JP2012051005A - Press molding device and method of manufacturing press molded product - Google Patents

Press molding device and method of manufacturing press molded product Download PDF

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Publication number
JP2012051005A
JP2012051005A JP2010195742A JP2010195742A JP2012051005A JP 2012051005 A JP2012051005 A JP 2012051005A JP 2010195742 A JP2010195742 A JP 2010195742A JP 2010195742 A JP2010195742 A JP 2010195742A JP 2012051005 A JP2012051005 A JP 2012051005A
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punch
press
pad
shoulder
molding
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JP2010195742A
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Japanese (ja)
Inventor
Masanobu Ichikawa
Nobuyuki Ichimaru
Masahiro Nakada
Toshiya Suzuki
Tomokichi Tokuda
匡浩 中田
信之 市丸
正信 市川
友吉 徳田
利哉 鈴木
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Sumitomo Metal Ind Ltd
Toyoda Iron Works Co Ltd
住友金属工業株式会社
豊田鉄工株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a press molding device and a method of manufacturing a press molded product for inexpensively manufacturing the press molded product having excellent dimension accuracy and high strength by a simple configuration.SOLUTION: The press molding device 10 includes a die 11 supporting a first pad 14 so as to enable entry/leaving in a clamping direction and a punch 12 storing a second pad 16 so as to enable entry/leaving in a clamping direction, and is used for manufacturing the press molded product 20 having a cross section including a bottom part formed along a punch upper face 12a, a wall part formed along a punch side face 12b and a shoulder round part formed along a punch shoulder part 12c. Welding pressure generated by a second pressing member 18 supporting the second pad 16 is set larger than that generated by a first pressing member 15 supporting the first pad 14. A distance in a direction parallel with the punch upper face 12a between a punch upper face round ending of the punch shoulder part 12c and the second pad 16 within a vertical face orthogonal to one direction is set to be 2-15 mm.

Description

  The present invention relates to a press molding apparatus and a method for manufacturing a press molded product, and more particularly, to a press molding apparatus and a method for manufacturing a press molded product that can suppress springback that occurs in the press molded product with a simple configuration.

  High-strength steel sheets are frequently used as components of automobile bodies in order to improve fuel efficiency for preventing global warming and to further improve safety in the event of a collision. For example, strength members and reinforcement members such as side sills and side members of automobile body components are designed with considerable restrictions such as preventing interference with other parts and securing a desired space. And often have complex shapes.

  However, the formability of the steel sheet decreases as the strength of the steel sheet increases. For this reason, when press molding is performed on a high-strength steel sheet to produce, for example, a side sill inner panel having a hat-shaped cross section, springback is likely to occur in the obtained press-molded product. When springback occurs, problems and yield reduction occur in subsequent processes (for example, welding processes). For this reason, suppression of the springback of the press-formed product which consists of a high strength steel plate is calculated | required strongly.

FIG. 14 is an explanatory view schematically showing a structural example of a general bending mold 1, and FIG. 15 is an explanatory view showing a spring back at a shoulder R portion of a steel plate.
As shown in FIGS. 14 and 15, a normal mold 1 (hereinafter referred to as “ordinary”, composed of a punch 2, a die 3, and an upper pad 5 embedded in the die 3 through a pressure member 4 so as to freely enter and exit. Bending of the steel plate 6 into a hat-shaped press-formed product 7 using a die is referred to as a lower pad in a punch instead of a die) is performed by pressing the upper pad 5 before forming. This is done by lowering the die 3 while restraining the portion corresponding to the bottom of the molded product 7. The bottom portion 7a of the hat-shaped press-formed product 7 is formed along the punch upper surface 2a of the punch 2, and the wall portion 7b is formed along the punch side surface 2b of the punch 2, and is also formed on the bottom portion 7a and the wall portion 7b. The continuous shoulder R portion 7 c is formed along the punch shoulder portion 2 c of the punch 2.

  In this way, the steel plate 6 is bent along the punch shoulder 2c, whereby tensile stress and compressive stress are generated on the front surface and the back surface of the steel plate 6. Then, when the tensile stress and the compressive stress are released by releasing the steel plate 6 from the mold 1, the shape of the steel plate 6 is changed as shown by the arrow in FIG. Springback occurs at the shoulder R portion 7c.

