JP2006055907A - Compound press apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compound press apparatus for enhancing the space saving and the press working efficiency of a press shop, realizing mass production of car parts or the like, and reducing adverse effect on a product caused by nicked edges of a blade or chips. <P>SOLUTION: The press apparatus to perform drawing, trimming and flanging in one single step comprises a fixed lower die 1 and a movable upper die 12. The fixed lower die is provided with a drawing face 1b for drawing, a groove part 3 to pass a piercing cutting blade 14 of the movable upper die, and a blank holder 7 to hold a workpiece 6. The groove part 3 has a flange forming face 3a on an inner upper end of the groove part and a piercing supporting part 3b on an outer upper end of the groove part. The movable upper die is provided with a piercing cutting blade having a pointed part 14a to pierce the trimming portion of the workpiece and a bending face 14b, and a pressure source 99 having the downward energizing pressure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press working apparatus capable of performing press work in a single press process by combining three processes of drawing, trimming, and flanging.

  Conventionally, for example, when pressing a bonnet outer of an automobile, it has been realized by using a pressing process including at least three processes of drawing, trimming, and flanging.

  However, since this method requires three steps, three press apparatuses must be installed in parallel, so that a large installation space is required and the processing efficiency is poor.

Therefore, conventionally, for example, in JP-A-7-9045, as shown in FIG. 8, the upper mold 19 having two pressers 18a and 18b and the lower mold 21 having a blank holder 20 are There has been proposed a processing apparatus that performs trimming and flanging after drawing with a downward biasing pressure. According to the apparatus, the drawing process, the punching process, and the bending process are performed in a single pressing process, so that the space factor is improved and the working efficiency is improved accordingly.
JP-A-7-9045

However, the apparatus disclosed in the above Japanese Patent Application Laid-Open No. 7-9045 has the following problems.
In the conventional apparatus, since the shearing and bending are performed by the cutting and bending punch member 22, the distance between the trimming upper die cutting blade 22a and the flange forming punching surface 22b, that is, the thickness of the cutting and punching member 22 is as follows. , Determined by the flange width of the product. Here, when the flange width is shortened, it becomes difficult for the cut / bending punch member 22 to resist the stress generated during the shearing / bending process. For this reason, for example, when a product such as an outer slide roof is pressed, if the flange width of the product is not 6 mm or more, the device cannot withstand mass production processing. Due to manufacturing restrictions, it is conceivable that a product with a flange width shorter than 6 mm cannot be handled even if there is a need for it.

  In conventional devices, the trimming process is a shearing process, so there is no problem if the cross-section is almost symmetrical with respect to the center line as in the case of a slide roof outer. There is a difference in thrust between the mold and the lower mold, and the reaction force in the holding direction is different, so that the upper cutting edge 22a for trimming and the lower cutting edge 23 for trimming are the cutting edges in shearing. The minute clearance between the upper and lower blades cannot be maintained properly, and the upper and lower cutting blades may come into contact with or ride on during the shearing process, possibly causing damage to the cutting blades and generation of chips. From the viewpoint of product shape symmetry, it is conceivable that the scope of use of the invention is limited.

  The purpose of the present invention is to maintain the advantages of improving the space factor of a press factory and the improvement of processing efficiency in a conventional press processing apparatus, and further expanding the mass production of automobile parts and the like having various shapes and dimensions. An object of the present invention is to provide a composite press working apparatus that effectively reduces the adverse effects on products caused by spills and chips.

  The composite press working apparatus of the present invention is a press working apparatus that combines drawing processing, trimming processing, and flanging processing in a single press process, and includes a fixed lower mold and a movable upper mold. The lower die holds the workpiece (plate-like material) with a drawing surface for drawing, a groove part through which the piercing cutting blade of the movable upper die is inserted, and an upward biasing pressure around the fixed lower die A blank holder that has a flange forming surface for flanging at the inner upper end in the groove, and a piercing support portion at the outer upper end in the groove. The movable upper die is a workpiece trimming process. A blanking blade having a tip portion that breaks through a portion and a bending surface (a punching surface for flange molding) corresponding to the flange molding surface, and the blank supported by the movable upper die in a state of facing the blank holder, It constituted by providing an upper die pressure source having a large downward biasing pressure than increasing urging pressure of Ruda.

