KR101234741B1 - hot blow forming apparatus, mold for hot blow forming and hot blow forming method - Google Patents

hot blow forming apparatus, mold for hot blow forming and hot blow forming method Download PDF

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KR101234741B1
KR101234741B1 KR1020100097134A KR20100097134A KR101234741B1 KR 101234741 B1 KR101234741 B1 KR 101234741B1 KR 1020100097134 A KR1020100097134 A KR 1020100097134A KR 20100097134 A KR20100097134 A KR 20100097134A KR 101234741 B1 KR101234741 B1 KR 101234741B1
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South Korea
Prior art keywords
mold part
mold
inner groove
molding
protrusion
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KR1020100097134A
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Korean (ko)
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KR20120035550A (en
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김동옥
유용문
한범석
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자동차부품연구원
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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

A warm gas forming apparatus and a warm gas forming method are provided. According to a warm gas forming apparatus according to an embodiment of the present invention, a first mold part including an inner groove corresponding to a shape of a molding and a material inlet around the inner groove is provided. The second mold part is coupled to the first mold part with the molding material interposed therebetween. The gas supply part supplies gas to the groove through the second mold part to pressurize the shaped material.

Description

Warm gas forming apparatus, mold for warm gas forming and warm gas forming method {hot blow forming apparatus, mold for hot blow forming and hot blow forming method}

The present invention relates to a molding apparatus using a mold, and more particularly to a warm gas molding apparatus and a molding method using the same.

Press molding of metal sheets is a plastic processing method that is widely used for manufacturing parts such as automobile parts, machines, electronic devices, etc., because of their high productivity and high precision processing. According to the recent trend of lighter weight of the material, aluminum, magnesium, and the like, which are in the spotlight, have difficulty in forming. In order to improve the moldability of such a hardly forming plate, a warm gas forming method is used in which a plate is heated and then molded into a high-pressure gas.

However, even when the degree of molding is somewhat large even under the conventional warm gas molding method, the difficulty of molding is difficult because the stretching of the refractory forming plate is limited. In particular, when forming a tailor rolled blank (TRB) material whose thickness is not constant, it is more difficult to form the gas pressure due to the outflow of gas due to the plate thickness difference. Accordingly, one object of the present invention is to provide a warm gas forming apparatus and a warm gas forming method using the same, which can improve the formability of not only steel sheet but also TRB sheet and the refractory forming material. These tasks are presented by way of example, and the scope of the present invention is not limited by these tasks.

The warm gas forming apparatus of one embodiment of the present invention is provided. A first mold portion is provided that includes an inner groove corresponding to the shape of the molding and a material inlet around the inner groove. The second mold part is coupled to the first mold part with the molding material interposed therebetween. The gas supply part supplies gas to the groove through the second mold part to pressurize the shaped material.

In one example of the apparatus, the material inlet may include an inclined surface for separating the molding material onto the material inlet. Further, the inclined surface of the material inlet may be formed to be inclined inward so that the separation distance between the molded material and the inclined surface increases toward the inner groove direction.

In another example of the apparatus, a sealing unit may be further provided disposed between the first mold portion and the second mold portion outside the material inlet portion to seal the gas supplied from the gas supply portion.

In another example of the apparatus, the sealing unit comprises: a protrusion on any one of the first mold portion and the second mold portion; And a recess formed on the other one of the first mold part and the second mold part and coupled with the protrusion to have a margin between the protrusion to allow additional plastic flow of the molding.

The metal mold | die for warm gas molding which concerns on one form of this invention is provided. A first mold portion is provided comprising an inner groove corresponding to the shape of the molding and a material inlet with an inclined surface around the inner groove. The second mold part is coupled to the first mold part with the molding material interposed therebetween, and includes a gas inlet through which gas for pressurizing the molding material is supplied.

A warm gas forming method of one embodiment of the present invention is provided. Preheat the workpiece. The shaped material is mounted in a mold including an inner groove corresponding to a shape of a molding to be formed from the molded material and a material inlet around the inner groove. The molded object is pressurized into the inner groove while supplying gas to the inner groove of the mold to allow stretching of the molded material from the material inlet into the inner groove.

According to the warm gas forming apparatus or the warm gas forming method according to the embodiments of the present invention, by placing the material inlet around the inner groove to allow the molded material to be further stretched from around the inner groove into the inner groove, Only in the inner groove can prevent excessive stretching.

