DE19510424A1 - Automatic rotary indexing table - Google Patents

Description

The invention relates to a rotary table machine for processing of workpieces, in particular for polishing and grinding hollow-shaped workpieces (hollow goods) consisting of a incrementally movable control table with on the table at his Circumferentially arranged angle heads, each with a motor drivable axis of rotation for recording and rotating the movement piece and processing units arranged around the table according to patent P 43 32 663.3.

In these known rotary table machines are on the Depending on the task and dimensioning, an index table certain number of angular heads, each with a motor driven axis of rotation, which is rigid relative to the control table is arranged. The work to be processed on the index table piece is at an entry station with the axis of rotation of a freed angle head connected and by the associated engine rotated. By turning the switch The work to be processed arrives at a table around an index level piece in the work area of the first processing machine. Depending on the machining process, the tool is now the Assign machine to the workpiece so that the corresponding surface of the workpiece in the intended Way can be edited. The motor of the angle head drives its axis of rotation and thus the hollow one attached to it Workpiece so that a rotationally symmetrical surface of the Processing is continuously fed. Before the control table can carry out its next step all processing tools, which are arranged around the table are moved back so that the workpiece can be Tool can be moved to the next one. In some cases A simple retraction of the tool or the is sufficient entire processing station. In other cases, three dimensional movements of the tool in space so that the path for the workpiece to the next Index station can be released.  

The individual processing machines are built on columns and assigned to the rotary table. To perform a job process, the processing machines therefore need at least six degrees of freedom for the motion sequences to the machining tools such as a buffing wheel to be able to bring the work position to the workpiece and around in one step of the indexing table a movement in To be able to carry out space so that the path for the workpiece can be shared from one workstation to another.

The work tool is usually in the top third of the Column of a work station and the work or Contact pressure is exerted from this point. Hereby there is a considerable leverage effect, so that tension can occur, which can only occur through a corresponding mecha African interpretation can be absorbed or compensated. If such a system is to be automated, everyone must changeable degree of freedom can be automatically adjustable, whereby corresponding control rules for each of these processes links with the respective drives must be available. In addition, the degree of wear must be measured continuously and be balanced. For the automation of such known system therefore results in considerable effort.

Because of this structure, the actual tools, such as For example, the polishing and grinding wheels that a Ver are subject to wear, only with a relatively small through be designed knife. There are therefore many components too monitor and regulate what makes such a facility except is neatly expensive.

The main patent is therefore based on the task, the structure to simplify a rotary table machine considerably, whereby when applying the solution set out below Task according to the invention in surprising ways advantages and result in further advantageous technical possibilities.  

The solution to this problem is the patent claims of Main patent.

In the case of the rotary table machine mentioned at the outset at least one angle head with its motor-driven Swivel the axis of rotation about its zero position in the horizontal plane trained bar. This creates the possibility of Assignment of the workpiece to the tool essentially from Perform round table and control centrally, so that the Workstation tools only one-dimensional Need to perform the sequence of movements, whereby three loading degrees of freedom of movement are eliminated at each workstation can. This also eliminates those for every degree of freedom Movement required drives and an automatic Regulation also the associated control loops with their measuring sensors soren. This advantageously results in Possibility of tools, such as the polishing and grinding wheels train much larger, since the machine tool now trained with the appropriate stability and stability can be detected.

In a development of the invention it is proposed according to the additional application that at least one angle head with its axis of rotation driven by an electric motor
a: has a drive for performing an oscillatory movement about its zero position in the horizontal plane,
b: and has a drive for performing a linear advance movement.

This makes the angle head with its motor-driven Rotation axis in both vertical and horizontal planes pivoted, which further possibilities of Positioning and assignment of the workpiece to the tool surrender. This also increases the number of work to be done Workpieces essential in terms of their design expanded.  

Advantageously, the entire pivoting operations are the Angle heads on the control table can be controlled electronically trained, and can with the index-wise progression of the Switch table be advantageously coupled. At work All workpieces are thus the step of the indexing table on the control table in their new working position at the same time brought while the tools are in relation to the work pieces just drive back and forth.

The swivel range of the angle head is horizontal and vertical plane gradually at least 90 ° around its Zero axes. This turns one out for all operations reaching positioning achieved.

The processing units arranged around the control table are trained as polishing or grinding machines, the An drive shaft of the grinding or polishing wheel for implementation a feed movement of the disk on at least one Swing arm is stored. This allows a one-dimensional Movement sequence in forward and backward direction in easier Realize way, making the machining units essential are simplified.

The polishing or grinding wheel shows in its original Condition preferably a diameter of about 1000 mm and one Width of 150 mm. Such a dimensioning could the known systems so far not for reasons of stability can be achieved. The use of grinding or polishing Disks of such dimensions open up a number of advantages. The disc diameter can now be below 600 mm be worn, which achieves a high level of economy is, because the large disc diameter long service life enable. Furthermore, the rotational speed can be the same fro work speed and the polishing operation can be done at lower temperatures, which means Workpiece and tool are protected.  

