DE1961568A1 - Press and method for punching sheet metal parts from strip material - Google Patents

Description

1. Alexandr Ivanovich Fedorov, Engineer, USSR, Novgorod,

ulitea Leningradskaya, 29 kv.

2. Igor Alexandrovich Bogordsky, engineer,

USSR, Novgorod,

ulitsa Leningradskaya, 29 »kv.

3. Nikolai Petrovich Vedeneev,

USSR, Novgorod,

ulitaa Leningradekaya, 29 »kv«

4- Yakov VuIf ovich Borovinsky,

Engineer, |

USSR, Novgorod, *

ulitea Leningradekaya, 29 »kv«

5th jury Alexeevich Prokofiev, engineer,

USSR, Novgorod,

ulitsa Sadovaya, 4, kv

6.Mikhail Ivanovich Belov, Technician"

USSR, Novgorod, lii Khimikov, 15, kv

UV & TBRVAHRBlr to the mufim from blbchteilbh auö- TAPE MATERIAL The present document refers to the Production of 8 ton parts, mainly Tran -

formator sheets, made of strip material.

Be % 0k known, for cutting Transfonxatorbleohen

from tape material Preeaen "where the stamps for Butenauasohnltte with ibsehneldeatempel »to separate the finished cutting lines are rigidly connected to each other and only "operated" together.

The lerkateff band becomes fohrittwelse with these feeders

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advanced by twice the length of the finished cut piece, and in a tool companionway, both the groove cutouts and the finished sheets are punched separated.

With such a working method, only one of the two cut parts can be passed through the tool opening let fall through, while the other cut part is pushed out of the cut and along a provided for this purpose Bevel is led away.

This fact complicates the stacking of finished products Sheet metal parts, as the sheet metal pieces come off the cut bevel in a disordered manner. One proceeds in such a way that one does this Before they reach the stacking position, the sheet metal pieces are aligned by hand and only then by a belt conveyor can be fed to the stacking devices with gutters and strips.

It should also be mentioned that these stacking devices work quite unreliably and are constantly monitored require by the operating personnel.

It is the aim of the invention to eliminate these disadvantages of the known punch presses.

The invention is based on the object of further developing the punch drive so that both workpieces can fall through the tool breakthrough .

The task at hand is punched out by a preeat

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VAGINAL INSPECTED

of sheet metal parts, mainly transformer sheets Band material released, in which the cut has punching and cutting punches arranged one after the other. According to the invention, the punch and the cutting punch have independent ones Drives that are designed in such a way that the number of strokes of the cutting punch is twice as large as the. .". · the Hole punch and that the working stroke of the hole punch with one of two working strokes of the cutting punch time- " loan coincides.

When the press is trained in this way, the Cut parts in a precisely defined position and the stacking devices can be attached directly to the cut. This enables the finished sheet metal parts to be immediately after cutting, i.e. stacking without any intermediate transport.

The stacking devices are expediently arranged under the stamps. In this case you always put | a vertical cassette inserted into a special groove in the section baseplate β. This cassette has a sliding baseboard that adheres to its walls by means of friction elements.

The independent movement of the cutting punch lets the Installation of limit stops to avoid feed errors in one of the punch plates.

According to the invention, these attacks are in the form of pointed search pens below. You will be

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cutting die plate successively attached that the distance between their outwardly facing surfaces is equal to the length of the cutout hole, while the distance between their facing surfaces the web width between the holes is the same.

With such a structure of the press, the workpieces manufactured in a process according to which the material strip first punched and the finished cut parts cut off into the press with gradual tape feed will. According to the invention, the strip of material is used for each Feed step shifted by one cut length, the holes cut out after every feed step

to the

and the finished parts are separated with a cutting punch after each feed step.

The idea of the invention is illustrated below using a specific

the

th explained embodiment with reference to ^v accompanying drawings. It shows

1 shows the press according to the invention for punching transformer sheets in an overall view,

FIG. 2 shows the transmission plan of the press according to FIG. 1 with a cam disk drive ,

Fig. Jj> the cutting tool of the press in vertical section,

Fig. 4- the sectional lower part in plan view,

5 shows a stacking device with a drive linkage,

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ORIGINAL INS

5 Fig. 6 shows the view in the direction A to Pig. 5 »

Pig. 7 a cassette for B-shaped sheet metal pieces in Vertical section,

8 shows a cassette for rectangular sheet metal pieces in vertical section,

9 the same cassette in plan view,

the pig. 10 the material tape in the position, ^v after *

the simultaneous decline of the punch and the cutter results,

Pig «11 the material tape in the state after

only
GangV of the cutting punch.

