here, the first molding surface (SF1) and the second molding surface (SF2) may be formed continuously with each other and may correspond to the first insert portion 112 and the second insert portion 122, respectively. there is.

The cap portion 140 allows a plurality of insert portions 112 and 122 to be inserted so that one cap portion 140 can correspond to a plurality of insert portions 112 and 122, and the first insert portion 112 and Insert parts other than the second insert part 122 may be inserted simultaneously.

The cap portion 140 may be made of a steel material, etc., and the first molding surface (SF1) and the second molding surface (SF2) may include a flat and/or curved surface corresponding to the shape of the part. .

The first mold unit 110 and the second mold unit 120 each include the first insert portion 112 and the second insert portion 122, while sharing the cap portion 140.

As described above, the mold assembly 100 according to an embodiment of the present invention is a cap-type mold and is manufactured so that one cap portion 140 corresponds to a plurality of insert portions 112 and 122, so that the cap portion 140 to be manufactured ), the manufacturing process of the cap portion 140 can be simplified due to a reduction in the number.

Additionally, by reducing the number of cap parts 140, the possibility of coolant leaking through the cap parts 140 can be minimized.

Hereinafter, the process of forming the first cooling channel (CH1) and the second cooling channel (CH2) will be described in detail.

When the first insert portion 112 and the second insert portion 122 are inserted into the inner space (S), the first insert portion (112) and the second insert portion (122) interact with the inner surface (IS) defining the inner space (S), respectively. It may have an outer surface (ES) on which the first cooling channel (CH1) and the second cooling channel (CH2) are provided.

Here, the first cooling channel (CH1) and the second cooling channel (CH2) may be formed by being recessed into the outer surface (ES) and the formed channel is covered by the inner surface (IS).

As described above, the channels that are recessed to form the first cooling channel (CH1) and the second cooling channel (CH2) are formed on the outer surfaces of the first insert portion 112 and the second insert portion 122. It can be formed in (ES), and as a result, there is an advantage in that a sufficient amount of processing can be secured compared to that formed on the inner surface of the conventional cap portion 140.

In general, the cap part is manufactured with a relatively thin thickness compared to the insert part, and because of this, there are inevitably limitations in the amount of processing when machining grooves of a certain depth.

Therefore, it is difficult to form a groove of the optimal depth for the flow of coolant in the cap portion, and as a result, there is a problem in terms of cooling efficiency. Therefore, in the present invention, the above problem is solved by forming a groove on the outer surface of the insert portion. will be.

Meanwhile, the first cooling channel (CH1) of the first mold unit 110 may be directly connected to the second cooling channel (CH2) of the second mold unit 120.

In a conventional cap-type mold, the cooling channel of one mold unit is formed in the vertical direction of the insert portion as disclosed in Korean Patent Publication No. 10-2018-0115836, and then flows through the base portion on which the insert portion is mounted to the next mold unit. There was a problem in terms of efficiency as it was formed to communicate through a vertical cooling channel.

However, in the present invention, it is possible to form an optimal path by connecting directly to each other without forming a vertical channel to pass through the base portion, thereby improving processability and cooling efficiency.

Figure 4 is a schematic perspective view for explaining a cap-type hot stamping mold assembly according to another embodiment of the present invention, and Figures 5 and 6 are a cap-type hot stamping mold assembly according to another embodiment of the present invention. This is a schematic exploded perspective view for explanation.

The cap-type hot stamping mold assembly 200 (hereinafter referred to as 'mold assembly') according to another embodiment of the present invention shown in FIGS. 4 to 6 is an embodiment of the present invention described with reference to FIGS. 1 to 3. Compared to the cap-type hot stamping mold assembly 100 according to the embodiment, the configuration and effect are the same except for the first cap portion 214, the second cap portion 224, and the sealing unit 230, Descriptions other than the first cap part 214, the second cap part 224, and the sealing unit 230 will be omitted.

