Patent Application
20090025452
The invention relates to a device for repeatedly machining several workpieces arranged one next to the other, in particular, bar-shaped or tubular workpieces, according to the preamble of claim 1.
With such a device, several workpieces to be machined can be, e.g., bent, punched, perforated, enlarged, provided with threads and screws, flattened, and also tested. Such processes are typically performed in separate final processing machines and connected presses. For mass-produced parts, these are combined in large-scale transfer installations, wherein then only one work process is performed for each final processing station. For all of the other processes and inspections, a single processing device is then used. Therefore, relatively large and complicated installations are produced. In contrast, for small-batch and medium-batch production, as a rule, final processing stations with a workpiece clamp and an axial revolver are used for the axial tools. Here, however, because the processes are performed one after the other, a relatively long cycle time is produced. Such processing devices are therefore not economical for larger batches.
The problem of the invention is to devise a device for repeated machining of the type named above, which can be used economically for both smaller batches and large batches.
This problem is solved by a device with the features of claim 1. Preferred refinements and advantageous embodiments of the invention are the subject matter of the subordinate claims.
For the device according to the invention, several workpieces arranged one next to the other are clamped between a bottom part and a top part, which can move centrally and which is constructed, e.g., as a press slide. The device contains a tool support, which contains a support plate that can move relative to the bottom part and which has several tool receptacles arranged one next to the other and one above the other for axial tools. A drive for actuating the axial tools is further allocated to the tool support. In this way, arbitrary processes can be performed at the same time on several processing stations and/or one after the other through axial tools lying one above the other. Thus there is the possibility of combining parallel and successive production steps arbitrarily. In this way, a combination of the advantages of large-batch and small-batch production installations is possible. Through the simple displacement of the support plate constructed like a tool register, the workpieces can also be processed at the individual processing stations without complicated tool exchange in several steps.
In an especially preferred construction of the invention, the top part is guided so that it can move vertically by means of two side cheeks connected rigidly to the top part on two side parts of a frame. The side cheeks extend essentially across the entire height of the side parts and are guided across their entire or nearly entire length. This allows an especially stable and exact guidance of the top part.
The support plate can also be easily adapted to different requirements through expansion. It can be constructed, e.g., in one piece or from several segments that can also move separately. The device according to the invention also has an extremely compact and simple construction, which allows high production rates.
The drive for actuating the axial tools is advantageously formed by a traverse, which can move horizontally on a frame and which is driven by a servomotor. In a preferred construction, the lifting drive for moving the top part contains a drive shaft, which is mounted so that it can rotate in the bottom part and which can be rotated by a motor, with eccentric pins, which each engage in an elongated hole of the side cheeks by means of a sliding piece. However, other suitable lifting drives could also be provided.
In the bottom part and/or the top part, additional drives for the workpiece machining can also be housed.
Additional details and advantages of the invention emerge from the following description of a preferred embodiment with reference to the drawing. Shown are:
The device shown schematically in a side and front view in
As emerges from
According to
On the bottom part 2 and on the top part 3, several bottom and top workpiece holders 18 and 19, respectively, are arranged one next to the other—shown only schematically in FIGS. 1 and 2—between which the workpieces 1 are held and/or processed. Between the bottom part 2 and the top part 3 there are several processing stations, which are arranged one next to the other and in which the workpieces 1 are processed in successive steps. The transport of the workpieces 1 from one processing station to the next is realized by a transfer rail 20, which is shown in
The workpiece holders 18 and 19 can be easily exchanged by not-shown holding rails and locking pins. The lower workpiece holder 18 can be constructed, e.g., as a hollow shape and the upper workpiece holder 19 can be constructed as a counterpart to the hollow shape. They are used for deforming and/or fixing the workpiece 1 during the processing, but can also include additional processing devices or tools, through which the workpieces 1 are processed either by means of the downwards movement of the top part 3 or by additional drives in the bottom part 2 and/or the top part 3. Thus, additional drives 22 and 23, which are shown with dashed lines in
On the back side of the frame 6, a tool support 24 shown in
In
The drive 26 shown in
The additional drives 22 and 23 likewise shown in
In the following, the function of the device described above will be explained:
The feeding of the workpieces 1 to be machined can be realized from a not-shown parts bin, from the bar, or from a coil after having been separated. By means of the transfer rail 20, which is provided with the gripper 21 and through which extend lateral passages 45 and 46 shown in
After placement of the workpieces 1 on the lower workpiece holders 18, the top part 3 constructed as a press slide is moved downward with the upper workpiece holders 19 attached to this top part through rotation of the drive shaft 14. Here, just through the closing motion of the upper workpiece holders 19, processing can take place, wherein the workpieces 1 then must be fixed by means of a hold-down clamp guiding the upper workpiece holders. The machining, however, can also be performed only after the closing of the upper workpiece holders 19 by tools integrated in the workpiece holders. Theses tools are activated by the additional drives 22 and 23 arranged in the bottom part 2 and/or in the top part 3 by means of the tappet 41 activating the tools. The movement of the tappet 41 is generated by means of the cam plate 42 and the rocking lever 40 driven by the motor 43. The cam plate 42 can include, on its periphery, several cams, which allow additional individual movement for different processes.
The final processing of the workpieces 1 is realized by the axial tools 25 arranged in the support plate 29. These tools can involve tools for stamping, enlarging, flattening, etc., but also tools for the production of threads, for the mounting of nuts, for testing, or the like. The movement for activating the axial tools 25 is generated by shifting the traverse 34. The axial tools themselves are supported in the tool receptacles 30 of the support plate 29.
If, with the aid of the traverse 34 an axial lift is realized, the traverse 34 can be moved back and the support plate 29 can be shifted up or down into a next tool position. Thus, also without complicated tool exchange, successive work processes can be performed at one processing station and/or simultaneously at different processing stations. For shorter workpieces, a turning station can also be provided, through which the workpieces are turned for processing at both ends. For longer workpieces, two devices can be set opposite each other in such a way that processing is possible at both ends.
When processing has ended, the workpieces 1 are first fixed with the aid of the gripper 21 attached to the transfer rail 20 before the top part 3 is moved upward. After opening the top part 3, the workpieces 1 are removed from the lower workpiece holder 18 by the gripper 21 arranged on the transfer rail 20 and transported to the next processing station. For simpler processing, processing stations can also be skipped. Then a new processing cycle can begin.
By the device described above, complete processing from the coil up to the complete workpiece can be performed, wherein, in addition to the final processing, other processing steps, such as, e.g., punching, stamping, bending, testing, and the like, are also possible. The device is extremely flexible and can be used universally.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2005 057 658.3 | Dec 2005 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP06/11217 | 11/23/2006 | WO | 00 | 7/17/2008 |
