JPH02274497A - Work table for automatic cutting device with metal underlay for material to be cut - Google Patents

Abstract

PURPOSE: To securely and effectively prevent a bounding effect from occurring by forming a pad for cutting material of metallic bars arranged in parallel with each other so as to increase the stability of the pad for cutting material. CONSTITUTION: In a working table for an automatic cutting device which is provided with a metallic pad for cutting material having a surface drilled upward, the pad for cutting material 3 is formed of metallic bars 3a and 3b arranged in parallel with each other. In this case, the corrugated metal bars 3a and non-corrugated metal bars 3b are brought in contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a workbench for an automatic cutting device with a metal cutting material underlay for cutting materials with non-mechanical cutting tools.

[Conventional technology]

DE 2813498 A1 discloses a device for cutting flat material stacks by means of a liquid jet. The cutting material base of this cutting device consists of thin holding plates that are perpendicular and parallel to each other, and these holding plates have blade-like surfaces. Such a honeycomb configuration of the holding plate structure is known, for example, under the name "honeycomb", which honeycomb can be easily manufactured from aluminium.

The wall thickness of these holding plates must be as thin as possible in order to avoid splashing effects by the resulting water jet and thus wetting of the cutting material.

Due to the high energy inherent in the propellant, the aluminum cutting material underlay is subject to very high wear.
This cutting material base is not used for economic reasons in the textile or leather processing industry, where the same cutting pieces are often produced one after the other and numerically controlled cutting jets are repeatedly guided through the same points.

It is not technically possible to produce such a honeycomb structure from copper sheets. During punching or drilling, the wall thickness obtained is not thin enough to avoid rebound effects.

[Problem to be solved by the invention]

The problem on which the invention is based is to improve a working table according to the general concept, so that the cutting material underlay has a high stability, reliably and effectively prevents splashing effects, and which can be easily and cost-effectively The goal is to make it easy to manufacture.

[Means to solve the problem]

This object is achieved in that the cutting material base consists of individual metal strips arranged side by side, with corrugated metal strips and non-corrugated metal strips adjoining alternately.

With this configuration, any desired size of the passage opening, which is absolutely necessary to be able to introduce the injection liquid into the collection tank of the workbench, can be realized in a simple manner. This is because this size only depends on the corrugation of the metal strip.

The workbench according to claim 2 has the advantage that only one type of metal strip can be used and that the contact surface between the individual strips is enlarged.

The design according to claim 3 increases the stability of the cutting material underlay due to the features of claim 4, which are characterized by easy replacement of damaged metal strips.

The structure of the workbench according to claims 5 to 7 is as follows:
``Scuffing'' occurs on the surface of the cutting material underlay when the connections between individual strips break after prolonged use.
prevent.

Other effective configurations of the present invention are defined in claim 8.
This can be seen from Sections 1 to 10.

The design according to claim 11 increases the dead life of the cutting material underlay. This is because, due to the digital control of the cutting tool, only cut pieces extending at right angles to each other can be produced. Even if the cut pieces are made very small, they deviate from the main direction of the cut material underlay and the cutting jet hits the abutting points of the two metal strips less frequently.

〔Example〕

The present invention will be explained in detail with reference to the drawings.

1 and 1+1 show in partially simplified form a numerically controlled am high-pressure jet liquid cutting device, which essentially consists of a workbench 8 and a It consists of an arranged cutting material underlay 3, a cutting gate-shaped structure 9 which is vertically movably supported on a workbench 8 and supports a high-pressure nozzle 11, and a control device 110. Identical components are given the same reference numerals for simplicity.

On the cutting material base 3 the material 12 to be cut is cut, and the individual patterns M are cut by a jet flowing through a high-pressure nozzle 11.

2 and 2a reveal the structure of the workbench 8. The workbench 8 has a rectangular annular frame 13 closed at the sides. Supports 17 are attached to the inside of this frame 13, and these supports are connected to a collection tank 4 that partitions the workbench 8 downward and collects cutting liquid after cutting.

