DEVICE FOR MACHINING WINDOW OR DOOR FRAMES WELDED FROM PROFILE PIECES

Description

[0001] The invention relates to a device for machining frames welded from profile pieces, such as window or door frames made of plastic, with at least one machining head and machining tools arranged thereon, which can be moved into the respective machining position on the frame.

[0002] Such a processing device is known, for example, from US 2007 / 0234550 A1. This device has several processing tools mounted on a tool carrier, which in turn can be moved in two mutually perpendicular directions. Additionally, a second movable tool carrier arranged to the side of the tool carrier is provided with a processing tool for processing a profile leg of the window frame. The second tool carrier can be moved in the diagonal direction of the frame corner clamped in the machine, allowing both the processing of the frame corner and the processing of a profile leg with a single machine.

[0003] WO 2015 / 031793 A1 discloses a window processing machine with a drive mounted on a robot arm, which has a holder for tools, such as a saw blade on one side and a milling cutter or drill on the other side, on its oppositely projecting output shafts. By arranging the processing unit on a robot arm, the tools can be moved in three spatial directions and also rotated.

[0004] US 2015 / 063936 A1 discloses a window processing system and method for manufacturing window frames or sashes. The system comprises an articulated arm with a plurality of elements and arms to enable movement around multiple axes defined by the articulated arm. The system further comprises a tool holder coupled to an outermost element of the plurality of elements, the tool holder providing a plurality of tools for performing cleaning operations on a window frame or sash during use.

[0005] DE 102 13 778 A1 discloses a machine tool comprising a machine frame, a work spindle mounted on the machine frame and rotatable about a spindle axis for holding a workpiece, and a first tool carrier with a tool carrier head rotatable about an axis relative to a bearing housing. The work spindle and the tool carrier head are movable relative to each other in a controlled manner by means of a controller at least in the direction of an X-axis and a Z-axis, and the work spindle is rotatably positioned about the spindle axis as a controlled C-axis.

[0006] EP 1 291 101 A2 relates to a machine tool with a tool spindle for holding a workpiece and a multiple tool carrier and a machine control system with which the workpiece spindle and the tool carrier can be moved three-dimensionally relative to one another and with which the workpiece can be rotationally positioned about a workpiece spindle axis as a controlled C-axis.

[0007] DE 10 2016 006791 A1 discloses a machine for machining workpieces, which comprises at least one workpiece spindle, via which a workpiece to be machined can be driven in rotation about a workpiece rotation axis. A swivel head located opposite the workpiece spindle is pivotable about a pivot axis and carries at least two tool spindles, each of which holds at least one machining tool, which can be driven in rotation about a tool rotation axis.

[0008] The disadvantages of the known devices are the design effort for the movable and rotatable tools on a robot arm or the effort due to the arrangement of a second movable tool carrier and the comparatively small number of tools as well as the high programming and software effort for the positioning of the tools.

[0009] Based on this, the invention is based on the object of further developing a device of the type mentioned at the outset in such a way that, with a simple structural design and reliable operation, machining of both the corner joints of the frames and machining of the frame legs, for example for producing profiled openings, bores and the like, is possible.

[0010] This object is achieved by a device having the features of claim 1. Advantageous embodiments are the subject of the subclaims.

[0011] The device according to the invention for machining frames welded from profile pieces, such as window or door frames made of plastic, has at least one machining head with tools arranged thereon, which can be moved into the respective machining position on the frame to be machined.

[0012] The machining head can be pivoted about an axis and has a positioning shaft arranged at an angle to this pivot axis, on which the machining tools are arranged.

