KR101886074B1 - Method and system for forming ultra high-tensile steel parts - Google Patents

Abstract

A method of manufacturing an ultra high strength steel part is disclosed. A method of manufacturing a super high strength steel part, comprising the steps of: (a) providing a blank cut from a steel sheet; (b) cold forming the blank in a shape corresponding to the finished product; (c) (D) moving the pallets to a heating chamber and heating the molding materials to a predetermined temperature in the heating chamber; (e) moving the pallets to a cooling chamber; Cooling the molding materials in the cooling chamber, and (f) calibrating the quality dimensions of the molding materials deformed in the heat treatment process and the cooling process.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a super high-strength steel part,

The present invention relates to an ultra high strength steel part manufacturing method and apparatus, and more particularly, to an ultra high strength steel part manufacturing method and an ultra high tensile steel part manufacturing method which can manufacture a body part of super high tensile steel through a heat hardening and cooling step, And a manufacturing method thereof.

Recently, in the automobile industry, the application of super high tensile strength steel has been expanding to improve the weight of the vehicle body and the safety of collision. As a hot stamping method, for example, a technique of forming a steel sheet of 600 MPa grade into an ultra high tensile steel of 1500 MPa grade can be cited.

For example, hot stamping molding technology is a method for producing a body part of super high tensile steel by heating a boron steel sheet excellent in heat treatment property to austenite region as a product material, and simultaneously converting the boron steel sheet into a martensite by hot- .

Such a hot stamping molding technique has been widely applied to secure the strength of the impact member such as the center pillar of the vehicle body, the roof rail, the bumper, the impact beam, etc., and to reduce the weight of the vehicle body by eliminating the reinforcing member.

Hot stamping molding technology is an essential technology for lightening the weight of the vehicle, and various studies are under way, but there are many problems to be solved.

As one of them, the hot stamping molding technique is incapable of applying the trimming mold in the trimming process in which the edge of the product material and the outline of the flange are sheared, because the entire product material after molding has an ultrahigh strength of the martensite structure.

Accordingly, laser trimming is applied in the art, and thus laser trimming is disadvantageous compared with trimming using a mold in terms of cost and production cycle time.

In addition, since the hot stamping molding technique described above is difficult to mass-produce and mixed production of the body parts and maintain the product material at a constant temperature, the productivity is low due to the long hot forming and cooling time in the mold, It is difficult to secure the quality of parts.

Embodiments of the present invention provide an ultra-high strength steel part manufacturing method and manufacturing apparatus capable of eliminating trimming using a laser, capable of mass production and mixed production of products, and further improving the quality of products.

A method of manufacturing an ultra high strength steel part according to an embodiment of the present invention includes the steps of: (a) providing a blank cut from a steel sheet, (b) cold forming the blank in a shape corresponding to the finished product, (c) (D) moving the pallets to a heating chamber and heating the molding materials to a predetermined temperature in the heating chamber; (e) heating the pallets to a cooling chamber And cooling the molding materials in the cooling chamber; and (f) calibrating the quality dimensions of the molding materials deformed in the heat treatment process and the cooling process.

Also, in the method of manufacturing the ultra high strength steel part according to the embodiment of the present invention, in the step (b), the blank may be subjected to draw forming, first trim, Processing can be progressed sequentially.

In addition, in the method of manufacturing an ultra high strength steel part according to an embodiment of the present invention, the blank can be cold-formed at a production speed of 6 seconds through the plurality of dies in a shape corresponding to the finished product.

Further, in the method of manufacturing an ultra-high strength steel part according to an embodiment of the present invention, in the step (c), the molding materials may be fixed through a clamper provided on the pallet.

Further, in the method for manufacturing a super high strength steel part according to an embodiment of the present invention, in the step (d), the molding material may be heated to 750 to 1000 ° C in the heating chamber.

Further, in the method of manufacturing the ultra high strength steel part according to the embodiment of the present invention, in the step (e), the molding materials may be cooled in the nitrogen atmosphere of the cooling chamber.

Further, in the method for manufacturing a super high strength steel part according to an embodiment of the present invention, in the step (e), cooling water may be sprayed through a cooling water injection unit provided on the pallets to cool the molding material.

Further, in the method for manufacturing a super high strength steel part according to an embodiment of the present invention, in the step (f), the molding material is fixed in the calibrator, and the twisting correction and the section correction of the molding material can be performed.

The apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention comprises: i) a cold forming unit for cold forming a blank cut from a steel sheet in a shape corresponding to the finished article; and ii) A plurality of pallets for fixing the materials, iii) a heating chamber for heating the molding materials fixed to the pallets to a predetermined temperature, iv) a cooling chamber for cooling the molding materials heated in the heating chamber, and v. ) May include a plurality of calibrators for calibrating the dimensions of the molding materials that have been heat treated in the heating chamber and cooled in the cooling chamber.

Further, in the apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention, the cold forming unit may include a first mold for draw-forming the blank, and a second mold for first trimming the outer periphery of the draw- A third mold for performing a list-like process on the blank subjected to the first trimming process, and a fourth mold for piercing and performing a second trimming process on the blank subjected to the list-like process.

