JP6654901B2 - Press forming apparatus and press forming method - Google Patents

Description

  The present invention relates to a press forming apparatus and a press forming method in which press working is performed in a state where different parts are clamped, and subsequently the different parts are joined.

  Due to the demand for lighter vehicles, there is a tendency to switch the material that forms a part of the structure such as the body and frame from steel plate to aluminum alloy or carbon resin. In some cases, a structure may be formed by combining aluminum and aluminum parts, or steel plate parts or aluminum parts and carbon resin.

  Generally, since a steel plate part and an aluminum part or a steel plate part or an aluminum part and a carbon resin part cannot be connected by welding, rivet joining using self-piercing rivets or the like is widely used. When such a plurality of parts are riveted, a step of joining completed parts is provided on a body assembly line, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-237262. The caulking operation is performed using a caulking device as disclosed in Document 2 (Japanese Patent Application Laid-Open No. 2007-75866).

JP 2007-237262 A JP 2007-75866 A JP-A-2002-301528

  As disclosed in Patent Document 1 described above, when finished products are temporarily assembled on a body assembly line, and in that state, riveting is performed using a caulking device as disclosed in Patent Document 2. It is necessary to separately set a process for joining rivets to this body assembly line. In addition, it is necessary to assemble the completed parts one by one, which is disadvantageous in that the number of assembling steps is increased.

  In particular, in the case of rivet joining using a self-piercing rivet, since a caulking operation is performed while piercing between parts, a relatively large load is required, the caulking device becomes large, and not only does the equipment cost increase, There is also a disadvantage that it is difficult to secure a sufficient working space.

  Therefore, for example, in Patent Document 3 (Japanese Patent Application Laid-Open No. 2002-301528), a crimping machine that joins two pressed parts with rivets is incorporated in a press forming line that presses two parts individually, and press forming is performed. There is disclosed a technique in which the latter two parts are joined in a press forming line.

  However, in the technique disclosed in Patent Literature 3, the rivet joining process on the body assembly line can be omitted, but only a caulking machine is simply incorporated in the press forming line, and the rivet is formed in the press forming line. Only the number of joining steps increases, and it is difficult to contribute to a reduction in the overall man-hour. Furthermore, since the caulking machine is incorporated in the press molding line, there is also a disadvantage that the entire line configuration becomes large.

  The present invention has been made in view of the above circumstances, and even if the process of joining parts is incorporated into a press molding line, the number of steps is not significantly increased, and furthermore, it is possible to suppress the increase in the size of the entire line and realize space saving. It is an object of the present invention to provide a press forming apparatus and a press forming method that can be used.

A first aspect of the present invention includes a first press die, and a second press die that can be freely moved toward and away from above via a press movable member with respect to the first press die. In a press forming apparatus for forming parts into a predetermined shape by pressing parts, a narrow pressure part provided on the opposing surface of the two press dies and overlapping and pressing two different parts is provided on the opposing surface of the two press dies. a processing unit for pressing at least one of the two different parts are, the extrusion member pushes out the self-piercing rivet is provided on one of the two press die to the narrow pressure section direction, the proximal end of the pusher member and projecting means for the said self piercing rivet through the extrusion member while interconnects the press movable member, is extruded implant into the two different parts directions being pinched bonding the component and, the press movable member In a state where the second press die is connected to the second press die and the second press die is pressed against the first press die and the part is pressed in the processing part, the descending movement of the press movable member is performed by a compression displacement. Pressure holding means for allowing the protrusion means to protrude and operate.

A second aspect of the present invention includes a first press die, and a second press die which can be freely moved toward and away from above via a press movable member with respect to the first press die. in the press forming forms a method of forming a predetermined shape by applying clamping parts, after setting overlapped two parts different in narrow pressure portion provided on the facing surfaces of both the press die, with the descent of the press movable member first pressing at least one of the two different parts of the two different components by the narrow pressure section in a state in which nipped, then the self-piercing rivet the at two different while maintaining the narrow pressure parts, comprising said different 2 Driving in the direction of the parts , extruding and joining.

