DE2444083A1 - MECHANICAL PRESS, IN PARTICULAR NAPF DRAWING PRESS - Google Patents

Description

DR.-IMG. G. RIEBI.ING 2444 PATENT ADVERTISER * "

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September 11, 1974 ^Subject: The Minster Machine Company, Minster, Ohio / USA

Mechanical press, especially cup press

The present invention relates to mechanical presses, and is particularly concerned with a cup drawing press from unique and relatively simple training.

A cup drawing press is a press in which material, usually strip material, is punched out and the punched workpiece is then shaped, such as by drawing, with both the punching and drawing operations being carried out in a single operation ^ ' ^Λ and the workpiece in the same Position remains.

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Cup presses, due to the fact that the punching process must be carried out before the drawing process, implement devices to cause the punching process, before Drawing process to be carried out. Usually the parts of the bed are controlled in a cup press to cause the punching process to precede the drawing process by means of cams and hinges and the like.

Such mechanisms are not only expensive, they are so Wear and tear and exposed to disorder and are also quite often weak in themselves, which is excessive Distractions under operating loads.

The present invention proposes to provide a mechanical cup drawing press which is simpler in construction is more stable than presses according to the state of the art and in which maintenance problems are reduced are.

In particular, the present invention contemplates the construction where a mechanical cup-drawing press is provided in which cams and hinges and the like, around the cup-drawing operation to cause the punching operation to follow, can be turned off.

The present invention relates to a cup drawing press, in which a frame is provided which has a press table

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and has an upper press table or an upper part,
which is arranged at a distance from the press table,
and stands located between the upper press table and
the press table. Rotatable attached in the
Upper part or upper press table is a crankshaft,
which optionally for rotation in a conventional manner
is driven. On the stands to move back and forth
between the upper part and the press table is an outer one
Carriage slidably guided, which has an opening,
which extends completely through it in the vertical direction. An inner slide is slidably guided in the opening in the outer slide.

Connecting rods are connected to each carriage and extend upward therefrom into the top of the press frame for connection to the crankshaft. The crankshaft has a set of throws thereon leading to the outer slide
include and a second set of crankings on it that too
belong to the inner slide.

According to the present invention, the crankings for the outer slide are relative to the crankings for the inner one
Carriage moved forward at its periphery so that the outer slide precedes the inner slide when the crankshaft rotates. The outer slide is adapted to receive a tool element in order to carry out stamping operations on material which is in

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the press is guided while the inner slide is adapted to receive a tool element in order to carry out a cup drawing or drawing operation on the punched workpiece.
There can also be a blank holder operated by the outer slide. By arranging the crankings for the respective carriages on the crankshaft so that the outer carriage precedes the inner carriage, all other mechanisms which cause the carriages to move in succession are switched off and the press construction is switched off
is therefore relatively simple. but extremely rigid, what
an even material flow of the workpieces during the
Ensures drawing process. An additional advantage of the high structural rigidity is the reduction in operating noise.

The crankshaft is advantageously supported in the upper part of the press by bearings which are close to the various
Throws are arranged on the crankshaft and this provides an extremely firm support for the crankshaft in order to
thus to prevent bending of the press during operation.

Advantageously, all settings for the press
with respect to the carriages are carried out from the outside of the outer carriage. Thus, the bar guide for the inner slide can be accessed from the outside of the outer slide

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can be adjusted, while the adjustment of the daylight opening with respect to each carriage is also from the outside of the outer slide can be performed. The outer slide is as mentioned by an adjustable The slat assembly is slidably guided on the press stands, and the outer slide is considerably longer than conventional ones Press slide because the accuracy of the guidance of the inner slide not only depends on the bar arrangement between the inner slide and the outer slide depends, but on the bar guide between the outer Slide and the press frame.

.Both tenons of the press and the bar assembly and the like in the press are advantageously lubricated by lubricants under pressure, and this reduces the wear and tear minimizes and also increases the rigidity of the support provided by the pivot pins and ledge assemblies.

The precise nature of the present invention and the advantages thereof will be better appreciated with reference to the following detailed Description in conjunction with the accompanying drawings.