[0013] The pivoting ability of the machining head and the rotatability of the positioning shaft carrying the tools makes it possible to machine both the corner of the frame and the profile leg using a single device and in a single clamping position of the frame. For example, the machining head for machining a frame corner is brought into its starting position and, by pivoting the machining head around the pivot axis, its positioning shaft carrying the machining tools is aligned diagonally with the frame corner. By turning the positioning shaft, the desired machining tool is selected and by moving the machining head towards and / or away from the frame corner, the outer and / or inner corners as well as the visible surfaces are machined. Once the frame corner has been machined, for example using additional machining tools, a frame or profile leg can be machined.For this purpose, the machining head can be moved or brought into its starting position, aligned perpendicularly to the profile leg to be machined by pivoting around the pivot axis with the positioning shaft, the desired tool can be selected by turning the positioning shaft and brought into the working position by moving or advancing to the profile leg.

[0014] In the case of water slots or similar openings, for example for drilling holes, the machining head can be moved along the frame leg with the machining tool engaging the respective frame leg. Of course, the reverse procedure is also possible, whereby the frame leg is machined first and then the frame corners, as well as a combination of the machining steps.

[0015] This ensures complete processing of window and door frames.

[0016] The device according to the invention is highly flexible. Machining of the profile bar or frame leg is structurally simple.

[0017] According to a first embodiment, the positioning shaft with the machining tools arranged thereon can be positioned in the direction of rotation by means of an actuator. This enables quick and precise selection of the respective machining tool and exact positioning to the frame corner or to the frame leg to be machined.

[0018] Preferably, the pivot axis and the axis of the positioning shaft are aligned substantially perpendicular to each other, so that all machining positions on the frame and at the frame corner can be reached. Preferably, the pivot axis is perpendicular to the clamping plane of the frame, while the axis of the positioning shaft runs parallel to the frame plane.

[0019] According to a further embodiment of the invention, the machining head is additionally movable in three axes, preferably mounted on a carriage that can be moved in three axes. This allows the carriage with the machining head to be angled relative to the clamping plane of the frame, further increasing the universal applicability of the device. This allows any position on the frame to be approached with a wide variety of tools.

[0020] According to the invention, the positioning shaft extends on both sides of the machining head, with machining tools at both ends of the positioning shaft. This allows a multitude of tools to be arranged at the ends of the positioning shaft in order to machine a wide variety of frame geometries and specifications with regard to openings and bores on the frame legs. The arrangement of various tools at opposite ends of the positioning shaft results in a compact design and allows for a large number of tools to be implemented. This also enables complete machining of a single crossbar of the frame.

[0021] Another concept of the invention provides that the positioning shaft is itself adjustable in one axial direction relative to the machining head. This allows for even more universal positioning of machining tools, even in areas of the frame that would otherwise be difficult to access from the machine side. The tools can be mounted on tool carriers arranged on both ends of the positioning shaft, allowing the device to be adapted to any dimensions of profile pieces and different requirements.

[0022] It is of course also conceivable that fixed and / or motor-driven tools are provided, which also increases the variety of processing options.

[0023] According to the invention, the axes of the machining tools are aligned perpendicular to the axis of the positioning shaft, which reduces the collision of tools that are not currently needed with the frames to be machined.

[0024] The measure according to the invention also aims in the same direction, whereby one of the tools protrudes at least partially from the machining head at least in one direction of rotation of the associated positioning shaft end, so that the respective machining tool can be used freely without a collision occurring between the machining head and the workpiece.

[0025] A particularly advantageous feature of the invention is that at least one motor drive, in particular an electric drive, is provided for the machining tools, with a continuous output shaft and tool holders for rotating machining tools arranged on both shaft ends. This allows tool holders for rotating machining tools to be provided with a common drive on opposite sides of the output shaft, which significantly reduces the technical complexity of driving the machining tools.

[0026] If at least two motor drives for machining tools are provided at the ends of the positioning shaft, these are arranged one behind the other in the axial direction of the positioning shaft, according to the invention, and their tool axes are aligned at an angle, preferably at a right angle, to each other. This achieves a particularly compact design without the tools not currently in use colliding with the workpiece.

[0027] The positioning of the positioning shaft is preferably CNC-controlled, so that the tool position can be carried out without pneumatics using only the CNC program, enabling high precision and reproducibility.