As can be seen from the drawings, the face initially contains a frame 1 with a face table arranged on it 2 with cut base plate J. Cut 4 is mounted on base plate 2. The latter sits down from a fixed lower plate 5 (Pig · 2,3) »

<the one cutting die 6 and one cutting die 7 carries, and two movable die plates 8, 10, which correspond to the cutting punch 9 for separating the finished

the

Workpieces from the material ^{tape and v} hole punch 11 for cutting the groove cutouts (holes) carry together.

Under the cutting punches 9, 11 are on the base plate 3 stacking devices 12, 13 available. The device 12 is used to stack E-shaped bleoh pieces and

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represents a vertical cassette which is inserted into the groove 15 of the base plate \ '$ under the die. 7 The cassette is in a press drive operated carriage 16 (described in more detail below).

The task of the stacking device 13 is to collect rectangular pieces of sheet metal that occur during hole cutting. she also represents a cassette 17 and finds its place under the die 6 in a groove 18 in the base plate 3.

The cassettes 14, 17 each have a horizontal bottom bar 19 (Fig. 7 »ö), which by friction elements 20 to the cassette walls is held.

In addition to the cutting punch, the punch plate 8 carries

search pins 21 pointed at the bottom (Fig. 3). They lie one after the other and are arranged so that the distance between their outwardly facing surfaces corresponds to the length of the cutout 22, while the distance between their facing side surfaces of the width of the web 23 (Fig. 10, 11) between the adjacent successive punched cutouts 22 and 22a is the same.

The press frame also carries a tape feeder 24 (FIG. 2) for conveying the material tape 25 into the cut. This device consists of a bracket 26 with guides 27 on which a carriage 28 with a band clamp 29 sits. Another band pliers 30 is located on the book 26 and has the task of holding the workst off band 25 when the carriage 28 declines (idle).

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The main part of the press drive is a shaft 31. It is driven by a motor (not shown in the drawing) arranged in the press frame 1 and carries several cam disks (FIG. 2). The cam disk 32 drives the punch plate 8 together with the cutting punch 9 via a rocker arm 33, which perform a downward and upward movement. In the same manner, the stamp plate including IO% punch 11 is actuated by the cam 34 via rocker arms · 35th Since the cam 32 has two lugs, while

34
rend the cam disc ^ has only one of them, the punch plate 8 including the cutting punch 9 covers twice the number of strokes of the punch 11 in the same time.Another cam disc 36 sitting on the drive shaft 31 drives the carriage 28 via rocker arms 37, whereby this on its guides 27 is moved back and forth in the horizontal plane. The band tongs 29 on the carriage 28 is of

the cam 38 actuated from via lever 39 while the pliers 30 holding the material strip during the feed carriage return from the cam disk 40 via levers is driven.

The reciprocating movement of the carriage 16 with cassette 14 in the transverse direction to the material strip is brought about by a cam disk 42 (Fig. 5), which also sits on the drive shaft 31 and is connected to the carriage 16 by the linkage 43 »44.

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ORIßlMAL IMGr

The press described has the following mode of operation.

The material band 25 (Fig. 1) is unwound from the roll 45 and inserted into a device 46, which it unwinds from the roll 45 and continues. The leadership take on special guide roles within the device 46. The tape end is further in the tape feed 24 (Fig. 2) pushed in up to the approach stop 47 (Fig. 4), where a loop, the so-called compensation loop, is always left hanging at the entry into the belt feed the disruptive influence of the tape tension on the accuracy of the tape feed in the cut and on the function to avoid the whole press.

After the material strip has been pushed in as far as the stop 47, the press is switched on while at the same time Lifting off the rocker arm 39 from its cam disc for a stroke. The automatic tape feed is here still and the punch 11 cut two bead-roping cutouts 22 (FIG. 11) in the material strip, the rectangular pieces of waste remain in the die 6. The punch 9 performs an idle stroke. One lets now the press once again cut the openings 22 in the non-automatic mode of operation and pushes them on the strip of material up to the next approach stop 48. The press is then switched on again for a single stroke.

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The punches 11 cut two more parallel ones Holes 22a from, while the punch 9 covers an idle stroke again. Now the rocker arm 39 is in contact with brought its cam 38 and the press is switched to automatic operation.

The pliers 29 clamps the material strip in the extreme right position of the feed carriage 28 and pushes it it when the driven by the cam 36 moves Carriage 28 to the left by the specified stride length in front of the cut. The stride length is in the present case chosen equal to the length of an E-shaped piece of sheet metal.

d At the moment when the band position is reached, the search pins 21 engage in the two pre-cut holes 22 (Fig. 11) and thus locate the band exactly in the position in which the over the cut edge of the die 7 (Fig. 3) The length of a B-shaped sheet metal piece is the same as the length of a protruding band end. *

The search pins 21 bring with their pointed ends the strip of material in the only correct position opposite the cutting edge of the die 7. That stated The strip of material is additionally pressed against the block 26 of the strip feed by the tong arm 30. Shortly thereafter the feed carriage 28 moves to the right with the tongs 29 open, while the stamp plate 10 with Suohstifte 21 and the stamp 9 her ^ decline or working stroke continued

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set. The punch 9 cuts the e% te E-shaped piece of sheet metal and pushes it into one of the compartments of the cassette 14. The stamps 11 stand still. When moving upwards of the punch 9, the carriage 16 moves, driven by the cam disk 42 via linkage 43, 44, and below the die? the other compartment of the cassette 14 comes to a standstill.