The pallet may include a support frame, a plurality of storage plates mounted on the support frame in a plurality of layers and supporting the molding material, And a plurality of clamp fingers, which are mounted movably in the up and down direction by a plurality of clamp cylinders fixed to the molding material and support edge portions of the molding material, are integrally provided.

The pallet may include a support frame, a plurality of storage plates mounted on the support frame in a plurality of layers and supporting the molding material, And clampers for clamping the edge portions of the molding material.

The pallet may further include a cooling water injection unit provided in the support frame for injecting cooling water into the molding materials and cooling the molding materials. The apparatus for manufacturing ultra-high-strength steel parts according to an embodiment of the present invention may further include: have.

Further, in the apparatus for manufacturing ultra-high-strength steel parts according to an embodiment of the present invention, the support frame includes a plurality of vertical rods supporting respective corner portions of the storage plate, and a plurality of vertical rods And may include horizontal bars.

Further, in the apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention, the cooling water injection unit may include a cooling water supply passage formed to be connected to the inside of the vertical bar and the horizontal bar, And injection nozzles connected to the cooling water supply passage and injecting the cooling water into the molding material.

Further, in the apparatus for manufacturing ultra-high-strength steel parts according to an embodiment of the present invention, the calibrator includes a frame, a clamping unit installed on the frame and clamping the molding material, and a clamping unit A plurality of torsion correcting units provided on both sides of the molding material in the frame for gripping both flanges of the molding material, And a cross-sectional correction unit mounted on the frame to be rotatable up and down and to calibrate a flange section of the molding material.

In addition, in the ultra high strength steel part manufacturing apparatus according to an embodiment of the present invention, the clamping unit may include at least one clamping body which is vertically movable by a clamping cylinder.

Further, in the apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention, the twist-correction unit may include a rotation block provided to the frame so as to be rotatable in the left-right direction corresponding to one end of the molding material, And a first gripper installed to be connected to the first operation cylinder and movable up and down by the first operation cylinder and gripping one end of the molding material.

In addition, in the ultra-high-strength steel part manufacturing apparatus according to an embodiment of the present invention, the twist-correction unit may include a driving unit for rotating the rotary block in the left-right direction.

In addition, in the apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention, the drive unit may include a pinion gear coupled to a rotation center shaft of the rotary block, a pair of rack bars coupled to upper and lower sides of the pinion gear, And a pair of second actuating cylinders connected to the rack bar.

In addition, in the apparatus for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention, the cross-section correcting unit may include a rotating body provided on both sides of the forming material so as to be vertically rotatable in the frame, And a second gripper which is connected to the rotating body and grips the flange of the molding material. The second gripper may include a second operating cylinder fixed to the rotating body and hinged to the rotating body.

In addition, in the ultra high strength steel part manufacturing apparatus according to an embodiment of the present invention, the rotary body is guided in a locus hole of a support block provided in the frame and can be pivoted up and down.

Unlike the conventional hot stamping molding technique, the embodiment of the present invention can reduce the manufacturing cost by omitting the laser trimming process.

Further, in the embodiment of the present invention, since the steps of forming the product are automatically performed, the speed of production of the product can be improved, the mass production and the mixed production of the body parts can be performed, and the molding quality of the body parts can be improved .

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a block diagram schematically showing a configuration of an ultra high strength steel part manufacturing apparatus according to an embodiment of the present invention.
2 is a perspective view illustrating a pallet applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
3 is a perspective view showing a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
4 is a partial perspective view showing a clamping unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
5 and 6 are views showing a twist correction unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
FIG. 7 is a partial perspective view showing a cross-sectional correction unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
8 is a perspective view showing a cross-sectional correction unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
9 is a perspective view showing an operating state of a section calibration unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.
10 is a flow chart for explaining a method of manufacturing an ultra high strength steel part according to an embodiment of the present invention.
11 is a perspective view showing a modified example of a pallet applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish them from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

1 is a block diagram schematically showing a configuration of an ultra high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus 100 for manufacturing ultra-high-strength steel parts according to an embodiment of the present invention is for forming a 600 MPa-grade steel sheet into a body part of super high-strength steel of 1500 MPa.

For example, the ultra-high strength steel part manufacturing apparatus 100 can be manufactured by cold-forming a cut blank 1 from a boron steel plate or the like having excellent heat treatability and then subjecting the cold-formed molding material 3 (see FIG. 2) It is possible to manufacture an ultra-high strength body part of 1500 MPa class or higher.

Here, the body part may be a collision member such as a center pillar, a roof rail, a bumper, an impact beam, or the like.

Unlike the conventional hot stamping molding technique, the apparatus 100 for manufacturing ultra-high-strength steel parts according to the embodiment of the present invention can reduce the manufacturing cost by omitting the laser trimming process, It is possible to mass-produce and mixed-mix vehicle body parts, and furthermore, the structure quality of the vehicle body parts can be further improved.