It shows:

FIG. 1 shows a somewhat schematic side view of one according to FIG present invention constructed press;

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Figure 2 is a schematic view showing the inner slide of the press in the outer slide and the connecting rods illustrates extending upwardly from the carriages;

Fig. 3 is a perspective view showing a typical crankshaft for a press according to the present invention;

Figure 4 is a schematic sectional view taken along the axis of the crankshaft illustrating the manner in which it is shown in FIG the upper part of the press is supported;

Fig. 5 and 6 incomplete sectional view ^ through the cranks for the inner slide and the outer slide, which represent their relation;

Fig. 7 is a graphical representation of the movements performed by the inner and outer slides * and its consequence represents;

8 is a partially sectioned view, seen on the front of the carriages, showing the relation in greater detail between the inner and outer slides and the connections of the connection s shang en on it;

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Figure 9 is a partially sectioned view from the top of the carriage showing in greater detail the slat assembly with respect to the carriage;

Fig. Io is a somewhat schematic perspective view showing the Figure 3 illustrates adjustable ledge assembly with respect to the inner slide;

11 is a fragmentary view showing the provision of a lubricating fluid catchment container, the is arranged under a bar for the outer slide.

Referring to the drawings in somewhat greater detail, the press shown in FIG. 1 includes an upper part or upper press table Part Io which is received on uprights 12 which extend downward therefrom to a table member 14 which in turn is received by a base 16, and the base and table member 14 are assembled together.

An outer slide 18 is mounted in the press frame such that it can move back and forth and is guided on the uprights 12. The outer slide is provided with a counterweight arrangement on each side, one of which is indicated by 2o in FIG is designated.

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Fig. 1 shows the press from the side and tape material is suitable, in a front-to-back direction, through a Feed mechanism, indicated generally at 24, driven in synchronism with the press crankshaft which is indicated schematically by 26 in FIG. 2. The crankshaft 26 is adapted to be driven by a gearbox to be, which in turn is suitable to be driven by a jump wheel 28, which in turn is driven by an electric motor 3o.

V-belts or the like drive the motor with the flywheel 28 and that of the flywheel 28 to the crankshaft 26 leading drive embodies a clutch-brake combination, which is operational when the brake is applied to disconnect the drive from the flywheel and to brake the drive connection against the press frame. if the brake is released and the clutch is actuated, the drive connection is released from the press frame and connected to the Flywheel 28 is coupled and causes the crankshaft 26 to rotate. The special drive arrangement that differs from the electric motor 3o through the flywheel 28 and the above-mentioned drive connection to the crankshaft 26 is in essentially conventional and is not described in detail in the present application.

Fig. 2, which is a schematic front view of the press,

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will illustrate that there is an inner slide 32 disposed within the outer slide 18. The outer one Carriage 18 has associated connecting rods 34 which extend upwardly into the top Io of the press while the inner slide 32 has connecting rods 36 connected thereto which extend upward into the top of the press. The connecting rods are suitable to the respective to attack provided on the crankshaft 26 cranks.

As can be seen from Fig. 3, the crankshaft 26 has an outer Pair of crankings 38, which belong to the outer slide 18 and with which the upper ends of the connecting rods 34 are connected in a conventional manner. The crankshaft 26 also includes an inner pair of throws 4o that lead to the inner slides 32 belong and to which the upper ends of the connecting rods 36 are connected.

According to the present invention and, as can be seen from FIG. 3, the cranks 38 are angularly offset from the cranks 4o ^ and especially in the direction of rotation of the crankshaft 26. In the In the particular crankshaft illustrated, the throws 38 advance the throws 4o by one hundred degrees, but the special one The angle between the crankings 38 and the crankings 4o is variable in accordance with the particular tool arrangement, which should be placed in the press. The crankshaft is a simply forged link, with the crankings integral with it and is therefore extremely solid and

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rigid. The press is constructed so that the crankshaft is driven from either one or both ends, but preferably from driven at both ends to minimize twisting. Such twisting of the crankshaft could cause sufficient angular movement relative to the cranks of a respective part thereof to the associated To cause Schüttren to stand at an angle in the press. By driving the crankshaft at each end it will such a twist eliminated. The crankshaft could of course only be driven from one end if they is made sufficiently massive for the operation to be carried out.