  In Patent Document 1, the spring back (the opening angle of the shoulder R portion) is adjusted by adjusting the stroke of the lower pad in a normal mold having a lower pad that is housed in a punch through a pressure member. A method is disclosed.

  In each of Patent Documents 2 to 4, the angle change amount (spring back amount) of a press-formed product is adjusted by a lower pad in a normal mold having a lower pad that is housed in a punch through a pressurizing member. A method is disclosed.

JP 2000-042635 A Japanese Patent No. 3572950 Japanese Utility Model Publication No. 63-13821 Japanese Utility Model Publication No. 3-057423

  In the methods disclosed in Patent Documents 1 to 4, the spring back cannot be sufficiently suppressed depending on the strength of the steel plate that is the molding material. In particular, in recent years, steel sheets having ultrahigh strength of 980 MPa or more, and in some cases 1180 MPa or more have come to be used for materials to be molded. In such a case, the spring back can be suppressed to a satisfactory level. Can not.

  FIG. 16 is an explanatory view schematically showing an example of the shape of a press-formed product 7 formed from the high-strength steel plate 6 by the mold disclosed in Patent Document 1. As shown in FIG. 16, since the high-strength steel plate 6 at the time of forming is formed along the upper surface 2a of the punch 2, the flatness of the bottom 7a of the press-formed product 7 is greatly collapsed, and the bottom 7a has a large curvature. Remains and cannot be formed into a desired shape.

  Therefore, when the punch 2 or die 3 of the molding die 1 for press-forming the high-strength steel plate 6 is manufactured, the shape of the press-formed product 7 obtained by press-forming the target steel plate 6 is actually formed. On the basis of the above, it is necessary to determine the optimum shape by trial and error by repeatedly performing fine correction (die adjustment) of the shape of the punch 2 and the die 3, and much man-hour and time are required for die adjustment.

Furthermore, when the strength of each of the many high-strength steel plates 6 used as the forming material is not sufficiently controlled and is not constant, the dimensions of the press-formed product 7 also vary due to the strength variation.
For this reason, it has been difficult to manufacture a high-strength press-formed product 7 with good dimensional accuracy at low cost by the conventional technique.

  The present invention solves these problems of the prior art, and manufactures a press-molding apparatus and press-molded product for producing a high-strength press-molded product having excellent dimensional accuracy at a low cost with a simple configuration. It aims to provide a method.

  The present inventors support a first pad that contacts one surface of a metal plate, which is a workpiece extending in one direction, instead of the above-described normal mold so as to freely enter and exit in the die moving direction. And a punch that accommodates the second pad that contacts the other surface of the metal plate so as to freely enter and exit in the mold clamping direction, and the metal plate is restrained from above and below by both the first pad and the second pad. When a metal plate (hereinafter referred to as “development die”) is used for bending or drawing a metal plate, the punch upper surface R stop of the punch shoulder in the vertical plane perpendicular to one direction, While variously changing the distance W between the two pads in the direction parallel to the upper surface of the punch and the stroke amount CSt of the second pad, the influence on the spring back of the press-formed product was examined in detail.

  As a result, when forming the metal plate while holding the metal plate between the first pad and the second pad until the end of forming the metal plate, the punch upper surface R of the punch shoulder and the bottom surface of the punch shoulder are stopped. By forming the shoulder R portion and the wall portion after forming while bending the metal plate so that there is a time when the portion between the pad does not contact the metal plate being formed, Knowing that the problems described above can be solved, the present invention has been completed.

