Патент USA US2129774код для вставки
Sept. 13, 1938. O. KUHNER 2,129,774 DRAW PRESS Filed May 20, 1936 14 12 11 \6 2 Sheets-Sheet l Sept. 13, 1938. o. KUHNER 2,129,774 DRAW PRESS Filed May 20, 1936 2 Sheets-Sheet 2 3'0313‘5 5:4. BY % HTT'O’QIVEY 2,129,774 Patented Sept. 13, 1938 ' UNITED STATES PATENT OFFICE 2,129,774 DRAW PRESS Otto Kiihner, Goppingen, Germany Application May 20, 1936, Serial No. 80,798 10 Claims. (Cl. 153-48) ner. The bolts are guided in slots in the blocks, This invention relates to improvements in hy draulic draw presses which are used for the pro duction of hollow bodies from sheet metal plates. In such presses the plates or sheets are clamped 5 over a table adapted to be moved hydraulically. On the table is secured the pattern, for example a wooden pattern necessary for the production of the hollow body. By movement of the table against the clamped metal sheet the pattern 10 is forced into it. With patterns which do not have a simple form but show, for example, a plurality of which themselves lie on the base plate either ad justable in plane surfaces or swingable in' cylin drical surfaces. The adjustability of the table is attained in a simple way‘by supporting it at at least three points and connecting the table by ball and socket joint with a hydraulically operated ram. The table can, however, also be moved by carrying it on two or more independently'operating hydrau During the process the portions at which greater lic pistons. Thus, if the centres of the pistons lie in one plane, a swinging movement about paral lel axes is possible. With other arrangements of the piston centres, the table can ‘be adjusted still further. The table can be adjusted in any desired direction, if it is adjustably supported at at least three points, and a ram carried by two stretching occurs conform to the pattern more or more pistons serves as the supporting device. curves or any other unusual form, it is not pos sible to clamp the sheet so that‘ it bears through 15 out on the pattern. The drawing process does not then begin uniformly over the whole pattern. strongly and sharply than the portions subjected to lesser stretching. Moreover, these differences have to be equalized and it is necessary ?rst to work the portions of lesser stretching, for ex This arrangement offers a‘ possibility f double adjustment for firstly the ram can be adjusted as desired and on the other hand the table, which - ample the ?at portions, and then, by adjustment is supported against the ram, is adjustable in any direction relatively to the latter. of the form, the portions subjected to greater clamping. Formerly this was e?ected by the trated in the accompanying drawings by way f interposing of liners between the table and the pattern, this necessitating a very correct work ing of the liners. ' The invention consists essentially in that the 30 table is arranged movable in space and ?xable 10 Some embodiments of the invention are ' lus example, in which: ' Fig. 1.is an elevation of a draw press. Fig. 2 is a plan view thereof. Fig. 3 is a side elevation of Fig. 1. Fig.4 is a part sectional elevation of a modi?ed 30 a and that the clamping device consists of blocks form of table. mutually adjustable individually or in groups, ' Figs. 5 and 6 are an elevation and plan view which blockscare arranged either on opposite respectively of a clamping device in accordance with the invention, and _ sides onlyv or on all sides of the table. With such Fig. '7 is an elevation of a modi?ed form of 35 a construction of press the pattern can be ‘ ' brought to any desired position by adjustment of ' clamping device. In the draw press according to Figs. 1.—3, two the table without special liners being necessary. In this way the use of such presses is simpli?ed base plates 2 and 3 rest on three supports I. The base plates 2 and 3 are relatively adjustable and and the possibility of their use extended. in the direction of the transverse axis of '40 Moreover, the construction of the clamping ?xable a plate 4 and carry along their sides the clamp device according to the invention serves to over come the difficulties which arise during drawing ing blocks 5 and 6, which, shown diagrammati with complicated patterns. For example, the cally only in Fig. 2. are adjustable on the base new construction of clamping device enables plates 2 and 3 in' grooves ‘I and B respectively; 45 clamping of the sheet to be obtained along any . The plate 4 is carried by a piston 9 which recip desired form of curve. Re-clamping, that is to rocates in a cylinder l0 under the action of say a second working process, or patterns with water pressure in known manner. The plate 4 is, moreover, formed with a ball seat in which a ball exchangeable parts are no longer, necessary. I I rests. ‘The latter is secured to the actual press .The constructional form of the clamping de vice and the table according to the invention table [2 on which the pattern l3 rests. The table l2, moreover, is supported against the plate 4 by may be as desired, but the following more fully described forms are particularly advantageous. ‘three adjustable bolts I 4. In Fig. 1 the press is _ Each section or block of the clamping device is illustrated, with the vtable [2 not adjusted, at secured by one or more bolts to the base plate, the end of a working stroke, the stretched work piece l5 being omitted. The latter is shown in 55 which is likewise adjustable in a known man 2 2,129,774 Fig. 3 from which, for the sake of clearness, » the clamping blocks 6 have been omitted. At the commencement of the working operation the metal sheet is clamped in the bloclns 5, whereupon the piston 9, plate 4, table 12 and pattern l3 are forced upwardly against the workpiece I5, which takes the form of the pattern I3. In Fig. 2 the blocks 5 are relatively displaced and likewise the blocks 6 can take a di?erent relative position. The arrangement of these blocks 6 enables the workpiece to be clamped not only at opposite ‘sides but on all sides, or to be held only by means of the blocks 6 without, as was formerly necessary, the table l2 having to be turned through 90° and 15 the base plates 2 and 3 separated from one an other. ' The draw press according to Fig. 4 employs the same clamping devices as‘that according to Figs. 1 to 3, but the table I6 is adjustable in a different face; and means for holding said upper part in engagement with said under part. 2. In a hydraulic drawpress of the type re ferred to, the sub-combination of: a base; a press table movable