JPS5861927A - Draw slit device in continuous press working - Google Patents

Abstract

PURPOSE:To obtain a titled device that prevents cutting of material in drawing and to improve the material yield by forming a plate material to the same shape as the die face preparatorily and after performing specified drawing, further, performing a slit working stage. CONSTITUTION:A draw slit device 21 in continuous press working is constructed of a die 22 consisting of a preliminary forming section 22a, a drawing section 22b and a slide cam mounting section 22c driven by a ram R, a blank holder 23 provided with a preliminary forming section 23a, a slide cam 28 having a cutting edge 31, a blank holder 23 having a cutting edge 27 etc. A plate material N is fed to the direction of arrow A, and formed preliminarily in the preliminary forming sections 22a, 23a, and at the same time, a bead N1, is formed by a projection 22b and a groove 23b. Then, drawing is performed by a drawing section 22b and a punch 26. Further, after forming a slit by cutting edges 31, 27, it is fed to a trim-pierce section (omitted in the figure).

Description

DETAILED DESCRIPTION OF THE INVENTION This invention company relates to a draw-slit type device for continuous press working.

In this specification, continuous press processing refers to a process in which the required processing is performed by feeding the plate material sequentially, continuously, and uniformly into molds for each press process arranged in a series without cutting it, and in the final process, the product is manufactured. This refers to the process of separating the material from the board.

As an example of an apparatus used for such continuous press working, there are apparatuses shown in FIGS. 1 to 3, for example.

In FIG. 1, the lower diagram shows a cross-sectional view of the main part of the mold for each process, and the upper diagram shows the plate material processed by the mold for each process.

M is a plate material such as a steel plate to be formed as a required part. This plate material M is processed while being intermittently fed by a predetermined pitch p in the six directions of the arrows. These devices for continuous press processing include a slit type 1 for drilling a slit M1, a draw type 2 for drawing, and a trim piercing type for cutting the outer periphery of the part and making the required holes and cuts. 3, and a strike/separate cutting die 4 for separating and cutting the part from which the excess thickness on the outer periphery has been cut and removed in order to mold it into the final shape and to release it from the steel plate M.

To explain the molds for each process further, 5 is a die of slit type l, with slits M, , M.

When the die 5 descends, the cutting blades 6.6 cooperate with the cutting blades provided on the lower mold 7 to slit the plate material M) M, , M, to be drilled. After slitting, when the die 5 rises, the plate material M is sent to the idle stage (position indicated by line d), and after the subsequent portion is processed, it is sent to the draw mold 2.

8 is a die of the draw type 2, and the tip of this die has a protrusion 8a that forms a bead M on the plate material when the plate material M is gripped in cooperation with the blank holder 9 supported by the cushion pin 10. is the provision. Further, the blank holder 9 is provided with a groove 9a corresponding to the protrusion 8a. Now, when the steel plate M is sent and the die 8 descends, first the protrusion 8a and the die face around it press the steel plate M against the groove 9a of the blank holder 9 and the die face around it and descend while holding the steel plate M. The steel plate M is drawn so as to be lower than the upper surface of the punch 11 and has a shape as shown in FIGS. 2 and 3. M is a bead formed by being engaged by the protrusion 8a and the groove 9a.

The part drawn in this way is moved to a -tan idle stage (
It is sent to the position shown by line e) to perform the next processing, and when that processing is completed, it is sent again by the pitch p and comes to the position of the trim piercing mold 3.

Reference numeral 12 denotes a die of a trim piercing type 3, and a pad 13 provided on the die 12 presses a portion M3 processed in the drawing process of the plate material fed through a spring onto a lower die 14, and the die 12 is further lowered. Then, using the cutting blade 15 attached to this die, the excess thickness including the bead portion M of the portion M is cut and processed into the shape M4.

In this way, the portion M4 from which the excess thickness has been cut is sent to the idle stage (the position indicated by line f) by feeding the plate material by the pitch p, where it is subjected to the next processing.
When the processing is completed, it is further fed by a pitch p,
Restrike: Come to the separate cut type 4 position.

It is a +6Fi restrike/separate cut type 4 die, consisting of a restrike part 16a and a separate cut part +6b. I7 is a flange-up die attached to the restriking part i6a, which processes the flange part of part M4 of the plate material mounted on the lower mold 18 by lowering the die 4 to form part M5, and also processes it into part M5 in the next process. The part M is cut from the plate material M by the cutting blade 19 attached to the separate cutting part +6b and the cutting blade 20 provided on the separating cutting blade and the lower die 18, which are not shown in the figure.

is cut off to obtain product M6.