  The present invention relates to a die that supports a first pad that is in contact with one surface of a metal plate, which is a workpiece extending in one direction, so as to freely enter and exit in the die moving direction, and the other surface of the metal plate. A punch for storing the second pad in contact with the punch in a mold clamping direction; a bottom formed along the punch upper surface of the punch; a wall formed along the punch side surface of the punch; A press molding apparatus for manufacturing a press molded product having a cross section formed along a shoulder portion and having a shoulder R portion that is continuous with a bottom portion and a wall portion, wherein the second processing unit supports a second pad. The pressing force generated by the pressing member is larger than the pressing force of the first pressing member that supports the first pad, and the punch upper surface R of the punch shoulder in the vertical plane orthogonal to the one direction. Stop and second pad are on the punch The direction parallel to the, to be present in a predetermined distance, a press-molding apparatus characterized by the presence in example 2~15mm apart.

  From another viewpoint, the present invention performs press molding on a metal plate using the press molding apparatus according to the present invention, and forms a bottom portion formed along the punch upper surface of the punch and along the punch side surface of the punch. A method for manufacturing a press-formed product having a cross section having a wall portion to be formed and a shoulder R portion formed along a punch shoulder portion of the punch and continuing to the bottom portion and the wall portion, It is a manufacturing method of the press-molded article characterized by including all the steps to the fourth step.

First step: The metal plate is sandwiched between the first pad and the second pad until the metal plate is completely formed.
Second step: Forming the metal plate is started by bringing the die and the punch close to each other.

  Third step: Continue forming the metal plate so that there is a time during which the portion of the punch upper surface between the punch upper surface R stop of the punch shoulder and the lower pad does not contact the metal plate being formed. To do.

Fourth step: The shoulder R portion and the wall portion are molded by molding at the bottom dead center after the third step.
In the present invention, the second pressure F2 is desirably 0.4 kN / mm or more per unit width in the one direction, and the first pressure F1 is per unit width in the one direction. It is desirable that it is 0.2 kN / mm or more.

  Precisely, the first pressure F1 is a pressure applied to the metal plate by the first pad, and the second pressure F2 is a pressure applied to the metal plate by the second pad. Since the weights of the first pad and the second pad are extremely smaller than the first pressure F1 and the second pressure F2, the first pressure F1 is generated by the first pressure member. The second pressurizing force F2 may be the pressurizing force generated by the second pressurizing member.

  Furthermore, it is desirable that the stroke CSt of the second pad in the mold clamping direction is 0.5 to 10 mm. If the stroke CSt is less than 0.5 mm, the spring back may not be suppressed to a sufficiently satisfactory level. On the other hand, if the stroke CSt exceeds 10 mm, the deflection of the metal plate being formed becomes excessive and the deflection is This is because it may remain excessively in the press-formed product.

  According to the present invention, even when the strength of the steel sheet as the material to be formed is 980 MPa or more, further 1180 MPa or more, for example, the spring back can be suppressed to a sufficiently satisfactory level. In addition, according to the present invention, the shape of the press-molded product including the flatness of the bottom can be reliably formed into a desired shape. Therefore, the man-hours and time required for fine correction (die adjustment) of the punch and die shapes can be greatly reduced.

  Therefore, according to the present invention, a high-strength press-molded product having a simple configuration and good dimensional accuracy can be manufactured at a low cost. For example, the weight reduction associated with the increase in strength of automobile parts can be achieved. This can significantly contribute to the improvement of automobile safety and the reduction of fuel consumption by reducing the weight of the vehicle body.