The first mold unit 210 includes a first insert part 212 having a first cooling channel (CH1) through which coolant flows, and a first internal space (S1) into which the first insert part 212 is inserted. It may include a first cap portion 214 having a first forming surface SF1 for giving the shape of the first region of the part to the TWB steel sheet.

The second mold unit 220 includes a second insert part 222 having a second cooling channel (CH2) through which the coolant flows, and a second internal space (S2) into which the second insert part 222 is inserted. ) and may be provided with a second cap portion 224 including a second forming surface SF2 for giving the shape of the second region of the part to the TWB steel sheet.

Here, the reason for corresponding each cap part to each insert part is to increase the convenience of maintenance and reduce costs in the case of the insert part with a short maintenance cycle due to damage, and to increase the convenience of maintenance and reduce costs, etc. This is to allow maintenance by separating only the corresponding cap part.

The first cap portion 214 and the second cap portion 224 are each configured to form a first intermediate channel (CCH1) and a second intermediate channel (CCH1) for communicating the first cooling channel (CH1) and the second cooling channel (CH2). An intermediate channel (CCH2) may be provided.

The first cooling channel (CH1) may include a plurality of cooling channels, that is, a 1-1 cooling channel (CH1-1) and a 1-2 cooling channel (CH1-2).

And, the second cooling channel (CH2) includes a plurality of cooling channels, that is, a 2-1 cooling channel (CH2-1) communicating with the 1-1 cooling channel (CH1-1), and the first- It may be provided with a 2-2 cooling channel (CH2-2) in communication with the 2 cooling channel (CH1-2).

Here, the first intermediate channel (CCH1) and the second intermediate channel (CCH2) communicate with the 1-1 cooling channel (CH1-1) and the 2-1 cooling channel (CH2-1), respectively. It may be provided with a 1-1 intermediate channel (CCH1-1) and a 2-1 intermediate channel (CCH2-1) for mediation.

In addition, the first intermediate channel (CCH1) and the second intermediate channel (CCH2) communicate with the 1-2 cooling channel (CH1-2) and the 2-2 cooling channel (CH2-2), respectively. It may be provided with a 1-2 intermediate channel (CCH1-2) and a 2-2 intermediate channel (CCH2-2) for mediation.

Here, the boundary portion between the 1-1 intermediate channel (CCH1-1) and the 2-1 intermediate channel (CCH2-1), and the 1-2 intermediate channel (CCH1-2) and the 2-2 The boundary portion of the intermediate channel (CCH2-2) is sealed by the sealing unit 230 to prevent leakage of coolant.

The sealing unit 230 is integrally formed to seal between the first cooling channel (CH1) and the second cooling channel (CH2), and may be formed as an overall V-shaped ring with a closed curve shape.

However, the sealing unit 230 is not necessarily limited to a V-shape, and may vary depending on the number and distribution position of cooling channels or intermediate channels.

A fixing groove G for inserting and fixing the sealing unit 230 may be formed on at least one of the opposing surfaces of the first cap part 214 and the second cap part 224.

The sealing unit 230 as described above can increase the efficiency of the assembly process and maximize durability at the same time compared to the conventional sealing technology that seals each channel with a donut-shaped O-ring.

Meanwhile, the sealing unit 230 may also be applied to the cap-type hot stamping mold assembly 100 according to an embodiment of the present invention described with reference to FIGS. 1 to 3.

In this case, the sealing unit 230 is disposed at the boundary between the 1-1 cooling channel and the 2-1 cooling channel, and at the boundary between the 1-2 cooling channel and the 2-2 cooling channel. , is formed integrally to seal between the first cooling channel (CH1) and the second cooling channel (CH2).

Figure 7 is a schematic perspective view for explaining a modified example of a sealing unit provided in a cap-type hot stamping mold assembly according to another embodiment of the present invention.

Referring to FIG. 7, the sealing unit 230' is a unit disposed between the first cap part and the second cap part 224, and can be inserted into the recessed space S4 provided by being embedded in the second cap part 224. there is.