Figure 4 schematically illustrates the manner in which the crankshaft 26 is supported in the top Io of the press. In FIG. 4 it can be seen that the crankshaft is provided with shell-like bearing sleeves, which are designated generally by 42 and clamped in place around the crankshaft, for example by bearing caps. The bearing shells ^ or sleeves directly outside the outer crankings 38 are flanged on the cranking side and thus serve as pin bearings for the crankshaft assembly. It will be noted that the bearings are positioned close to the cranks on opposite sides thereof are, and thereby the crankshaft resistant to bending due to the loads imposed by the respective carriages support.

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The bearings are preferably pressure lubricated and this is accomplished by conduit assemblies 46 passing through the bearing caps 44 lead and are connected to a source of lubricants under pressure. The lubricant supply to the individual bearings can be controlled in any suitable manner such as needle valves. The crankings of the crankshaft can also be pressure lubricated by lubricant supplied through passages in the connections 34 and 36 are formed.

FIGS. 5 and 6 illustrates the relative sizes and the angular orientation of Köfcrpfungen 38 and 4o _r Fig. 5 illustrates an offset is 38, and Fig. 6 illustrates an offset represents 4o.

Assuming the direction of rotation of the crankshaft, as shown in Fig. And 6, is counterclockwise, is to see that the offsets 38 lead the offsets 4o by about one hundred degrees. Furthermore, the cranks provide for a much lesser amount of movement for the outer slide than it does for the inner slide the cranks 4o is provided. This is because the outer slide 18 is performing the stan process, which is only requires a relatively small stroke while the inner slide 32 performs the pulling process, which one considerably longer stroke is required.

More specifically, and with reference to FIG. 7, in the specific

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illustrated press the outer slide 18 a total stroke of about 50.8 ram (2 inches), whereas the inner Carriage 32 has a total stroke of about 165.1 mm (6 1/2 inches) having. Fig. 7 also indicates the amount of advance of the outer slide relative to the inner slide. This Leading is represented at ten degrees for the particular press illustrated in this application. As mentioned, however , can have both different lead angles and different slide strokes in accordance with the particular one Operation to be provided that is carried out.

In most cup drawing operations, the punched workpiece is held by a blank holder while the drawing operation is in progress. In Fig. 7, the point labeled A is that point at which the blank holder, which is actuated by the outer slide, releases the blank. Further points indicated in FIG. 7 are the point B _T at which the drawing punch protrudes over the punch by the greatest distance and also the point at which the inner and outer slide surfaces, measured in the vertical direction, are closest together and the point C, at which the punch protrudes by the greatest distance above the drawing punch and also the point at which the slide surfaces, measured in the vertical direction, are furthest apart. The vertices of the two curves represent the upper and lower limits of movement of the respective carriages. The curve belonging to the carriage 18 shows this

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attached reference numerals (18), whereas that to the inner The curve belonging to the slide 32 has the reference symbol (32) attached thereto.

8 is a fairly detailed illustration of the relationship between the carriages and depicts carriages 18 and 32 and the connecting rods 34 and 36 connected thereto. As can be seen from FIG. 8, the lower end of each is the Connecting rods 34 by a bolt 5o with the head of a Connected screw 52 which is screwed into a nut 54,

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which has a worm wheel 56 distributed thereon, on which a rotatable worm 58 engages. Both connecting rods 34 are constructed similarly and the associated screws 58 are geared together to rotate in unison so that the effective length of both connecting rods 34 can be adjusted at the same time by adjusting only one of the screws.

The nut 54 and worm wheel 56 are injdem by a flanged clamping member 6o in a recess Slide "18 held in position.

The same type of arrangement is provided with respect to the nuts that hold the connecting rods 36 for the inner slide associate; the associated screw is designated with 63, the nut with 65, the worm wheel with 67 and the worm with

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69. The worm 69 for the connecting rods 36 s-irrd also provided together with gears so that the adjustment of only one of them is operable for adjusting the effective length of both connecting rods 36 at once.