In addition, according to the warm gas forming apparatus or the warm gas forming method according to the embodiments of the present invention, by arranging the margin in the sealing unit, the relationship between the shape or the thickness distribution of the molding material when the first mold portion and the second mold portion are combined Material flow can be used to prevent gas leakage.

Accordingly, by using the warm gas forming apparatus or the warm gas forming method according to the embodiments of the present invention, it is possible to stably mold the formed material including not only steel but also the refractory lightweight material, such as aluminum or magnesium. In addition, the moldability can also be improved for the TRB sheet.

1 is a schematic perspective view showing a warm gas forming apparatus according to an embodiment of the present invention;
2 is a cross-sectional view of the warm gas forming apparatus of FIG. 1;
3 is a cross-sectional view showing a warm gas forming apparatus according to another embodiment of the present invention;
4 is a schematic flowchart showing a warm gas forming method according to an embodiment of the present invention;
5 and 6 are cross-sectional views showing a warm gas forming method according to an embodiment of the present invention; And
7 is a view schematically showing a sealing shape according to the plate thickness when forming the TRB sheet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. In the drawings, the components may be exaggerated or reduced in size for convenience of description.

In embodiments of the present invention, the warm gas forming or warm gas forming apparatus may be referred to as a hot gas forming or hot gas forming apparatus. In addition, in embodiments of the present invention, the warm gas forming apparatus may substantially mean a mold or may mean a molding apparatus in a broader sense including such a mold.

1 is a schematic perspective view showing a warm gas forming apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the warm gas forming apparatus of FIG. 1.

1 and 2, the first mold part 110 may be provided under the molding material 50, and the second mold part 120 may be provided on the molding material 50. . In this sense, the first mold part 110 may be referred to as a lower mold, and the second mold part 120 may be referred to as an upper mold. However, in the modified example of this embodiment, the positions of the first mold part 110 and the second mold part 120 may be interchanged, in which case the first mold part 110 is called an upper mold, and the second The mold part 120 may also be called a lower mold.

The first mold part 110 may include an inner groove 112 corresponding to the shape of the molding to be molded from the molded object 50. For example, the inner groove 112 may have a shape that is recessed in a predetermined shape and a predetermined depth from the surface of the first mold part 110. As described below, the molded object 50 may be molded along the inner groove 112. The inner groove 112 may be variously modified according to the molding shape and the degree of molding of the molded object 50, and does not limit the scope of this embodiment. For example, the inner groove 112 can be used not only for moldings that require a shallow molding depth, but also for moldings that require significant molding depth, such as automotive center pillars.

In addition, the first mold part 110 may further include a material inlet part 114 around the inner groove 112 to assist in molding the molding member 50. The material inlet 114 allows the mold member 50 to be additionally stretched into the inner groove 112 during molding of the mold member 50 to prevent breakage due to excessive molding of the mold member 50. Can give For example, when the first mold part 110 and the second mold part 120 are coupled to each other, the material inlet 114 has the first mold part (3) formed around the inner groove 112. It may be to be spaced apart from the surface of the first mold portion 110 without being in close contact with 110.

For example, the material inlet 114 may include an inclined surface 116. The inclined surface 116 may be formed such that the distance from the molded object 50 to the surface of the first mold portion 110 gradually increases from the outside of the first mold portion 110 toward the inner groove 112. have. Accordingly, the inclined surface 116 may be inclined while having a predetermined inclination angle (hereinafter, referred to as a clearance angle) 117 from the outside of the first mold part 110 toward the inner groove 112. Due to the inclined surface 116, a space between the surface of the first mold part 110 and the mold member 50 in the material inlet part 114 may be formed.

The clearance angle 117 formed between the horizontal plane (dotted line) and the inclined surface 116 of the first mold part 110 depends on the depth or volume of the inner groove 112 that determines the material and the degree of molding of the molded object 50. Can vary. For example, the clearance angle 117 may increase as the depth of the inner groove 112 becomes deep or bulky. When the molded object 50 is a metal plate, the clearance angle 117 may be at least 5 ° in order to secure proper stretching. Further, in order to reduce the shape change due to the material inlet 114, the clearance angle 117 may be limited to within 10 o . However, depending on the material or the degree of molding of the molded object 50, the range of the clearance angle 117 may be out of this range.