In the figure, M is a scrap that is cut at the same time as the product M6 is cut.

Note that the dies of the molds for each of the above-mentioned steps are each attached to the ram R, and the lower molds are each fixed to the bolster B.

However, in such conventional continuous press processing equipment, in the pre-process of the draw die, it is necessary to drill slits in the plate material in addition to continuous press processing including drawing. Since a slit mold had to be provided in the pre-processing process of the mold, and slits were made in two places on the front and back of the part to be molded, an extra width of the plate material was required, including the bead part, which increased the cost of cutting. !
There was a problem with poor alignment.

This invention was made in response to these conventional problems, and the slit mold in the conventional equipment was abolished, resulting in a two-step process, but one mold was used for preforming and drawing. The die has a draw-slit type configuration, and the die has a drawing part having a die face, a preforming part having a Gui face having the same shape as the Mi+ Gui face, and a slide. A cam attachment part is formed in the order of a preformed part, a drawn part, and a slide cam attachment part in the feeding direction of the plate material, and the blank holder has a die ace of the drawn part of the die and a cam attachment part of the preformed part. A die face corresponding to the die face is formed, a slide cam with a slitting cam attachment part and a cutting blade for slitting is attached to the blank holder, and a cam for moving and positioning the slide cam during drawing is attached to the blank holder. This problem is solved by installing a cutting blade that forms a surface and cooperates with the cutting blade to slit the plate material.

Hereinafter, this invention will be explained based on Figure E.

4 to 7 are diagrams showing an embodiment of the present invention. First, the overall configuration is the same as the conventional valley process configuration described above.
Instead of slit type and draw type.

Draw slit mold 2 having a preformed part according to the present invention
1 is arranged. In FIG. 4, 31 is a preforming section, 32 is a drawing section, 33 is an idle stage, and 3
Reference numeral 4 indicates the position of the trim piercing portion, 35 the idle stage, 86 the beam strike portion, and 37 the separate cut portion.The idle stage 33 and subsequent parts are the same as those of the conventional example shown in FIG. 1, so the explanation thereof will be omitted.

The structure of the draw/slit mold 21 will be explained with reference to FIG. 5. 22 is a die, and a preforming part 22a, a drawing part 22b, and a slide cam attachment part 22c are integrally formed in this order in the sheet material feeding direction. are doing.

23a is a preformed part of the blank holder 23, and its upper surface including the die face corresponds to the face surface of the preformed part 22a of the die 22, and the plate material N is shaped into a die face shape that is the same as the die face shape in the next drawing process. In addition, a linear projection 22d for forming a bead N on the plate iN is formed at a portion of the preforming portion 22a near the drawing portion 22b, and a linear protrusion 22d for forming a bead N on the plate iN is formed on the blank holder 23 side. A linear groove 23b corresponding to the projection 22d is formed in the preformed portion 23a.

Reference numeral 24 denotes an auxiliary nail/pin supporting the blank holder 23, which is fixed to the blank holder 23 by a plate 25. 24a is an air cushion bottle normally attached to a press, and its upper end is connected to an auxiliary cushion pin 24.
is in contact with the bottom edge of.

On the die face surface of the flank holder 23 opposite to the preformed part, there is a glue-like Ts23b provided on the preformed part 23a.
There is a Th27a with the same shape as #127a.
A linear protrusion 22e corresponding to the is provided on the die side, and when the preformed plate material is fed by a predetermined pitch, the bead N formed in the preforming process is fitted into the groove 27a.
The bead N is suppressed by the protrusion 22e.

Note that a cutting blade 27 is provided outside the groove 27a.

A punch 26 is fixed to the bolster B, and when the die is lowered, it cooperates with the drawing part 22b of the die to draw the preformed plate material N.

A slide cam 28 is slidably attached to a wear plate 22f fixed to a slide cam attaching portion 22c of the die 21, and an elastic member 29 is interposed between the slide cam 28 and the die 22. That is, the slide cam 28
is always biased 400,000 times as indicated by the arrow by the elastic member 29, but its sliding amount is regulated by a stopper plate 30 fixed to the end of the slide cam mounting portion 22c. Further, the slide cam 28 has a slope 28a formed at its lower end, and slides while compressing the elastic body 29 by colliding with the slope 23d formed on the blank holder side when the die 21 is lowered. A vertical surface 23e is formed following this slope 23d, and these slopes and the vertical surface constitute a cam surface 23f. Note that the clearance between the cutting blade 31 and the cutting blade 27 is set to be the optimum clearance for slitting when the vertical surface of the slide cam 28 is in contact with the vertical surface 23e of the cam surface.