Fig. 8 also illustrates the provision of a catcher 71 under the ledge assembly for the inner slide Collecting container 71 catches lubricant that flows out between the strips and conveys it to an oil tank 73, from which the lubricating fluid is recovered and again is put into circulation. As will be seen in the following, the strip arrangement for the outer slide is also included Provided catch containers so that lubricant can be taken up and put back into circulation. ■

FIG. 9 details the slat assembly for the outer slide 18 and inner slide 32. Referring first to FIG Referring to ledge assembly for the outer carriage, the uprights 12, one of which is on each side, carry uprights 12. each at the front and rear of the press has a clamping member 6o which is slidingly engaged along the press is adjustable with a strip element 62, which is received by the carriage 18. The carriage 18 carries a another bar 64 which engages the member 6o at right angles to the direction of engagement of the bar 62, and the Bar 64 is supported by a tapered strip 66, which is also along de? Press slide is adjustable, to thereby adjust the bar member 64 in the lateral direction. With a strip arrangement as described thus has

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the outer slide has an eight-point support in each corner and is thus precisely guided on the press stands 12 during the reciprocating movement thereon.

Regarding the strip arrangement between the inner slide 32 and the outer slide 18, there is on the rear side of the inner slide flat bar members 68, on which wear plates 7o attack, which are attached to support members 72 on the inside of the outer slide are included. Support plates 72 and wear plates 7o are attached to the outer slide by head screws 74 in FIG Fixed position.

At each * front corner of the inner slide there is one Slat member 76 is attached thereto which extends at 45 degrees to the centerline of the inner slide so that the members 76 on opposite sides of the inner slide converge toward the front of the press. To each Link 76 engages an adjustable link 78 which has a 45 degree incline on one side that adjoins the respective

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Link 76 engages and a slope / a smaller angle on the opposite side.

A correspondingly engages the inclined surface 8o of the link 78 inclined surface on a wedge member 82. The links 78

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and 82 are received on an angled support plate 84, which is connected to the inside of the outer carriage ^ for example by cap screws 86. Cap screws 88 extend through the front of the outer slide and through link 84 and are bolted to wedge link 82 *, for adjusting the wedge member in the longitudinal direction of the press. Likewise, cap screws 9o extend through the front of the outer slide and through link 84 and are screwed to link 78. The openings in the outer Carriage 18 and the support member 84 for the screws 9o are clearance holes so that the member 78 is set laterally can be to mount the inner slide 32 quite accurately in the outer slide.

The slat assembly for the inner slide 32 shown on the Inside of the outer slide 18 is attached, is of sufficient length that the inner slide is always in the Bar arrangement is included and is therefore always performed very precisely. It can also be seen that all settings of the strip assembly for the inner slide 32 can be carried out from the outside of the outer slide. The various screws and the like are distributed vertically along the outer slide so that the optional Adjustment of different areas of the bar arrangement can be carried out.

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Figure 9 also illustrates a door 92 provided on the outer slide having an opening 94 therein covered, through which access to the adjacent screw 69 can be obtained for the adjustment of the to the inner Sled 32 proper daylight. The carriage 18 also has openings 93 therein (Fig. 2) through which Access to the inner slide for attaching the cutting stamp is achieved.

8 and 9 also illustrate that the inner slide 32 is provided with a single counterbalancing cylinder assembly 96 is which, similar to the counterweight arrangement 2o for the outer slide, is advantageously pneumatically actuated Will.

Fig. Io is a perspective view corresponding to that of the inner Slid 32 belonging and fastened in the outer slide bar assembly illustrated schematically. The different Parts of the strip arrangement of Fig. Io have the same reference numerals as in Figs. 8 and 9, while "the distribution of the Clamping screws etc. is specified over the length of the various links. This view also represents the surface of the Member 78, which engages the bar 76, which is provided with a zigzag groove 98 formed therein ^, and terminating at both ends within the boundaries of the inclined surface which engages the limb. Lubricant under

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Pressure can be supplied to the groove 98 via a passage loo be and the lubricant that is between the opposing Relatively slidable members of the bar arrangement flows out, is down there along and through the collecting container 71 collected. A similar receptacle is for each of the ledges at each corner of the interior Slide provided and all strip surfaces are provided with lubricating fluid under pressure.

The relatively movable strip surfaces belonging to the outer slide are also provided with a collecting container, as illustrated schematically in FIG. In Fig. 11 is the lower end of the strip assembly labeled Io2 schematically illustrated for one of the corners of the lower carriage and underneath there is a collecting container Io4, in which liquid flowing from the groin is collected will. The press is provided with other troughs, collecting containers and the like to collect circulating liquid, so that it can be returned to a storage container and pumped around again through the press construction.

