DE2122798B2 - Method for producing a flat workpiece of a certain thickness, in particular brake disks for motor vehicle disk brakes - Google Patents

Description

next level. The feed is switched off here for a different purpose than in the case of the invention, and the fire occurs only by chance, but it doesn't matter.

In the following an embodiment of the invention is explained in more detail with reference to a drawing.

The drawing shows a radial section through a brake disk 1, the braking surfaces of which are to be machined plane-parallel at the same time. Expressed geometrically, it involves the simultaneous machining of zv / ei plane-parallel circular ring surfaces of the same or almost the same dimensions, the axes of which are aligned with one another. Usually, the distances Dl to Y, DZ to Y from the clamping point Y and D1 to D 2 are closely tolerated.

Starting from the finished dimension Z) 1 to D 2, the grinding allowances are made in several processing stages removed, the following values being appropriate with regard to the thickness of the layers to be worked off have proven:

First processing stage:

Grinding allowance AIB 1 φ AIB 2
(Roughing)

0.1 mm.

Second processing stage;

Grinding allowance B ICl = BZCZ ^ 0.1 mm
(Finishing)

Third processing stage:

Grinding allowance ClDl = CZDZs ^ 0.05 mm
(Fine finishing)

The two grinding wheels 2, 3 are

Set machining pressure on the plane surfaces A 1 and / 42. Then the feed of that grinding wheel is switched off and this blocked, which first reached the dimension B (Bl or BZ) as the distance from Y , while the other grinding wheel

disk is pushed forward until dimension B (BZ or Bl) has also been reached on its side. Then the feed of this grinding wheel is switched off and the brake disk 1 is deflated on both sides. This process again

ao then repeats itself in the context of the second and third processing stages, which lead from B to C and from C to D. The grinding allowance between B and C corresponds roughly to that between A and B, between C and D it is less. aside from that

What can be done in the third processing stage when editing of the workpiece to the dimension Dl -D2 Measurement control is used.

1 sheet of drawings

Claims (1)

1 2 Brakes, and in a single win- Claim; visible of the infeed of the segment grinding wheels uninterrupted operation, with the delivery Method for producing a flat work- the segment grinding wheels only after reaching the Piece of a certain thickness, in particular braking 5 entire washers fixed relative to a fixed point of motor vehicle disc brakes, working dimension via the nozzle measuring device the workpiece is broken in at a clamping point. This can result in a lack of parallel planar tension, from both sides with grinding wheels in the lelity or, inadmissible deviations with regard to Face grinding process is processed and result with one of the form accuracy. Indeed must With this known grinding unit, the finishing process is a first step with adjustable processing pressure subject and the preliminary fine machining of the brake disks take place in one push after reaching a first, compared to separate machining amount, namely in A downstream superfinishing station defined at a fixed point in which dimension on one side of the workpiece on this to achieve high uniformity of the ground side is switched off, while on the other 15 fenen brake discs a honing after time by side the workpiece is guided under the set guide. working pressure is further processed until the invention is therefore based on the object The previously known process for the production of ebeist achieves a specified processing level here, characterized in that the NEN workpieces of a certain thickness, in particular Grinding disks (2, 3) when switching off the front 20 brake disks of motor vehicle disc brakes, Thrust are blocked in their positions and so continue to train that the workpieces under Wahdabei the workpiece (1) is fired out and tion of high dimensional accuracy, in particular with respect to that by repeating the described work on thickness and plane parallelism, on a single one steps the workpiece (1) can be pre-machined and finish-machined with the same machine, or reduced feed until reaching the 35. This object is achieved by the invention that the The finished dimension is ground down further. Grinding wheels when switching off the feed in their positions are blocked and the workpiece is fired out and that by re- the work steps described 30 pieces with the same or reduced feed up to ground down further to achieve the finished dimension. The invention relates to a method for producing. position of a flat workpiece of a certain thickness, according to the teaching of the invention, the in particular brake disks of motor vehicle grinding pressure of the opposing grinding disk brakes, with the workpiece on a 35 disc during any phase of the machining from Clamping point clamped, from both sides with workpiece, but always only from the bearings Grinding wheels machined using the face grinding process, the grinding wheels are added and carried out and with adjustable processing pressure, the workpiece is always processed with the same first Subject to the machining process and the pressing pressure, so that a lateral compression of the Feed after reaching a first workpiece compared to 40 and thus in particular thinner-walled A fixed point defined processing dimension brake disks is avoided. Particularly good results one side of the workpiece on this side results in terms of the dimensional accuracy is held, while on the other hand the rest is achieved when the workpiece to workpiece next only pre-sanding is carried out under the set processing pressure, so that further is processed until a predetermined 45 direct processing steps on both sides of the workpiece Processing measure has been reached. the same grinding allowances are available. This method is the one in the journal »Tech- Well is from the British patent specification Bische Rundschau «No. 6, from 14.2.1964, on p. 9 1 084 842 a machine for cylindrical grinding of described special machine for fine machining crankshafts known in which in different based on brake disks, which have a grinding step automatically with finer advance with segment grinding wheels. The Seg thrust speeds are worked. This completely tient grinding wheels grind the two sides of the non-generic state of the art is the solution Iu machining brake disks in a single of the above task, however, not without further ado Operation. In doing so, they take the work to be found on each page, because there neither is that of the invention Itoff according to the measurements. The underlying task for grinding 55 is addressed yet the brake disks are centered on both sides between the individual grinding workbenches tensioned and carried out according to plan between the segment loops, but rather only sliced there turned. Furthermore, hydraulic deliveries are occasionally and randomly results :. With the known measuring devices provided which the two grinding machines is namely one for each crankshaft bearing Infeed spindles independently of one another until a separate grinding wheel is assigned. All crankshafts between The bearings located on the two segment grinding wheels are machined at the same time. After the first Borrowed nozzle measuring device switches off the infeed, coarse grinding of the grinding wheels are those grinding add-ons see corresponding measuring nozzles between disks with regard to their feed stopped, see the segment grinding wheels. Each measuring nozzle which already measures the specified amount of suction the distance between a fixed point and the 65 range. Only after the rest of the sanding surface the rotating segment grinding wheel. disks have reached this processing tolerance, The grinding unit of this well-known special machine work all grinding wheels with reduced However, only a preliminary processing of the feed rate in the next processing