JP2012236199A - Positioning structure of workpiece to be pressed and press working apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform high-accuracy press working by allowing positioning of a plate-like workpiece to be pressed to a press die when performing hot press working of the workpiece.SOLUTION: This positioning structure Y of the workpiece to be pressed for positioning the heated plate-like workpiece to be pressed to the press die 20 includes: positioning pins 22 provided in the press die 20, and inserted through positioning holes formed in the workpiece to be pressed; and swing suppression members 23, 24 provided around a forming face 20a of the press die 20, for contacting with a peripheral part of the workpiece W to be pressed to suppress swing of the workpiece W to be pressed, and performing the positioning before the press working.

Description

  The present invention relates to a positioning structure and a pressing apparatus for positioning a workpiece to be pressed such as a steel plate.

  2. Description of the Related Art Conventionally, as a press working device for so-called hot pressing, in which a workpiece to be pressed is heated to perform press working, a press die having first and second positioning pins is known (for example, , See Patent Document 1). The first positioning pin is disposed so as to correspond to the vicinity of the center portion of the workpiece to be pressed, and the second positioning pin is positioned so as to correspond to a portion closer to the end than the center portion of the workpiece to be pressed. ing. On the other hand, a first positioning hole through which the first positioning pin is inserted and a second positioning hole through which the second positioning pin is inserted are formed in the workpiece.

  Then, when the heated workpiece to be pressed is set in the press die, the first and second positioning pins are inserted into the first and second positioning holes to position the workpiece to be pressed with respect to the press die. This makes it difficult for the workpiece to be pressed to be displaced with respect to the press mold during the pressing.

Japanese Patent No. 4555839

  By the way, in order to perform highly accurate press work, it is necessary to improve the positioning accuracy of the workpiece to be pressed. In order to realize this, for example, there is a method of reducing the difference between the outer diameter of the positioning pin of the press mold and the inner diameter of the positioning hole of the workpiece.

  However, in hot pressing, the temperature of the pressed workpiece decreases as time passes, and the pressed workpiece contracts. Therefore, if the difference between the outer diameter of the positioning pin and the inner diameter of the positioning hole is extremely small, the size of the positioning hole increases due to thermal expansion at high temperatures when the workpiece is set in the press die. Even if the pin can be inserted, it is conceivable that the workpiece to be pressed bites into the positioning pin when the temperature decreases after pressing and the positioning hole becomes small. Therefore, in the case of hot pressing, there is a limit to reducing the difference between the outer diameter of the positioning pin and the inner diameter of the positioning hole. A gap must be ensured between them, and accurate initial positioning may not be performed.

  In the case of a plate-shaped workpiece, when placed on the press die after leaving the heating furnace, it shakes on the press die due to the impact at that time, and high-precision positioning cannot be performed. There is.

  The present invention has been made in view of the above points, and the object of the present invention is to enable high-precision positioning with respect to a press die when hot pressing a plate-like workpiece. Therefore, it is to perform highly accurate press working.

  In order to achieve the above object, in the present invention, a vibration suppressing portion is provided around the molding surface of the press mold so as to suppress the vibration of the workpiece to be pressed and to perform positioning before pressing.

  A first aspect of the present invention is a positioning structure for a workpiece to be pressed for positioning a heated plate-like workpiece to be pressed on a hot press die, provided in the press die, and Positioning pins that are inserted into positioning holes formed in the workpiece, and are provided around the molding surface of the press mold, and contact with the peripheral portion of the workpiece to be pressed to suppress the deflection of the workpiece to be pressed. And a runout suppressing portion for positioning the workpiece to be pressed before pressing.

  According to this configuration, when the workpiece to be pressed is set in the press die, the positioning pin of the press die is inserted into the positioning hole of the workpiece to be pressed. In this state, since the shake suppressing portion is in contact with the peripheral portion of the pressed workpiece, the shake of the pressed workpiece is suppressed. Furthermore, the pre-press positioning of the workpiece to be pressed is performed by the shake suppressing portion that is in contact with the peripheral edge portion of the press processed portion. At this time, since the vibration suppression part is in contact with the peripheral part of the workpiece to be pressed, it can be positioned with high accuracy by arranging the vibration suppression part to match the size of the workpiece to be thermally expanded after heating. Even then, since the workpiece to be pressed is press-molded and escapes from the shake suppressing portion, the pressed workpiece and the shake suppressing portion do not interfere strongly.