From the above it appears that the press according to the present Invention of relatively simple construction, but for extremely precise and firm guidance of the interior Carriage provides and ensures successive operation of the outer and inner carriages without providing more expensive and humorous cams and hinges and levers and the like.

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Modifications can be made within the scope of the attached Claims are executed.

Patent claims

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Claims (11)

Claims 1. Mechanical press, marked by a press frame (12) which has an upper part (lo) and a Has table (14) and stands (12) extending between the top and the table, an outer slide (18) a first arrangement (34) which guides the outer slide on the stands for movement towards the table and away from it, an inner slide (32), a second assembly (36) that connects the inner slide to the outer slide leads to the movement parallel to the movement of the outer slide, a crankshaft (26) which is rotatable in the upper part respective pair of cranks (38) (4o) on the crankshaft for each slide and a respective pair of connecting rods (34/36) for each slide, each connecting rod having one end pivotally connected to the respective slide and the other end engages an associated offset of the crankshaft, which belong to one of the carriages Offsets from the one belonging to the other is angularly offset, whereby when the crankshaft rotates one of the Slide will lead the other in both directions of movement of the slide. 2. Mechanical press according to claim 1, characterized in that - 21 - 509817/0240 shows that the to the outer slide (18) associated crankings (38) are offset forward from the crankings (4o) belonging to the inner slide C32), as a result of which the outer slide (18) leads the inner slide (32). 3. Mechanical press according to claim 1, characterized by an arrangement (52,63) for adjusting the effective length of the associated with each carriage (18,32) Connecting rods (34,36). 4. Mechanical press according to claim 1, characterized in that the first arrangement cooperates Includes elements of bar assemblies on the stands and corners of the outer slide, which Elements of the slat assembly interlocking angularly related surfaces at each corner of the outer carriage having, and the elements of the strip assembly relatively adjustable are. 5. Mechanical press according to claim 1, since d u r c h characterized in that the second arrangement cooperates Contains elements of the strip assembly on the corners of the inner slide and in the outer slide, the elements of the strip assembly have mutually engaging surfaces, the elements of the strip assembly on one Side of the inner slide their mutually attacking - 22 - 509817/0240 Have surfaces parallel to a first plane and the elements of the strip arrangement on the opposite Side of the inner slide whose mutually engaging Have surfaces in respective second planes which are arranged at an angle to the first plane and to one another are. 6. Mechanical press according to claim 5, characterized characterized in that the second plane makes an angle of about 45 degrees to the first plane, the second Plane is substantially perpendicular to each other and in a direction away from the respective side of the interior Slide converges. 7. Mechanical press according to claim 5, characterized in that characterized in that the elements of the strip arrangement contain elements for the inner slide which are adjustably mounted in the outer slide and ^ a Arrangement the elements adjustably mounted in the outer slide and from the outside of the outer slide are accessible. 8. Mechanical press according to claim 1, characterized in that the outer slide is parallel Has front and rear parts. " and parallel side panels, which are perpendicular to the front and rear parts, - 23 - 509817/0240 the parts define a rectangular opening that extends through extending the outer slide to receive the inner slide, the first array of cooperating elements the first slat arrangement on the uprights and on the corners of the outer slide, the angularly related, has mutually engaging first guide surfaces, the second arrangement cooperating elements of the second Contains strip arrangement in the opening in the outer slide and on the corners of the inner slide of the reciprocally engaging second guide surfaces parallel to the first guide surfaces, the height of the outer slide in one direction of the axis of the opening therein is essential greater fet than the height of the inner slide measured in same direction. 9. Mechanical press according to claim 8, d a d u r ch characterized in that the first guide surface includes a pair of angularly related surfaces at each corner of the outer slide and the first ledge assembly is adjustable for the optional, relative setting of the angularly related surfaces. 10. Mechanical press according to claim. 8, marked through an arrangement for supplying liquid under pressure to the mutually engaging guide surfaces and a collecting container under the strip arrangement - 24 - 509817/0240 for taking up liquid, which from the guide surfaces expires. 11. Mechanical press according to claim la, characterized characterized in that the guide surfaces are vertical and the receptacle has a trough in the outer one Contains sledges under every other slat arrangement and a trough in the frame under every first slat arrangement, the troughs are adapted to drain to a collection area from which the liquid is returned to the guide surfaces can be. 509817/0240