[0028] To achieve a particularly short cycle time when machining frames, at least two machining heads are provided, preferably for simultaneous machining of the corners and / or side profiles of the frame. It is also conceivable, of course, to provide two machining tools on each side of the frame to be machined, thus achieving a further reduction in cycle time for frame machining.

[0029] Further objects, advantages, features and possible applications of the present invention will become apparent from the following description of an embodiment with reference to the drawing.

[0030] They show: Figure 1 shows a possible device for machining frames with two carriages in a starting position, Figure 2 shows an enlarged view of a machining head according to Figure 1 , Figure 3 a partial representation of the device according to Figure 1with machining heads and profile clamping in a starting position, Figure 4 the device according to Figure 3 in working position for internal corner machining, Figure 5 shows a further working position of the device for internal corner milling, Figure 6 shows the device according to the previous figures in a working position for machining a profile leg or a cross bar of the frame and Figure 7 shows the device according to the previous figures in a working position for machining a longitudinal bar of the frame.

[0031] Figure 1 shows in an overall view a device for machining the corner area of window or door frames 5, which enables machining of both the frame corner and the profile legs in the same clamping position of the frame 5.

[0032] Frame 5 consists of plastic profile pieces or frame legs 1, 2, 3, and 4, previously mitered and then welded at the corners, with longitudinal and transverse bars. The weld seam resulting from welding in the area of a corner, which is important for aesthetic reasons alone, runs at a 45° angle to the interconnected frame legs or profile pieces 1 to 4.

[0033] The machining of the corner joint is carried out using milling, parting-off or, for example, drilling tools 6 to 13. In order to bring the machining tools 6 to 13 into working position at the respective corner areas of the frame 5 to be machined, the machining tools 6 to 13 must be movable horizontally or parallel to a clamping plane 27 of the frame 5 in a holder of the machining device both in the XY direction and in the Z direction perpendicular to the clamping plane 27. In the Figure 1 and 2The X, Y and Z directions are shown. In addition, Figure 2 The rotation and swivel directions Q1 and Q2 are indicated. For this purpose, a Figure 1 The machine frame 35 shown is provided with two carriages 36 that can be moved in the X direction, each of which holds a machining head 14, 25 that can be moved in three spatial directions. It is also conceivable for two machining heads 14, 25, used on one side of the frame, to be arranged on the carriage 36. The movement of the carriage 36 can be achieved by means of linear drives, such as stepper or spindle motors or, for example, pressure-operated piston-cylinder units. The movement of the machining head 14, 25 allows machining of both the top and bottom sides of the clamped frame 5.

[0034] In the embodiment chosen here, both fixed tools 10 to 13, such as parting knives for removing the weld bead created in the corner area of the frame 5 during welding, as well as rotating tools 6 to 9, such as drills for creating a sealing groove, disc milling cutters for removing the weld bead on the outer corner of the frame 5 and the like, are provided as processing tools.

[0035] Machining tools 6 to 9 are used to machine the profile legs or profile pieces 1 to 4, for example to drill holes in the outside of the profile legs or to create elongated holes.

[0036] The machining head 14, for example, mounted on a movable carriage 36, as shown enlarged in Figure 2 is pivotable about a vertical axis 15 in the embodiment chosen here, as shown by the double arrow labelled Q1 in Figure 2 For this purpose, an actuator 28 is arranged on the carriage 36 or support, which, in the embodiment chosen here, causes the pivoting of the machining head 14 relative to the carriage 36 via a toothed belt 30.

[0037] The actuator 28 can, for example, have an electric motor which drives the toothed belt 30 via a pinion 29 arranged on its output shaft, which pivots the machining head 14 about the pivot axis 15 via a gear 31.

[0038] Furthermore, a positioning shaft 16 is mounted in the machining head 14, on which the machining tools 6 to 13 are arranged. The positioning shaft 16 is adjustable in the direction of rotation by means of an actuator 26. In the embodiment chosen here, the pivot axis 38 of the positioning shaft 16 is perpendicular to the pivot axis 15 of the machining head 14, with the pivot axis 15 itself being oriented perpendicular to the clamping plane 27.