FIG. 1 is an explanatory view schematically showing a configuration of a press forming apparatus for bending forming according to the present invention. FIG. 2 is an explanatory view schematically showing a configuration of a press forming apparatus for drawing forming according to the present invention. FIG. 3 is an explanatory view schematically showing a configuration of a press forming apparatus with a cam mechanism for bending forming according to the present invention. FIG. 4A is an explanatory view schematically showing the forming state of the steel plate in the third step, and FIG. 4B is an explanatory view schematically showing the forming state of the steel plate in the fourth step. is there. FIG. 5 (a) is an explanatory view schematically showing the maximum principal stress distribution of the shoulder portion of the steel sheet at the bottom dead center of the conventional press forming using 980 MPa class super high tensile strength of 1.4t, by CAE analysis. FIG. 5B schematically shows the maximum principal stress distribution of the shoulder portion of the steel sheet at the bottom dead center of press forming when CSt = 3.5 mm of the present invention using the same material by CAE analysis. It is explanatory drawing shown. FIG. 6 is an explanatory view schematically showing a situation where the present invention is applied to two-step molding. FIG. 7A to FIG. 7H are explanatory views showing the applicable cross-sectional shapes of the press-formed product of the present invention. FIG. 8 is an explanatory diagram showing applicable shapes of the press-formed product of the present invention. FIG. 9 is an explanatory diagram showing a cross-sectional shape of a model part to be verified in this embodiment. FIG. 10 is an explanatory diagram showing a springback evaluation method. FIG. 11 is an explanatory diagram showing a method for evaluating the deflection of the shoulder. FIG. 12 is a graph showing a measurement result of the relationship between the stroke amount CSt of the second pad and the opening amount Wh. FIG. 13 is a graph showing a measurement result of the relationship between the tensile strength of the steel sheet and the opening amount Wh. FIG. 14 is an explanatory view schematically showing a structural example of a general bending mold. FIG. 15 is an explanatory view showing a springback phenomenon in the shoulder R portion of the steel plate. FIG. 16 is an explanatory view schematically showing an example of the shape of a press-formed product formed from a high-strength steel plate using a normal mold.

  The present invention will be described below with reference to the accompanying drawings. In the following description, the case where the metal plate as the workpiece is a steel plate having a tensile strength of 980 MPa or more is taken as an example.

1. FIG. 1 is an explanatory view schematically showing a configuration of a press forming apparatus 10 for bending forming according to the present invention, and FIG. 2 is a press for drawing forming according to the present invention. It is explanatory drawing which shows the structure of the shaping | molding apparatus 10-1 typically. As shown in FIGS. 1 and 2, the present invention can be applied not only to bending forming but also to drawing forming. The difference between the press forming apparatuses 10 and 10-1 is that a blank holder 9 for performing drawing forming is used. Therefore, the following description will be given with respect to the press forming apparatus 10, and the description of the press forming apparatus 10-1 will be omitted as appropriate by attaching the same reference numerals to the same elements.

The press molding apparatus 10 includes a die 11 and a punch 12. The press forming apparatus 10 performs press forming on the steel plate 13 extending in one direction (a direction orthogonal to the paper surface of FIG. 1).
The die 11 supports the first pad 14 so as to freely enter and exit in the moving direction of the die 11. The first pad 14 is supported by a first pressure member 15 (which uses a winding spring in the present embodiment) mounted on the first pad 14. The first pressing member 15 presses the first pad 14 against the steel plate 13 with a pressing force (spring force) F1. As a result, the first pad 14 comes into contact with one surface 13 a of the steel plate 13.

  The punch 12 stores the second pad 16 in a storage portion 17 formed in a concave shape in the punch 12 so as to freely enter and exit in the mold clamping direction. The second pad 16 is supported by a second pressure member 18 (which uses a winding spring in the present embodiment) attached to the bottom of the storage portion 17. The second pressure member 18 presses the second pad 16 against the steel plate 13 with the applied pressure F2. As a result, the second pad 16 comes into contact with the other surface 13 b of the steel plate 13.

  As shown in the enlarged view in FIG. 1, between the punch upper surface R stop 19 of the punch shoulder 12 c and the second pad 16 in a vertical plane orthogonal to one direction which is the extending direction of the steel plate 13. The distance W in the direction parallel to the punch upper surface 12a is 2 mm or more and 15 mm or less.

  If the distance W is greater than 15 mm, a shape defect at the bottom of the press-formed product 20 occurs, and the set extra line length L becomes longer and the second pad 16 is necessary as will be described later with reference to FIG. A large stroke CSt must be set. On the other hand, if the distance W is less than 2 mm, the strength of the punch shoulder 12c of the punch 12 is insufficient, and the punch 12 may be damaged by pressurization at the bottom dead center of molding. For this reason, the distance W is 2 mm or more and 15 mm or less. The lower limit value of the distance W is preferably 3 mm or more in order to stably secure the set extra line length L, and more preferably 5 mm or more in order to suppress damage to the mold. The upper limit value of the distance W is preferably 13 mm, and more preferably 10 mm.