  In addition, since the work piece to be pressed is positioned by the positioning pin during the press work, the positional deviation during the press work is also suppressed.

  According to a second invention, in the first invention, the first and second runout suppressing portions are arranged so as to sandwich the workpiece to be pressed placed on the press die in a plan view. Is.

  According to this configuration, the workpiece to be pressed is positioned between the first and second shake suppressing portions, so that the workpiece to be pressed can be positioned with higher accuracy. Furthermore, it is possible to simultaneously perform steadying at a plurality of locations away from each other of the workpiece.

  According to a third aspect of the present invention, in the first or second aspect, the runout suppression portion protrudes upward from the periphery of the molding surface provided on the upper surface of the press mold, and the workpiece to be pressed is disposed above the runout suppression portion. A guide portion is provided for guiding the workpiece to be pressed to the molding surface when the workpiece is placed on the molding surface, and the lower portion of the guide portion of the deflection suppressing portion is in contact with the workpiece to be pressed. It is a feature.

  According to this configuration, when the workpiece to be pressed is placed on the molding surface of the press mold, the workpiece to be pressed is guided to the molding surface by the guide portion of the shake suppressing portion. Thereafter, the shake suppression unit comes into contact with the workpiece to be pressed to suppress the deflection of the workpiece to be pressed, and the workpiece to be pressed is positioned.

  4th invention is a press processing apparatus for hot-pressing the heated plate-shaped to-be-processed workpiece, It is provided in the press die which has a molding surface, and the said press die, The said to-be-pressed workpiece A positioning pin that is inserted into a positioning hole formed on the pressing die, and is provided around a molding surface of the press die, and contacts with a peripheral portion of the pressed workpiece to suppress deflection of the pressed workpiece, The apparatus includes a vibration suppression unit for positioning the workpiece to be pressed before pressing.

  According to this configuration, as with the first aspect of the invention, since the positioning pin and the deflection suppressing portion are provided, positioning can be performed while suppressing deflection of the workpiece to be pressed before pressing, and also during pressing It is also possible to suppress displacement of the pressed workpiece.

  According to the first aspect of the invention, since the shake suppressing portion that contacts the peripheral portion of the workpiece to be pressed is provided around the molding surface of the press mold to perform positioning before pressing, While suppressing the shake of a to-be-pressed work piece, highly accurate positioning can be performed. And it can position with a positioning pin during press work. Therefore, highly accurate press work can be performed.

  According to the second aspect of the invention, the first and second shake suppressing portions are arranged so as to sandwich the workpiece to be pressed, so that press processing with higher accuracy can be performed.

  According to the third aspect of the invention, the guide part for guiding the workpiece to be pressed to the molding surface of the press mold is provided on the upper side of the deflection suppressing portion, so that the workpiece to be pressed is set on the press mold. It can be done smoothly.

  According to the fourth invention, high-precision press working can be performed as in the first invention.

It is a side view of a press work apparatus. It is a front view of a lower mold. It is a top view of a lower mold. FIG. 2 is a view corresponding to FIG. 1 in a state where a workpiece to be pressed is set. FIG. 3 is a view corresponding to FIG. 2 in a state where a workpiece to be pressed is set. FIG. 4 is a view corresponding to FIG. 3 in a state where a workpiece to be pressed is set.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a press working apparatus 1 according to an embodiment of the present invention. The press working apparatus 1 is an apparatus for performing hot press work on a plate-shaped workpiece W (shown in FIGS. 4 to 6), and is installed, for example, at a manufacturing site for automobile parts.

  The press working apparatus 1 includes an upper die 10, a lower die (press die) 20, and a die driving device 30 that drives the upper die 10. The lower mold 20 is fixed to the ground via a fixed plate (not shown). The upper mold 10 is disposed so as to face directly above the lower mold 20 and can move in the vertical direction (direction in which the lower mold 20 is in contact with or separated from the lower mold 20).

  On the upper surface of the lower mold 20, a molding surface 20 a for molding the workpiece W to be pressed is formed. In the present embodiment, a case will be described in which an elongated flat pressed workpiece W is press-molded so as to be a final product having a hat-shaped cross section. Therefore, the molding surface 20a has a convex shape that bulges upward from the upper surface of the lower mold 20 so that a hat-shaped cross section can be molded. Moreover, as shown in FIG. 2, the height of the molding surface 20a is highest at the portion corresponding to the central portion in the longitudinal direction of the workpiece W and approaches the portion corresponding to the end in the longitudinal direction. It is set to be low. This is set according to the shape of the final product.