  According to the present invention, since the parts are joined together with the press working performed in a state where different parts are superimposed, even if the step of joining the parts is incorporated into the press forming line, the man-hour is not significantly increased. In addition, since the press movable member is used as a driving source, an increase in the size of the entire line is suppressed, and space saving can be realized.

Explanatory drawing which shows the flow of the molding process in the press molding apparatus by 1st Embodiment. Schematic configuration diagram showing the standby state of the press molding apparatus. Schematic configuration diagram showing the state of molding by the press molding apparatus FIG. 3 is an enlarged view of a main part of FIG. 4 is an enlarged view of a portion V in FIG. 4, (a) is an enlarged view of a state immediately before press working, (b) is an enlarged view of a state after working, and (c) is an enlarged view of a state of rivet bonding. It is an enlarged view corresponding to FIG. 5 by 2nd Embodiment, (a) is an enlarged view of a standby state, (b) is an enlarged view of the right side main part of (a). 6A is an enlarged view corresponding to FIG. 6A in a state where a pad is in contact with a processing blade, and FIG. 6B is a right side view of a main part of FIG. FIG. 7A is an enlarged view corresponding to FIG. 7A in a state where a workpiece is bent by a processing blade, and FIG. 7B is a right side view of a main part of FIG. FIG. 7A is an enlarged view corresponding to FIG. 7A with the self-piercing rivet pushed down, and FIG. 7B is a right side view of a main part of FIG. FIG. 7 (a) is an enlarged view showing the state in which the work and the brace material are riveted to each other.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 5 show a first embodiment of the present invention. FIG. 1 shows a flow of molding performed in the press molding line according to the present embodiment. That is, when a panel-shaped work W as a component preformed to a predetermined size is put into the press forming line while being gripped by a material handling (material handling) robot or the like, first, in a first step S1, Then, press forming such as bending, drawing, and shearing is performed, and then, in a second step S2, a brace material B as a finished product as a part formed in a predetermined shape in advance is charged. Then, in the third step S3, the panel-like workpiece W and brace B is bent by temporarily assembled state together, in the fourth step S4 for continuous thereto, a self-piercing rivet R of a crimped member Then, the end of the panel-shaped work W and the joining surface Ba formed at the end of the brace material B are riveted. Since the press forming performed in the first step S1 is well known, the following description will be omitted. The panel-shaped work W is made of a steel plate, while the brace material B has a material different from that of the panel-shaped work W, such as an aluminum alloy or a carbon resin.

  The above-described second step S2 to fourth step S4 are executed by the composite press forming apparatus 1 provided in the press forming line. As shown in FIG. 2, the composite press device 1 includes a lower punch 2 as a first press die fixed to a lower die shoe 4, and a second press die facing a molding surface 2 a of the lower punch 2. And an upper machining blade 3 as a mold. The lower punch 2 and the upper processing blade 3 are elongated along the side of the panel-shaped work W shown in FIG.

  The lower shoe 4 is fixed to a base (not shown). A pair of columns (not shown) are opposed to each other in front of and behind the base sheet, and a ram (not shown) is mounted between guides provided on the opposed surfaces of the columns so as to be able to move up and down. The upper shoe 5 is suspended from the ram. A beam (not shown) is provided on the upper surface of the pair of opposed columns, and an elevating means (not shown) for raising and lowering the ram is fixed to the beam. In this embodiment, the ram and the upper shoe 5 function as a press movable member.

  On the bottom surface of the upper shoe 5, a constant pressure holding source 6 as a pressure holding means is fixed. The constant pressure holding source 6 absorbs the stroke of the upper die shoe 5 so that the upper processing blade 3 can stop while maintaining the pressing force against the lower punch 2 even during the lowering operation of the upper die shoe 5. is there. The constant pressure holding source 6 uses a gas spring, a hydraulic spring, a coil spring, or the like as a resilient source, and a pad 7 is fixed to a lower portion. The upper surface of the upper processing blade 3 is fixed to the pad 7.

  As shown in FIG. 4, a forming surface 2a on which the joining surface Ba formed on the end of the brace material B of the finished product is placed is formed on the lower punch 2, and the end of the panel-shaped work W is formed on the end. The edge part 2b which forms the flange by bending the edge part Wa is formed. On the other hand, an edge blade 3b that presses the panel-shaped work W against the edge portion 2b is formed at one end of the pressing surface 3a of the upper processing blade 3 facing the forming surface 2a. It should be noted that the molding surface 2a and the pressing surface 3a constitute a narrow pressure portion of the present invention. Further, the processed portion of the present invention is constituted by the edge portion 2b and the edge blade 3b.