  If the pressing force F1 of the first pad 14 is too high, the second pad 16 may stroke downward during molding, and the shape freezing effect intended by the present invention may not be obtained. For this reason, the pressure F2 generated by the second pressure member 18 that supports the second pad 16 is larger than the pressure F1 of the first pressure member 15 that supports the first pad 14. That is, F2-F1> 0. (F2-F1) / F1> 1.2 is desirable, and (F2-F1) / F1> 2 is more desirable.

The second pressure F2 is preferably 0.4 kN / mm or more per unit width in one direction, and the first pressure F1 is 0.2 kN / mm or more per unit width in the one direction. It is desirable to be. Furthermore, it is desirable that the stroke CSt of the second pad in the mold clamping direction is 0.5 to 10 mm. If the stroke CSt is less than 0.5 mm, the spring back may not be suppressed to a sufficiently satisfactory level. On the other hand, if the stroke CSt exceeds 10 mm, the deflection of the metal plate being formed becomes excessive and the deflection is There is a risk of excessive remaining in the press-formed product. As shown in FIG. 1, the steel plate 13 is press-formed into the formed product 20. As shown in FIG. 5, the molded product 20 includes a bottom portion 20a, a wall portion 20b, and a shoulder R portion 20c continuous to the bottom portion 20a and the wall portion 20b. The steel plate 13 is press-formed by the die 11 and the punch 12 into a press-formed product 20 having a cross section having a bottom portion 20a, a wall portion 20b, and a shoulder R portion 20c.

  The bottom portion 20 a is formed along the punch upper surface 12 a of the punch 12. The wall portion 20 b is formed along the punch side surface 12 b of the punch 12. Further, the shoulder R portion 20 c is formed along the punch shoulder portion 12 c of the punch 12.

FIG. 3 is an explanatory diagram schematically showing a configuration of a press molding apparatus 10-2 with a cam mechanism for bending molding according to the present invention.
As shown in FIG. 3, by incorporating the cam mechanism 21 into the die 11 and the punch 12, the side wall portion of the movable die 22 approaches the punch 12 obliquely toward the bottom dead center. Thereby, in addition to the spring back of the shoulder R part 20c, the curvature of the wall part 20b is also suppressed. The oblique direction driving of the movable die 22 is not necessarily limited to the cam mechanism 21. For example, a hydraulic cylinder for oblique direction driving may be incorporated in the mold separately from the main slide of the press machine.

  The press molding apparatuses 10, 10-1, and 10-2 may be hydraulic press machines, mechanical press machines, or mechanical servo press machines. In the present invention, since it is necessary to perform the cushion stroke with high accuracy, it is desirable to use a servo press machine with high operational accuracy.

  In the above description, the case of using a winding spring as the first pressure member 15 and the second pressure member 18 is taken as an example, but the first pressure member 15 and the second pressure member 18 are It is not limited to a spring such as a winding spring, and a reaction force generating mechanism such as a gas-filled hydraulic cylinder can be used. However, the reaction force generation mechanism needs to be set to generate an initial reaction force.

  Further, as the second pressurizing member 18 that supports the second pad 16, a cylinder connected to a hydraulic source or an air pressure source, an electric cylinder driven by a motor, or the like is used, and the second pad 16 is actively operated. You may do it.

2. Method for Producing Press-Molded Product According to the production method according to the present invention, the steel sheet 13 is press-formed using the press-forming device 10, and the cross section having the bottom portion 20a, the wall portion 20b, and the shoulder R portion 20c described above is obtained. The press-formed product 20 provided is manufactured. The present invention includes the following first to fourth steps.

  In the first step, the steel plate 13 is held between the first pad 14 and the second pad 16 until the forming of the steel plate 13 is completed. In the first step, the portion corresponding to the bottom portion 20a of the press-formed product 20 is restrained by the first pad 14 and the second pad 16 until the end of forming, so even when the steel plate 13 is a high-strength steel plate. The shape collapse of the bottom 20a of the press-formed product 20 is prevented.

