JP2006116567A - Press forming method and press forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press forming method by which material flow which is generated on a work is controlled without bringing about the drop of yield or the like. <P>SOLUTION: In a pressing step ( pressing step using a press 5 for rough bending ) after charging the work 100, a conical parts 105 is formed in the set position of the work 100 with conical die parts 19b, 25b which are provided on a lower die 16 and an upper die 17, in pressing steps ( a pressing step using a press 6 for finish bending and a pressing step using a press 7 for trimming ) after now, press working is applied to a work 101 ( or a work 102 ) in a state where the conical part 105 is held with conical guide parts 39b, 41b provided on a lower die 36 and an upper die 37( or conical guide parts 59b, 61b provided on a lower die 56 and an upper die 57 ). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press molding method and a press molding system that perform a plurality of press processes on a workpiece using a plurality of molds.

  In general, large sheet metal products such as vehicle hood panels are formed by subjecting a workpiece to a plurality of press workings using various dies such as a rough bending mold and a finish bending mold. The Therefore, in the molding of this type of sheet metal molded product, it is required to accurately position and place the workpiece on each die when performing each pressing.

In this case, various types of work positioning on a mold have been proposed in the past. For example, in Patent Document 1, a plurality of work positioning pins made of prisms are planted in a press lower mold, and each work positioning pin is provided. A technique for positioning a work by bringing the formed ruler surface into surface contact with the end face (side surface) of the work uniformly is disclosed. Further, for example, in Patent Document 2, after the plate-shaped material (work) is temporarily positioned on the lower mold of the mold, the tip of the precision positioning pin is inserted into the precision positioning hole of the work as the upper mold descends, In addition, there is disclosed a technique for precisely positioning a workpiece by inserting a precision positioning pin having a diameter substantially the same as that of a positioning hole.
Japanese Utility Model Publication No. 6-15830 Japanese Patent Application Laid-Open No. 11-179697

  However, since the technique disclosed in Patent Document 1 described above merely positions the work on the die by the guide of the work end surface, the material flow generated in the work is controlled at the time of performing a bending process or the like. This is difficult, and there is a risk of variations in the resulting press-formed product.

  On the other hand, although the technique disclosed in Patent Document 2 can control the material flow during pressing by inserting a positioning pin into the positioning hole, it is necessary to drill the positioning hole in an initial step. When drilling such holes, etc., the generated chips and the like may damage the workpiece in the subsequent press process and reduce the yield of the press-formed product.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a press molding method and a press molding system capable of controlling the material flow generated on a workpiece without causing a decrease in yield or the like. And

  The press molding method according to the present invention includes a first press step of forming a conical shape portion at a set position on a workpiece by a conical mold portion formed of a male and female pair formed on an upper die and a lower die of a first mold, A second pressing step of pressing the workpiece in a state where the conical shape portion is sandwiched by a conical guide portion formed in a male and female pair formed on the upper die and the lower die of 2 molds. It is characterized by.

  Further, the press molding system of the present invention includes a first press having a first mold in which a conical mold part forming a male and female pair for forming a conical part at a set position on a work is formed in an upper mold and a lower mold. And a second press machine having a second mold in which a conical guide part forming a male-female pair sandwiching the conical part is formed into an upper mold and a lower mold. .

  According to the press molding method and the press molding system of the present invention, the material flow generated on the workpiece can be controlled without causing a decrease in yield or the like.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a press molding system, FIG. 2 is a plan view showing the state of a workpiece in each process, and FIG. FIG.

  In FIG. 1, reference numeral 1 denotes a press molding system for molding a hood outer panel of a vehicle, for example. In this embodiment, the press molding system 1 includes, for example, a rough bending press machine 5 for performing a rough bending process on a charged workpiece (blank material; see FIG. 2A) 100, and a rough bending press. A finishing bending press machine 6 for performing a finishing bending process on a workpiece (coarse bending molded body; see FIG. 2B) 101 processed by the machine 5, and a workpiece processed by the finishing bending press machine 6 ( A finish bending molded body (see FIG. 2C) 102 has a trimming press machine 7 for performing trimming processing. Then, by trimming the finished bending molded body 102 by the trimming press 7, as a final press molded product by the press molding system 1, for example, a hood outer panel molded body 103 shown in FIG. Can be obtained.