  The lower punch 2 is provided with a pin guide hole 2c at a position facing the pressing surface 3a of the upper processing blade 3 and at a position corresponding to the joint of the brace material B. A rivet pushing pin 8 as a pushing member is inserted into each of the pin guide holes 2c. Further, a rivet guide cylinder 9 as a supply unit is inserted into each of the pin guide holes 2c. A self-piercing rivet R is supplied to each rivet guide cylinder 9 from a rivet feeder (not shown).

  Further, the lower end of each rivet push pin 8 is connected to a rivet push-up cam mechanism 11 as a projecting means. As shown in FIG. 2, the rivet push-up cam mechanism 11 has a base 12 disposed in parallel from the front of the drawing to the back of the drawing in parallel with the lower punch 2. 4 stands. The base 12 is formed in a cross-sectional groove shape opening upward, and a return pressure source 13 is fixed to one of the upright portions 12a. The return pressure source 13 has a coil spring 13a, and the coil spring 13a and a retainer 13b abutting on an end face of the coil spring 13a are externally mounted on a spring guide shaft 13c.

  A hook 14a provided at the lower end of the cam transmission member 14 is hooked on the retainer 13b. The cam transmission member 14 has a cam surface receiver 14b formed on one of the left and right sides of the paper surface and a cam surface 14c formed on the other, and is supported by a slide guide (not shown), and is allowed to move only in the horizontal direction in FIG. The cam receiving surface 14b is in sliding contact with the cam surface 15a of the cam pressing member 15. The cam pushing member 15 is supported by a slide guide 12c formed on the other standing portion 12b of the base 12, and is allowed to move only in the vertical direction. A cam head 16 is fixed on the upper surface of the cam pushing member 15. I have. Further, a lower end 17 a of a cam driver 17 suspended from the upper shoe 5 is fixed to the cam head 16.

  On the other hand, the cam receiving surface 18a of the push-up cam 18 is in sliding contact with the cam surface 14c of the cam transmission member 14, and the rivet push pin 8 is fixed on the upper surface of the push-up cam 18. The push-up cam 18 is supported by a cam guide (not shown) in such a manner that only vertical movement is allowed. The pressing surface 3a of the upper processing blade 3 is formed with a crimping concave portion 3c which receives a portion protruding to the opposite side by the pressing of the self-piercing rivet R and crimps.

  Next, the operation when processing the panel-shaped work W and assembling the brace material B using the composite press apparatus 1 having such a configuration will be described.

  When the composite press device 1 is in a standby state (top dead center) as shown in FIG. 2, the end portion of the brace material B of the finished product conveyed by the material handling robot or the like onto the forming surface 2 a of the lower punch 2. The formed joining surface Ba is set, and the end Wa of the panel-shaped work W is further set and positioned on the upper surface thereof.

  Next, when the upper shoe 5 starts descending, as shown in FIG. 5A, the pressurizing surface 3a of the upper machining blade 3 that is suspended from the upper shoe 5 via the constant-pressure holding source 6 causes the panel-like work. Close to W. Then, as shown in FIGS. 3 and 5 (b), an edge blade 3b formed at one end of the pressing surface 3a forms an end Wa of the panel-shaped work W on the forming surface 2a of the lower punch 2. Pressed against the edge portion 2b, and bent to form a flange.

  Thereafter, when the upper shoe 5 further descends, the constant pressure holding source 6 is compressed and displaced via the pad 7 fixedly provided at the lower end thereof, and the panel-like workpiece W and the brace material are moved by the upper working blade 3 and the punch 2. And the joint with B.

  On the other hand, with the lowering of the upper shoe 5, the cam driver 17 fixed to the upper shoe 5 presses the cam pressing member 15 via the cam head 16 downward. At this time, since the downward stroke of the upper die 5 is absorbed by the compression displacement of the constant pressure holding source 6, the stopped state of the upper machining blade 3 is maintained.