That is, in the embodiment of the present invention, material shaping, trimming, piercing, and the like corresponding to the finished product are performed through a cold forming process. By heating the material to a high temperature and quenching it, To thereby provide a super high strength steel part manufacturing apparatus (100) capable of correcting dimensions of a formed product.

To this end, the ultra-high strength steel part manufacturing apparatus 100 according to an embodiment of the present invention basically comprises a cold forming unit 10, pallets 50, a heating chamber 70, a cooling chamber 80, and calibrators 200).

The cold forming unit 10 is for cold forming the blank 1 cut from the steel sheet 2 into a shape corresponding to the finished product.

Here, the blank 1 is cut from a coil-shaped steel sheet 2 to a size capable of being press-formed. Such a steel sheet 2 is a cold-rolled steel sheet, a hot-rolled steel sheet, a galvanized cold- Coated steel sheets, and the like.

The cold forming unit 10 sequentially performs the draw forming process, the first trim process, the list-like process, the piercing process and the second trim process of the blank 1, and the blank 1 is processed at a production rate of approximately 6 seconds And can be cold-formed in a shape corresponding to the article to be finished.

That is, the above-described processes are sequentially performed in the cold forming unit 10. These processes are collectively performed, and the above-described production speed can be satisfied. The cold forming unit 10 includes a plurality of first to fourth molds 11, 12, 13, and 14 made up of upper and lower molds.

The first metal mold 11 is for draw-forming the blank 1 and the second metal mold 12 is used for forming an outer portion of the draw-formed blank 1, that is, an unnecessary portion other than the shape corresponding to the article, For trimming processing.

The third mold 13 is for performing a list-like process on the blank 1 subjected to the first trimming process. The fourth mold 14 is a process for piercing the blank 1 subjected to the list- .

The reason for trimming the blank 1 through the second mold 12 and the fourth mold 14 is that the first mold 12 and the second mold 12 are divided into the first and second chambers, A part of the outer frame portion is first trimmed in the second mold 12 and the remaining outer frame portion in the fourth mold 14 is trimmed to 2 The trimming process is performed.

The reason why the blank 1 subjected to the first trimming process is processed through the second mold 12 is that the blank 1 after the drawing forming process of the blank 1 through the first mold 11, In order to reduce the spring back of the battery.

In the embodiment of the present invention, the pallet 50 has a plurality of molding materials 3 formed in a shape corresponding to the finished product by the molds 11, 12, 13, 14 of the cold forming unit 10 And to transfer it to a post-process.

2 is a perspective view illustrating a pallet applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, the pallet 50 according to the embodiment of the present invention is provided so as to be movable in a desired direction by a caster 52 provided at a corner of the lower surface of the base plate 51.

In addition, the pallet 50 is provided in a large number for mass production of the molded product and can be transferred to the heating chamber 70 and the cooling chamber 80, which will be described later through a conveying conveyor (not shown) have.

This pallet 50 includes a support frame 53, a plurality of storage plates 57, and clamping rods 61 as clamper.

The support frame 53 is for supporting the storage plates 57 to be described later.

The support frame 53 includes a plurality of vertical rods 54 installed vertically to the rectangular base plate 51 and supporting the respective corner portions of the storage plates 57.

The storage plates 57 are provided as rectangular plates for supporting the molding materials 3 and are mounted on the vertical rods 54 of the support frame 53 in multiple layers along the vertical direction.

In this case, a block-shaped support member 59 for supporting the molding material 3 is provided on the upper surface of the storage plate 57. The support member 59 has a shape corresponding to the molding material 3 and is fixed to the upper surface of the storage plate 57 and seats the molding material 3.

In the embodiment of the present invention, the clamping rods 61 function to clamp and fix the molding material 3 seated on the support member 59 of each storage plate 57. [

A plurality of clamping rods 61 are installed on both sides of the support frame 53 and vertically installed corresponding to the vertical rods 54. The clamping rods 61 are vertically movable by a plurality of clamping cylinders 63 substantially fixed to the support frame 53.

The clamp cylinder 63 is fixed to a fixed block 65 fixed to the lower surface of the lowermost storage plate 57 and a clamp rod 61 is vertically connected to the operation rod.

The clamping rods 61 are installed so as to penetrate through plate-shaped guide members 67 provided at both side edges of the storage plate 57 and can be moved up and down in a state of being supported by the guide members 67 have.

Here, the clamping rod 61 is provided integrally with clamp fingers 69 for supporting the edge portion (flange portion) of the molding material 3 that is seated on the supporting member 59.

The clamp fingers 69 are disposed on the clamp rod 61 at predetermined intervals along the vertical direction corresponding to the respective storage plates 57 and fixed to the clamp rod 61.

The clamp fingers 69 press the edge portions of the molding material 3 seated on the support members 59 against the clamp cylinder 63 by the force of the clamp cylinder 63 when the clamp rod 61 is lowered by the clamp cylinder 63 Quot; L "or" F " shape.