Above the collection tank 4 rests a commercially available grid 15 consisting of longitudinal and transverse columns welded together on inwardly projecting flanges 14 arranged on the frame 13 . These grids 1
5 are used as carrier material for the cutting material underlay 3 and are provided inside the frame 13, between these grids and the bottom of the collecting tank 4, sufficient to effectively channel out the spent cutting liquid. They are placed at such a height that there is still some intermediate space.

On the grids 15 at least one layer of granules l enclosed in baskets 16 are cut and on top of these baskets 16 cutting material bases 3 rest. Other configurations of such a workbench 8 are known and are described, for example, in German Patent No. 38 40 072. Between the cage 16 and the cutting material underlay 3, there is a part 1a (!!
! Further gratings 2 can be arranged as shown in f.

The metal cutting material base 3 consists of a plurality of copper plate strips 3av3b that are glued or brazed together. In this case, the corrugated metal strip 3a is joined to the non-corrugated strip 3b in a lug manner. Instead of a corrugated metal strip, it is of course also possible to use a strip bent with sharp corners (in the form of a triangular or square wave). These strips 3a + 3b each have a length that corresponds to the workbench width B and a width that is finally of arbitrary size. The material thickness of each metal strip 3as3b is less than 1/10 mm, thickness 0.07m
It has been found to be very advantageous to use m stainless steel. In order to increase the stability of the cutting material underlay 3, the metal strips 3a + 3b can be hardened in a known manner. This thickness is related to the cutting material 12 to be placed. In practice, for cutting flexible materials such as textiles or leather, approximately 20
0 workbench where a strip width of nm has proven suitable
As many metal strips 3a13b as the length requires are glued to each other.In order to clarify the arrangement principle, the drawing shows, for example, two strips 3at3b arranged one behind the other.
only is shown. A further increase in stability is achieved if the metal strips 3a+3b are connected to each other by brazing. In another embodiment (FIGS. 1a, 2a), the cutting material underlay 3 is placed on a further grid 2, which rests on a basket 16 filled with granules.

This grid 2 consists of longitudinal struts 6 and transverse struts 7 welded together.
Consists of. On the outer supports 6a + 6b forming the vertical sides,
A pin 5 protruding upward at a right angle is welded from the outside at the intersection of the vertical and horizontal struts 6a+6b, 7, respectively. The upwardly projecting edges 6'+7' of the struts 6.7 are ground to end at an acute angle, and the same applies to the ends of the pins 5. The inner vertical support 6 is the horizontal support 7
Above the grid 2, which is smaller in height (see also No. 9), a cutting material underlay 3 is arranged by means of an alternating assortment of corrugated metal strips 3a and non-corrugated metal strips 3b. The number of metal strips 3a l 3 is enough to completely cover the grid 2
b are fixedly packed together. These metal strips 3a
+ 3b is placed on the horizontal support 7. Wave strip 3a
The filling begins and ends in an advantageous manner, in this case the trough T of the wave being brought into contact with the pin 5. (Metal strip 3a.

3b) laterally acting compressive force or metal strip 3
The shape of the cut material underlay is stable due to the frictional force acting on the longitudinal force quotient between a+3b. Metal strips 3a, 3b+3c
It is possible to magnetize the grating 2 in such a way that it is additionally held by magnetic forces. The length of the pins 5 is chosen such that they do not protrude above the cutting material underlay 3, but are preferably recessed from this cutting material underlay.

Over the length of the workbench 8, the cutting material underlay 3 is divided into a number of individual parts, ie several packed grids 2 are arranged one behind the other, each part containing, for example, 50 metal strips. 3aw3b 7!1) Ra can become. This facilitates manipulation and access into the interior of the workbench 8.

Separate intersection points of the longitudinal and transverse struts 6.7 in the internal area of the grid 2, on the one hand to facilitate the packing of the cut material underlay 3, and on the other hand to increase the stability of the packed new material underlay 3. An additional pin 5 can be attached to (see FIG. 10).

The corrugated strip 3m is produced in a known manner by passing it between two gear wheels.

The pitch or diameter of the gears when passed between the gears is chosen in relation to the desired hole size of the cutting material underlay 3, where a large pitch results in a finely porous surface, and a small pitch results in a large pore size. Produces a porous surface. The size of the holes, on the one hand, has a bearing on what material is to be cut and how quickly the jet liquid is drawn out of the working surface, since on surfaces with large holes the seating area for the cutting material 12 is smaller. It has to do with what must be done.