  Then, the cam surface 15a formed on the cam pressing member 15 presses the cam receiving surface 14b formed on one of the cam transmission members 14. As a result, the cam transmission member 14 moves in the horizontal direction, the hook 14a formed at the lower end compresses the coil spring 13a via the retainer 13b of the return pressure source 13, and the cam surface formed on the other side. 14 c presses the cam receiving surface 18 a of the push-up cam 18.

  Then, the push-up cam 18 is pushed up, and the rivet push pin 8 fixed on the upper surface pushes up the self-piercing rivet R sequentially supplied from the rivet guide cylinder 9 to the pin guide hole 2c by a rivet feeder (not shown). As shown in FIGS. 3, 4 and 5 (c), the self-piercing rivet R is composed of a brace material B and a panel-like work which are fixedly clamped between the lower punch 2 and the pressing surface 3a of the upper processing blade 3. The joining surface Ba of the brace material B is pierced in this joining process, and the panel-shaped work W and the self-piercing rivet R are projected to the opposite side. Then, the brace material B and the panel-shaped work W are riveted to each other by plastic deformation by receiving the crimped concave portion 3c.

  Thereafter, when the upper shoe 5 reaches the bottom dead center, the upper shoe 5 turns in the ascending direction, and the cam driver 17 suspended from the upper shoe 5 firmly contacts the cam head 16 and the cam head 16 with the cam pushing member 15. When the cam transmission member 14 moves upward while sliding at 15a, the cam transmission member 14 receives the elastic force of the coil spring 13a provided on the return pressure source 13 and slides to the left in FIG. As a result, the cam receiving surface 14b presses the cam surface 15a of the cam pressing member 15 to raise the cam pressing member 15. The push-up cam 18 is lowered by its own weight or by the urging force of a tension spring (not shown) because the cam surface 14c is about to separate from the cam receiving surface 18a, and is returned to the initial position shown in FIG.

  On the other hand, as the upper die shoe 5 rises, the pressing force on the upper processing blade 3 which is suspended from the constant pressure holding source 6 via the pad 7 is gradually released, and the upper processing blade 3 is separated from the lower punch 2. Then, as shown in FIG. 2, the upper shoe 5 rises until it reaches the top dead center.

  As described above, according to the present embodiment, the bending process of the end Wa of the panel-shaped work W and the brace of the panel-shaped work W by the self-piercing rivet R are performed by the composite press apparatus 1 incorporated in the press forming line. Since the rivet joining with the material B is performed continuously during the pressing process, even if the rivet joining process is incorporated into the press forming line, the man-hour does not increase significantly, and the The step of joining the panel-shaped work W and the brace material B can be omitted or shortened.

  Further, since the rivet push-up cam mechanism 11 is operated by using the lowering operation of the upper die shoe 5 as a driving source, it is possible to suppress an increase in the size of the apparatus and to save space.

  Further, since the self-piercing rivet R is driven with the lower punch 2 and the upper processing blade 3 overlapping the panel-shaped work W and the joining surface Ba of the brace material B and holding the narrow pressure, a distortion occurs in both. Difficult, no excessive stress concentration occurs at the time of drilling, and no stress distortion occurs at the joint surface.

[Second embodiment]
6 to 10 show a second embodiment of the present invention. In the above-described first embodiment, the self-piercing rivet R supplied to the pin guide hole 2c formed in the lower punch 2 is pushed up from the lower punch 2 side and rivet-joined. The self-piercing rivet R is driven into the panel-shaped work W and the brace material B from the upper processing blade 3 side. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be simplified.

  The upper die shoe 5 of the composite press apparatus 1 (see FIG. 6) has a lower end provided with a constant pressure holding source 6 for fixing a pad 7 at a lower end, and a rivet punch 5a as a projecting means and a punch member. ing.

  The rivet punch 5a faces a caulking recess 2e formed on the molding surface 2a of the lower punch 2. Further, the upper processing blade 21 faces the forming surface 2a of the lower punch 2. Further, an edge blade 21b is formed at one end of a pressing surface 21a formed at the lower end of the upper processing blade 21 to press the end Wa of the panel-shaped work W against the edge 2b of the lower punch 2 to bend the flange. I have. The molding surface 2a and the pressing surface 21a constitute a narrow pressure portion of the present invention.

