DE1230290B - Double pressure press for the production of tubular rivets and similar perforated parts - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

Number:
File number:
Registration date:
Display day:

B21k

German class: 49 i - 6

1230 290
T 214911 b / 49 i
January 26, 1962
December 8, 1966

The invention relates to a double pressure press for producing tubular rivets and the like Perforated parts, starting from blanks of a predetermined length, with a male carrier attached to the slide in a transversely movable manner for a first Male part and a ready-made immersion male part with a longitudinally movable female part arranged opposite and a piercer protruding into the die space, with support means for the die opposite the die carrier part of the double pressure press, which holds the die in its front position hold during the insertion stroke of the blank and retrieve it again after the finish upsetting, and means for Limitation of the die stroke in both directions, with a punch drive for the ejector and return stroke movement and a fixed piercer position during the insertion stroke, furthermore with a conveyor and a stripping device, all movements synchronously on the Double pressure cycle, derived from a main drive, are matched (USA.-Patent 2 396 995).

In the case of such double pressure presses, the head of the blank is preformed on the first blow made, the piercer supporting the blank from behind and possibly notches something. With the second stroke, the so-called finished plunge stroke, the head is completely shaped, and in addition, the hollow shank is made by the piercer, which is then the finished Partial hollow rivet or the like lifts out of the die.

In a known case, the hollow shaft is formed in one that is fixed in both strikes Die. Here, the piercer must during the final upset impact or immediately after it advance to produce the hollow shaft, the head of the hollow rivet on the Ready-to-go stamp supported, which is lifted by the displaced amount of material. Then he sets Lochdorn continues its movement to excavate the completed tubular rivet. This is where the manufacture takes place of the hollow shaft, however, no longer in a fixed die space, but in connection with the lifting movement of the finishing plunger from the die; this is the flow rate of the material no longer strictly controlled, which does not allow a tight shaft length tolerance.

In another known case, the punching takes place against a fixed piercing mandrel, the receiving die instead receding. But at the same time the head is shaped from the rough dimensions, so that there is no guarantee that, when producing the various rivets, a double pressure press for producing
Partial tubular rivets and similar perforated parts

Applicant:

TEXTRON INC., Providence, R.I. (V. St. A.)

Representative:

Dr.-Ing. F. Wuesthoff, Dipl.-Ing. G. Pulse

and Dr. E. Frhr. ν. Pechmann, patent attorneys,

Munich 9, Schweigerstr. 2

Named as inventor:
Erwin B. Byam, Wolcott, Conn .;
Anthony K. Undraitis,
Waterbury, Conn. (V. St. A.)

Claimed priority:

V. St. v. America January 27, 1961 (85 251)

deformed the same amounts of material for the heads and also the same amounts of material for the shafts will. It follows from this that here too there are no tight tolerances, in particular of the shaft length can be complied with.

The invention is now intended to solve the problem of hollow rivets or the like with the tightest possible dimensional tolerances to manufacture. For this purpose, it is provided according to the invention that the die by on the support means attacking blocking means that can be swiveled in and out can be fixed in their positions so that the male insert, as known per se, designed as a head pre-upsetting male and the piercing mandrel, as well known per se, is held stationary via its ejector drive.

The invention thus solves the problem in principle by combining one design feature of the two well-known double pressure presses. On the one hand, an exact fixation of the Starting point of the head of the hollow rivet on the shaft obtained by the fact that the pre-upsetting impact Die is held stationary in a front position and because of the support of the blank through the piercer a precisely determined amount of the protruding blank from the pre-upsetting punch the face of the die is placed. On the other hand, when manufacturing the hollow shaft of the known Made use of the principle that the hollow

609 730 / 14S

3 4

Shank shaping takes place exclusively in the die space In the rear end of the sleeve 22 is a short boI

takes place in that the die is held against the stationary or installed a rod 24 which, according to FIG. 1

NEN punch backs away. In the first step a head 25 carries, on which the elongated

the head section 26 of the die control member 27 will always hit the same amount of material,

shaping and the shaft shaping assigned, and in 5 The control element 27 is together with its long

second operation ensures that the section 26 in part of the supporting structure

Available amount of material arranged in a narrow and movable way and is from one