Meanwhile, in the embodiment of the present invention, the heating chamber 70 is for heating the molding materials 3 fixed to the pallets 50 to a predetermined temperature.

The heating chamber 70 is a heating furnace (also referred to as a "heat treatment furnace" in the art) capable of moving the pallets 50 to a post- (3) can be heated to a temperature range of 750 to 1000 占 폚 for 4 to 5 minutes.

And, in the embodiment of the present invention, the cooling chamber 80 is for quenching a plurality of the molding materials 3 heated in the heating chamber 70.

In the cooling chamber 80, the pallets 50 moved from the heating chamber 70 enter. The cooling chamber 80 may move the pallets 50 to a post-process. In the cooling chamber 80, nitrogen gas is injected into the chamber space to cool the molding materials 3 in the nitrogen atmosphere.

Hereinafter, a configuration of a calibrator 200 applied to the ultra-high strength steel part manufacturing apparatus 100 according to an embodiment of the present invention will be described in detail.

In an embodiment of the present invention, the calibrator 200 is for calibrating the dimensions of the molding materials 3 that have been heat treated in the heating chamber 70 and cooled in the cooling chamber 80.

3 is a perspective view showing a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

3, the calibrator 200 according to the embodiment of the present invention includes a frame 110, a clamping unit 210, a twist calibration unit 310, and a cross-sectional calibration unit 410.

The frame 110 is for supporting various components to be described later, and may have additional components such as various collars, brackets, support blocks, etc. for supporting these components.

However, in the embodiment of the present invention, the sub-elements are provided in the frame 110 and support various constituent elements. Therefore, the sub-elements are generally referred to as a frame 110 except for exceptional cases.

The clamping unit 210 is for clamping and fixing the molding material 3 loaded onto the frame 110.

4 is a partial perspective view showing a clamping unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

3 and 4, in the embodiment of the present invention, the clamping unit 210 is installed on the frame 110 so as to be movable up and down.

The clamping unit 210 includes at least one clamping body 213 which is vertically movably installed by the clamping cylinder 211.

Although the clamping bodies 213 are provided in the frame 110 in a single number, the clamping bodies 213 are not necessarily limited to the clamping bodies 213. The clamping bodies 213 may include a plurality of clamping bodies.

The clamping cylinder 211 is fixed to a support plate 217 provided on the upper side of the frame 110 through a plurality of support rods 215.

The operating rod 219 of the clamping cylinder 211 is provided with a moving plate 221 which is guided by the support rods 215 and moves up and down.

The clamping body 213 is installed on the lower surface of the moving plate 221 and moves up and down by the moving plate 221 to fix the molding material 3. [

The clamping body 213 is installed on the connecting member 223 fixed to the lower surface of the moving plate 221. [ The clamping body 213 has a shape corresponding to each part of the molding material 3 and has a shape corresponding to an end face of the part.

The twist correction unit 310 is for twisting and correcting the molding material 3 while rotating one end of the molding material 3 in a gripping state.

5 and 6 are views showing a twist correction unit of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 5 and 6, in the embodiment of the present invention, the twist correction unit 310 is configured to be rotatable in the left-right direction on the frame 110. FIG.

The twist correction unit 310 includes a rotation block 311, a first gripper 331, and a driving unit 351.

The rotary block 311 is rotatably mounted to the frame 110 in the left-right direction corresponding to one end of the molding material 3. [ The rotation block 311 is rotatably installed on the frame 110 in the left-right direction through a rotation center shaft 313. [

The first gripper 331 grips one end of the molding material 3 and is fixed to the rotary block 311 through a mounting bracket 333. The first gripper 331 is fixed by the first actuating cylinder 335 And is vertically movable.

The first gripper 331 includes a gripping pad 337 capable of pressing and gripping the molding material 3 and the gripping pad 337 is connected to the operating rod 336 of the first actuating cylinder 335 ).

The driving unit 351 rotates the rotation block 311 about the rotation center axis 313 in the left and right direction.

The drive unit 351 includes a pinion gear 353 coupled to the rotation center shaft 313 of the rotation block 311, a pair of rack bars 355 coupled to the upper and lower sides of the pinion gear 353, And a pair of second actuating cylinders 357 connected to the bar 355.

The rack bar 355 is coupled to the upper and lower sides of the pinion gear 353 and functions to convert the linear motion of the second actuating cylinder 357 into the rotational motion of the pinion gear 353.

The second actuating cylinder 357 is fixed to the frame 110, and the actuating rod 358 is coupled to the rack bar 355. In the pair of actuating cylinders 357, the actuating rods 358 move back and forth in opposite directions.

That is, as the operating rod 358 of the second operating cylinder 357 moves back and forth in the opposite direction, the rack bar 355 moves back and forth in opposite directions and rotates the pinion gear 353 in both directions The rotation center 313 can be rotated in the forward and reverse directions and the rotation block 311 can be rotated in the left and right direction.

The cross-sectional straightening unit 410 is for rotating both sides of the flange portion of the forming material 3 while gripping and correcting the flange section of the forming material 3.