  The upper processing blade 21 is provided with a pin guide hole 21c having a lower end opening to the pressing surface 21a, and the rivet push pin 8 is inserted into the pin guide hole 21c. The base side of the rivet push pin 8 protrudes from the upper surface of the upper processing blade 21, and a pin head 8a is formed at the upper end thereof. Further, a return spring 22 is provided on the rivet pushing pin 8, and an upper end of the return spring 22 is hooked on the pin head 8 a, and a lower end is hooked on the upper machining blade 21.

  Also, a rivet guide hole 21d as a supply unit facing the pin guide hole 21c in a direction orthogonal to the pin guide hole 21c is formed in the upper machining blade 21. The rivet guide hole 21d communicates with a rivet feeder (not shown). A rivet guide cylinder 9 is connected, and a self-piercing rivet R is supplied to the rivet guide hole 21d by the rivet feeder.

  When the upper die shoe 5 is lowered, the constant pressure holding source 6 presses the upper surface of the upper processing blade 21 via the pad 7, while the rivet punch 5 a is a pin head 8 a of the rivet pushing pin 8 protruding from the upper processing blade 21. Press. 6A to 9A, the rivet punch 5a is omitted.

  In such a configuration, when the upper shoe 5 of the composite press apparatus 1 (see FIG. 2) is in a standby state (top dead center) as shown in FIG. The joining surface Ba of the brace material B of the finished product conveyed by the above is placed, and further, the end Wa of the panel-shaped work W is placed and positioned on the upper surface thereof. The upper processing blade 21 attached to the arm portion of the material handling robot is made to face the molding surface 2a.

  Thereafter, when the lowering of the upper die shoe 5 is started, as shown in FIG. 7, the constant pressure holding source 6 presses the upper surface of the upper machining blade 21 via the pad 7, and the lower end of the rivet punch 5a pushes the rivet. The pin 8 comes into contact with the pin head 8a. Then, as the upper die shoe 5 descends, the constant pressure holding source 6 pushes down the upper processing blade 21 via the pad 7, and as shown in FIG. 8, the edge blade formed on the pressing surface 21 a of the upper processing blade 21. At 21b, the end Wa of the panel-shaped work W is pressed against the edge 2b formed on the forming surface 2a of the lower punch 2 to bend the flange.

  Thereafter, when the upper shoe 5 further descends, the constant pressure holding source 6 is compressed and displaced via the pad 7, and the upper processing blade 21 forms the lower punch 2 with the panel-like workpiece W and the joining surface Ba of the brace material B. It is pressed and fixed in a state of being overlapped on the surface 2a.

  On the other hand, the rivet punch 5a integrally formed with the upper shoe 5 presses the pin head 8a with the lowering of the upper shoe 5, and pushes the rivet pushing pin 8 inserted through the pin guide hole 21c into the return spring 22. Push down against the urging force of. Then, as shown in FIG. 9, the self-piercing rivet R sequentially supplied to the pin guide hole 21c by the rivet feeder (not shown) is pushed down from the rivet guide hole 21d.

  Then, as shown in FIG. 10, the self-piercing rivet R is driven into the panel-shaped work W fixed by the lower punch 2 and the pressing surface 21 a of the upper processing blade 21, and after the panel-shaped work W is pierced. Then, the self-piercing rivet R is cut into the joining surface Ba of the brace material B, and the tip is projected toward the caulking recess 2e. Then, the protruding portion is received by the caulking concave portion 2e, and is plastically deformed to rivet the panel-shaped work W and the bonding surface Ba of the brace material B.

  Thereafter, when the upper shoe 5 reaches the bottom dead center, the upper shoe turns and rises, and in the process, the pressing force of the lower end of the rivet punch 5a against the pin head 8a of the rivet pushing pin 8 is released. Therefore, the rivet push pin 8 is raised by receiving the urging force of the return spring 22 and returned to the initial position shown in FIG. On the other hand, as the upper die shoe 5 rises, the pressing force on the upper processing blade 21 of the constant pressure holding source 6 is gradually released, and therefore, the arm of the material handling robot (not shown) holding the upper processing blade 21. The part also returns the upper processing blade 21 to the initial position shown in FIG. When the upper shoe 5 reaches the top dead center shown in FIG. 2, it is stopped and enters a standby state.

