AT514183A2 - Device for quality testing of brake linings within the production - Google Patents

Abstract

The present invention relates to a device for quality control of brake linings within the production. The device is intended for use after the pressing process and after the curing process of the brake linings, each lining being to be individually tested. What is new in this case is the particularly robust construction and the arrangement of the displacement measuring unit next to the test piece (5), which records the deformation path of the test piece. Furthermore, the device according to the invention consists, inter alia, of an actuator (2) which generates a test force, a force measuring system (4) which records the generated test force, a test body, a counter-pressure plate (3) and an insertion mask (6) which does not come between the brake pad and the counter-pressure plate , Furthermore, elements for compensating for twisting and unevenness in the brake lining may be integrated in the counter-pressure plate. According to the invention, the device may be integrated as a testing station in the manufacturing process, wherein the feeding takes place manually or automatically, or as a separate testing station.

Description

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The invention relates to a device for quality testing of brake pads within the production with a test cylinder for generating a contact pressure between the friction lining and a counter surface and a force measuring system for recording the applied test force a path measuring system for recording the deformation path of the brake lining of a software for determining the Compressibility of the brake pads as well as trend recognition for automatic counter-steering with systematic deterioration of the quality parameters.

State of the art

So far, brake pads are subjected to a random quality inspection.

A batch of brake pads is generated, from which a random sample is taken and examined in the laboratory. If this sample meets the required quality parameters, the lot is released and put up for sale. If quality defects are found in the random sample, the whole lot is discarded. 01/04/2014 08; 13 2/13

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This type of test causes a high level of rejects as well as uncertainty regarding compliance with the quality criteria of the unchecked parts.

The disadvantage of laboratory test stations is their sensitivity to changing ambient temperatures, vibrations and dust, which is why they are usually operated in their own rooms with a precisely controlled room temperature. Since the insertion process of the specimens in the station is carried out completely manually, and the distance measuring sensor, which records the deformation path of the specimen, usually increased in the vicinity of the force measuring system or attached to the test cylinder. However, this also measures a large part of the bending of the components, which has a negative effect on the quality of the measurement result.

task

Technical object of the invention is to integrate the quality testing of brake pads in the production process and thus to achieve an increase in quality assurance and a reduction in the amount of waste.

This is achieved in that, following the pressing process or the curing process, a test station is arranged, in which each coating is checked for compliance with the required quality parameters. 3/13 01/04/2014 08:13

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As a result, a hundred percent check of the brake pads can be guaranteed and a reduction of the produced rejects can be achieved.

The device can either be integrated directly into the press or as. stand-alone station between the production press and the subsequent curing oven and after the curing oven are arranged.

The test station must be designed so that it is insensitive to the ambient conditions in a brake lining production plant. There are very different temperatures depending on the season, vibrations, electromagnetic force fields, as well as a high level of brake pad dust, which leads to increased friction and material loss in moving parts.

To achieve this, special scrapers from the mining industry are used on the guides and cylinders. These can still ensure safe operation even under increased dust load. All bushings should be made of abrasion-resistant materials such as bronze. The entire construction is built much more massive, to be by the increased weight self-resistant to external vibrations and vibrations. At the same time, this construction method also has a positive effect on the temperature insensitivity. In addition, this will cause the bending of the components during the 0-1 / 04/2014 08:14 4/13

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Test procedure significantly reduced. Also, the number of parts within the force flow is minimized, thereby again reducing the flexure of the test system.

The entire station is built in a compact integral construction, so that it can be more easily integrated into a production process.

In general, all components are selected for their robustness and dust resistance.

The optimal measuring sensor for determining the deformation path works mechanically, determines the path through photoelectric scanning, is insensitive to dust, changing ambient temperatures and electromagnetic influences.

Ideally, the distance measuring sensor is positioned directly next to the test object and centered in the symmetry axis of the test station. At this position, the bending of the components has no influence on the measurement result. However, this positioning can only be selected by means of an appropriately shaped insertion mask and automatic indentation. If this is not possible, then the next best positioning of the measuring sensor is also directly next to the test object, but outside the symmetry axis.

