[0001] The subject of the present invention is a press with a box frame having hydraulic-,
mechanical-or other drive, which can be applied for various technological purposes,
especially for plastic working.
[0002] Those skilled in the art know presses with a frame supporting structure, being a
further progress in the design of previously applied C-frame presses. As compared
with the letter, presses with a frame supporting structure enable a considerable increase
of rigidity of the frame and'rigid guidance of the press slide, which in C-frame presses
was supported from two sides, whereas in presses with a frame supporting structure
-from four sides. A substantial disadvantage of the known frame structures, however,
was the necessity of applying correspondingly big assembling windows enabling introduction
of the slide and the driving mechanism to the inside of the press frame, as well as
difficulties associated with the treatment of surfaces for guides of the inner part
of the press frame. For this reason presses with a frame design are most often equipped
with guides of the press slide situated in its corners due to which the contact surface
of slide guides is considerably limited.. In order to eliminate partially these inconveniences,
in presses having a frame design roll - lateral guides have been applied, which, however,
for the reason of the quantity of transferred pressures, have not given positive results
because of a too small contact surface of guiding elements. A particular inconvenience
has been shown by presses with a frame supporting structure at the application of
hydraulic drives. Namely, for the reason of assembling difficulties the hydraulic
drive is mounted outside the press frame, most often. on its top, and is attached
to the said frame by means of screws, the said screws transferring forces coming from
the main pressure of the press.
[0003] In order to eliminate partially these disadvantages presses of a box - column design
have been. introduced, known, for example, from the Polish patent no. 70013. The frame
of such a frame consists of a box open at one side and a flat closing plate connected
thereto, whereby the driving mechanism can. be situated both in the box and in the
closing plate. Presses of this type are characterized by increased rigidity and an
easy access to the working space of the press, however, in result. of the fact that
the parting planes of elements of the supporting unit of the press are perpendicular
to the working direction of the press slide the connecting elements, usually screws,
transfer forces resulting from the working pressure of the press. Transfer of pressure
forces occurs in all parting planes of both the frame and the drive of the frame.
[0004] The task of the present. invention is to eliminate the mentioned disadvantages of
hitherto known presses of the frame- or box-column design of the supporting unit and
to create such a design of the press, which on one hand will enable high rigidity
of the supporting unit, and on the other hand will enable an improvement of conditions
of guiding the slide inside the frame by increasing the contact surface of guides.
This task has been realised according to the invention by an application of a frame
consisting of two preferably symmetrical parts which after assembling form a closed
box provided with windows enabling an acces to the working space of the press, the
parting plane of the said box being parallel to the direction of movement of the press
slide. Due to this elements connecting both parts of the frame do not transfer forces
originating from the main pressure of the press. Besides, the design of this type
enables an. access to the interior of the fra- main a dismounted state in order to
perform a treatment of surfaces and to fix guides of the press slide. Due to the division
of the frame in the plane parallel to the direction of the working motion of the slide
there is a possibility of mounting the slide and possibly the driving mechanism on
the side before connecting both parts of the press which after connection form a closed
box. In result of this the length of the slide is not like in the hitherto known designs
of presses restricted by assembly reasons or the size of assembling windows. Thus,
in the press according to the invention the necessity has been avoided of increasing
the height and the transverse dimensions of the press frame for the reasons of assembling
the slide, due to which it has been possible to attain not only a reduction of dimensions
end weights of the press frame but also a considerable increase of its rigidity in
comparison with the hitherto known designs.
[0005] The invention is explained by way of example in the attached drawing in which fig.1
presents the press with a split frame in a perspective projection, fig.2 presents
the same press in a schematic vertical section. with a plane CC, fig.3 - one of the
two parts of these frames of the presses in the view from the centre, fig.4 - the
same part of the press frame in a section along the line DD (fig.3), and fig.5 - the
press in a schematic cross-section along the line AA (fig.2), and fig.6 - the press
in a schematic cross-section BB (fig.2).
[0006] The frame of the press according to the invention consists of two parts 1 and 2 preferably
symmetrical and forming after connection a closed box (fig.1) provided with holes
4, 2 enabling an access to the working space of the press, the parting plahe 3 of
both parts 1 and 2 being parallel to the direction 6 of the working motion of the
press slide 7. In the parting plane 3 both parts 1 and 2 are provided with grooves
8 in which slats 9 protecting against mutual displacement of both parts 1 and 2 in
the parting plane 3 are situated. Inside both parts 1 and 2 of the frame flat guides
10 are fixed which serve for guiding the slide 7 of the press, whereby as opposed
to the hitherto known designs the slide is guided along side surfaces and not on corners.
At the top the slide 7 is connected with a plate 11 serving for fixing tools and provided
with a discharging hole 12 serving for discharge of ready details and wastes from
the inside of the press. At the opposite side to the plate 11 a plate 13 is fixed
to parts 1 and 2, serving for fixing the upper part of a tool. A guide 10a of the
slide 7 covering the parting plane 3 of both parts 1 and 2 of the frame and the upper
tool plate 13 are at the seme time elements connecting both parts 1 and 2 of the press
frame, whereby the said elements do not transfer forces coming from the main pressure.
The slide 7 is preferably provided in corners with bevels 14 enabling a corresponding
thickening of corners 15 of parts 1 and 2 of the press frame, end due to this, correspondingly,
an increase of rigidity of the said frame and advantageous transfer of loads acting
on the said frame.
[0007] The press according to the invention is mounted so that to part 1 of the frame guides
10 end 10a of the slide 7 are fixed, and then the tool plate 13, and in part. 1. the
alide 7 is mounted together with the press drive which is not shown, and then the
frame together with. the mounted slide and the drive is closed by the other part 2
of the frame fixed by means of pins and screws situated in guides 10 and the plate
13.
[0008] The press according to the invention can be applied both as a press with hydraulic
drive, mechanical drive and other.
1. A press with a box frame, characterized in that its frame consists of two similar
parts 1 and 2 preferably symmetrical to a parting plane 3 parallel to a direction
6 of the working motion of a press slide 7, forming after connection a closed box
provided with holes 4 and 5 enabling an access to the working space of the press.
2. A press according to claim 1, characterized in that to inner surfaces of its parts
1 and 2 of the frame guides 10, 10a of the slide 7 and a tool plate 13 are fixed,
guides 10 and the plate 13 being at the same time elements connecting both parts 1
and 2 of the frame.
3. A press according to claims 1 and 2, characterized in that the slide 7 in a form
of a box open at one side is provided in corners with bevels 14, and corners of parts
1 and 2 of the frame are provided with corresponding thickenings 15.
4. A press according to claim 1, characterized in. that parts 1 and 2 of the frame
are provided in the parting plane 13 with grooves 8 enclosing slats 9.
