CS223909B1 - Method of fixing the workpiece in respect of the tool by grinding the prefabricated workpieces of the teethed wheels - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for aligning pre-machined gearwheels and other profiles which are ground by a worm grinding wheel. The method according to the invention is used in particular in machines operating in an automatic cycle with automatic workpiece change.

Hitherto known methods of ensuring the correct position of the workpiece relative to the tool when grinding the pre-machined gearwheel workpiece are to place the pre-machined workpiece on the clamp and to set the clearance, i.e. to ensure the requirement for even clearance clearance between the two sides. First, the operator moves the pre-machined workpiece to a rotatably clamped workpiece while the machine is stationary, ie without rotating the grinding wheel, and performs the clearance with little play. It then starts to turn the grinding wheel and carefully, again by hand, approaches and monitors whether both sides spark. This operation must be carried out without cooling for the spark to be clearly visible. However, this causes rapid clogging of the grinding wheel with contaminated material after quenching and requires increased attention by qualified personnel. Another known method of ensuring the correct position of the workpiece with respect to the tool is carried out by first detaching a pre-machined workpiece on the fixture by first locking it to the correct position by means of a special device based on the touch sensor principle. The machine is located directly on the machine. The disadvantage of this method is that this system can only be used for single cutting grinding technology, where the grinding wheel has the desired tooth gap formed on its periphery. However, this system is not usable for grinding gears with a worm grinding wheel.

These disadvantages are overcome by the method of aligning the workpiece relative to the tool when grinding pre-machined gearwheel and other profiles, which is based on the pre-machined workpiece being rotatably but axially displaced with a determined kinematic constraint and with a specified clearance between the workpiece and the grinding wheel. The workpiece is brought into free movement with the stationary grinding wheel in the fixed axis of the workpiece by movement of the grinding wheel, the workpiece turning is activated by turning the grinding wheel and the radial recess is activated until the clearance between the grinding wheel and the workpiece consolidation of the kinematic bond, followed by another grinding cycle. A further feature is that the relative movement of the preformed workpiece and the grinding wheel is carried out by the grinding wheel in a direction parallel to the workpiece axis of the preformed workpiece.

The method of ensuring the correct position according to the invention ensures the possibility of equipping the machine with an automatic workpiece change and thus it is a prerequisite for the inclusion of such machines in automatic lines. A further advantage is that the first contact of the grinding wheel with the pre-machined workpiece takes place with cooling on and thus does not clog quickly.

The method is described in more detail in the accompanying drawing, in which the pre-machined workpiece is approached on the grinding wheel.

To ensure the correct position of the workpiece relative to the tool, proceed as follows:

- the distance of the workpiece axis 6 from the axis J is adjusted so that when the preformed workpiece 1 is set on the fixed workpiece axis 2, there is a tooth play between the preformed workpiece J and the grinding wheel 5. This tooth clearance is adjusted by means of a pre-adjustable stop system which secures the desired position of the tool relative to the pre-machined workpiece;

- the pre-machined workpiece is set on the clamping dark without locking so that the kinematic coupling between the workpiece and the tool is not reinforced;

- the pre-machined workpiece J is automatically approached in direction 2 parallel to axis 3 (alternatively, this parallel movement can be replaced by a large radius circular movement) into the grinding wheel 1 ',

upon contact of the preformed workpiece J with the grinding wheel, by moving in the direction 2, the preformed workpiece 1 is rolled onto the grinding wheel so that the preformed workpiece 1 gets into free grip with the grinding wheel 2;

when the workpiece is conveyed to the fixed workpiece axis 2, cooling of the workpiece J, turning of the grinding wheel 1, radial recess is started and grinding is started with the radial recess always switched on until grinding both sides of the teeth. This is about 0.1 mm material removal;

- after this amount of material has been removed, both tooth flanks are always ground and the radial feed is switched off and the workpiece clamp 1 is secured. This also strengthens the kinematic coupling between the workpiece and the tool;

- the pre-machined workpiece 1 or the grinding wheel 1 is retracted at one of the extreme dead centers and the radial recess moves to the full depth of the add-on and the radial recess is switched off;

- the start of vertical profile travel is started and the preformed workpiece 1 is ground;

- disengaging, switching on the cooling and axial adjustment of the grinding wheel 2 to a new unused part (stepping);

- automatic removal of the mandrel with the ground pre-machined workpiece 1.

In the case that the finished workpiece 1 still has to be finished after a radial recess and a vertical traverse (small finishing allowance), the following operations are performed:

- moving the grinding wheel 5 to the median plane of the width of the gear;

- moving the pre-machined workpiece 1 or grinding wheel 5 to one of the extreme dead center points;

- carrying out the finishing strokes so that the full depth of the allowance is gradually approached by radial infeeds;

- disengagement, stopping, cooling and partial re-axial adjustment of the grinding wheel 5;

- automatic removal of darkness with the ground pre-machined workpiece 1.

Alternatively, the same effect can be achieved by moving the grinding wheel 5 in the direction A to the pre-machined workpiece J.

The method of ensuring the correct position of the workpiece with respect to the tool according to the invention can be used in gear grinding machines with worm grinding wheels.

Claims (2)

SUBJECT OF THE INVENTION A method of aligning a workpiece with respect to a tool for grinding pre-machined gearwheels and other profiles by a rolling method with a grinding worm wheel, wherein grinding is performed by vertical strokes or radial grooves, characterized in that the pre-machined workpiece (1) is rotatably loosened but axially non-displaceable and with a specified clearance of the axial distance of the workpiece (1) and the grinding wheel (5), where the relative work with the grinding wheel (5) is brought into free engagement with the stationary grinding wheel (5) in a fixed axis (7) of the workpiece, by turning the grinding wheel (5) by turning the workpiece (1) and actuating a radial recess until the clearance between the grinding wheel (5) and the workpiece (1) is limited; the next grinding cycle. Workpiece alignment method according to claim 1, characterized in that the relative movement of the preformed workpiece (1) and the grinding wheel (5) is performed by the grinding wheel (5) in a direction (4) parallel to the workpiece axis (6) of the preformed workpiece (1). .