Limits predetermined shaft length is transferred. Sleeve part 28 enclosed in which the control

It is advantageous when pre-compressing which organ can rotate.

the amount of material determines, a conical head ίο According to F i g. 7 carries the control element 27 on his

to strive for form. rear end face several extensions 30, which by

The invention is illustrated below with reference to the cutouts 31 which are separated from one another. With the

Table drawings of an embodiment control member 27 works according to FIGS. 2 and 3 a

explained in more detail. sleeve-like plug part 32 together, the

F i g. 1 is a vertical section through one of its front end faces, likewise several, in

according to the invention designed upsetting machine; Extensions 33 distributed around the circumference (FIG. 8)

F i g, 2 is a horizontal section along the carries, and the extensions 30 of the. Control member 27 and

Line 2-2 in Fig. 1; the extensions 33 of the plug part 32 are so arranged

F i g. 3 shows details of the mechanism for the net that they can face each other and

Controlling the die, the parts being that position 20 that the control member 27 can be rotated so that

position, in which the die moves after the extensions of one of the two parts into the

moved behind; savings between the appendages of the subject

F i g. 4 is a larger-scale engaging other part. If the extensions 30 and

Longitudinal section through the die, and it shows the points 33 facing each other, thus becomes the sleeve

ment of the tools during the preparatory, 25 22 held in their front position so that they the

conical upsetting of the workpiece; Die 14 in its front position and in contact

F i g. 5 shows the position of the tools while holding on to the shoulder 16 as shown in FIG. 4 shown

the second or last work step in which is; when the control member 27 is in its position after

Course of the head of the workpiece completed and F i g. 3 is rotated, the extensions 33 of the

the body of the workpiece is punched; 30 recesses 31 added so that the Ma-

F i g. 6 shows the position of the tools during trize in their in FIG. 5 is the rear position

the lifting of the finished workpiece from the path.

Die and leaves the mechanism for stripping It should be noted that the die is affected by the pressure

recognize the workpiece from the piercer; is moved backwards, which is caused by the

Fi g. 7 shows details of the movable lever ₃₅ upsetting die is applied when the

for adjusting the die in the die bed; Control member 27 in its position according to FIG. 3 located

F i g. S is an end view of the with the control and that means are provided around the die

organ of Fig. 7 cooperating stop in its front position. This means

organs; include according to FIG. 2 and 3 a pressure pin 35,

FIG. 9 is a partial section along the line 9-9 in FIG

2 and shows the mechanism for stripping with its front end on the control member 27

of the workpiece from the piercer. supported, while its rear end on a block

The upsetting 36 shown in the drawings attacks, which is built into a support member 38

The machine has a substructure 10 on which a guide rod 37 can be displaced. On the lead

Die bed 11 is arranged. Springs 39 are pushed onto a surface of the grooming rods 37, which

Trizenbetts carries a die block 12, in which act on the block 36 according to the pressure pin 35

4, 5 and 6, a die holder 13 is built in to bias it towards the front against the control element 27

in which the actual die 14 with a and so the sleeve 22 and the die to the front

Die opening 15 is movably arranged. move. The springs 39 are supported with their Mn

The die holder 13 has a shoulder 16, and 50 direct ends on a stop plate 40, which on

the actual die 14 is secured to a guide rod 37 connected to it by nuts 41

cooperating shoulder 17 provided, is held by.

which limits the forward movement of the die According to FIG. 1 is a plunger 45 on the bed of the

will. The die holder 13 has near its rear double printing press arranged displaceably;, the

ren end an inwardly projecting flange 55 tappet can be reciprocated by a crank arm 46

18, which acts as a stop and moves the movement, which is eccentric on a shaft 47

Die limited in the opposite direction. is stored; the shaft 47 is suitably

The back of the die holder can be attached to z. B. via a pulley 48, driven. on

A punch carrier 50 is vertically connected to an abutment 45 arranged in the die block 12.