  A center positioning pin 21 is provided at the center in the longitudinal direction of the molding surface 20a of the lower mold 20 so as to protrude upward, and end positioning pins 22 and 22 are respectively provided in the vicinity of both ends in the longitudinal direction of the molding surface 20a. It is provided so that it may protrude. The center positioning pin 21 and the end positioning pins 22 and 22 have a cylindrical shape and extend substantially vertically. Further, tapered portions 21a and 22a that are reduced in diameter toward the upper end are formed on the center and the upper portions of the end positioning pins 21 and 22, respectively. The length of the end positioning pin 22 is set longer than that of the center positioning pin 21, and the upper ends of the center and the end positioning pins 21 and 22 are located at substantially the same height.

  As shown in FIG. 3, around the molding surface 20 a on the upper surface of the lower mold 20, the periphery of the workpiece to be pressed W is brought into contact with the peripheral portion of the workpiece to be pressed W and the deflection of the workpiece to be pressed W is suppressed. First to fourth runout suppression members (runout suppression units) 23 to 26 for performing positioning before pressing of W are provided.

  The first runout suppression member 23 is located on one side in the longitudinal direction of the molding surface 20a (right side in FIG. 3) on one side in the width direction of the molding surface 20a (lower side in FIG. 3). Further, the second shake suppressing member 24 is located on the other side in the width direction of the molding surface 20a (upper side in FIG. 3) on one side in the longitudinal direction of the molding surface 20a. Further, the third shake suppressing member 25 is located on one side in the width direction of the molding surface 20a on the other side in the longitudinal direction of the molding surface 20a (left side in FIG. 3). Further, the fourth shake suppressing member 26 is located on the other side in the width direction of the molding surface 20a on the other side in the longitudinal direction of the molding surface 20a.

  That is, as shown in FIG. 6, the first runout suppression member 23 and the second runout suppression member 24 have the width of the workpiece to be pressed W in the plan view of the workpiece to be pressed W placed on the molding surface 20 a. The third shake suppressing member 25 and the fourth shake suppressing member 26 are also arranged so as to sandwich the workpiece W to be pressed.

  The first to fourth shake suppressing members 23 to 26 are each configured by a member that protrudes upward from the upper surface of the lower mold 20. The protrusion heights from the upper surface of the lower mold 20 of the respective shake suppression members 23 to 26 are the same, and as shown in FIGS. 1 and 2, the upper ends of the respective shake suppression members 23 to 26 are the positioning pins 21 and 22. It is set to be located above the upper end of the.

  The first runout suppression member 23 is provided with a guide surface (guide portion) 23a for guiding the workpiece W to be placed on the molding surface 20a when the workpiece W is placed on the molding surface 20a. That is, the upper side of the side surface 23b that faces the molding surface 20a in the first shake suppressing member 23 is configured by an inclined surface that extends and inclines in a direction away from the molding surface 20a as it approaches the upper end, and this inclined surface is a guide surface. 23a. The upper part of the guide surface 23 a is located above the positioning pins 21 and 22.

  As shown in FIG. 1, a lower side than the guide surface 23 a on the side surface 23 b of the first shake suppressing member 23 is a contact surface 23 c that contacts the peripheral edge of the workpiece W to be pressed. The upper edge portion of the contact surface 23c is continuous with the lower edge portion of the guide surface 23a. The contact surface 23c extends downward substantially vertically. And when the contact surface 23c contacts the peripheral part of the to-be-pressed work W in the state expanded and heated to the temperature suitable for a hot press, the to-be-pressed work W is previously made on the molding surface 20a. It is formed so as to be a predetermined position.

  Similarly, on the side surface 24b facing the molding surface 20a of the second shake suppressing member 24, a guide surface 24a extending obliquely in a direction away from the molding surface 20a toward the upper end, and a lower edge portion of the guide surface 24a And a contact surface 24c for extending the workpiece W to a predetermined position on the molding surface 20a.

  Moreover, as shown in FIG. 3, the guide surface 25a and the contact surface 25c are similarly formed in the side surface 25b facing the shaping | molding surface 20a in the 3rd shake suppression member 25. As shown in FIG.