  As described above, in the present embodiment, the self-piercing rivet R is driven from the upper processing blade 21 and the upper processing blade 21 is held by the arm portion of the material handling robot. In addition to the above-described effects, it is not necessary to provide the rivet push-up cam mechanism 11 in the composite press device 1, so that the configuration of the entire device is simplified and the size can be reduced.

  Further, since the pin head 8a of the rivet push pin 8 provided on the upper processing blade 21 is directly protruded by the rivet punch 5a formed on the upper die 5, the configuration is further simplified, and further space saving is achieved. Can be realized.

  Note that the present invention is not limited to the above-described embodiments. For example, the processed portion and the narrow pressure portion may be provided at positions separated from the panel-shaped work W. Further, the press working in the working portion may be punching, shearing or the like other than bending. The members to be joined may be members having the same kind of material, such as steel plates or carbon resins.

1. Composite press machine,
2. Lower punch,
2a: molding surface,
2b ... edge part,
2c: Pin guide hole,
2e ... crimping recess,
3. Upper processing blade,
3a: pressing surface,
3b ... edge blade,
3c: crimping recess,
4: Lower shoe,
5 ... Upper shoe,
5a ... rivet punch,
6 constant pressure source
7 ... pad,
8 ... Rivet extrusion pin,
8a: Pin head,
9 ... rivet guide tube,
11 ... cam mechanism,
12 ... Base,
12a, 12b ... standing part,
12c ... Slide guide,
13 ... Return pressure source,
13a: coil spring,
13b ... retainer,
13c: Spring guide shaft,
14 cam transmission member
14a ... hook,
14b: cam receiving surface,
14c: cam surface,
15: cam pushing member,
15a ... cam surface,
16 ... Cam head,
17 ... Cam driver,
18 thrust cam,
18a: cam receiving surface,
21 ... upper processing blade,
21a ... pressing surface,
21b ... edge blade,
21c: pin guide hole,
21d: rivet guide hole,
22 ... Return spring,
B ... Brace material,
Ba: joining surface,
R: Self-piercing rivet,
W: Panel-shaped work,
Wa ... end

Claims (6)

It has a first press die and a second press die which can be approached and separated from above via the press movable member with respect to the first press die. Press forming equipment
A narrow pressure portion provided on the opposing surfaces of the two pressing dies and overlapping and narrowing two different parts;
Wherein a processed portion for pressing at least one of the two press dies facing surface the two different parts provided for,
An extrusion member provided on one of the press dies and extruding a self-piercing rivet in the direction of the narrow pressure portion;
Protruding means for connecting the base end of the pushing member and the press movable member in series and driving the self-piercing rivet through the pushing member in the direction of the two different parts being pressed to join the parts. When,
The press movable member is connected to the second press die and the second press die is pressed against the first press die, and the part is pressed by the processing part. And pressurizing and holding means for allowing the projecting means to protrude and operate by allowing the downward movement of the protruding means by compressive displacement. 2. The press forming apparatus according to claim 1, wherein the processing section is provided in the narrow pressure section. The extrusion member is provided in the first press die,
3. The press-forming apparatus according to claim 1, wherein the projecting means is a cam mechanism that pushes the pushing member in conjunction with a downward movement of the press movable member. The extrusion member is provided on the second press die,
3. A press forming apparatus according to claim 1, wherein said projecting means is a punch member which operates integrally with said press movable member. It has a first press die and a second press die which can be approached and separated from above via the press movable member with respect to the first press die. In the press molding method for forming into
After setting two different parts on the narrow pressure part provided on the opposing surfaces of both press dies,
Wherein at least one of the two different components in a state in which the first said two different parts the narrow pressure portion due to lowering the nipped pressing the movable member by pressing,
Then press forming method, wherein a self-piercing rivet while maintaining a narrow pressure of the two different parts, are joined by extruding driving in the direction of the two-part comprising said different. The self piercing rivet, press-forming method according to claim 5, wherein the <br/> said Ru implanted in conjunction with the downward movement of the press movable member.

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