Support the stand ring 19. 60 sliding; there are two male molds on the punch holder

In the die block there is a stepped 51 and 52 attached, which during the lifting movement

Sleeve part 20, the front face of which on the back of the ram 45 alternates with the die 14

Direct face of the die 14 is applied. It is also necessary to work together. According to FIG. 4 the patrix is used

a long sleeve 22 is provided, which extends on the 51 to upset the workpiece 53 partially

teren end face of the sleeve part 20 is supported and 65 or to provide it with a conical head and

extends through the die bed; this sleeve 22 is a short distance against a still to be described

on its upper side with a longitudinal opening 23, the piercing mandrel 67 can be moved; the male part 52 is used

see the one yet to be explained. Purpose serves. to finish the head of the workpiece and

the workpiece together with the die to press back against the piercer that the metal of the blank backwards along the piercer is pressed to create a hollow section on the workpiece.

To move the male molds are arranged on the punch carrier at a distance from one another Guide pieces 54 are provided, and a block 55 is displaceable between these guide pieces, which is articulated at 56 on an arm of an angle lever 57 mounted on the substructure at 58. With the the other arm of the angle lever is a link part 60 articulated at 59; the backdrop part carries in a distance from each other mounted movement pick-up rollers 61, on which one eccentrically on can engage a cam 62 arranged on a shaft 63; the shaft 63 is with the help of a so connected gear 64 driven, which with a seated on the drive shaft 47 gear 65 combs, as is known per se.

When the shaft 47 is rotated, therefore, the crank arm 46 reciprocates the plunger 45, and the stamp carrier 50 is also synchronized with this movement by the angle lever 57 moves vertically up and down to alternate with the successive strokes of the ram align one punch and then the other with the die. The backdrop 60 can through a sliding block 66 mounted on the shaft 63 can be guided.

According to FIG. 2 and 4 to 6, the piercer 67 is arranged within the offset sleeve 20, and it extends forward so that its free end protrudes into the die opening 15. The piercer

67 may be shaped in the manner shown, but it may also have any other suitable shape, as they are usually provided to by a pressing process a tubular portion on the workpiece to create. The piercer is on a pole

68 worked, which is slidable in the sleeve 22, and the rear end of the rod 68 is supported on a plug part 69, which is also displaceable in the sleeve 22, the rear end of which goes so far protrudes behind that it is under the opening 23 in the Sleeve 22 lies. A lever 70 mounted on the supporting structure at 71 protrudes into the slot 23, and a nose 72 of this lever engages the rear end of the plug part 69. The back end of the Lever 70 also carries a second nose 73, which when the piercer is in its rear, normal Position according to FIG. 2 is located, rests against a stop screw 74 built into the supporting structure. The setting of the stop screw determines the rear limit position of the piercer, and you can adjust the screw to adapt to workpieces or raw parts of different lengths. At the upper arm of the lever 70 above its bearing axis 71 engages a push rod 76, which through a spring 77 is biased forward; the spring 77 normally pushes the tab 73 of the lever against the stop screw 74.

For ejection or excavation, the piercer is used according to FIG. 2 by means of a slide 78, the is movable in a housing 79 attached to the die bed, pushed forward; the slide 78 is provided with an adjusting screw 80 which engages the upper end of the lever 70. The under spring tension standing rod 76 holds the lever 70 in contact with the head of the adjusting screw 80. At 81 is on the Slide 78 articulated a rod 82, the other end of which is articulated according to FIG. 1 with an angle lever 83 is connected. The angle lever 83 is mounted at 84 on the substructure, and he carries at the end of his second arm has a motion take-off roller 85, which is eccentric to the already mentioned Shaft 63 arranged. Cam 86 cooperates. The slide 78 thus moves the nose 72 of the lever 70 forward to advance the piercer 67, so that this the workpiece in time coordination with the movement of the ram 45 from the die 'ejects. The gears 64 and 65 are dimensioned so that the gear 64 performs one revolution, while the gear 65 two revolutions executes so that the ram 45 executes two strokes, in the course of which two operations are carried out on the workpiece before ejection takes place from the die.

