WO2019072334A1

WO2019072334A1 - Honing machine and use of a honing machine

Info

Publication number: WO2019072334A1
Application number: PCT/DE2018/100730
Authority: WO
Inventors: Michael Schumm; Alexander SCHÄFER; Manuel GÖPFERT; Sandro KRINES
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-10-13
Filing date: 2018-08-23
Publication date: 2019-04-18
Also published as: JP2020524084A; CN111212704B; DE102017123824A1; DE102017123824B4; CN111212704A; JP6910482B2

Abstract

A honing machine (10), in particular a plunge honing machine, for honing cylindrical, spherical and/or conical surfaces, in particular parts of a rolling bearing, said honing machine (10) having a machining tool (16) for machining a workpiece (14) at a first machining location relative to the workpiece (14), and having an eddy current test probe (28) for the crack testing and/or grinding burn testing of the workpiece (14) at a second machining location relative to the workpiece (14), said second machining location being offset with respect to the first machining location, in particular in the circumferential direction. The integration of the eddy current test probe (28) into the honing machine (10) allows cost-effective production and testing of high-precision surfaces.

Description

Honing machine and use of a honing machine

The invention relates to a honing machine and a use of a honing machine, with the help of which cylindrical, spherical, conical and / or conical surfaces can be machined by honing.

From EP 1 994 362 B1 a honing machine with an integrated measuring system is known in which a gap between an optical sensor of the measuring system and a cylindrical surface to be checked is filled by a transparent liquid.

There is a constant need to produce high-precision surfaces cost-effectively.

It is the object of the invention to show measures that allow cost-effective production of high-precision surfaces. The object is achieved by a honing machine with the features of claim 1 and a use with the features of claim 10. Preferred embodiments of the invention are set forth in the dependent claims and the description below, each individually or in combination constitute an aspect of the invention can.

According to the invention a honing machine, in particular Einstechhonmaschine for honing cylindrical, spherical, conical and / or conical surfaces, in particular parts of a rolling bearing provided with a machining tool for machining a workpiece at a first processing point relative to the workpiece and an eddy current test probe for crack testing and / or grinding burn test of the workpiece at a first processing point, in particular in the circumferential direction, offset second processing point relative to the workpiece. The eddy current probe is able to perform an eddy current test, which makes it possible to induce eddy currents in an electrically conductive workpiece by an alternating magnetic field generated by a coil in the workpiece and to detect with a sensor the eddy current density of the magnetic field generated by the eddy current. In particular, the eddy current test probe can measure the amplitude and the phase shift of the detected signal relative to the excitation signal and conclude from a sufficiently great deviation of the measured values from stored nominal values of a good part on a cracking and / or grinding burn. Here, the knowledge is exploited that a crack in the workpiece and grinding burn leads to a changing conductivity of the workpiece, which leads to a changed magnetic field of the eddy currents induced in the workpiece. In particular, it can be taken into account that parts of a roller bearing are usually made of a metallic material, which are basically electrically conductive and therefore can be measured without contact using the Wirbelstromprüfsonde. A visual inspection and the associated difficulties to perform the optical test error-free, can be avoided.

By integrating the Wirbelstromprüfsonde in the honing machine, it is also not necessary to remove the workpiece after honing from the honing machine and insert in a separate testing machine. Damaging the surfaces by repositioning the workpiece for testing can be avoided, thereby reducing the risk of rejects. Here, the knowledge is exploited that it may already be sufficient to put the processing point for the Wirbelstromprüfsonde to the processing point for the machining tool in the circumferential direction, so that the machining tool and the Wirbelstromprüfsonde not interfere with each other. It is even possible in principle that the machining tool and the Wirbelstromprüfsonde are simultaneously in operation, so that the Wirbelstromprüfsonde already during the machining of the workpiece by the machining tool can check the generated surface of the workpiece. This makes it possible to perform the machining by the machining tool until the Wirbelstromprüfsonde has found a sufficient quality of the workpiece or the eddy current probe has determined that the desired quality, for example by damage to the Workpiece, can no longer be achieved. The machining of the workpiece can be reduced to the required minimum, which can reduce the product manufacturing times and / or wear of the machining tool. By integrating the eddy current probe in the honing machine cost-effective production and testing of highly accurate surfaces is possible.

The workpiece can for testing the eddy current in particular in the same place remain rotatable, where the workpiece is for processing by the machining tool. For this purpose, the first processing point and the second processing point can essentially be positioned offset from each other only in the circumferential direction on the lateral surface of the workpiece. This makes it possible for the processing and the examination of the workpiece to provide a common processing station. In this case, only one machining station for the workpiece is preferably provided for the honing machine. But it is also possible that the workpiece after machining by the machining tool to another station within the honing machine, in particular horizontally and / or vertically, is offset so that the Wirbelstromprüfsonde can perform the eddy current test at the other station, while at the previous Station already the next workpiece can be edited by the machining tool. The eddy current test probe can, in particular at the other station, use an axis system actually intended for a further machining tool. In this case, it is preferably provided that only the eddy current test takes place at the other station using the eddy current test. In this case, the knowledge is utilized that the axial accuracy of a provided for attachment of the other processing tool holding arm of this axle system is sufficient to ensure a radial homogeneous distance of the eddy current probe on a controlled path.