After reaching the upper starting position of the stamp 9, the belt feed 24 moves the material 25 in one go Advance step by the length of an E-shaped piece of sheet metal, and the punch 9 carries out its second working stroke while he separates the second finished E-shaped sheet metal piece from the material strip and into the other department the cassette 14 pierces. The cassette 14 is at this moment together with the carriage 16 from the cam disk 42 brought into the right position.

This time, however, in addition to the cutter 9, also work the punch 11 down and cut out two parallel holes 22a in the material strip. The waste pieces 50 remain back in the die 6 and represent rectangular sheet metal parts.

The plague of the "Verkstoffband" before the simultaneous The decline of punches 9 and 11 takes place through the search pins 21, which engage in the pre-cut holes 22, as can be seen from FIG.

After reaching the lower end position, the punches 9 »

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- li -

11 back to its upper position, wherein the cam 42 adjusts the cassette 14 again, so that their first Department to stand under the breakthrough of the die 7 again comes.

The above was the sequence of action of the individual devices the press described during one drive shaft revolution. During one revolution of the shaft, the strip of material becomes pushed forward twice, the punch 9 "cuts off two E-shaped pieces of sheet metal and the locating pins 21" twice the tape tightly, once the web position between the one after the other in the direction of tape movement Holes 22, 22a and the other time only the position of the holes 22 is used for tape alignment. The stamp U go downwards only once during the one revolution of the shaft. This is due to the fact that the profile curve of the cam 56 has two elevations, while the profile curve of the Cam 34 has only one of them.

During the operation of the press in the mode of operation described above, the E-shaped sheet metal pieces arrive alternately in the two compartments of the cassette and stacked here in order to form two packages. The movable one Slidable baseboard 19 slowly goes down under the weight of the sheet metal pieces.

The rectangular pieces of sheet metal remaining in the die 6 are pushed down by punches 11 and stacked, the baseboard 19 gradually sinks.

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At the moment when the cassette 14 or 17 with the Cut parts is filled, actuate the bottom strips 19 (Fig. 7 »8) limit switches (not shown in the drawing), which cause the press to stop. The full cassettes are manually exchanged for empty ones, and the press is switched on again in automatic mode.

The few pieces of sheet metal that get stuck in the cut are secured against falling out by a spring-loaded hurry ball 49 (Fig. 3) while the cassette is being replaced. The compensation loop of the material strip is monitored by a photocell (not shown in the drawing) which influences the device 46. If the loop length is insufficient, the photocell accelerates the unwinding of the tape. It also turns off the press when the tape runs out.

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Claims (5)

PATENT CLAIMS: ( 1Λ press for punching sheet metal parts, mainly transformer sheets, from strip material, in which the cut contains consecutive punching and cutting punches, characterized in that the punching punch (11) and the cutting punch (9) are moved independently of one another by drives that are so are designed that the number of strokes of the cutting punch (9) is twice as large as the number of strokes of the punch (11) and that the operation of the punch coincides with one of the two operations of the cutting punch. 2. Press according to claim 1, gekennze rejects by stacking devices (12, 13) for cut parts, which are arranged under the punches in the punch base plate (3) and one each inserted into a groove in the cut base plate (3) Cassette (14, 17) with horizontal bottom bar (19), the latter on the cassette walls (20)
adhered by friction elements. 3. Press according to claim 1, characterized by un £ en pointed search pins (21) on the section die plate (8) are arranged successively so that the distance between their outwardly facing side surfaces Is the length of the holes cut out in the material tape, 00934A / 1109 196156c while the distance between their mutually facing side surfaces of a web width between the successive cut holes (22, 22 a) is the same. 4. Press according to claims 1 to 3 »characterized by a receiving cassette (14) for prefabricated parts with two receiving chambers and a drive (42, 43 »44» Fig. 5) »which alternates the chambers brings under the die (7) of the final cut. 5. Process for cutting sheet metal parts, mainly transformer sheets, from strip material with the press according to claims 1 to 4, after which holes are first cut in the material strip and then the finished cut parts are cut off with step-by-step tape feed into the press, characterized in that that the material tape after each decline of the cutting punch is advanced and that the step length is the same as the length of the finished cut parts. 0Q98U / 11Q9 '«W Blank page