Next, the action will be explained.

When the ram R to which the die 21 is fixed is rising, the blank holder 23 rises by the amount of the cushion stroke and becomes approximately at the same height as the punch 26. At this time, the plate material N is fed in the feeding direction in FIG. portion 22d and preformed portion 23at of blank holder 23
i.

The plate material N is preformed into the same shape as the die face shape in the drawing section.

Next, when the die 21 is raised, the slide cam 28 also moves towards the die 2.
1, the blank holder 23 is also pushed up by the cushion bin 24, and rises to the height of the punch 26.

Next, the plate material N has a pitch of a predetermined feed length, that is, a bead I
When the bead N formed by the protrusion 22d of the preform part is fed in the feeding direction by the length p between 'J and -N, the bead N formed by the protrusion 22d of the blank holder is fed to the position where it engages with the groove 27a of the blank holder, and at the same time the preform Plate material N preformed into die face shape at section
The portion is sent to the drawing section 22b and placed on the punch 26. Then, when the die 21 descends, the preformed portion of the plate material N is tightly placed on the die face of the blank holder.

Because it is placed in the same position, it has been well drawn to form a shape
, becomes. During this drawing process, the cutting blade 31 for the slit
Since the slit N is formed by the slit N, the material flows into the drawing part from the side where the slit has been processed, and a good drawing process is performed.

After the die 21 rises, it is sent to the -tan idle stage, and then to the next trim/pierce mold, and thereafter undergoes the same steps as in the conventional example.

As shown in FIG. 7, only one bamboo slit is processed at the same time during the drawing process, so it is clear that the yield is improved.

As described above, according to the present invention, the die includes a softening part having a die face, a preforming part having a die face having the same shape as the die face, and a slide cam. The mounting part is the preforming part and the drawing part in the feeding direction of the plate material.

The slide cam attachment part was formed in this order, and the blank holder was formed with a die face surface corresponding to the drawing part of the die and the preforming part, so that the blank gripping surface that was most suitable for drawing was formed in the preforming process. can be applied to the plate material, and the quality of the product by drawing can be improved by 1 mm].In addition, a slide cam with a cutting edge is attached to the slide cam mounting part, and the blank holder is
In addition to forming a cam surface that moves and positions the slide cam during drawing processing, a cutting blade that works with the cutting blade to slit the plate material is attached, so that it is easy to see from the side where the slit is made during drawing processing. Material flow is sufficient,
It is possible to prevent material cutting, which tends to occur during drawing, and since there is only one slit location, the material yield can be improved accordingly.

[Brief explanation of the drawing]

Figure 1 is an explanatory cross-sectional diagram of the main parts of the mold for each process used in conventional continuous press working and an explanatory diagram of the processing state of the plate material, Figures 2 and 3 are partial explanatory diagrams of the plate material during the process, and Figure 4 is the main part of the mold for each process used in conventional continuous press working. FIG. 5 is a cross-sectional view of a main part of a continuous press processing apparatus according to an embodiment of the invention, FIG. 5 is a cross-sectional view of a main part of a draw-slit type apparatus according to an embodiment of the invention, and FIGS. FIG. 22...Die 22a, 23a...Preformed part 22b...Drawing part 22c...Slide cam attachment part 26...
..... Punch 28 ..... Slide cam 81 ..... Cutting blade 2 for slit which is the cutting blade
3b, 27a--Groove portion 21... Cutting blade 23... Blank holder 23f...
・・Cam and N・・・・・・・・・・・・Plate material

Claims (1)

[Claims] A die, a punch, and a blank holder are provided, and the die is provided with a drawing section having a die face, a preforming section having a dia ace having the same shape as the die face, and a slide cam mounting section. A preformed part, a drawn part, and a slide cam attachment part are formed in this order in the feeding direction of the blank holder, and die faces corresponding to the die faces of the drawn part and the preformed part of the die are formed on the blank holder. A slide cam equipped with a cutting blade for slit processing is attached to the slide cam mounting portion, and a cam surface for moving and positioning the slide cam during drawing is formed on the blank holder, and a cam surface for moving and positioning the slide cam during drawing processing is formed on the blank holder. A draw-slitting device for continuous press processing, which is characterized by being equipped with a cutting blade that slits a plate material in cooperation with the cutting blade.