  Further, similarly, a guide surface 26a and a contact surface 26c are formed on the side surface 26b of the fourth shake suppressing member 26 that faces the molding surface 20a.

  The positioning structure Y of the workpiece W according to the present invention includes the center and end positioning pins 21 and 22 and the first to fourth shake suppressing members 23 to 26.

  As shown in FIG. 1, a concave molding surface 10 a corresponding to the molding surface 20 a of the lower mold 20 is formed on the lower surface of the upper mold 10. The molding surface 10a is formed with relief holes 10b for the center and end positioning pins 21 and 22 (shown only in FIGS. 1 and 4).

  The mold driving device 30 includes a movable platen 31 to which the upper die 10 is attached and a hydraulic cylinder 32 connected to the movable platen 31 and is controlled by a control device (not shown).

  The workpiece to be pressed W is specifically a steel plate, and as shown in FIG. 6, a central positioning hole W1 through which the central positioning pin 21 is inserted is formed in the central portion in the longitudinal direction, and in the vicinity of both ends in the longitudinal direction. Are formed with end positioning holes W2, W2 through which the end positioning pins 22, 22 are inserted, respectively. The center positioning hole W1 has a circular shape that is substantially similar to the cross-sectional shape of the center positioning pin 21. The inner diameter of the central positioning hole W1 is set to be larger than the outer diameter of the central positioning pin 21 in a state where the inner diameter is heated to a temperature suitable for hot pressing. This is to prevent the pressed workpiece W from biting into the central positioning pin 21 even when the pressed workpiece W is cooled during molding and the inner diameter of the central positioning hole W1 becomes smaller due to thermal contraction.

  The end positioning hole W2 is an oval shape that is long in the longitudinal direction of the workpiece W to be pressed. The dimension in the minor axis direction of the end positioning hole W2 is set longer than the outer diameter of the end positioning pin 22. This is based on the same reason as described above for enlarging the central positioning hole W1. The dimension in the major axis direction of the end positioning hole W2 is set to be significantly longer than the dimension in the minor axis direction. This is because the shrinkage dimension in the longitudinal direction of the workpiece W is larger than the shrinkage dimension in the width direction due to thermal shrinkage.

  Next, the case where the to-be-pressed workpiece W is processed using the press processing apparatus 1 configured as described above will be described. The workpiece W to be pressed is heated to a temperature suitable for hot pressing with a heating furnace or the like before being set in the press processing apparatus 1.

  Then, after the workpiece W to be pressed is transported to above the lower mold 20 by a transport device (not shown) or the like, it is placed on the molding surface 20 a of the lower mold 20. At this time, when the position of the workpiece to be pressed W is slightly shifted in the width direction with respect to the molding surface 20a in plan view, the peripheral portion of the workpiece to be pressed W is the first to fourth vibration suppressing members 23 to 26. Any one of the guide surfaces 23a to 26a is contacted, and the workpiece W is guided to a predetermined position by the guide surfaces. Then, as shown in FIGS. 4 and 5, the center positioning pin 21 of the lower mold 20 is inserted into the center positioning hole W1 of the workpiece W and the end positioning pins 22 and 22 of the lower mold 20 are covered. It is inserted into the end positioning holes W2, W2 of the press work W.

  At this time, in a state in which the workpiece to be pressed W is placed on the molding surface 20a, the workpiece to be pressed W is sandwiched between the first and second runout suppressing members 23 and 24, and the third and fourth runout suppressing members. Since the workpiece to be pressed W is sandwiched between 25 and 26, the workpiece to be pressed W is positioned with high accuracy.

  Since the workpiece to be pressed W is in a heated state, the peripheral portion of the workpiece to be pressed W comes into contact with the contact surfaces 23c to 26c of the first to fourth shake suppressing members 23 to 26. Thereby, the vibration of the workpiece W which is vibrated by an impact or the like placed on the molding surface 20a is suppressed. At this time, since the first to fourth shake suppressing members 23 to 26 are arranged apart from each other in the circumferential direction of the workpiece to be pressed W, the steadying of a plurality of locations away from each other on the workpiece to be pressed W is performed substantially simultaneously. It becomes possible.