In this embodiment, the inclined surface 116 may be straight. However, in a modified example of this embodiment, the inclined surface 116 may be curved. In addition, in another modified example of this embodiment, the inclined surface 116 may include a multistage straight form, a multistage curved form, or a combination thereof including a stepped portion.

The second mold part 120 may be disposed on an opposite side of the first mold part 110 with the molding material 50 therebetween. When molding the molded object 50, the second mold part 120 may be coupled to the first mold part 110 while pressing the molded object 50. The second mold part 120 may include a gas supply part 124 supplying a gas 60 for pressurizing the molding material 50.

The gas supply part 124 may include a gas inlet 126 formed to supply the gas 60 over the inner groove 112 of the first mold part 110. The gas inlet 126 may be formed through the second mold part 120. For example, the gas supply part 124 may be disposed perpendicular to the mold 50 directly above the center of the inner groove 112. In this case, the high pressure gas 60 pressurized to a predetermined pressure through the gas inlet 126 may be symmetrically supplied onto the molded object 50. In a modified example of this embodiment, the position and angle of the gas inlet 126 may vary.

The first mold part 110 and the second mold part 120 may be properly sealed to prevent the pressurized gas 60 from leaking. For example, the first mold part 110 and the second mold part 120 may be coupled through a sealing unit 130 disposed at an outer side of the inner groove 112 and the material inlet 116. In this embodiment, the sealing unit 130 is formed of the protrusions 128 and the molded object 50 of the first mold part 120 disposed on the surface facing the molded object 50 of the second mold part 120. It may include a recess 118 disposed on the surface facing (). For example, the protrusion 128 may be called a bead.

The protrusion 128 and the recess 118 may be disposed to face each other near edges of the second mold part 120 and the first mold part 110. The protrusion 128 and the recess 118 may be disposed to substantially surround the material inlet 116. Meanwhile, in the modified example of this embodiment, the protrusion 128 may be formed on the first mold part 110, and the recessed part 118 may be formed on the second mold part 120.

The recessed portion 118 may be formed to spread more widely than the protrusion 128 so as to define a margin (see 119 of FIG. 5) therebetween when engaged with the protrusion 128. That is, the protrusions 128 and the recesses 118 may not be coupled to fit together, but may be coupled so that the margin portion 119 of FIG. 5 is defined therebetween. For example, the recess 118 may have a gentle slope to spread laterally than the protrusion 128. As described later, the allowance (119 of FIG. 5) allows for additional plastic flow of the molded object 50 so that the thickness of the molded object 50 is changed or the molded material 50 has various thickness distributions. Even though having the molded object 50 and the sealing unit 130 to be sealed to each other.

Optionally, the first mold part 110 and the second mold part 120 may include a heating cartridge (not shown) therein to increase moldability. Thereby, the to-be-molded material 50 can be warm-formed or hot-formed.

In this embodiment, the coupling structure of the first mold part 110 and the second mold part 120 may substantially constitute a mold used in the warm gas forming apparatus.

According to the above-described warm gas forming apparatus, by injecting a high-pressure gas 60, the molded object 50 of various materials can be molded. In addition, by arranging the material inlet portion 114 to have a free space around the inner groove 112, the molding member 50 can be additionally drawn into the inner groove 112 from around the inner groove 112. have. This additional stretching can greatly reduce the fracture of the molded object 50 as compared to the case where the molded object 50 is excessively drawn only in the inner groove 112.

Accordingly, by using the above-described warm gas forming apparatus, it is possible to stably mold the molded object 50 including not only steel but also a hardly forming lightweight material such as aluminum or magnesium. In addition, the leakage of the gas 60 can be prevented through the sealing unit 130, so that the molded material 50 including the sheet material having a uniform thickness, for example, a Taylor Rolled Blank (TRB) material, can be stably formed. Can be.

Such a TRB sheet may be thickened at a portion where structural rigidity is required, and relatively thin at a portion where structural rigidity is relatively less required. Accordingly, the TRB sheet material can be used for parts that require safety (structural rigidity) and weight reduction, such as automotive center pillars.

3 is a cross-sectional view showing a warm gas forming apparatus according to another embodiment of the present invention. The warm gas forming apparatus according to this embodiment is a modification of some of the configuration in the warm gas forming apparatus of FIG. 2, and thus duplicated description is omitted in the two embodiments.