FIG. 7 and FIG. 8 are partial perspective views showing a cross-sectional correction unit portion of a calibrator applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 7 and 8 together with FIG. 3, in the embodiment of the present invention, the cross-section correcting unit 410 is disposed at a plurality of positions on both sides of the molding material 3 in the frame 110, And is vertically rotatably mounted on the frame 110 in a state in which both flanges of the molding material 3 are gripped.

This section calibration unit 410 includes a rotating body 411, a third actuating cylinder 431 and a second gripper 451.

The rotating body 411 is rotatably mounted on the frame 110 on both sides of the molding material 3 and is supported by a supporting block 471 provided on the frame 110, Direction.

Here, the rotary body 411 is guided by the locus holes 473 provided at both sides of the support block 471 and can be pivoted up and down. The locus hole 473 is formed along the rotational locus of the rotating body 411. A pair of rollers 415 provided on both sides of the rotating body 411 are coupled to the locus hole 473.

The third actuating cylinder 431 is fixed to the frame 110 and is hinged to the rotating body 411 through a hinge pin 433. [

The second gripper 451 grips the edge portion (flange portion) of the molding material 3 and is connected to the rotating body 411.

9, the second gripper 451 grips the flange portion of the molding material 3, and the rotating body 411 rotates in the vertical direction by the driving of the third operating cylinder 431, The flange portion of the molding material 3 can be subjected to the cross-sectional correction.

Hereinafter, a method of manufacturing ultra high strength steel using the apparatus for manufacturing ultra-high strength steel part 100 according to an embodiment of the present invention will be described in detail with reference to the drawings and the accompanying drawings.

10 is a flow chart for explaining a method of manufacturing an ultra high strength steel part according to an embodiment of the present invention.

Referring to FIGS. 1 and 10, a blank 1 in which a coil-shaped steel sheet 2 is cut to a size capable of being press-formed is provided in an embodiment of the present invention (step S11).

Examples of the steel sheet 2 include cold-rolled steel sheets, hot-rolled steel sheets, galvanized cold-rolled steel sheets, and Al-Si boron-added coated steel sheets.

In the blanking process (step S11), the blank 1 is prepared to have a set weight relatively larger than the net weight of the finished product.

If the blank 1 is in a range smaller than the set weight, the part to be held by the pressing equipment is insufficient and the complete molding may not be performed. If the blank 1 is in a range larger than the set weight, the material is wasted and the cost increases.

Although it has been described above that the blank 1 is provided at a larger set weight based on the net weight of the finished article, the present invention is not necessarily limited to this, The blank 1 may be provided with a size of the blank.

Thereafter, in the embodiment of the present invention, the blank 1 is cold-formed into a shape corresponding to the article through the cold forming unit 10 (step S12).

In step S12, the draw forming process, the first trimming process, the list-like process, the piercing process, and the second trimming process of the blank 1 are sequentially performed through the first to fourth molds 11, 12, 13 and 14 .

Here, the first mold 11 draws the blank 1, the second mold 12 primarily trims the periphery of the draw-formed blank 1, and the third mold 13 The blank 1 subjected to the first trimming process is subjected to a list-like process, and the fourth mold 14 is subjected to the piercing process and the second trimming process for the blank 1 subjected to the list-like process.

In the cold forming unit 10, the above processes are sequentially performed through the first to fourth molds 11, 12, 13, and 14, and these processes are performed collectively, The blank 1 can be cold-formed in a shape corresponding to the article as a speed.

In the embodiment of the present invention, the trimming of the blank 1 is performed by dividing the blank 1 into the first and second order through the second mold 12 and the fourth mold 14, Since the scrap is not easily discharged because the scrap is large in size when the entire outer frame is trimmed, a part of the outer frame is first trimmed in the second mold 12, and the remaining outer frame The second portion is trimmed.

The reason why the blank 1 subjected to the first trimming process is processed through the second mold 12 is that the blank 1 after the drawing forming process of the blank 1 through the first mold 11, In order to reduce the spring back of the battery.

After the cold forming process of the blank 1 is completed through the cold forming unit 10 as described above, in the embodiment of the present invention, the molding materials 3, which are formed in a shape corresponding to the finished product, And the molding materials 3 are clamped and fixed (step S13).

The molding material clamping process in the step S13 will be described in detail. In the embodiment of the present invention, the molding materials 3 having undergone the cold forming process in the cold forming unit 10 are transferred to the pallets 50 through a robot or a shuttle system. (Loaded) on a support member 59 on each storage plate 57 of the housing.

Then, in the embodiment of the present invention, the clamping cylinders 63 are operated to lower the clamping rods 61. Then, the clamp rods 61 are guided by the guide member 67 and moved downward.

The clamp fingers 69 of the clamping rods 61 clamp the edge portion (flange portion) of the molding material 3 seated on the support member 59 on each storage plate 57 to the clamp cylinder 63).

In the embodiment of the present invention, the pallets 50 are moved to the heating chamber 70 with the molding materials 3 fixed to the pallets 50 as described above.