In order to achieve qualitatively comparable results despite dusty ambient conditions, the station may be equipped with a blow-out system in order to 5/13 P.009 / 018 01/04/2014 08:14 No. '; R603 @ 010 @ 010

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Using software, the data obtained can be evaluated in order to influence the production process in case of deviations from the standard parameters in such a way that the quality of the brake linings is optimized.

In order to be able to compare the obtained values of the test station with a central production database, a product identification reader can be integrated, which reads out a unique part number of the brake linings and thus enables an unambiguous assignment.

If necessary, another test module can be placed in the oven after curing to determine a qualitative picture of the effect of curing.

In order to prevent a slowing of the production process due to the test, several test cells can be integrated in one test module.

The loading of test pieces can be carried out either automatically or manually. In each case, the DUTs are entered either by operators or robots in special insertion masks. The test station then fully automatically loads the insert mask into the station, whereby SET PACKAGING ENGINEERING ····· ·· ·· ·

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Insertion mask also at the same time the centering of the test piece takes place under the test tool. After the test, the station pushes the test object out again using the insert mask from the station. With this structure, the entire station is easily automated, and can therefore be made to make without massive conversions in an automated manufacturing process.

To ensure the greatest possible safety, an integration of state-of-the-art safety precautions with manual loading is provided.

The internal control system may offer the possibility of network connection, allowing remote reading of the data obtained. Furthermore, a connection of optical and acoustic signaling devices is possible.

Products identified as defective are automatically eliminated from the further processing after the test.

The determination of the measured values is carried out as far as possible in compliance with the standard ISO 6310: 2001, which ensures comparability with measured values which originate from conventional test methods. If compliance with the standard is not possible for manufacturing reasons, the measurement results remain comparable by using a conversion algorithm. 7/13 P.0117018 01/04/2014 08:15 no .: R603 @ 012 01/04 2014 08:18 FAX +43262663210

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embodiment

The invention will be explained in more detail with reference to an embodiment according to the drawings, Fig.l shows the basic structure for the integration of a test module in the manufacturing process.

2 shows a schematic representation (section) through a test module according to the invention.

FIG. 3 shows a schematic representation (section) of a test module according to the invention with an exemplary embodiment of a charging station.

4 shows a further embodiment variant of the test module according to the invention, in which the displacement measuring system is mounted in the plane of symmetry to the test module.

In Fig.l a possible structure of the production line is shown schematically. A robot or operator removes the specimens from the press after the pressing process and transfers them to a loading station (1), which in turn distributes them to the individual test cells. This guarantees a continuous production process despite individual testing.

In Fig. 3, in the loading station (1), the brake lining is transferred to a fitted insertion mask (6), which supplies the device under test to the testing station. By means of the integrated position measuring system (5), the original material thickness before the application of the 8/13 01/04/2014 08:16

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Determined force. Subsequently, the hydraulic cylinder (2) brings a defined test force and the resulting deformation path is again determined by means of the distance measuring system (5).

The displacement measuring system (5) is designed in such a way that the pure deformation of the test object can be measured directly.

The test station may additionally be equipped with a system for compensating for unevenness of the test items. The specimen is mounted on hydraulic, pneumatic or hydropneumatic compensation cylinders, which allow an optimal alignment of the specimen under the specimen.

The internal control system now checks the received measurement data for compliance with the required quality parameters. If systematic errors are detected by the control system after a few measurements, these can be reduced by targeted countermeasures of the manufacturing process, thus significantly reducing the amount of rejects produced.

FIG. 4 shows a schematic illustration (section) of another embodiment of the test module according to the invention. You can see the guide rods (7) of the system with the special cylinder wipers (8) and the bronze guide bushings (9). In addition, a cardanic suspension (10) between the force measuring system and 01/04/2014 08:16 9/13 No .: R603 P.013 / 018 ®014 01/04 2014 08:19 FAX +43262663210 SET-SOFTWARE ENGINEERING t ·· * «·· ·· _ | · · · · · · · · · · · · · · · · ···

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Test specimen to apply only forces in one axis on the specimen. Also visible is again the insertion mask (6), the force measuring system (4) and the displacement measuring system (5). The displacement measuring system is arranged here as a special feature exactly in the symmetry axis of the device and directly next to the brake pad. It measures directly the deformation path of the brake pad, as it determines the distance between the counter pressure plate (3) and test tool. 10/13 P.014 / 018 01/04/2014 08:17 No .: R603