In particular, the Wirbelstromprüfsonde is designed to be movable relative to the workpiece in the radial direction of the workpiece and / or in the axial direction of the workpiece, wherein the workpiece is designed to be rotatable about its longitudinal axis by means of a rotating device. The eddy current probe can be moved relative to the workpiece to be honed, similar to the honing tool. This makes it possible for a (further) machining tool to actually be Hene drive kinematics of the honing machine for the eddy current probe to use. For this purpose, it may already be sufficient to program a trajectory suitable for the eddy current test of the eddy current probe. For this purpose, the honing machine can already provide suitable input surfaces and / or interfaces.

Preferably, the machining tool for a rough machining of the workpiece is provided by roughing, while provided for a final machining of the workpiece by finishing fine machining tool is provided at a first processing point and the second processing point in the circumferential direction offset third processing point relative to the workpiece. As a result of the at least two-stage machining, in the roughing step with the aid of the machining tool, a desired shaping with a slight excess can be achieved quickly, so that in the subsequent finishing step with the aid of the finishing tool the surface finish desired by honing is produced. In this case, the fine machining tool only needs to pick up the slight excess remaining after roughing, so that the production time and the wear of the fine machining tool can be reduced. Due to the offset of the fine machining tool, no impairment of the machining tool and the eddy current probe by the fine machining tool is to be feared.

Particularly preferably, the machining tool for a rough machining of the workpiece is provided by roughing, while provided for a final machining of the workpiece by finishing finishing tool is provided at the second processing point, wherein the finishing tool and the eddy current test probe are immovably connected to each other. As a result of the at least two-stage machining, in the roughing step with the aid of the machining tool, a desired shaping can be achieved quickly with a slight excess so that the surface finish desired by honing is produced in the subsequent finishing step with the aid of the finishing tool , In this case, the finishing tool merely has to lift off the slight excess remaining after roughing, so that the production time and the wear of the fine grinding tool can be reduced. In this case, the eddy current test probe can be fastened to the fine machining tool at a suitable point, so that the fine machining tool and the eddy current test probe do not interfere with one another. Alternatively, the eddy current test on a separate support arm to the axis-controlled machining station, in particular instead of the finishing tool, be attached. In particular, the Wirbelstromprüfsonde is already positioned so close to the workpiece during the machining of the workpiece by the fine machining tool that the Wirbelstromprüfsonde can already make an eddy current test on the workpiece. Here, the knowledge is exploited that the axis accuracy of the processing station for the finishing tool is sufficient to ensure a radial homogeneous distance of the eddy current probe on a controlled path. The equipment and the space requirement can be kept low. In particular, the finishing tool is passed over a support arm, wherein the Wirbelstromprüfsonde is attached to the support arm. The provided for positioning and in particular for oscillating the finishing tool holding arm can thereby be used simultaneously for the attachment of the Wirbelstromprüfsonde. A separate holding arm for the eddy current test probe and a separate motor motor for the eddy current test probe can be saved. Instead, the motion motor provided for the finishing tool may also be used for the eddy current probe to allow the eddy current probe to descend the honed and inspected workpiece. Preferably, the finishing tool is configured as a tape finishing unit having a honing band. As a result, a particularly high surface quality can be achieved. In addition, the Bandfinisheinheit several pulleys on which the Honband is guided along and can be rotatably mounted on a support arm or other component. In particular, this support arm can be used to secure the eddy current test probe. For example, the belt finisher unit may have a gallows-shaped frame for rotatably supporting the pulleys, so that the frame provides enough suitable attachment points to secure the eddy current test probe in a suitable location without the hoist. to be affected by the Bandfiniseinheit. The finishing tool may alternatively be configured as a stone.

Particularly preferably, the eddy current test probe is coupled with a stop device for stopping the honing machine when the eddy current probe detects inadequate workpiece properties of the workpiece. The honing machine can be automatically stopped in order to sort out the workpiece with the insufficient workpiece properties as rejects, for example, manually. In particular, the eddy current test probe is coupled with a sorting device for sorting out a workpiece with test probe detected by the eddy current not sufficient workpiece properties. The workpiece with the insufficient workpiece properties can thereby be conveyed out of the honing machine via the customary way provided for this purpose, for example an outlet belt, wherein the sorting device, for example by adjusting a reject weir, can lead the rejected workpiece away from the further transport path. The sorting of reject workpieces can be done automatically, so that a manual sorting can be saved.

Preferably, the machining tool and / or the finishing tool for vertical honing and / or vertical and / or horizontal piercing is configured. As a result, in particular, the running surfaces can be produced in rolling bearings with a high surface quality.