The invention is explained in more detail with reference to the drawing. Here show:

Fig. 1 is a plan view of the rotary table machine with control table and processing machines available around the table, and

Fig. 2 is a side view of an angle head with its drives in a schematic representation.

Fig. 1 shows a plan view of a rotary table machine 1 with its indexing table 103 and the table arranged machines 104th In the present example, according to FIG. 1, eight processing machines 104 are arranged around the indexing table 103 , which are of the same design and each of which carries out a special work operation on the workpiece 105 .

Angular heads 100 are arranged on its circumference on the circumferentially rotating indexing table 103 at a distance from one another which corresponds to the distance between the processing machines 104 , so that an angle head 100 is assigned to each processing machine 104 in the rest position of the indexing table. A motor 106 is rotatably mounted on each angular head 100 , and its motor-driven axis of rotation is designed to be pivotable about its zero position in the horizontal plane. In the same way, the drivable axis of rotation can also be designed to be pivotable in the vertical plane. The further movement possibilities of the angle head will be described later with reference to FIG. 2.

The pivoting movements of the motor 106 on the angle head 100 can be carried out by purely mechanical, pneumatic, hydraulic or CNC-controlled movements. This can be done using actuating cylinders or corresponding freely programmable drives. With each movement of the indexing table, a corresponding pivoting movement of the motor 106 takes place, provided that a change in position of the workpiece to be machined is necessary for the assigned machining unit 104 .

The possibility of the pivoting movement of the angle head 100 also results in a simplified loading and removal of the workpiece 105 . For this purpose, the axis of rotation is moved in the radial direction to the index table 103 , so that easy handling of the loading and unloading process is achieved. Now that the workpiece 105 to the processing unit 104 performs the required positioning movement, the processing need units 104 only in each case perform a linear radial movement to once release the workpiece after processing and to bring in the new workpiece, the tool in the working position and to adjust the working pressure . For example, when polishing an INOX or aluminum pot, a wide variety of work steps can be easily set, such as the machining of the lateral surface, the pouring edge, the base radius and the base surface treatment. Furthermore, cross grinding can be carried out in a simple manner, for which the setting of an inclined position upwards and downwards is required.

FIG. 2 shows a side view of an angle head 100 with its drives in a schematic representation.

The motor 10 is used for feeding the head shaft 8 in the horizontal plane. The head shaft 8 carries the workpiece to be machined. A proximity switch 2 limits the end deflection of the head shaft 8 and stops the motor 10 . The motor 6 provides the vertical movement component of the head shaft 8 , while the motor 3 performs an oscillatory movement in the horizontal plane. The power is transmitted via a toothed belt stage 5 . A proximity switch 4 ensures the limitation of the swiveling movements.

Overall, with the angle head or the head shaft 8, a wide variety of movement processes in space are possible, namely a swiveling movement to the right and left of 0 ° over 45 ° to 90 °, vertical lifting, adjustable oscillation, and an inclined position of the head for implementation of cross grinding work, and finally a rotating movement around the central axis.

Claims (8)

1.Rotary indexing table machine for machining workpieces, in particular for polishing and grinding hollow-shaped workpieces (hollow goods), consisting of a step-by-step movable indexing table with angular heads arranged on the circumference of the table, each with a motor-driven axis of rotation for receiving and rotating the workpiece and around it Table arranged processing units, according to patent P 43 32 663.3, characterized in that at least one angle head ( 100 ) with its electromotively driven axis of rotation
a: has a drive for performing an oscillatory movement about its zero position in the horizontal plane,
b: and has a drive ( 10 ) for carrying out a linear feed movement. 2. Automatic rotary indexing table according to claim 1, characterized in that at least one angle head ( 100 ) with its motor-driven axis of rotation is designed to be pivotable in the vertical plane. 3. rotary indexing machine according to claim 1 or 2, characterized in that the pivoting operations of the angle heads ( 100 ) with the index-wise progression of the indexing table ( 103 ) are coupled. 4. rotary indexing machine according to claim 1, 2 or 3, characterized in that the pivoting range of the angle heads ( 100 ) in the horizontal plane is gradually at least 90 °. 5. rotary indexing machine according to claim 1 to 4, characterized in that the polishing or grinding wheel ( 84 ) in its original state has a diameter of about 1000 mm and a width of 150 mm. 6. rotary indexing machine according to claim 1 or one of the preceding claims, characterized in that the processing units ( 104 ) have a device for controlling the contact pressure between the workpiece ( 105 ) and tool ( 84 ), which with a longitudinal slide adjustment of the polishing or grinding wheel ( 84 ) is combined. 7. rotary indexing machine according to claim 1 or one of the before pending claims, characterized in that the Contact pressure control to a presettable pressure is automatically adjustable. 8. Automatic rotary indexing table according to claim 1 to 7, characterized in that the processing unit ( 104 ) for maintaining the speed of attack of the tool ( 84 ) on the workpiece ( 105 ) has an automatic speed control working via frequency converter.