[0039] As is particularly evident from Figure 2 As can be seen, the positioning shaft 16 extends to both sides of the housing 37 of the machining head 14 and carries the machining tools 6 to 13 at its ends 16a, 16b. Tool carriers 17, 18 are arranged at both ends 16a, 16b of the positioning shaft 16, on which the tools 6 to 13 are held, preferably in an interchangeable manner.

[0040] As from Figure 2As can be seen, the positioning shaft 16 has a pivot axis 38 about which the positioning shaft 16 is pivotally arranged, as symbolized by the double arrow designated Q2.

[0041] As can be seen from the figures, both fixed tools 10 to 13, such as stripping knives, are provided on the tool carrier 18, and motor-driven machining tools 6 to 9 are arranged at the other end 16b of the positioning shaft 16 on the tool carrier 17.

[0042] In the case of the motor-driven machining tools 6 to 9, their axes 21, 22 can be aligned parallel or perpendicular to the positioning shaft 16.

[0043] As in particular Figure 2As can be seen, in the embodiment selected here, two motor drives 19, 20 for machining tools 6 to 9 are provided at one end 16b. These motor drives are arranged one behind the other in the axial direction of the positioning shaft 16 and are aligned with their tool axes at right angles to one another. The motor drives 19, 20 have a continuous output shaft with tool holders for the rotating machining tools 6 to 9 arranged at both shaft ends 23, 24. This allows two machining tools 6, 7 or 8, 9 to be driven with one drive.

[0044] A CNC control is provided for positioning the positioning shaft 16, which enables precise positioning of the tools 6 to 13.

[0045] For machining, the frame 1 is placed in a frame support 32 and fixed by means of clamping and centering means 33, 34.

[0046] The clamping means 33 can, for example, be hold-down devices that clamp the frame 5 onto the support 32 of the machine frame 35. Additionally, centering means 34 are provided, which engage the inside of the frame 5 or the profile legs 1 to 4 and center the frame 5 and secure it against displacement in the clamping plane 27.

[0047] For the machining itself, the machining heads 14 are first positioned. For this purpose, for example, the carriages 36 carrying the respective machining head 14 are advanced to the frame 5 to be machined. Then, for example, for corner machining, the respective machining head 14 is pivoted diagonally to the frame, for example, by 45°, about the pivot axis 15 by means of the actuator 28. Then, preferably simultaneously, the desired tool 6 to 13 for corner machining is selected by rotating the positioning shaft 16. Figure 3the position of the machining heads 14 for internal corner machining with a side milling cutter is shown.

[0048] Then the corresponding machining head 14 with tools 6 to 13 is brought back into its initial position and by turning the positioning shaft 16 and / or turning the machining head 14, 25 the next machining tool 6 to 13 is selected. Figure 4 the processing of the frame corner with a processing tool 12 designed as a draw knife can be seen.

[0049] In Figure 5 the machining heads 14, 25 are opposite to the position in Figure 3 , 4 rotated by 180° around the swivel axis 15, so that a side milling cutter 8 is now used for internal corner milling.

[0050] In the processing situation according to Figure 6 the machining head 14, 25 with its positioning shaft 16 is aligned parallel to the profile piece 2, i.e. opposite to the position according to Figure 5pivoted again by 45°, so that the outer contour of the frame 5 can now be machined by means of a contour milling disc or, for example, by means of a form milling cutter 6, 7.

[0051] In Figure 7 the work steps with other tools are shown, such as machining of the profile piece 1 to 4 to create water slots using a milling cutter 6 along the profile piece 4.

[0052] The device according to the invention enables a maximum degree of flexibility and also allows rapid adaptation of the device to a wide variety of dimensions of the frame 5 to be processed.