The invention further relates to a use of a honing machine, which can be developed and further developed as described above, for the production of barrel rollers for a barrel roller bearing and / or cylindrical rollers for a cylindrical roller bearing and / or tapered rollers for a tapered roller bearing and / or inner rings for a rolling bearing and / or outer rings for a rolling bearing by honing. Particularly in the case of rolling bearings, a particularly high surface quality with the lowest possible roughness is desired on the running surfaces of the mutually contacting components that are movable relative to one another in order to achieve a long service life. At the same time, the honing on the honed surface produced during honing can lead to good tribological properties to lead. By integrating the eddy current probe in the honing machine cost-effective production and testing of high-precision surfaces of bearings is possible. The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. FIG. 1 shows a schematic plan view of a first embodiment of a honing machine and FIG

2 shows a schematic plan view of a second embodiment of a honing machine. The honing machine 10 shown in FIG. 1 has a driven turntable 12, in which a workpiece 14 to be honed is clamped and can be set in rotation. A vertical honing machining tool 16 can be moved in the radial direction to the workpiece 14 and oscillate in the axial direction, which coincides substantially with the vertical. In the illustrated embodiment, the machining tool 16 is used for roughing, while the finishing is done by a finishing tool 18 configured as a belt finishing unit. The finishing tool 18 can be moved in the radial direction of the workpiece 14 by means of a linearly guided Halterams 20 and oscillate in the axial direction. The finishing tool 18 designed as a band finisher unit has a honing band 22 which is guided along deflection rollers 24. The pulleys 24 are rotatably connected to a frame 26 which is part of the support arm 20. The machining tool 16 and the finishing tool 18 are circumferentially offset from each other at different processing locations, so that they can not interfere with each other.

In the embodiment shown in FIG. 1, a Wirbelstromprüfsonde 28 is provided on a to the machining tool 16 and the finishing tool 18 in the circumferential direction processing point, with their help after or during honing using an axis system of the processing station Non-contact crack test and / or a grinding burn test of the workpiece 14 can be performed. The eddy current test probe 28 can be moved relative to the workpiece 14 with the aid of a further holding arm in the radial direction and / or in the axial direction in order to be able to drive off and examine the entire surface of the workpiece 14.

In the embodiment of the honing machine 10 shown in Fig. 2, in comparison to the embodiment of the honing machine 10 shown in FIG. 1, the Wirbelstromprüfsonde 28 is attached to the frame 26 provided for the finishing tool 18 holding arm 20 so that the Wirbelstromprüfsonde 28 together with the Finishing tool 18 is moved. The further holding arm 30 is thereby saved and the accessibility to the workpiece 14 improved, so that the workpiece 14 can be more easily inserted manually or mechanically and / or removed.

List of numbers Honing machine

turntable

workpiece

processing tool

Finishing tool

Halteram

Honband

guide rollers

frame

Eddy current test probe

further holding arm

Claims

claims

1 . Honing machine, in particular Einstechhonmaschine, for honing cylindrical, spherical, conical and / or conical surfaces, in particular parts of a rolling bearing, with a machining tool (16) for machining a workpiece (14) at a first processing point relative to the workpiece (14) and an eddy current testing probe (28) for crack testing and / or grinding burn test of the workpiece (14) at a first processing point, in particular in the circumferential direction, offset second processing point relative to the workpiece (14).

2. honing machine according to claim 1, characterized in that the vortex test probe (28) in the radial direction of the workpiece (14) and / or in the axial direction of the workpiece (14) relative to the workpiece (14) is designed to be movable Workpiece (14) is designed to rotate about its longitudinal axis by means of a rotating device.

3. honing machine according to claim 1 or 2, characterized in that the processing tool (16) is provided for a rough machining of the workpiece (14) by roughing, while provided for a final machining of the workpiece (14) by finishing fine machining tool (18 ) is provided at a first to the first processing point and the second processing point in the circumferential direction offset third processing point relative to the workpiece (14).

4. honing machine according to claim 1 or 2, characterized in that the machining tool (16) is provided for a roughing of the workpiece (14) by roughing, while provided for a final machining of the workpiece by finishing finishing tool (18) on the second processing point is provided, wherein the fine machining tool (18) and the eddy current test probe (28) are connected to each other immovably.

5. honing machine according to claim 4, characterized in that the fine processing tool (18) via a holding arm (20) is guided, wherein the eddy current test probe (28) with the holding arm (20) is attached.

6. honing machine according to one of claims 3 to 5, characterized in that the finishing tool (18) is designed as a Honband (22) having Bandfiniseinheit.

7. honing machine according to one of claims 1 to 6, characterized in that the Wirbelstromprüfsonde (28) with a stop device for stopping the honing machine (10) is determined by the Wirbelstromprüfsonde (28) not sufficient workpiece properties of the workpiece (14).

8. Honing machine according to one of claims 1 to 7, characterized in that the Wirbelstromprüfsonde (28) is coupled with a sorting device for sorting out a workpiece (14) with the eddy current probe (28) found not sufficient workpiece properties.

9. honing machine according to one of claims 1 to 8, characterized in that the machining tool (16) and / or the finishing tool (18) for vertical honing and / or vertical and / or horizontal Einstechhonen is designed.

10. Use of a honing machine (10) according to one of claims 1 to 9 for the production of barrel rollers for a barrel roller bearing and / or cylindrical rollers for a cylindrical roller bearing and / or tapered rollers for a tapered roller bearing and / or inner rings for a rolling bearing and / or outer rings for a rolling bearing by honing.