Then, in the heating chamber 70, the molding materials 3 are heated to a temperature range of 750 to 1000 ° C for 4 to 5 minutes (S14).

The reason for heating the forming materials 3 at the temperature conditions as described above is that the steel material must be heated to austenite stabilization temperature of 750 ° C. or more and 1000 ° C. or less to ensure the strength required by the parts after quenching This is because if the heating temperature exceeds 1000 캜, the coating layer of the molding material 3 can evaporate.

On the other hand, when the molding materials 3 are heated to a temperature of less than 750 DEG C, a uniform and stabilized austenite structure can not be obtained.

The above-mentioned heating time of the molding materials 3 is intended to obtain a uniform structure by stress relief of the molding material 3 and ensure uniform workability in the post-heating process, The degree of formation of retained austenite becomes insufficient, and if it exceeds 5 minutes, the austenite grains grow and the strength of the final product tends to decrease after quenching.

Thereafter, in an embodiment of the present invention, the pallets 50 are moved to the cooling chamber 80. Then, in the cooling chamber 80, a nitrogen gas atmosphere is formed, and the molding materials 3 fixed to the pallets 50 are cooled with nitrogen gas for 3 seconds (step S15).

Therefore, in the embodiment of the present invention, the molding materials 3 heated to a predetermined temperature are rapidly quenched into nitrogen gas in the cooling chamber 80, thereby transforming the molding materials 3 into martensitic structure and providing sufficient strength and high tensile strength So that it can be given to the molding material 3.

On the other hand, when the heat treatment process and the cooling process of the molding materials 3 are completed as described above, the dimension of the molding material 3 deformed in the heat treatment process and the cooling process is calibrated through the calibrator 200 as a subsequent process (Step S16).

In the present embodiment, the molding material 3 is unloaded from the pallets 50 through a robot or a shuttle system. In this case, And loads the molding material 3 into the frame 110.

Then, the clamping body 213 of the clamping unit 210 is moved downward by the clamping cylinder 211 and clamps the molding material 3.

In the embodiment of the present invention in which the molding material 3 is clamped through the clamping unit 210 as described above, the first gripper 331 of the twist-correcting unit 310 clamps the molding material 3 at one end .

In the embodiment of the present invention, the rotation center axis 313 of the rotation block 311 is rotated in one direction or the other direction through the driving unit 351 of the twist correction unit 310, and the rotation block 311 is rotated Left or right direction.

Then, by rotating the rotary block 311 through the driving part 351 while gripping the molding material 3 through the first gripper 331 as described above, the loop part of the molding material 3 is twisted and corrected .

As the actuating rod 358 of the second actuating cylinder 357 moves back and forth in the opposite direction, the actuating part 351 moves the rack bars 355 back and forth in opposite directions to each other and the rack bars 355 The pinion gear 353 can be rotated in one direction or in another direction.

Accordingly, the rotation center axis 313 is rotated in one direction or another direction, and the rotation block 311 can be rotated in the left or right direction around the rotation center axis 313.

After the twisting correction process of the molding material 3 is performed, the flange section of the molding material 3 is calibrated through the section correcting unit 410 in the embodiment of the present invention.

Specifically, in the embodiment of the present invention, the third actuating cylinder 431 of the section correcting unit 410 is operated to rotate the rotating body 411 in the downward direction, and the molding material 3 is rotated through the second gripper 451, As shown in Fig.

Therefore, in the embodiment of the present invention in which the flange portion of the molding material 3 is gripped through the second gripper 451, the third operation cylinder 431 is operated to rotate the rotating body 411 The flange portion of the molding material 3 can be subjected to the cross-sectional correction by turning in the vertical direction.

The rotary body 411 can be pivoted up and down along the locus of the locus hole 473 by the roller 415 coupled to the locus hole 473 of the support block 471. [

Thus, in the embodiment of the present invention, the quality dimension correction of the molding material 3 is performed through the above-described calibrator 200, thereby completing the final product molding of a desired dimension.

As described above, according to the apparatus for manufacturing an ultra-high strength steel part 100 according to an embodiment of the present invention and the method for manufacturing an ultra high strength steel part using the same, unlike the conventional hot stamp forming technique, the laser trimming step is omitted, can do.

Further, in the embodiment of the present invention, the steps of forming the product are automatically performed, the heat treatment and the cooling time are short, the productivity can be improved, and the mass production and mixed production of the body parts are advantageous.

Furthermore, in the embodiment of the present invention, since the product material can be maintained at a constant temperature in the heating chamber, the molding quality of the body part can be further improved.

11 is a perspective view showing a modified example of a pallet applied to an ultra-high strength steel part manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 1 and 11, an ultra-high strength steel part manufacturing apparatus 100 according to an embodiment of the present invention is configured to cool a forming material 3 by using nitrogen gas in a cooling chamber 80, A pallet 810 for cooling the materials 3 can be constructed.

In an embodiment of the present invention, the pallet 810 includes a support frame 811, a plurality of rectangular storage plates 813, a plurality of clamper members 851, and a cooling water injection unit 871.