  Here, the mechanism of the trimming process in the press working apparatus of the present invention will be described with reference to FIG. 6. When the piercing cutting blade 14 is pushed down, the sharp end 14a of the piercing cutting blade 14 (in this example, the corrugated shape) Both sides of the upper end in the groove portion 3 of the fixed lower mold 1 (the upper end inside is the upper end of the flange molding surface 3a, and the upper end outside is the piercing support portion 3b) in contact with the workpiece 6 to apply the piercing breaking force. Thus, trimming is realized as shown in FIG. The workpiece 6 supported by the upper end sides in the groove portion 3 of the fixed lower die 1 is pulled and broken by breaking due to the contact of the tip portion 14a of the breaking blade 14 with the workpiece 6. The processing method of the present invention can be said to be a tensile breaking process, and has a feature that the breaking mechanism is different from the shearing method.

  As described above, the trimming mechanism of the present invention is not based on a pair of blade types of the upper blade and the lower blade as in the shearing method, and is therefore referred to as management of the clearance between the upper blade and the lower blade. there is no problem.

In the press working apparatus of the present invention, when the dimension of the flange width is changed, the distance t ₁ between the flange forming surface 3a and the tip portion 14a is changed so as to correspond to the flange width. the distance t ₂ of the surface 14b and the tip portion 14a may be changed (see Fig. 6.). In this respect, in the shearing method, when the flange width changes, the thickness of the cutting blade (in the present invention, heat t) itself needs to be changed each time.

  In the press working apparatus of the present invention, it is possible to share and consolidate the upper mold and the lower mold when only the flange width changes.

  When the flange width of the product changes by design along the periphery of the flange surface, the composite press processing apparatus of the present invention has a flange forming surface of the groove portion of the fixed lower die and the tip of the piercing cutting blade of the movable upper die at the time of trimming. By changing the distance to the part along the circumference of the flange forming surface according to the flange width and installing the piercing cutting blade, the processed flange width becomes the designed flange width. be able to.

  Moreover, the composite press processing apparatus of this invention can press the product whose flange width is 3 mm-14 mm.

  Here, the upper limit is set to 14 mm. When the flange width exceeds 14 mm, the distance between the tip of the piercing cutting blade and the fulcrum (work clamping part) on both sides of the work becomes long, leading to breakage. This is because the extension of the workpiece causes variations in the flange width.

Further, the lower limit is set to 3 mm. When the flange width is less than 3 mm in the workpiece flanging process by the bending surface of the piercing cutting blade and the flange forming surface of the groove, as shown in FIG. This is because the radius R of the curved portion with respect to the diameter increases, and the length W ₁ of the flat portion of the flange becomes too small.

  As described above, in the conventional press working apparatus, it is difficult to withstand mass production unless the flange width is 6 mm or more.

  Accordingly, a product having a flange width of 3 mm or more and less than 6 mm can be manufactured by the apparatus of the present invention, and the area corresponding to the product needs can be expanded.

(Function)
According to the present invention, as described above, after the workpiece is loaded and held in the press working apparatus, the movable upper die first functions as a blank holder as the movable upper die descends, and the workpiece is drawn. Then, when the workpiece is clamped between the blank holder and the movable upper die, the pressure source of the movable upper die is pressed by the pressing capability, so that the tip of the piercing blade of the movable upper die is drawn. Touching the workpiece after completion, the tip of the piercing blade and the upper ends of both ends in the groove of the fixed lower die (flange forming surface on the inner upper edge, piercing support portion on the outer upper edge) function, and trimming processing by piercing is applied to the workpiece Apply. When the trimming process is completed, the movable upper die breaking blade is inserted and inserted into the groove portion, and the bending surface of the breaking blade functions with respect to the flange forming surface of the groove portion to perform the final flanging processing.

  As described above, the three processing steps of drawing, trimming, and flanging are continuously executed in one stroke until the movable upper die reaches the bottom dead center of the pressing step.

(The invention's effect)
The combined press processing device of the present invention maintains the advantages of improving the space factor and processing capacity of the press factory, and can be expanded and utilized for mass production of automobile parts with various shapes and dimensions. It is possible to effectively reduce the adverse effects on the product due to the occurrence.

  When changing the flange width, it is not necessary to deal with cutting blades having different thicknesses, and it is possible to share and consolidate the upper and lower molds.

  Embodiments of the present invention will be described with reference to the drawings.

First, the basic configuration will be described.
In FIG. 1, the lower die punch 1 a is fixedly supported on the lower die holder 2 of the stationary lower die 1. The lower die punch 1a has a drawing surface 1b for drawing and a groove 3 on the periphery. A drawing punching surface 1c is formed at the end of the drawing processing surface 1b.
The groove part 3 has a flange forming surface 3a for flanging on the inside of the upper end in the groove part, and a piercing support part 3b on the outer side of the upper end in the groove part. A blank holder 7 is provided outside the lower die punch 1a to hold the scrap side end portion of the workpiece (plate-like material) 6 while being biased upward. Blank holder 7 is provided with a workpiece stopper 8 for positioning the workpiece 6 in accordance with the size of the workpiece 6, it is pressed and urged in the upward direction the workpiece holding surface 7a at elevated biasing pressure P _1.