Referring to FIG. 3, the inner groove 112a in the first mold part 110a may be asymmetrically disposed unlike the inner groove 112 of FIG. 2. In this case, the shape of the material inlet 114a may also have an asymmetric shape according to the shape of the inner groove 112a. For example, the clearance angle 117 may have a portion around the relatively deep inner groove 112a greater than a portion around the relatively shallow inner groove 112a.

Accordingly, during molding of the molded object 50, the additional stretching to the deep portion of the inner groove 112a may be larger, and the additional stretching to the shallow portion of the inner groove 112a may be less. Nevertheless, in the modified example of this embodiment, regardless of the shape of the inner groove 112a, the shape of the material inlet 114a may be symmetrically formed.

4 is a schematic flowchart showing a warm gas forming method according to an embodiment of the present invention. 5 and 6 are cross-sectional views showing a warm gas forming method according to an embodiment of the present invention.

4 and 5, first, the molding member 50 may be preheated to a predetermined temperature (S10). Such preheating may increase the moldability of the molded object 50. Next, the molded object 50 can be mounted in a mold (S20). For example, the molding material 50 may be placed on the first mold part 110, and the second mold part 120 may be coupled thereon. The first mold part 110 and the second mold part 120 may be heated to a suitable temperature, for example, in the range of about 400 to 500 ° C. in the case of an aluminum or magnesium plate.

In this coupling step, the first mold part 110 and the second mold part 120 may be sealed through the sealing unit 130. When pressure is applied between the first mold part 110 and the second mold part 120, the molded part 50 in the sealing unit 130 is partially plastically deformed and pushed out, and the protrusions in the sealing unit 130 are pushed out. It may be in close contact between the 128 and the recess 118. Experimentally, when using this sealing unit 130, the sealing could be maintained up to a gas pressure of about 45 bar.

In particular, when the molded material 50 is a TRB plate material having various thickness distribution, the thickness of the molded material 50 in the sealing unit 130 may not be constant. However, even in this case, the thickness difference of the molding member 50 pressed at the tip of the protrusion 128 and the recessed portion 118 can be kept constant by plastically flowing into the margin 119 by the thickness difference. Accordingly, the sealing force can be maintained even for the TRB sheet so that the gas pressure does not leak.

As shown in FIG. 7, it can be seen that the 2 mm plate (a) and the 1 mm plate (b) are equally compressed to have a thickness of 1 mm to be combined with the sealing unit 130. In this case, it can be seen that the amount of plastic flow that is pushed into the receiving portion 119 is larger in the case of the 2 mm plate (a) than in the case of the 1.5 mm plate (b).

4 and 6, the injection molding member 50 may be press-molded by injecting the gas 60 into the inner groove 112 of the mold (S30). For example, when the high pressure gas 60 is injected into the gas inlet 126, pressure may be applied to the molded object 50. Subsequently, by this pressure, the molded object 50 can be molded into the inner groove 112.

In this forming step, the molding member 50 at the edge portion of the inner groove 112 may be further drawn into the inner groove 112 because it is floating and not fixed due to the material inlet 114. That is, the material inlet 114 may additionally provide a part of the molding member 50 for the margin into the inner groove 112, and thus the mold member 50 is excessively formed in the inner groove 112. It can prevent it from stretching and breaking.

The molded article formed in the above manner may be used as a TRB part having a constant thickness as well as a part having a constant thickness. For example, the TRB part may comprise a vehicle center pillar.

The foregoing description of specific embodiments of the invention has been presented for purposes of illustration and description. Therefore, the present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art within the technical spirit of the present invention in combination with the above embodiments. Do.

50: molding material 60: gas
110: first mold 112: inner groove
114: material inlet 116: slope
117: clearance angle 118; Concave portion
120: second mold 124: gas supply unit
126: gas inlet 128: protrusion
130: sealing unit

Claims (12)