  The rough bending press machine 5 includes a rough bending molding die 15 including a lower die 16 and an upper die 17 set on a press machine body 10 to constitute a main part.

  In this embodiment, the lower die 16 of the rough bending mold 15 includes a lower die set 18 fixed to the base 11 of the press machine body 10 and a lower die 19 fixedly supported by the lower die set 18. And a blank holder 20 that is elastically supported by the lower die set 18 via an elastic member 21 such as a cushion pin or a spring at the side portion of the lower die 19.

  On the top surface of the lower die 19, a molding surface 19 a having a predetermined shape for subjecting the workpiece 100 to rough bending is formed. 19b is formed. Here, the cone-shaped portion 19b has a plurality of locations (for example, 2 regions) corresponding to the region on the workpiece 100 to be trimmed by the trimming press machine 7 described later (that is, the region other than the region where the final press-molded product is taken). ). Further, a contact surface 20 a is formed on the top surface of the blank holder 20 to contact a non-processed region set at an end on the workpiece 100.

  On the other hand, the upper mold 17 of the rough bending mold 15 has an upper die set 24 fixed to a lifting mechanism (not shown) of the press machine body 10 and an upper die 25 fixedly supported by the upper die set 24. .

  A molding surface 25a corresponding to the molding surface 19a of the lower die 19 is formed on the bottom surface of the upper die 25, and the molding surface 25a corresponds to the conical mold portion 19b of the lower die 16, for example, upward A concave conical portion 25b is formed. Further, a contact surface 25 c corresponding to the contact surface 20 a of the blank holder 20 is formed on the bottom surface of the upper die 25.

  With such a configuration, the rough bending press machine 5 has a conical mold portion 19b that forms a male and female pair formed in the lower mold 16 and the upper mold 17 of the rough bending mold 15 during the rough bending process on the workpiece 100. The conical portion 105 is formed at a set position on the workpiece 100 by 25b.

  That is, in this embodiment, the main pressing process by the rough bending press machine 5 functions as a first pressing process for forming the conical portion 105 at a set position on the workpiece 100. The rough bending press machine 5 has a function as a first press machine, and the rough bending mold 15 has a function as a first mold.

  The finishing bending press machine 6 includes a finishing bending molding die 35 including a lower die 36 and an upper die 37 set in a pressing machine main body 30 to constitute a main part.

  In the present embodiment, the lower die 36 of the finish bending mold 35 includes a lower die set 38 fixed to the base 31 of the press machine body 30 and a lower die 39 fixedly supported by the lower die set 38. And have.

  Formed on the top surface of the lower die 39 is a molding surface 39a having a predetermined shape for subjecting the workpiece (rough bending molded body) 101 formed by the rough bending press machine 5 to finish bending. On the molding surface 39a, a guide portion 39b having a convex conical shape, for example, is formed at a position corresponding to the conical portion 105 on the workpiece 101. Further, on the top surface of the lower die 39, an abutting surface 39c that abuts on a non-working region on the workpiece 100 is formed adjacent to the molding surface 39a.

  On the other hand, the upper die 37 of the finish bending molding die 35 includes an upper die set 40 fixed to a lifting mechanism (not shown) of the press machine body 30, an upper die 41 fixedly supported by the upper die set 40, and an upper die 37. A blank holder 42 elastically supported by the upper die set 40 via an elastic member 43 such as a cushion pin or a spring is provided on the side of the die 41.

  A molding surface 41a corresponding to the molding surface 39a of the lower die 39 is formed on the bottom surface of the upper die 41. The molding surface 41a corresponds to the guide portion 39b of the lower die 36, for example, upward. A guide portion 41b having a concave conical shape is formed. A contact surface 42 a corresponding to the contact surface 39 c of the lower die 39 is formed on the bottom surface of the blank holder 42.