  On the other hand, the upper mold holder 11 is fixed to the lower surface of the ram 2A of the press working apparatus. The upper mold holder 11 supports the movable upper mold 12 while its position is regulated by the keeper plate 13. A breaking blade 14 is built in the movable upper mold 12. The piercing cutting blade 14 has a pointed end portion 14a that pierces the workpiece trimming portion and a bending surface (flange forming punch surface) 14b corresponding to the flange forming surface 3a of the fixed lower mold 1 (see FIG. 6). The breaking blade 14 is regulated by a wear plate 16 and pushed up by a spring (gas spring) 15. The piercing cutting blade 14 does not function until the drawing is completed, and functions as described later when the lower mold pressure source 9 and the upper mold pressure source 99 function and compress each other.

The pressing force P ₂ urging downward of the upper mold pressure source 99 (for example, P ₂ = 160 t) is the urging pressure of the blank holder 7 by the gas spring 9 = wrinkle suppression pressure P ₁ (for example, P ₁ = 100 t) ) Is set larger than. As a result, since the pressing force P ₂ of the upper mold pressure source 99 is larger than the wrinkle suppression pressure P ₁ of the blank holder 7, the gap α between the movable upper mold 12 and the upper mold holder 11 is kept substantially constant, Drawing is completed. (FIG. 2 shows completion of the aperture.)

  Next, the press working operation of the press working apparatus of the present embodiment will be described in detail.

(1) Work hold state: Fig. 1
The movable upper mold supported by the upper mold holder 11 when the upper mold holder 11 is spaced apart from the lower mold holder 2 in the upward direction as much as possible, that is, when the ram 2A of the press working apparatus is at the top dead center position. 12 and a lower die punch 1a fixed to the lower die holder 2 are loaded with a workpiece (plate-like material) 6 such as a bonnet outer similar to the conventional one from the direction of arrow (A). The position is regulated by the work stopper 8 on the blank holder 7 and placed on the work holding surface 7 a which is an appropriate position on the blank holder 7. When the placement of the workpiece 6 is completed, the upper die holder 11 is lowered by a predetermined stroke, and is securely held between the workpiece clamping surface 12b at the lower end of the movable upper die 12 and the workpiece holding surface 7a of the blank holder 7. It will be fixed and will be in the state of FIG.

(2) Drawing processing: FIGS.
When the upper die holder 11 further starts to descend from the state of FIG. 1, the upper die pressure source 99 installed on the upper die holder 11 is pushed downward from the pressing biasing force P ₁ upward of the blank holder 7. Since the pressure P ₂ is set to be larger, the blank holder 7 starts to descend by the lowering of the upper mold holder 11, and thereby the drawing is performed by drawing the workpiece 6, holding the workpiece clamping surface 12 b and the workpiece. It is gripped by the surface 7a and proceeds while being brought into contact with and pressed against the drawing surface 1b for drawing and the punching surface 1c for drawing. The drawing is completed at a position where the drawing surface 12a of the movable upper die 12 and the drawing surface 1b of the lower punch 1a are in close contact with each other via the workpiece 6 (for example, 30 mm above the bottom dead center).

(3) Trimming processing: FIGS. 3 and 6
After the drawing is completed, the movable upper die 12 and the upper die holder 11 are subsequently pressed by a pressure (for example, 1000 t) of the press working device larger than the pressing force P _{2 of} the upper die pressure source 99 installed in the upper die holder 11. , The pressure pin 17 acts, the piercing cutting blade 14 built in the movable upper die 12 is pushed down by a distance of S (shown), and the tip end portion 14a of the piercing cutting blade 14 (in this example, The wave shape is in contact with the workpiece 6 supported on both sides of the upper end of the groove portion 3 of the fixed lower die 1 (the upper end is the upper end of the flange molding surface 3a, and the upper end is the piercing support portion 3b). A breaking force is applied, and the trimming process shown in FIG. 3 is realized. The workpiece 6 supported by the upper end sides in the groove portion 3 of the fixed lower die 1 is pulled and broken by breaking due to the contact of the tip 14a of the piercing cutting blade 14 with the workpiece 6.
Thus, the trimming mechanism is completely different from that based on a pair of blade types of an upper blade and a lower blade as in the shearing method.