Like F i g. 1 and 9 show, a stripping member 87 is formed on a lever 88 which is mounted on the substructure at 89 in the vicinity of the Mafrizenkockes so that the stripper 87 from its position shown in Fig. 9 in solid lines into the position indicated by dash-dotted lines Can be pivoted position in which it faces the opening of the die 14. A gripping finger 90 is mounted on the stripper 87 at 91, and the end of this finger carries an extension 92 which cooperates with a recess 93 in order to be able to grasp the blank. The gripping finger 90 is biased counterclockwise with respect to its bearing axis 91 by a spring 94 built into the stripper 87. The end of the lever 88 is shown in FIG. 1 articulated to a rod 95, which is connected to one end of a further rod 97 by an angle lever 96 mounted on the substructure, the other end of the rod 97 is articulated to one end of a lever 98, the other end at 99 on the substructure is stored. The lever 98 carries a motion take-off roller 100 which is held in contact with a scraper cam 101 arranged eccentrically on the shaft 63; for this purpose a spring 102 is provided, the ends of which are connected to the lever 98 or the substructure. In this construction, the scraper 87 is pivoted once about its bearing axis 89 in the course of two revolutions of the shaft 47, while the plunger 45 performs two back and forth movements. In Fig. 6 of the piercing mandrel 67 has been moved by the slide 78 and the lever 70 forward ,, and the workpiece 53 b was ejected from the die after it has been compressed. The stripper 87 has been pivoted into its position, indicated by dash-dotted lines in FIG. 9, in which it faces the workpiece, and has grasped the workpiece between the extension 92 and the walls of the recess 93.

At this point in time, the slide 78 is in accordance with FIG. 2 withdrawn to the right, so that the push rod 76 moves the lever 70 into its position according to FIG. 2 in which the nose 73 of the lever rests against the end of the stop screw 74. The piercer is thereby compared to the die 14 by the according to FIG. 1 stored at 106 on the substructure Lever 105 withdrawn to the left or inwards. The lower end of the lever 105 engages in a recess 107 in the pressure pin 68

Claims (1)

