DE3137649C2 - Cutting device for three-dimensional molded parts - Google Patents

Abstract

A device intended for trimming the edges of and for making openings in three-dimensional hollow molded parts is, in accordance with the device according to the main patent. . . (Patent application P 3011244.8), made up of a few individual parts and can be easily converted for all shapes and sizes of molded parts. In a further development of the device of the main patent, the present device is even better suited for the trimming of those molded parts that consist of unstable lobed materials if the support mold (1ΔΔ) is assigned a corresponding hold-down device (45), and if the molded part (32Δ) can be clamped between the support form and the hold-down device in a form-fitting manner. Instead of through slots made in the support mold for the edge section, the support mold (1ΔΔ) and the laser beam head (19) for edge trimming of the molded part (32Δ) can be moved relative to one another along the outer edge (44) of the support mold in a further simplification of the device according to the main patent .

Description

The invention relates to a further embodiment of the device for trimming the edges of and for Attachment of openings in three-dimensional hollow molded parts according to DE-PS 30 Π 244 (main patent).

Such devices are used for making cuts at an angle to one another Levels used, as they typically occur on molded parts made of plastic for motor vehicles, for example on dashboards, headlining parts, floor and trunk carpets, cardan shaft tunnel linings and the like both complicated three-dimensional edge cuts as well as breakthrough cuts in many, in part, irregular ones Make surface areas of the molded parts.

With DE-PS 30 11 244 e ^ ne cutting device proposed of the type indicated, which manages with a few device parts and thus easily convertible for all shapes and sizes of shape miles that occur is that a hollow support shape complementary to the hollow molded part for the positive reception of the Molded part is provided interchangeably at the points of the edges to be trimmed and the openings is provided with continuous slots or corresponding openings, and that a laser cutting device is assigned to the support form, such that the support form and laser beam head along the slots or the opening edges of the support form can be moved relative to one another.

The additional invention is based on the object of developing the device according to the main patent in such a way that it is even better suited for the trimming of moldings made of unstable, non-dimensionally stable materials.
According to the additional invention, this object is achieved in that the support form is assigned a form-fitting hold-down device, and that the molded part can be clamped in a form-locking manner between the support form and the hold-down device. This embodiment is used to advantage wherever molded parts consisting of unstable, non-dimensionally stable materials are to be trimmed. Because this is done by clamping between the support mold and the corresponding hold-down device, such unstable moldings are also given excellent dimensional stability for edge trimming when using cup-shaped open support molds, as will be explained in more detail below.

The molded part to be trimmed and the hold-down device can be held in various ways. The support forms, the molded part and the hold-down device are expediently attached to one another by suction devices fixable. The fixation can also be done by arranging suitable electromagnets or by other means mechanical fastening.

The arrangement can advantageously be chosen so that the hold-down device is through the working end of a handling device can be pressed against the molded part received by the support mold. If here the from the support form, the recorded molded part and the hold-down existing device group relative to the fixed Laser head is moved, complete the handling organs, which are on the one hand on the support form and on the other hand to attack the hold-down, synchronized movements, so that the contact pressure between Maintain the support form and hold-down device over the full cycle of movement with the molded part in between will.

The hollow support form does not necessarily have to be designed as a closed hollow body that passes through the circumferential slot provided for the edge trimming of the molded part from two through internal support interconnected parts consists, but the arrangement can in pursuit of the inventive concept also be made so that the support form and the laser head for trimming the edge of the molded part along the Outer edge of the support form are movable relative to one another. In this embodiment, the support shape has roughly the shape of an open shell, with the outer shell edge roughly following the course of the desired The trimmed edge of the molding follows. The extremely simple device constructed in this way can be used to generate the mentioned relative movement with its support shape at the working end of a freely programmable one Be attached to the handling device, while the laser

jet head is fixed but the reverse arrangement of the elements can also be used get by the laser cutting device to move its laser head in the manner of a free programmable handling device is designed, while the support form is fixed The division of Degrees of freedom of movement between eir.sr Stützformhaiterung and Jer laser cutting device is also possible.

When using a shell-shaped open support form and possibly a correspondingly shaped hold-down device the arrangement is expediently made so that with a stationary laser beam head and a handling device movable support form, opposite the laser head an adjustable suction tube is arranged with the help of the suction tube, which can be made of a laser-resistant material the laser cut fumes are extracted despite the open support shape

Further details of the invention are shown schematically in the following on the basis of the exemplary embodiments Form depicting drawings explained in more detail. In it shows

F i g. 1 is a sectional view through a shell-shaped attached to the working end of a handling device open support form with attached part of the hairdryer,

F i g. 2 one of the F i g. 1 similar sectional view with an additionally arranged hold-down device,

F i g. 3 one of the F i g. 1 of the main patent similar support form in front view with the upturned to be trimmed Molded part and hold-down device attached to it

FIG. 4 is similar to FIG. 8 of the main patent Section with the molded part inserted and a hold-down device inserted into the molded part.