In the second step, the forming of the steel sheet 13 is started by lowering the die 11 and bringing the die 11 and the punch 12 close to each other.
FIG. 4A is an explanatory view schematically showing the forming state of the steel sheet 13 in the third step, and FIG. 4B is an explanatory view schematically showing the forming state of the steel plate 13 in the fourth step. FIG.

  As shown in FIG. 4A, in the third step, the portion 23 between the punch upper surface R stop 19 of the punch shoulder portion and the lower pad 16 in the punch upper surface does not contact the steel plate 13 being formed. The forming of the steel plate 13 is continued so that time exists.

  That is, the pressure F2 generated by the second pressure member 18 that supports the second pad 16 is greater than the pressure F1 of the first pressure member 15 that supports the first pad 14, The second pad 16 maintains the state of protruding upward from the upper surface 12a of the punch 12 even after the die 11 starts to descend in the second step and the forming of the steel plate 13 starts. For this reason, even when the steel plate 13 is formed in the third step, the portion 23 between the punch upper surface R stop 19 of the punch shoulder portion and the lower pad 16 in the upper surface of the punch does not contact the steel plate 13 being formed. Exists.

  Under the present circumstances, the steel plate 13 which exists in the vicinity of the part 23 mentioned above among the punch upper surfaces 12a exists in the state bent partially. That is, by providing the second pad 16 with an appropriate stroke amount CSt during molding by the third step, a margin length is generated in the vicinity of the portion corresponding to the shoulder R portion 20c of the press-molded product 20. .

As shown in FIG. 4A, the length L of the extra line length is obtained as L≈√ (CSt 2 + W 2 ) −W.
In the fourth step, as shown in FIG. 4B, the shoulder R portion 20c and the wall portion 20b of the press-formed product 20 are formed by molding at the bottom dead center after the third step. Molding is performed to produce a press-molded product 20.

  FIG. 5 (a) schematically shows the maximum principal stress distribution of the shoulder R portion of the press-formed product at the bottom dead center of the conventional press-forming using 1.4t 980 MPa class super high tensile strength by CAE analysis. FIG. 5 (b) is a shoulder R portion 20c of the press-formed product 20 at the bottom dead center of the press-forming of the present invention condition CSt = 3.5 mm using 1.4t 980 MPa class super high tensile strength. It is explanatory drawing which shows typically the largest principal stress distribution of by CAE analysis. In FIGS. 5A and 5B, a symbol + surrounded by a circle indicates a tensile stress, and a symbol − surrounded by a circle indicates a compressive stress.

  As shown in FIG. 5A, at the bottom dead center of the conventional press forming, the portion 20c corresponding to the punch shoulder R portion 12c has a compressive stress on the back side of the steel plate 13 and a tensile stress on the front side. Since the press-molded product 20 springs back toward the outer side of the cross-section, as a result, the shoulder R portion 20c generates a spring-back that greatly opens outward, resulting in the press-molded product 20 having an excessive spring-back over the entire cross-section. .

  On the other hand, as shown in FIG. 5 (b), in the fourth step of the present invention, the extra line length portion of the length L generated by the third step is crushed at the bottom dead center. The extra line length portion of the punch shoulder R portion 20c of the molded product is pushed out toward the wall portion 20b. And the extra line length part of the punch shoulder R part 20c of a molded product is extruded to the wall part 20b and undergoes bending and unbending deformation, but the tensile stress and the compressive stress are alternately on the front side and the back side of the steel plate 13. As a result, the shoulder R portion 20c cancels out with the spring back that opens outward, and the press-formed product 20 having an appropriate spring back in the entire cross section is obtained.

  In the fourth step, as shown in FIG. 5B, the stress of the steel plate 13 at the bottom dead center is offset (balanced) with respect to the direction of change in the springback. Even if the tensile strength TS of the steel plate 13 varies, the state in which the stress is balanced is maintained. Thereby, even if it is a case where the intensity | strength of each of many high strength steel plates 13 used as a shaping | molding material is not fully managed and is not constant, the springback amount of the press-formed product 20 becomes constant.