  With such a configuration, the finishing bending press machine 6 has a conical shape on the workpiece 101 by the guide portions 39b and 41b forming a male and female pair formed on the lower die 36 and the upper die 37 when the workpiece 101 is finished and bent. The part 105 is sandwiched. Then, the workpiece 101 is pressed by the pinching of the conical portion 105 in a state where the workpiece 101 is positioned and held with high accuracy at the set position on the finish bending mold 35. More specifically, when the loaded workpiece 101 is deviated from the set position on the lower mold 36 (see FIG. 3A), the central axis of the conical portion 105 coincides with the central axis of the guide portion 39b. As described above, the conical portion 105 slides along the conical surface of the guide portion 39b (that is, a self-aligning function works between the guide portion 39b and the conical portion 105). Thereby, the positioning error with respect to the lower mold | type 36 of the workpiece | work 101 is correct | amended (refer FIG.3 (b)). When the upper die 37 (upper die 41) is lowered, the conical portion 105 is sandwiched between the guide portion 39b and the guide portion 41b (see FIG. 3C), whereby the workpiece 101 is subjected to finish bending. It is positioned and held at a set position on the molding die 35 with high accuracy.

  That is, in this embodiment, at least the final pressing process performed by the finishing press 6 after forming the conical portion 105 is a process in which the workpiece 101 is pressed while the conical portion 105 is sandwiched between the guide portions 39b and 41b. 2 functions as a pressing step. The finishing press machine 6 has a function as a second pressing machine, and the finish bending mold 35 has a function as a second mold.

  The trimming press machine 7 includes a trimming molding die 55 including a lower die 56 and an upper die 57 set in a press machine main body 50 to constitute a main part.

  In this embodiment, the lower mold 56 of the trimming mold 55 includes a lower die set 58 fixed to the base 51 of the press machine main body 50, and a lower die 59 fixedly supported by the lower die set 58. Have

  A contact surface 59a is formed on the top surface of the lower die 59 so as to be in contact with the forming surface of the workpiece 102 formed by the finishing bending press 6, and the contact surface 59a is provided at an important point of the contact surface 59a. A guide portion 59b having a conical shape convex upward is formed at a position corresponding to the conical shape portion 105 on the workpiece 102, for example.

  On the other hand, the upper die 57 of the trimming mold 55 is fixed to an upper and lower lifting mechanism (not shown) of the press machine main body 50, and an elastic member 63 such as a cushion pin or a spring is attached to the upper die set 60. And an upper die 61 that is elastically supported, and a trimming cutter 62 that is fixedly supported by the upper die set 60.

  A contact surface 61 a corresponding to the contact surface 59 a of the lower die 59 is formed on the bottom surface of the upper die 61, and the contact surface 61 a corresponds to the guide portion 59 b of the lower die 56, For example, a guide portion 61b having a concave conical shape is formed on the upper side. The cutter 62 is disposed on the inner side of the guide portion 61b so as to separate at least the conical portion 105 from the workpiece 102 during trimming.

  With such a configuration, the trimming press machine 7 has a conical shape portion 105 on the workpiece 102 by the guide portions 59b and 61b forming a male and female pair formed on the lower die 56 and the upper die 57 when the workpiece 102 is trimmed. Pinch. Then, the workpiece 102 is pressed while being positioned and held on the trimming molding die 55 with high accuracy by sandwiching the conical portion 105.

  That is, in this embodiment, at least the main pressing step performed by the trimming press 7 after forming the conical portion 105 is a process in which the workpiece 102 is pressed while the conical portion 105 is sandwiched between the guide portions 59b and 61b. 2 functions as a pressing step. The trimming press machine 7 has a function as a second press machine, and the trimming mold 55 has a function as a second mold.