[0053] The invention is not only limited to two-head machining, but a four-head machining device can also be provided, with several, in particular two, machining heads 14, 25. List of reference symbols

[0054] 1 Profile piece 2 Profile piece 3 Profile piece 4 Profile piece 5 Window or door frame 6 Machining tool 7 Machining tool 8 Machining tool 9 Machining tool 10 Machining tool 11 Machining tool 12 Machining tool 13 Machining tool 14 Machining head 15 Swivel axis 16 Positioning shaft 16a Positioning shaft end 16b Positioning shaft end 17 Tool holder 18 Tool holder 19 Drive 20 Drive 21 Tool axis 22 Tool axis 23 Shaft end 24 Shaft end 25 Machining head 26 Actuator 27 Clamping plane 28 Actuator 29 Pinion 30 Toothed belt 31 Gear 32 Frame support 33 Clamping device 34 Centering device 35 Machine frame 36 Slide 37 Housing 38 Swivel axis X-axis Y-axis Z-axis Q1, Q2Rotation or swivel axis

Claims

1. Device for machining frames welded from profile pieces (1, 2, 3, 4), such as window or door frames (5) made of plastic, having at least one machining head (14, 25) and machining tools (6, 7, 8, 9; 10, 11, 12, 13) arranged thereon which can be advanced to the respective machining position on the frame (5), wherein the machining head (14, 25) is pivotable about an axis (15) and has a positioning shaft (16) which is arranged at an angle to the pivot axis (15) and on which the machining tools (7 - 13) are arranged, characterized in that the positioning shaft (16) extends on both sides of the machining head (14, 25) with machining tools (7 - 13) at both end regions (16a, 16b) of the positioning shaft (16), wherein the axes (21, 22) of the machining tools (7 - 13) are oriented perpendicularly to the axis of the positioning shaft (16).

2. Device according to Claim 1, characterized in that the positioning shaft (16) with machining tools (7 - 13) arranged thereon can be positioned in the direction of rotation by means of an actuator (26).

3. Device according to Claim 1 or 2, characterized in that the pivot axis (15) and the axis of the positioning shaft (16) are oriented substantially perpendicularly to one another.

4. Device according to one of the preceding claims, characterized in that the positioning shaft (16) has a pivot axis (38) for pivoting the positioning shaft (16).

5. Device according to one of the preceding claims, characterized in that the pivot axis (15) is oriented perpendicularly to the clamping plane for the frame and the axis of the positioning shaft (16) is oriented parallel to the clamping plane.

6. Device according to one of the preceding claims, characterized in that the machining head (14) can be moved in three axes (X, Y, Z), preferably on a carriage (36) which can be moved in three axes (X, Y, Z).

7. Device according to one of the preceding claims, characterized in that the positioning shaft (16) is designed to be adjustable in its axial direction relative to the machining head (14, 25).

8. Device according to one of the preceding claims, characterized in that the tools (7 - 13) are arranged on tool carriers (17, 18) arranged on both positioning shaft ends (16a, 16b).

9. Device according to one of the preceding claims, characterized in that fixed and / or motor-driven tools (10 - 13 or 6 - 9) are provided.

10. Device according to one of the preceding claims, characterized in that in each case at least one of the tools (6 - 9), at least in a rotational position of the assigned positioning shaft end (16a, 16b), projects at least in certain regions with respect to the machining tool head (14, 25).

11. Device according to one of the preceding claims, characterized in that at least one motorized drive, in particular an electric drive (19, 20), is provided for the machining tools (6 - 9), with a continuous output shaft having tool holders, which are arranged on both shaft ends (23, 24), for rotating machining tools (6 - 9).

12. Device according to one of the preceding claims, characterized in that on at least one positioning shaft end (16a, 16b) there are provided at least two motorized drives (19, 20) for machining tools (6 - 9) which are arranged behind one another in the axial direction of the positioning shaft (16) and are oriented with their tool axes at an angle, preferably at a right angle, to one another.

13. Device according to one of the preceding claims, characterized in that the positioning of the positioning shaft (16) occurs under CNC control.

14. Device according to one of the preceding claims, characterized in that at least two machining heads (14, 25) are provided for the preferably simultaneous machining of the corners and / or the side profiles of the frame (9).