For better evacuation of the injection liquid 18, a metal strip 3a
l 3b! 3c can be distributed over the longitudinal extent y and perforated so that the liquid can flow not only directly through the incoming wave trough T, but also through the adjacent bran trough. This is particularly suitable if a small diameter hole pitch is desired, where capillary effects naturally limit the rate of liquid outflow. These holes 28 are shown by way of example in FIGS. 7 and 13.

In other cases, the cutting material base 3 at the open longitudinal edges R can be molded with synthetic resin 20, so that some wave troughs T are completely filled with synthetic resin 20.

By molding with this synthetic resin 20, a new high-energy injection liquid 18 is added to this material in case the individual connection points 30 between the metal strips 3a and 3b are broken due to long-term use. It can be ensured that the cutting material underlays 3 are not torn apart from each other in the event of hitting a spot that is no longer connected. This forming is particularly performed on the metal strip 3a
Recommended if +3b were not brazed together. 4 and 6 show the principle of another embodiment of the cutting material underlay 3. FIG. For the sake of identity with the embodiment according to FIG. 3, the same reference numerals are partially used here.

This is because the structure already described is effective for this embodiment as well.

Unlike this, through-holes 21 are provided in the vertical edge R of the cutting material underlay 3 filled with synthetic resin 20, and bolts 22 can be inserted into these through-holes.
By tightening 3, compressive stresses can be generated in the cutting material underlay 3, which increases the safety against tearing of the cutting material underlay 3 or fraying of the surface of this cutting material underlay.

In the embodiment according to FIG. 6, in addition to the compressive stresses in the cutting material underlay 3, additional transverse (y-direction) tensile stresses can be applied to each metal strip 3a + 3b in order to further increase the stability; In this case, buckle bolts 26 (for example wire ropes 25 with rings 24) are fitted on both sides of the bolts 22 on the inside of the longitudinal edge and these buckles 26 are located in the workbench 8, not shown here. Not clamped to the opposing support piece. In FIG. 11, the U-shaped member 19 is connected to the grid 2.
and the cutting material is fitted around the underlayment and the bolt 2
7 shows the possibility of fixing the cutting material underlay 3 at the edge. Figures 4 and 6
It must be taken into account that only two of the metal strips 3a I 3b are shown in the figures, respectively.

In reality, such packing is much tighter and therefore the bolt 22 is also longer.

Another embodiment of the invention is shown in FIGS. 12 and 13. Instead of alternating corrugated and non-corrugated metal strips, metal strips 3c with a "square wave" shape are used. This shape becomes clear from the enlarged partial view according to FIG. In this case, the wave trough TI and the wave crest 11 have different pitch lengths a, b in the 0 drawing,
b=2a applies. These metal strips 3c are brought into contact with each other such that the troughs TI of the waves are supported by the crests Wl of the waves. gluing the bonds between these individual metal strips 3c;
Brazing can also be carried out in other ways of the kind described above. An advantage of this embodiment is that only IN class metal strips are no longer used, which reduces manufacturing costs. As already mentioned, these "square waves J '3c can be brought into contact with the pins above the grid. Similarly in this case, in order to favorably influence the capillary action, the mounting in the longitudinal range y A hole 28 can be provided in the strip at right angles to the position.

Instead of being on top of the basket 16 filled with grain, the cut material underlay 3 can also be planted on a lower trough body consisting of a clamped metal strip, not shown here. can. In this case, the straight metal strips are clamped to the metal frame parallel to each other in the longitudinal direction at intervals. Another metal strip has slits at intervals of the clamped metal strip, so that the former metal strip can be fitted laterally onto the latter metal strip, then cut onto this. A material underlay 3 can be placed on it. If the aforementioned metal strips are chosen to be sufficiently wide, the grid 15 arranged above the collection tank 4 can also be omitted.