(4) Flanging processing: FIGS.
As described above, after the trimming process of the workpiece 6 is completed and the main body side 6A and the scrap side 6B of the workpiece 6 are separated, the gap α between the upper mold holder 11 and the movable upper mold 12 is further reduced by SS. The piercing cutting blade 14 is pushed down by the pressure pin 17 while the ram 2A of the press working device is lowered to the bottom dead center. As a result, a flanging process as shown in FIGS. 3 to 4 is realized with the flange forming surface 3a of the lower punch 1 by the bending surface (punching surface for flange forming) 14b of the piercing cutting blade 14. .
In this way, the original three pressing processes of drawing, trimming, and flanging are continuously completed with a single stroke.
4, the workpiece main body side 6A and the separated scrap side 6B of the workpiece 6 are in a state of being attached to the outside of the lower die punch 1a in a ring state because there is no scrap cutter. .

(5) Work removal, scrap removal ... FIGS. 4 to 5
When all the processing is completed, the upper die holder 11 is subsequently raised to a predetermined position on the top dead center side (for example, 30 mm above the bottom dead center) in the process of FIGS. In this state, the movable upper mold 12 performs the stripper function, and the biting of the scrap side 6B with respect to the piercing cutting blade 14 is removed.

(6) Processing completed ... Fig. 5
Then, when the upper die holder 11 eventually reaches top dead center and the operation of the apparatus stops, the work body 6A and scrap 6B are taken out to the outside. As a result, for example, as shown in FIG. 5, a finished product and a ring-shaped integrated scrap can be formed. When scrap is an integral object, separate processing from iron members becomes easier when aluminum is used.

  The present invention relates to a composite press working apparatus that combines a plurality of processes simultaneously in a single press process.

It is a figure which shows the workpiece | work hold state of the composite press processing apparatus which concerns on the Example of this invention. It is a figure which shows the draw molding completion state of the same apparatus. It is a figure which shows the trimming process completion state of the same apparatus. It is a figure which shows the flanging process completion state of the same apparatus. It is a figure which shows the open state of the apparatus. It is a figure which shows the breaking state by the breaking blade 14 of the same apparatus. It is a figure explaining a flange part. It is a figure explaining the conventional press processing apparatus (refer FIG. 1 of Unexamined-Japanese-Patent No. 7-9045).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed lower mold | type 1a Lower mold punch 1b Drawing process surface 1c Drawing punching surface 2 Lower mold holder 2A Ram 3 Groove part 3a Flange molding surface 3b Breaking support part 6 Work 7 Blank holder 7a Work holding surface 8 Blank holder Work stopper 9 Lower mold pressure source 11 Upper mold holder 12 Movable upper mold 12a Drawing surface 12b Work clamping surface 13 Keeper plate 14 Breaking blade 14a Pointed edge (breaking blade)
14b Bending surface (punching surface for piercing cutting blade flange)
15 Spring (gas spring)
16 Wear plate 17 Pressure pin 18a Presser 18b Presser 19 Upper mold 20 Blank holder 21 Lower mold 22 Cutting punch member 22a Upper cutting blade for trimming 22b Punching surface for flanging molding 23 Lower cutting blade for trimming 99 Upper mold Pressure source

Claims (3)

  A press working apparatus that combines drawing processing, trimming processing, and flanging processing in a single pressing process, and includes a fixed lower mold and a movable upper mold. The fixed lower mold is a drawing for drawing. A groove portion through which the molding surface and the piercing cutting blade of the movable upper die are inserted, and a blank holder for holding the workpiece with an upward biasing pressure around the fixed lower die, the groove portion being an inner side in the groove portion It has a flange forming surface for flanging at the upper end and a piercing support portion at the outer upper end in the groove, and the movable upper die corresponds to the tip and the flange forming surface that pierce the trimming portion of the workpiece. A piercing cutting blade having a bending surface, and an upper die pressure source supported by the movable upper die in a state of facing the blank holder and having a downward biasing pressure larger than the upward biasing pressure of the blank holder. Prepared Composite pressing device comprising and.   When the product flange width changes by design along the circumference of the flange surface, the distance between the flange forming surface of the groove of the fixed lower die and the tip of the piercing cutting blade of the movable upper die during trimming is the flange width. 2. The composite press working apparatus according to claim 1, wherein the flange width after machining is set to the designed flange width by changing the circumference along the flange forming surface and installing the piercing cutting blade. . The composite press working apparatus according to claim 1 or 2, wherein a product having a flange width of 3 mm to 14 mm is pressed.

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