  Thereafter, the upper mold 10 is lowered by the mold driving device 30 to press the workpiece W to be pressed. Since the workpiece W is positioned by the first to fourth vibration suppressing members 23 to 26 until immediately before being pressed, and is positioned by the center and end positioning pins 21 and 22 during the pressing, High-precision pressing can be performed.

  In addition, since the workpiece W is processed so as to have a hat cross section, the peripheral portion of the workpiece W escapes from the first to fourth vibration suppressing members 23 to 26 as the processing proceeds. The pressed workpiece W does not interfere strongly with the first to fourth shake suppressing members 23 to 26.

  As described above, according to this embodiment, the vibration suppressing members 23 to 26 that come into contact with the peripheral portion of the workpiece to be pressed W are provided around the molding surface 20 a of the lower mold 20. Positioning can be performed with high accuracy, and vibration of the workpiece W before pressing can be suppressed. And it can position by the positioning pins 21 and 22 during a press work. Therefore, highly accurate press work can be performed.

  In addition, since the first and second shake suppressing members 23 and 24 and the third and fourth shake suppressing members 25 and 26 are arranged so as to sandwich the workpiece W to be pressed, respectively, more highly accurate pressing is performed. It can be carried out.

  Further, since the guide surfaces 23a to 26a for guiding the workpiece to be pressed W to the molding surface 20a of the lower mold 20 are provided on the upper side of the first to fourth shake suppressing members 23 to 26, the workpiece to be pressed W is provided. The lower mold 20 can be set smoothly.

  The present invention can be applied not only to automobile parts, but also to pressing of architectural members or electrical products.

  In addition, the shape of the workpiece to be pressed W is not limited to an elongated shape, and the press workpiece 1 can process workpieces W having various shapes.

  In addition, as the pressing process, a bending process or a drawing process may be performed alone, or a drilling process, a trimming process, a cutting process, or the like may be performed simultaneously with the bending process or the drawing process.

  Moreover, in the said embodiment, although the four vibration suppression members are provided, not only this but at least one should just be provided, Preferably it is two. When two runout suppression members are provided, the first and second runout suppression members 23 and 24 positioned so as to sandwich the pressed workpiece W are provided, and the others are omitted, or the third and fourth runout suppression members. Preferably, 25 and 26 are provided and the others are omitted.

  Further, the number of positioning pins is not limited to the number described above, and can be any number, and the position of the positioning pins can be arbitrarily set according to the shape of the workpiece W to be pressed. .

  As described above, the pressed workpiece positioning structure and press working apparatus according to the present invention can be applied to, for example, hot press molding of automobile parts.

1 Press processing device 10 Upper die 20 Lower die (press die)
30 type driving device 21 central positioning pin 22 end positioning pins 23 to 26 first to fourth vibration suppressing members Y positioning structure W of pressed workpiece W pressed workpiece W1 central positioning hole W2 end positioning hole

Claims (4)

In a positioning structure of a pressed workpiece for positioning a heated plate-shaped pressed workpiece on a press die for hot pressing,
A positioning pin provided in the press die and inserted into a positioning hole formed in the pressed workpiece;
Provided around the molding surface of the press mold and contact the peripheral edge of the pressed workpiece to suppress the deflection of the pressed workpiece and to position the pressed workpiece before pressing. A positioning structure for a workpiece to be pressed, comprising: In the positioning structure of the workpiece to be pressed according to claim 1,
A positioning structure for a workpiece to be pressed, wherein the first and second run-out suppressing portions are arranged so as to sandwich the workpiece to be pressed placed in a press die in a plan view. In the positioning structure of the workpiece to be pressed according to claim 1 or 2,
The runout suppression part protrudes upward from the periphery of the molding surface provided on the upper surface of the press mold,
A guide portion for guiding the pressed workpiece to the molding surface when the workpiece to be pressed is placed on the molding surface is provided on the upper side of the deflection suppressing portion. A structure for positioning a workpiece to be pressed, characterized in that the lower portion is in contact with the workpiece to be pressed. In a press working apparatus for hot pressing a heated plate-shaped workpiece,
A press die having a molding surface;
A positioning pin provided in the press die and inserted into a positioning hole formed in the pressed workpiece;
Provided around the molding surface of the press mold and contact the peripheral edge of the pressed workpiece to suppress the deflection of the pressed workpiece and to position the pressed workpiece before pressing. A press working apparatus comprising a run-out suppressing portion for the purpose.

Images