If the individual parts are assembled in a '9J@material underlay 3, the cut material underlay 3 can also be replaced as a circulating conveyor belt. In this case, the individual parts are articulated with one another, so that bending and deflection are possible in the deflection rollers, which for this case are to be arranged in front and behind the work platform 8 and can also serve as a drive.

The construction of such "conveyor belts" has been known for a long time and for this reason does not require any special explanation here.

[Brief explanation of drawings]

1 and 1a are perspective views of the automatic jet liquid cutting device, FIG. 2 is a schematic cross-sectional view of the workbench of the jet liquid cutting device according to FIG. 1, and FIG. Schematic sectional view of the table; FIG. 3 is an enlarged partial plane y of the cutting material underlay; FIG. 4 is an enlarged partial plane section of another embodiment of the cutting material underlay; FIG. 5 is an arrow of the cutting material underlay according to FIG. 6 is a view in the direction of arrow A of the cutting material underlay, FIG. 8 is a side view of another embodiment of the cutting material underlay, and FIG. 9 is a side view of another embodiment of the cutting material underlay. FIG. 10 is a partial plan view of the cutting material underlay according to FIG. 8, and FIG. 11 is an alternative view of the cutting material underlay according to the invention according to FIG. 8. A plan view of the embodiment,
Figure 13 is a side view seen in the direction of arrow Z in Figure 12;
FIG. 4 is an enlarged view of the rxJ portion of FIG. 12. 3... Cutting material underlay, 3a... Corrugated metal strip,
3b... To the metal strip that is not corrugated (8 bows hr") to the metal strip (-1-deaf--to)

Claims (1)

Claims: 1. In a workbench for an automatic cutting machine with a metal cutting material underlay with an upwardly perforated surface, the cutting material underlayment (3) comprises individual metal strips (3a, 3a,
3b), characterized in that corrugated metal strips (3a) and non-corrugated metal strips (3b) are alternately abutted. 2. Instead of alternating parallel corrugated and non-corrugated metal strips, only metal strips (3c) bent in the form of square waves are used, the length of the wave crests (W1) being a
2. Workbench according to claim 1, characterized in that the length (b) of the wave trough (T1) differs from the length (b) of the wave trough (T1). 3 Metal strips (3a, 3c) are supported on pins (5), which are connected to the longitudinal and transverse struts (6) of the grid (2).
, 7) forming the vertical sides (6a, 6)
Workbench according to claim 1 or 2, characterized in that it is attached to b) and projects upwardly onto the grate (2). 4 At least one type of metal strip (3a, 3b, 3c)
is characterized in that it has holes (28) in its longitudinal extent,
A workbench according to one of claims 1 to 3. 5 The edge (R) of the cutting material underlay (3) in the direction perpendicular to the longitudinal extent of the metal strips (3a, 3b, 3c) is made of synthetic resin (
5. The workbench according to claim 1, characterized in that the workbench is molded with 20). 6. According to claim 1 or 2, a permanently acting compressive or tensile stress is applied to the cutting material underlay (3) in a direction perpendicular to the longitudinal extent of the metal strip (3a, 3b). The workbench mentioned. 7. The cutting material underlay (3) is perforated and capable of applying compressive stress by means of the threaded portions (22, 23);
Alternatively, the dowel bolts (26) are fitted into the cut material underlay (3), and these dowel bolts are inserted into the cut material underlay (3).
3) projecting in the longitudinal direction (y) above the edges (R) of this cutting material underlayment and through which tensile stresses can be introduced via these stay bolts (26). 6. The workbench described in 6. 8. Workbench according to claim 1 or 3, characterized in that the crests (W) of the waves of two adjacent corrugated strips (3a) are offset from each other. 9. Workbench according to claim 1, characterized in that the corrugated metal strips (3a) are each glued or soldered to a non-corrugated metal strip (3b) at the crests (W) of the waves. 10. Workbench according to claim 3, characterized in that each corrugated metal strip (3a, 3c) contacts the pin (5) in such a way that it is surrounded by a wave trough (T). 11 The cutting material underlay (3) is attached to the metal strips (3a, 3b
) is fitted in such a way that the longitudinal direction (y) of the work surface extends at an angle different from a right angle to the edge of the work surface (8). workbench.