  According to such a form, in the pressing process using the rough bending press 5, the conical portion 105 is formed at the set position of the workpiece 100 by the conical mold portions 19 b and 25 b provided on the lower die 16 and the upper die 17. In the subsequent press process (the press process using the finishing bending press machine 6 and the press process using the trimming press machine 7), the conical guide portions 39b provided in the lower mold 36 and the upper mold 37 are used. 41b (or conical guide portions 59b and 61b provided on the lower die 56 and the upper die 57), the workpiece 101 (or the workpiece 102) is pressed in a state where the cone-shaped portion 105 is sandwiched between the presses. The workpiece can be accurately positioned on the mold without reducing the yield of the molded product, and the material flow generated on the workpiece can be controlled.

  In other words, by guiding the conical portion molded on the workpiece to the set position with the guide portion disposed on the mold, the workpiece can be positioned relative to the mold without drilling a positioning hole in the workpiece. Can be realized with high accuracy. Therefore, the workpiece can be accurately positioned at the set position on the mold without causing a decrease in the yield of the press-formed product due to the generation of chips and the like. At that time, in particular, the conical shape portion is disposed at a suitable position on the workpiece, and this conical shape portion is sandwiched by a conical guide portion forming a male and female pair disposed on the lower die and the upper die of the mold. It is possible to effectively control the material flow generated at the drawing forming part on the workpiece during pressing.

  In addition, by setting the forming position of the conical shape portion to the part on the workpiece that is removed during trimming, it is possible to prevent the final shape of the press-formed product from being affected.

  In the above-described embodiment, the cone-shaped portion 105 is formed on the workpiece 100 in the pressing process using the rough bending press machine 5, and the subsequent pressing process (the pressing process using the finishing bending press machine 6, and The example of positioning the workpiece using the cone-shaped portion 105 in the pressing process using the trimming press machine 7) has been described, but the present invention is not limited to this, and in the series of pressing processes, any Of course, the cone-shaped portion may be formed on the workpiece at the above timing. For example, when there is another press process in the process before the press process using the above rough bending press machine, the conical portion 105 is formed in the separate press process, and in each subsequent press process, Alternatively, positioning using the conical portion 105 may be performed.

  Of course, the forming position and the number of the conical portions 105 formed on the workpiece 100 are not limited to those described above.

Schematic configuration diagram of press molding system Plan view showing the state of the workpiece in each process Explanatory drawing which shows the workpiece | work guided by a cone guide part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Press molding system 5 ... Coarse bending press (1st press)
6 ... Finish bending press (second press)
7 ... Trimming press (second press)
15 ... Rough bending mold (first mold)
16 ... Lower mold 17 ... Upper mold 19b, 25b ... Conical part (conical part forming male and female pairs)
35 ... Finish bending mold (second mold)
36 ... Lower mold 37 ... Upper mold 39b, 41b ... Guide part (conical guide part forming a male and female pair)
55 ... Trimming mold (second mold)
56 ... Lower mold 57 ... Upper mold 59b, 61b ... Guide part (conical guide part forming a male-female pair)
DESCRIPTION OF SYMBOLS 100 ... Work 101 ... Work 102 ... Work 103 ... Hood outer panel molded object 105 ... Conical shape part
Agent Patent Attorney Susumu Ito

Claims (4)

A first pressing step of forming a conical shape portion at a set position on the workpiece by a conical mold portion forming a male and female pair formed on the upper die and the lower die of the first mold;
A second pressing step of pressing the workpiece in a state where the conical shape portion is sandwiched by a conical guide portion forming a male and female pair formed on the upper die and the lower die of the second mold. The press molding method characterized by the above-mentioned.   2. The press forming method according to claim 1, wherein the conical portion is formed at a portion on the workpiece to be removed during trimming. A first press machine having a first mold in which a conical mold part forming a male and female pair that forms a conical shape part at a set position on a workpiece is formed into an upper mold and a lower mold;
A press molding system comprising: a second press machine having a second mold in which a conical guide part forming a male and female pair sandwiching the conical part is formed into an upper mold and a lower mold. .   The press forming system according to claim 3, wherein the first press machine forms the conical portion at a portion on the work to be removed during trimming.

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