The support frame 811 is for supporting the storage plates 813 and includes a plurality of vertical rods 815 for supporting the respective corner portions of the storage plates 813, And horizontally connecting the horizontal bars 817 in the horizontal direction.

Here, the vertical bars 815 support (connect) the respective corners of the rectangular storage plates 813 and are disposed upright in the vertical direction. In this case, the vertical bars 815 are formed in the shape of a pipe whose upper end is closed and whose lower end is open.

The horizontal bars 817 support the vertical bars 815 and connect the vertical bars 815 in the horizontal and vertical directions respectively corresponding to the respective storage plates 813.

In this case, the horizontal bars 817 are formed in the shape of a pipe having open ends at both ends thereof connected to the vertical bars 815, and the inside of the horizontal bars 817 is connected to the inside of the vertical bars 815 Can be connected.

The storage plates 813 are provided as rectangular plates for supporting the molding material 3 and are mounted on the vertical bars 815 of the support frame 811 in multiple layers along the vertical direction.

The edges of each storage plate 813 are connected to vertical bars 815 which extend through the respective corners of the storage plate 813 and can be welded to the corners thereof have.

The clamper 851 is for clamping and fixing the edge portion (flange portion) of the molding material 3 loaded on each storage plate 813.

The clamper 851 may be continuously installed on the storage plate 813 in correspondence with the edge portion of the molding material 3 placed on the storage plate 813.

The clamper 851 includes a locator (not shown in the figure) for locating the edge portion of the molding material 3, a clamp body 853 for regulating an edge portion of the locator and the clamp body 853, And a clamp cylinder 855 for rotating the clamp body 853 as a forward and backward movement of the operation rod.

Since these clampers 851 are formed as a known clamping device for clamping and regulating a predetermined part, a detailed description of the construction will be omitted in this specification.

In the embodiment of the present invention, the cooling water injection unit 871 injects cooling water into the molding materials 3 heat-treated in a clamped state by the clamper 851 in the heating chamber 70, 3).

The cooling water jetting unit 871 is formed in the support frame 811 of the pallet 810 and includes a cooling water supply passage 881 formed in the vertical bars 815 and the horizontal bars 817 of the support frame 811, And a plurality of spray nozzles 883 continuously installed on the vertical rods 815 and horizontal rods 817.

The cooling water supply passage 881 may be formed as an inner space of the vertical bar 815 and the horizontal bar 817. The vertical bars 815 and the horizontal bars 817 are formed in a pipe shape.

In this case, the vertical rods 815 and the cooling water supply passages 881 inside the horizontal rods 817 are interconnected. Since the vertical bars 815 are formed in a pipe shape having an upper end closed and a lower end opened, cooling water may flow into the lower end thereof.

That is, a cooling water inflow portion 885 through which the cooling water can flow into the cooling water supply passage 881 is formed at the lower end of the vertical rods 815.

Therefore, the cooling water introduced into the cooling water inflow portion 885 can flow along the cooling water supply passage 881 inside the vertical rods 815 and the horizontal rods 817.

The injection nozzles 883 are for injecting cooling water flowing along the vertical bars 815 and the cooling water supply passage 881 in the horizontal bars 817 into the molding material 3 on the storage plate 813.

The injection nozzles 883 are continuously provided on the vertical rods 815 and the horizontal rods 817 at predetermined intervals along the longitudinal direction of the vertical rods 815 and the horizontal rods 817, Lt; RTI ID = 0.0 > 881 < / RTI >

Accordingly, in the embodiment of the present invention, the cooling water flowing into the cooling water inflow portion 885 of the vertical rods 815 flows along the cooling water supply passage 881 inside the vertical rods 815 and horizontal rods 817 Can be injected through the injection nozzles 883 into the molding material 3 on the storage plate 813.

The pallets 810 are moved to the cooling chamber 80 through the cooling water injection unit 871 of the pallets 810 in the cooling chamber 80 so that the molding materials 3) so that the molding materials 3 can be quenched.

In the embodiment of the present invention, the cooling water is sprayed through the cooling water spraying unit 871 provided on the pallets 810 without using a cooling medium such as nitrogen gas as described above to cool the molding materials 3 Therefore, the configuration of the entire system can be simplified, and the initial investment cost can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

1 ... Blank 2 ... Steel sheet
3 ... molding material 10 ... cold forming unit
11 ... first mold 12 ... second mold
13 ... third mold 14 ... fourth mold
50, 810 ... pallet 53 ... support frame
61 ... clamp rod 69 ... clamp finger
70 ... heating chamber 80 ... cooling chamber
200 ... calibrator 210 ... clamping unit
310 ... torsion correction unit 410 ... section correction unit
871 ... Cooling water injection unit

Claims (21)