The sealing unit 230' includes a first hole 232' for communication between the 1-1 intermediate channel and the 2-1 intermediate channel, and a first hole 232' for communication between the 1-2 intermediate channel and the 2-2 intermediate channel. It may be provided with a second hole portion 234' for communication, and a surface portion 236' for forming the first hole portion 232' and the second hole portion 234'.

As described above, the V-shaped pad-shaped sealing unit 230 can seal a plurality of channels with a single unit, and the assembly process is more efficient than the conventional sealing technology that seals each channel with a donut-shaped O-ring. It can increase durability while maximizing durability.

However, the sealing unit 230' is not necessarily limited to a V-shape, and may vary depending on the number and distribution position of cooling channels or intermediate channels.

Meanwhile, the sealing unit 230' may also be applied to the cap-type hot stamping mold assembly 100 according to an embodiment of the present invention described with reference to FIGS. 1 to 3.

In this case, the sealing unit 230' is disposed at the boundary between the 1-1 cooling channel and the 2-1 cooling channel, and at the boundary between the 1-2 cooling channel and the 2-2 cooling channel. and is formed integrally to seal between the first cooling channel and the second cooling channel.

Meanwhile, the above-described embodiment relates to a mold assembly in which the cap portion and the insert portion are fixed on the base portion 140 by welding or the like, but the present invention is not necessarily limited thereto.

For example, a cap-type hot stamping mold assembly according to another embodiment of the present invention includes a base portion for providing an inlet channel for coolant, and a communication channel for communicating the inlet channel with the cooling channel. It may include a connection part disposed between the base part and the insert part.

Here, the cooling channel may be formed by the interaction of the cap portion and the insert portion, and the cooling channel communicates with the communication channel.

The connection part may be a type of connection between an insert part and a base part to form a channel for cooling in the vertical direction.

Accordingly, the base portion is fixed to the connecting portion and welding, the connecting portion is fixed to the insert portion, and the cap portion is fixed to the insert portion to provide a mold assembly.

In the above, the configuration and features of the present invention have been described based on the embodiments according to the present invention, but the present invention is not limited thereto, and various changes or modifications may be made within the spirit and scope of the present invention. It is obvious to those skilled in the art, and therefore, it is stated that such changes or modifications fall within the scope of the appended patent claims.

100, 200: Cap type hot stamping mold assembly
110, 210: first mold unit
120, 220: second mold unit
112, 212: first insert
122, 222: second insert
140: Cap part
214: first cap portion
224: second cap portion
230, 230': Sealing unit
CH1: first cooling channel
CH2: second cooling channel
CCH1: first intermediate channel
CCH2: Second intermediate channel

Claims (9)

delete delete delete In the cap-type hot stamping mold assembly for forming a predetermined part by joining after the TWB (Tailor Welded Blank) steel plate is placed,
a first mold unit having a first molding surface for giving the TWB steel sheet a shape of a first region of the part and a first cooling channel through which coolant flows; and
A second mold unit having a second molding surface for giving the shape of the second area of the part to the TWB steel sheet and a second cooling channel through which the coolant flows,
The first cooling channel is,
It has a 1-1 cooling channel and a 1-2 cooling channel,
The second cooling channel is,
A 2-1 cooling channel communicating with the 1-1 cooling channel, and a 2-2 cooling channel communicating with the 1-2 cooling channel,
It is disposed at a boundary between the 1-1 cooling channel and the 2-1 cooling channel, and at a boundary between the 1-2 cooling channel and the 2-2 cooling channel, and is formed integrally with the first cooling channel. A cap-type hot stamping mold assembly further comprising a sealing unit for sealing between the channel and the second cooling channel.
According to paragraph 4,
The sealing unit is,
A first hole portion for communication between the 1-1 cooling channel and the 2-1 cooling channel, a second hole portion for communication between the 1-2 cooling channel and the 2-2 cooling channel, and the first hole portion for communication between the 1-2 cooling channel and the 2-2 cooling channel. A cap-type hot stamping mold assembly, characterized in that it has a hole portion and a surface portion for forming the second hole portion. delete delete delete delete

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