A first mold part including an inner groove corresponding to a shape of a molding and a material inlet around the inner groove;
A second mold part coupled to the first mold part with a molding material therebetween; And
A gas supply part supplying gas to the groove through the second mold part to pressurize the molding material,
The material inlet is provided to space the molded material onto the material inlet, and includes an inclined surface that allows the molded material to be additionally drawn into the inner groove when molding the molded material.
A sealing unit disposed between the first mold part and the second mold part outside the material inlet part to seal the gas supplied from the gas supply part,
The sealing unit
A protrusion on any one of the first mold part and the second mold part; And
A recess formed on the other of the first mold portion and the second mold portion, the recess being coupled with the protrusion to allow further plastic flow of the molding,
Wherein the recess has a gentler slope than the protrusion in the lateral direction so as to have a margin between the protrusion and the protrusion,
Warm gas forming device. delete The warm gas forming apparatus of claim 1, wherein the inclined surface of the material inlet portion is formed to be inclined inward so that a separation distance between the molded material and the inclined surface increases toward the inner groove direction. The warm gas forming apparatus of claim 3, wherein an inclination angle of the inclined surface is in a range of 5 to 10 ° based on a horizontal surface of the first mold part. delete delete delete delete Preheating the workpiece;
Mounting the molded object in a mold including an inner groove corresponding to a shape of a molding to be formed from the molded material and a material inlet around the inner groove; And
Supplying a gas to the inner groove of the mold to press and shape the molded material into the inner groove while allowing the stretching of the shaped material from the material inlet into the inner groove,
The material inlet is provided to space the molded material onto the material inlet, and includes an inclined surface that allows the molded material to be additionally drawn into the inner groove in the forming step.
Sealing the first mold part and the second mold part through a sealing unit outside the material inlet part in the mounting step,
The sealing unit
A protrusion on any one of the first mold part and the second mold part; And
A recess formed on the other of the first mold portion and the second mold portion, the recess being coupled with the protrusion to allow further plastic flow of the molding,
Wherein the recess has a gentler slope than the protrusion in the lateral direction so as to have a margin between the protrusion and the protrusion,
Warm gas forming method. delete 10. The method of claim 9, wherein the molding material includes a tailored rolled blank having a variety of thicknesses, and in the mounting step, the tailored rolled blank has a thickness between the first mold part and the second mold part due to the clearance. Warm gas forming method, which is sealed regardless. 12. The method of claim 11, wherein the taylor rolled blank is used for an automotive center filler.
KR1020100097134A 2010-10-06 2010-10-06 hot blow forming apparatus, mold for hot blow forming and hot blow forming method KR101234741B1 (en)

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KR101234741B1 true KR101234741B1 (en) 2013-02-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015119421A1 (en) * 2014-02-07 2015-08-13 강대건 Method and apparatus for sheet hydroforming

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102329202B1 (en) * 2015-08-25 2021-11-22 주식회사 성우하이텍 Forming method of shock absorber housing for vehicle

Citations (4)

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Publication number Priority date Publication date Assignee Title
KR100231075B1 (en) * 1991-07-23 1999-12-01 로렌스 제이. 로어즈 Method of die forming metallic sheet materials
JP2001129618A (en) * 1999-10-28 2001-05-15 Honda Motor Co Ltd Superplastic forming die and method for superplastic forming
KR20020083222A (en) * 2001-04-26 2002-11-02 현대자동차주식회사 Hydro-forming system and method thereof
JP2010046673A (en) * 2008-08-19 2010-03-04 Sumitomo Light Metal Ind Ltd Method for manufacturing integrally-formed hollow article by hot blow-forming, mold and to-be-formed material used in the same method for manufacturing integrally-formed hollow article by hot blow-forming

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100231075B1 (en) * 1991-07-23 1999-12-01 로렌스 제이. 로어즈 Method of die forming metallic sheet materials
JP2001129618A (en) * 1999-10-28 2001-05-15 Honda Motor Co Ltd Superplastic forming die and method for superplastic forming
KR20020083222A (en) * 2001-04-26 2002-11-02 현대자동차주식회사 Hydro-forming system and method thereof
JP2010046673A (en) * 2008-08-19 2010-03-04 Sumitomo Light Metal Ind Ltd Method for manufacturing integrally-formed hollow article by hot blow-forming, mold and to-be-formed material used in the same method for manufacturing integrally-formed hollow article by hot blow-forming

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015119421A1 (en) * 2014-02-07 2015-08-13 강대건 Method and apparatus for sheet hydroforming
KR20150093407A (en) * 2014-02-07 2015-08-18 강대건 Method and Apparatus for Sheet Hydroforming
KR102174318B1 (en) * 2014-02-07 2020-11-04 강대건 Method and Apparatus for Sheet Hydroforming

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