  As described above, in the fourth step, in order to reliably prevent the second pad 16 from descending before reaching the vicinity of the bottom dead center, the second process for supporting the second pad 16 is performed. It is effective that the spring force (initial pressure) F2 of the winding spring which is the pressure member 18 is sufficiently high, for example, 0.4 kN / mm or more per unit width in one direction which is the extending direction of the steel plate. It is desirable.

  Further, in the fourth step, if the restraint of the first pad 14 is weak, the steel plate 13 in the portion corresponding to the bottom 20a of the press-formed product 20 is lifted, so that the pressure applied to the first pad 14 (initial pressure) ) Is sufficiently high. For example, it is desirable that it is 0.2 kN / mm or more per unit width in the longitudinal direction of the press-formed product 20.

FIG. 6 is an explanatory view schematically showing a situation where the present invention is applied to two-step molding.
The above description with reference to FIGS. 4 and 5 is a case where the press-formed product 20 having a hat cross section is formed in a single step, but unlike this, as shown in FIG. The present invention is also applied to a two-step molding in which drawing is performed shallowly and bending is performed in a bending process.

FIG. 7A to FIG. 7H are explanatory views showing the applicable cross-sectional shapes of the press-formed product of the present invention.
The press-formed product of the present invention has a hat cross section shown in FIG. 7 (a), a slant wall hat cross section shown in FIG. 7 (b), a hat cross section with a bottom shape shown in FIG. 7 (e), or FIG. A press-formed product having a substantially hat section such as a stepped hat section of the vertical wall shown in FIG. 7 or a substantially U-shape such as a U-shaped section illustrated in FIG. A press-formed product having a cross-section, and further a press having a cross-section having a hat cross-section with different heights on the left and right walls shown in FIG. Applicable to molded products.

  That is, as shown in FIGS. 7 (b) and 7 (d), the present invention can be applied even if the vertical wall portion is inclined, as shown in FIGS. 7 (g) and 7 (h). Even if there is a difference in the height of the wall, it is applicable.

FIG. 8 is an explanatory diagram showing applicable shapes of the press-formed product 20-1 of the present invention.
This press-molded product 20-1 is applicable even if it has a curvature in the vertical direction and / or the horizontal direction in the longitudinal direction (cross-sectional orthogonal direction) of the part.

The present invention will be described more specifically with reference to examples.
In this example, the effect of the present invention was verified using the press molding apparatus 10 of the present invention shown in FIG.

FIG. 9 is an explanatory diagram showing a cross-sectional shape of a model part to be verified in this embodiment.
In this test, the molding die shown in FIG. 3 was used. The width W of the punch 12 of the molding die was 80 mm, and the height was 60 mm. The depth of the molding die was 80 mm. The radius of curvature of the inner surface of the shoulder R portion of the press-formed product 20 was 5 mm at the punch shoulder equivalent portion and 3.6 mm at the die shoulder equivalent portion.

Then, press molding was performed under the test conditions listed below.
(Test conditions)
(A) Press equipment: 2500 kN hydraulic press machine (b) Workpiece: 980 MPa class high strength steel sheet (1.4 mm thick, for confirmation of stroke CSt), 590 MPa, 780 MPa, 980 MPa, 1180 MPa class high strength steel sheet (Thickness of 1.4mm, for confirmation of steel sheet strength variation reduction effect)
(C) Blank shape: 70 × 200 mm rectangle (d) Molding speed: 10 mm / min.
(E) Length W (distance from punch shoulder R stop to lower pad division): 4 levels of 5, 10, 15, 20 mm (15 mm is standard condition)
(F) Pressure applied to the second pad 16: 200 kN
(G) Pressure applied to the first pad 14: 40 kN
(H) Bottom dead center pressure: 700 kN
(I) Lubrication: Secured by applying a general anti-rust oil to the steel sheet.

  The obtained press-molded product was measured and evaluated for the spring back and the shoulder R deflection by the evaluation method described below.

(Springback)
FIG. 10 is an explanatory diagram showing a springback evaluation method.
As shown in FIG. 10, the spring back was evaluated by measuring the opening amount Wh of a portion 30 mm below the bottom of the punch.