(a) providing a cut blank from a sheet of steel sheet;
(b) cold-forming the blank in a shape corresponding to the finished article;
(c) fixing the cold-formed molding materials to a plurality of pallets;
(d) moving the pallets to a heating chamber and heating the molding materials to a predetermined temperature in the heating chamber;
(e) moving the pallets to a cooling chamber and cooling the forming materials in the cooling chamber; And
(f) calibrating the quality dimensions of the molding materials deformed in the heat treatment process and the cooling process through a calibrator;
/ RTI >
In the step (f), the molding material is fixed through the clamping unit in the calibrator, the twisting correction of the molding material is performed through the twist correction unit, and the cross-sectional calibration unit is used to calibrate the flange section of the molding material. Way. The method according to claim 1,
In the step (b)
Wherein the blank is sequentially subjected to a draw forming process, a first trimming process, a list-like process, a piercing process, and a second trimming process sequentially through a plurality of dies. 3. The method of claim 2,
Wherein the blank is cold-formed at a production speed of 6 seconds through the plurality of dies in a shape corresponding to the article to be finished. The method according to claim 1,
In the step (c)
And fixing the molding materials through a clamper provided on the pallet. The method according to claim 1,
In the step (d)
And heating the molding material to 750 to 1000 占 폚 in the heating chamber. The method according to claim 1,
In the step (e)
And cooling the molding materials in a nitrogen atmosphere of the cooling chamber. The method according to claim 1,
In the step (e)
And cooling the molding material by injecting cooling water through a cooling water injection unit provided on the pallets. delete A cold forming unit for cold forming the blank cut from the steel sheet in a shape corresponding to the finished product;
A plurality of pallets for fixing the molding materials molded by the cold forming unit;
A heating chamber for heating the molding materials fixed to the pallets to a predetermined temperature;
A cooling chamber for cooling the molding materials heated in the heating chamber; And
A plurality of calibrators for calibrating the dimensions of the molding materials heat-treated in the heating chamber and cooled in the cooling chamber,
The clamping unit includes a frame, a clamping unit installed on the frame and clamping the molding material, and a clamping unit installed to the frame so as to be rotatable to the left and right, gripping one end of the molding material, And a plurality of flanges disposed on both sides of the molding material in the frame and gripped on both flanges of the molding material so as to be vertically rotatable on the frame, And a cross-sectional calibration unit for calibrating the cross-sectional area of the workpiece. 10. The method of claim 9,
The cold forming unit comprises:
A first mold for draw-forming the blank,
A second mold for primarily trimming the outer frame of the draw-formed blank,
A third mold for performing a list-like process on the blank subjected to the first trimming process,
A fourth mold for piercing and second trimming the blank which has been subjected to the list-
And a super high-strength steel part manufacturing device. 10. The method of claim 9,
The pallet includes:
A support frame,
A plurality of storage plates mounted on the support frame in a plurality of layers to support the molding material,
And a plurality of clamp fingers which are installed movably in the vertical direction by a plurality of clamp cylinders fixed to the support frame and support edge portions of the molding material,
And a super high-strength steel part manufacturing device. 10. The method of claim 9,
The pallet includes:
A support frame,
A plurality of storage plates mounted on the support frame in a plurality of layers to support the molding material,
And a plurality of clamper plates installed on the storage plate for clamping the edges of the molding material,
And a super high-strength steel part manufacturing device. 13. The method of claim 12,
The pallet includes:
A cooling water jetting unit provided in the support frame for jetting cooling water to the molding materials and cooling the molding materials,
Further comprising: 14. The method of claim 13,
The support frame includes:
A plurality of vertical rods supporting respective corner portions of the storage plate,
And a plurality of horizontal bars connecting the vertical bars in a horizontal direction. 15. The method of claim 14,
The cooling water jetting unit includes:
A cooling water supply passage formed to be connected to the inside of the vertical bar and the horizontal bar,
A plurality of injection nozzles continuously connected to the vertical rods and the horizontal bar, connected to the cooling water supply passage and injecting the cooling water into the molding material,
And a super high-strength steel part manufacturing device. delete 10. The method of claim 9,
Wherein the clamping unit includes at least one clamping body movably installed in a vertical direction by a clamping cylinder. 10. The method of claim 9,
The twist-correcting unit includes:
A rotation block provided to the frame so as to be rotatable in the left and right direction, corresponding to one end of the molding material;
A first gripper which is installed to be connected to the rotary block and which is installed so as to be movable up and down by a first operating cylinder and which grips one end of the molding material,
And a super high strength steel part manufacturing device. 19. The method of claim 18,
Wherein the twist-correction unit includes a driving unit for rotating the rotary block in the left-right direction,
The driving unit includes a pinion gear coupled to a rotational center shaft of the rotary block, a pair of rack bars coupled to upper and lower sides of the pinion gear, and a pair of second operating cylinders connected to the rack bar High tensile steel part manufacturing apparatus. 10. The method of claim 9,
The cross-
A rotating body rotatably mounted on the frame at both sides of the molding material,
A third operating cylinder fixed to the frame and hinged to the rotating body,
A second gripper installed to be connected to the rotating body and gripping a flange portion of the molding material,
And a super high strength steel part manufacturing device. 21. The method of claim 20,
The rotating body includes:
Is guided in a locus hole of a support block installed in the frame and is pivoted in a vertical direction.

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