relatively to said base; means for tilting said press table, said means comprising means for adjustably supporting saidtable at at least three points; and clamping devices for a sheet to be treated, disposed around said table on said base. 10 3. In a‘ hydraulic draw press of the type re ferred to, the sub-combination of : a base; clamp ing devices on said base; a press table; means for tilting said press table, said means comprising ad justable supports for said table; a ball carried by 15 said table; a second table supporting said press table by means of said supports and said ball; and means for operating said second table. ‘ 4‘. In a hydraulic draw press of the type re ferred to, the sub-combination of : a base; a press 20 three bearings l1, l8 and IS, the bearing l8 be table; means for tilting said press table, said ing connected to a slide block 20, which is guided . means comprising a cylinder carried by said base in the straight guide 2| carried by supports 22. adjacent each end of said table and a piston mov On the latter and also on supports 23 rest cylin able in each of said cylinders for moving said 25 ders 24 in which pistons 25 slide under the action table. 25 of water pressure, the said pistons carrying dove 5. In a hydraulic draw press of the type re tail-like bearings 26 in which slide members 21 ferred to, the combination of: a- base; a press carrying the bearings l1 and IS. The piston 25 table; means for tilting said table, said means is or both pistons are lifted for adjusting the table comprising adjustable supports for said table, a I6. During the actual drawing operation the ball carried by said table, a cylinder; and a piston table is pressed against the clamped sheet blank in said cylinder, said piston having a bearing sur 30 by further raising of one or both pistons. Also in face adapted to support said ball; hydraulic means this case a pattern, not shown in Fig. 4, is secured for actuating said piston to move said table; a to the table IS. clamping devices for a sheet to be treated, said 35 The two embodiments of the clamping device devices comprising a plurality of blocks secured to shown in Figs. 5-7 can be used in the presses said base, said blocks each comprising an under 35 manner. The said table is pivotally mounted on according to Figs. 1-3 and 4. The clamping de vice according to Figs. 5 and 6 rests on the base plate and is moved thereon for the purposes of 40 adjustment, whilst the clamping device accord ing to Fig. 7 is guided, that is to say is swingable in a cylindrical surface. ' The arrangements according to Figs. 5 and 6 consist of a block 28 on which are arranged two eyes 29 having slots 30 therein in which are guided the bolts 3| for securing the block 28. The edge of the sheet to be treated is clamped between a swingable plate 32 and a projection 33 of the block 28. The pivot pins 34 of the plate 32 rest in plates 35. The plate 32 is adjustable by means of a lever 36 ?xed to the plate 32 and movable in a slot 31 of the block 28. Raising the lever opens the clamping device and depressing closes it. This arrangement can also be secured in a simpli?ed construction with only one bolt 3|. The clamping device shown in Fig. ‘7 besides be ing adjustable on the base plate 38 is swingable in the cylindrical surface 39. The under part 40 is held against the base plate 38 by a bolt 4|, 60 whilst the upper part 42 is held by a bolt 45 swingable at 43 in the under part 40 and carried in the upper part 42 by a ball joint 44. The actual clamping device, viz. projection 46 and plate 41 are formed the same as in the arrangement ac 65 cording to Figs. 5 and 6. part having an upper concave surface, and an upper part having a convex surface movable over said concave surface; and means for holding said upper part in engagement with said under part. 40 6. In a hydraulic draw press of the type re ferred to, the combination ‘of: a base; a press table; means for tilting said table, said means comprising adjustable supports for said table: a ball carried by said table, a cylinder, a piston in said cylinder, said piston having a bearing sur face adapted to support said ball; and hydraulic means for actuating said piston to tiltsaid table; and clamping devices for a sheet to be treated disposed around said table. 7. In a hydraulic draw press of the type re ferred to, the sub-combination of: a base; a press table movable relatively to said base; means for tilting said press table; and a plurality of clamp ing devices for a sheet to be treated upon said base, disposed on each side of said table, each of said clamp devices being adjustable and secur able independently of each other of said devices, whereby said sheet may be clamped on opposite sides or on all sides of said table. 60 8. In a hydraulic draw press of the type re— ferred to, the sub-combination of :' a base; a press table; a centrally disposed pivot bearing for said table; means for tilting said press table, said 1. In a hydraulic draw press of thetype re ferred to, the sub-combination of t a base; a press table movable relatively to said base; means for means comprising a cylinder carried by said base adjacent each end of said table and a piston mov able in each of said cylinders to?tilt said table. 9. In a hydraulic press of the type referred to, tilting said press table and clamping devices for the sub-combination of a base; a press table; a I claim: ’ . a sheet to be treated, said devices comprising a plurality of blocks secured to said base, said blocks each comprising an under part having an upper concave surface, and an upper part having 75 a convex surface movable over said concave sur centrally disposed pivot bearing for said table; 70 and means for tilting said press table, said means comprising a cylinder carried by said base ad jacent each end of'said table, a’piston‘movable in each of said cylinders and means for moving‘ 9,129,774 said pistons independently of one another to tilt the said tableas required. I 10. In a hydraulic press for the production of hollow bodies from sheet metal plates, the sub combination of: a base; a press table disposed above said base; and said table being movable rel atively to said base; a pattern necessary for the \ , 3 production 0!.’ the hoilombody carried on the up per face of said table remote from said base and over which a sheet to be treated is stretched; clamping devices for said sheet disposed around said table on said base; and means for tilting said 5 _ press table and pattern. A , _ ‘ o'rro KtiHNER.