(Deflection of shoulder R)
FIG. 11 is an explanatory diagram showing a method for evaluating the deflection of the shoulder R portion.
As shown in FIG. 11, the deflection of the shoulder R portion was evaluated by measuring the deflection amount U of the shoulder R portion in the example in order to define the value of the length W.

FIG. 12 is a graph showing the measurement result of the relationship between the stroke amount CSt of the second pad and the opening amount Wh, and FIG. 13 is a graph showing the measurement result of the relationship between the tensile strength of the steel sheet and the opening amount Wh. is there.
As shown in the graph of FIG. 12, it can be seen from the result of the test (980 MPa material) in which the stroke CSt is changed under the condition of W = 10 mm that an appropriate opening amount Wh can be obtained by changing the stroke CSt.

  In addition, as shown in the graph of FIG. 13, compared to the conventional molding method, the material strength is higher than the conventional molding method based on the result of molding 590 to 1180 MPa under the appropriate condition of the stroke CSt (3.5 mm). It can be seen that an opening Wh that is almost appropriate for the change can be obtained.

  Further, Table 1 summarizes the results of examining the amount of deflection by changing the W level in press molding of a 980 MPa material.

  As shown in Table 1, when W exceeds 15 mm, the deflection amount exceeds ± 0.5 mm, which is a general component accuracy tolerance.

DESCRIPTION OF SYMBOLS 1 Bending metal mold | die 2 Punch 2a Upper surface 2b Side surface 2c Punch shoulder part 3 Die 4 Pressing member 5 Upper pad 6 Steel plate 7 Press molded product 7a Bottom part 7b Wall part 7c Shoulder R part 9 Blank holder 10, 10-1, 10- 2 Press forming device 11 Die 12 Punch 12a Upper surface 12b Wall 12c Punch shoulder 13 Steel plate 13a One surface 13b The other surface 14 First pad 15 First pressurizing member 16 Second pad 17 Storage unit 18 Second Pressing member 19 Punch upper surface R Stop 20, 20-1 Press-formed product 20a Bottom portion 20b Wall portion 20c Shoulder R portion 21 Cam mechanism 22 Movable die 23 portion

Claims (3)

  1. A die that supports a first pad that is in contact with one surface of a metal plate that is a workpiece extending in one direction so as to be freely movable in and out of the die moving direction; and a second that is in contact with the other surface of the metal plate. A punch for receiving and retracting the pad in the mold clamping direction, a bottom portion formed along the punch upper surface of the punch, a wall portion formed along the punch side surface of the punch, and the punch A press molding apparatus for manufacturing a press molded product having a cross section formed along a punch shoulder and having a shoulder R portion continuous with the bottom and the wall,
    The applied pressure generated by the second pressure member that supports the second pad is greater than the applied pressure of the first pressure member that supports the first pad, and is orthogonal to the one direction. The press forming apparatus characterized in that the punch upper surface R stop of the punch shoulder portion and the second pad in the vertical plane are spaced apart by a predetermined distance in a direction parallel to the punch upper surface.
  2.   The press molding apparatus according to claim 1, wherein the predetermined distance is 2 to 15 mm.
  3. 3. Press forming the metal plate using the press forming apparatus according to claim 1 or 2 to form a bottom portion formed along a punch upper surface of the punch and a punch side surface of the punch. And a method of manufacturing a press-formed product having a cross section formed along a punch shoulder portion of the punch and having a shoulder R portion that is continuous with the bottom portion and the wall portion. A method for producing a press-formed product comprising the first step to the following fourth step;
    1st process: The said metal plate is clamped by the said 1st pad and the said 2nd pad until completion | finish of shaping | molding of this metal plate.
    Second step: Forming the metal plate is started by bringing the die and the punch close to each other.
    Third step: In the upper surface of the punch, the portion between the punch upper surface R stop of the punch shoulder and the lower pad exists such that there is a time during which the metal plate being formed is not in contact with the metal. Continue forming the plate.
    Fourth step: The shoulder R portion and the wall portion are molded by molding at the bottom dead center after the third step.
JP2010195742A 2010-09-01 2010-09-01 Press molding device and method of manufacturing press molded product Pending JP2012051005A (en)

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