7 8 a. At the upper end of the lever 105, an aid of the separating element 112 is cut off and engages in front Push rod 108, which according to FIG. 1 brought through a die. The parts of the device beFeder 109 is biased to the right, so that these are found here in their position according to FIG. 2, and Spring is the actuating force for retracting the from FIG. 1 visible stamp 51 is the Lochdorns from its position in F i g. 6 to the left 5 die opening opposite. At the forward delivery and strips off the workpiece from the piercer. movement of the plunger 45, the male part 51 hits the The workpiece is thereby removed from the die and presses it according to FIG. 4 in the measure, that the scraper 87 according to FIG. 9 from its trizen opening 15 into it, the inner end of the position in the workpiece slightly on the front end of the hole die indicated in dash-dotted lines position shown with volume swiveled io mandrel 67 is pushed on and the is forward, where the workpiece in the usual way bouncing off the end of the workpiece at 53 c with a can be performed. conical head is provided. Here the The wire or rod material is forced through the die in its front position Machine supplied via a pipe 110, which is held by the organs 27 and 32, during the according to FIG. 2 up to the rear face of the piercer in its position according to FIG. 4 thereby Die block extends, where the material is held in place, that the nose 73 of the lever 70 at position can come to a stop 111, which rests in the stop screw 74, the usual way is adjusted to the length Now the plunger 45 moves backwards, and of the workpiece. The blank is then the punch carrier 50 is opposite the ram cut off with the help of the separating member 112 and shifted 20 so that the other patrix 52 of the matrix faces through the separating member in front of the opening 15 of the measuring opening. At this point it will trize 14 brought. the control member 27 in the in F i g. 3 position shown The control element 27 is adjusted with the aid of a device in which the extensions 33 are respectively opposite to the recesses bar 113 (FIG. 1), one end of which is opposite at 114 31 of the control element 27 so that it is hinged to the control element from a 25 a backward movement of the die in the die position according to FIG. 2 in its position according to FIG. 3 block against the force of the springs 39 allow. Which moves or in the opposite direction. The other displacement of the stamp carrier and also the ver-end of the rod 113 is set on an angle lever 115 of the control member 27 are articulated by the movement, which causes the lever 57 at 116 on a substructure of the lever 57, which is mounted in the bracket 117 connected to the description ; with the other 30 nen way is operated by the cam 62.
The end of the angle lever 115 is one end of a rod. During the second forward stroke of the plunger 45, 118 engages in an articulated manner, the other end of which at 119 engages the patrix 52 on the workpiece and moves the die 14, which is mounted on the lever 57 already described, from its position to F. i g. 4 in its which by the cam disk 62 and the rear position according to FIG. 5, namely against the wegungsabnahmerollen 61 pivoted back and forth 35 force of the springs 39. Here, the metal of the is. Thus, the control member 27, the die workpiece in the space at the periphery of the end of the in its front position according to FIG. 4 holds or piercer pressed to form a hollow section at the retraction of the die in its rear position workpiece, and the die comes development according to FIG. 5 allows, with every second outward and according to F i g. 5 to rest against the flange 18. Since the action of the ram 45 in the latter position does not cause the die to move any further backwards. The movement of the control member 27 in its can, the punch 52 now sets the head 53 a of the position according to FIG. 2, in which it completes the die in its workpiece according to FIG. While this forward position is held, after the pressing-back process, the piercing mandrel 67 is secured against pulling the plunger 45 after the end of the two-a backward movement that the printed operation on the workpiece according to FIG. 5. 45 rod 69 rests against the nose 72 of the lever 72. According to FIG. 9, the substructure 10 is preferably. When the plunger 45 is withdrawn again, provided with a bracket 120 which, for. B. the rod 82 is moved to the left according to FIG. 2, is fastened by means of screws 121. The bracket 120 around the plug part 69 and the pressure bolt 68 according to has an opening 122, which moves a pipe 123 forward so that the piercing mandrel receives in its position, which is arranged so that a nozzle 50 development according to FIG. 6 is brought to eject the workpiece 124 at the end of the pipeline in alignment with the one from the die, whereupon the work workpiece stands when the stripper 87 is in its piece in the manner described by the stripper F i g. 9 position reproduced with VoUinien is recorded and removed from the die, is pivoted. From a suitable source, not shown here, the die is moved from its position by the springs 39 to the pipeline 123 according to FIG. 5 in the position according to FIG. 6 back-compressed air is supplied, which exits via the nozzle 124, and at the right time the control is so that the workpiece is brought out of the recess 93 into the position according to FIG. 2 brought to be blown out, and approximately at the time to hold the die in its front position, point at which the gripping finger 90 hits an adjustable stop 125, through which the gripping finger 60 and the stripper finger 90 has been detected, is pivoted clockwise. The workpiece of the piercer 67 within the die according to FIG. 1 is preferably blown into a delivery chute, withdrawn by lever 105, the actuation of which leads to a transport box or the like; this supply by the latter pressurized devices under spring tension are shown in FIG. 9 is not done 108,
posed. 65 The following is a brief description of the claims: of the operation. A workpiece 1. Double pressure press for producing or blank 53 is made of a material rod with partially tubular rivets and similar perforated parts, starting from blanks of a predetermined length, with one attached to the slide so that it can move transversely Patrix carrier for a first patrix and a finished immersion patrix, with one opposite arranged, longitudinally movable die and one protruding into the die space Piercing mandrel, with support means for the die opposite the die carrier part of the double pressure press, which hold the die in its front position during the insertion stroke of the blank and bring it back after the finish upsetting, and means for limiting the die stroke in both directions, with a piercer drive for the ejection and return stroke movement and a fixed piercing mandrel position during the insertion stroke, furthermore with a Conveying device and a stripping device, whereby all movements synchronously to the double pressure cycle, derived from a main drive, are matched, characterized that the die (14) can be pivoted in and out by engaging the support means (20, 22) Blocking means (30, 32) can be fixed in their positions so that the male insert, as known per se, designed as a head pre-upsetting male (51) and the piercing mandrel (67), as well known per se, is held stationary via its ejector drive (70,74). 2. Double printing press according to claim 1, characterized in that the recess of the Head compression male (51), as known per se, is conical. Considered publications:
Austrian Patent No. 154 095;
U.S. Patents Nos. 2,338,330, 2114420,
566. 1 sheet of drawings 609 730/145 11.66 © Bundesdruckerei Berlin