From Fig. 1 shows an embodiment of the device in which a cup-shaped open support shape 1 "at the working end 12 of a broken-off drawn industrial robot 13, which has the in the main patent has five degrees of freedom of movement, is attached. The one inserted into the support form 1 ″ The molded part 32 'is secured by a plurality of fastening elements attached to the circumference of the support mold 1 " 40 held in place. If the molded part 32 'consists of a magnetizable material, the Fastening elements 40 be designed as electromagnets. For molded parts made of non-magnetizable Material are the fastening elements 40 suction devices. But it is also possible from non-magnetizable Material to hold existing moldings 32 'by electromagnets when the electromagnet opposite, with the interposition of the molded part, magnetizable metal elements are inserted into the molded part 32 ' are, for example in the form of a sheet steel ring opposite the fastening elements 40 41, which is shown in FIG. 1 is shown with dash-dotted lines. This sheet metal ring 41 is used as an electromagnet formed fastening elements 40 held in place and thus holds the Formieii 32 'in of the support form 1 ". Opposite the fixedly arranged laser beam head 19 is a adjustable suction tube 42, with the help of which the laser cutting vapors are extracted. At least the wall 43 that the laser beam hits consists of

As illustrated in FIG. 1, the edge trimming of the molded part 32 'takes place along the outer edge 44 of the support mold 1".

The in F i g. The device shown in FIG. 2 essentially has the structure which has been described with reference to FIG. In addition, however, one is the support form 1 "shape-corresponding hold-down device 45 is arranged so that the molded part 32 'is formed between the holding shells Device parts 1 ″ and 45 is clamped. The hold-down device 45, if it consists of a magnetizable Material consists, in turn by fastening elements 40 in the form of electromagnets be held in its position. If it is not made of a magnetizable material, you can attach it to the Fastening elements 40 opposite points plates 46 or the like made of a magnetizable material be incorporated into him. The fastening elements 40 can, however, also be designed as suction devices be like that with reference to FIG. 1 was described. In this case the plates 46 are also corresponding Suction elements.

As an alternative or in addition to the fastening elements 40 and the plates 46, the holding-down device 45 can also be fastened to the working end 47 of a handling device 48 having five degrees of freedom of movement. Dps working end 47 and the industrial robot 48 are shown in FIG. 2 drawn in dash-dotted lines. When the support form 1 "and the hold-down device 45 move, the industrial robots 13 and 48 must be completely synchronized so that the molded part 32 'is fixed between the support form 1" and the hold-down device ^{45 £! Η σ 0Ξ η} 3ηπί in every phase of movement. The industrial robot 48 can be a unit that is separate from the industrial robot 13, but it is also possible to use a second handling arm articulated on the industrial robot 13 instead of the industrial robot 48. In any case, in order to generate an exactly programmed sequence of movements, it is necessary that both the working end 12 and possibly also the working end 47 are fastened in a precisely defined position on the support form 1 ″ or on the hold-down device 45.

In the case of the in FIG. 2, the holding-down device 45 can of course also be the support form, while the support form 1 "acts as a hold-down device.

The convex and curved shown in Fig. 3 A hollow support mold 1 consisting of the upper part 2 and the lower part 3 is a corresponding hold-down device 45 'assigned, so that the molded part 32 "is firmly clamped between the support form 1 and the hold-down 45' is held. Insofar as a fastening of the hold-down device 45 'is necessary, this can be done with reference to on the F i g. 1 and 2 are carried out in the manner described.

The hold-down device 45 'is designed so that its marginal edge 49 in front of the for the edge trimming in the support form 1 provided continuous and circumferential slot 4 ends. At the points aer in the Support form 1 provided openings 6 is the hold-down 45 'with corresponding, but in the dimensions slightly larger openings 50 provided to cut out the corresponding cutouts in the laser To enable molded part 32 ".

A hold-down device 45 ″ can also be used in the support form Γ shown in FIG In this case, the holding-down device 45 ″ has a shape complementary to the support form 1 ′, so that the molded part 32 is fixed is clamped. The outer edge of the hold-down device 45 ″ in turn ends in front of the circumferential slot 4 ′ the breakthrough 6 'in the support form Γ in turn a larger in its dimensions breakthrough 50' in Hold-down 45 "protrudes.

Management example can, if necessary, the hold-down device 45 ″ to that described with reference to FIGS. 1 and 2 Way to be attached or pressed.

The hold-down devices 45, 45 'and 45 "can be formed from the same material as the associated one Support form, for example made of a glass fiber reinforced plastic.

For this purpose 2 sheets of drawings

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Claims (5)

Patent claims: 1. Laser cutting device for trimming the edges of - and for making openings in three-dimensional hollow molded parts, one of which is complementary to the hollow molded part exchangeable support form is provided for the form-fitting reception of the molded part, which at the points the edges to be trimmed and the openings with continuous slots or corresponding Breakthroughs is provided, and wherein the laser cutting device on the remote from the support form Side of the molded part is arranged such that the support mold and laser beam head along the Slots or three-dimensionally movable relative to one another along the breakthroughs of the support form are, the slots and possibly openings in the support form on the laser head remote side are covered by laser-resistant shield elements, which are at a distance from the support mold wall are attached, according to patent 30 11 244, characterized in that the support form (1,1 ', 1 ") a corresponding hold-down device (45', 45", 45) is assigned, and that the molded part (32, 32 ", 32 ') can be clamped between the support form and the hold-down device in a form-fitting manner. 2. Device according to claim 1, characterized in that the support form (1 "), the molded part (32 ') and the hold-down devices (45) can be fixed to one another by suction devices (40, 46). 3. Device according to claim 1, characterized in that that the support mold (1 "), the molded part (32 ') and the hold-down device (45) are operated by electromagnets (40) are fixable to each other. 4. Apparatus according to claim 1, characterized in that the hold-down device (45) through the working end (47) of a handling device (48) to the molded part received by the support mold (1 ") (32 ') can be pressed. 5. Device according to one of claims 1 to 4, characterized in that the support form (1 ") has a Has outer edge (44) which allows an edge trimming of the molded part made along it.