Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1987-09-10
1989-03-14
Levy, Stewart J.
Measuring and testing
Frictional resistance, coefficient or characteristics
73105, G01N 1902, G01N 1904
Patent
active
048115916
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a device for checking the surface condition of materials.
As part of their final treatment, certain materials must be coated with a layer of another material for protection, for changing their appearance or for subsequent assembly with similar or different materials. The bonding strength of this layer primariliy depends on the surface condition of the materials being coated; however, often the surface condition does not meet the requirements for high quality bonding and special intermediate treatment is necessary.
Although a wide range of mechanical, chemical, heat, electronic and X-ray treatments are available for surfaces, the inspection resources for checking their effectiveness have been until now rather empirical, discontinuous and destructive and they all have required samples of the material.
With this type of inspection equipment, no automatic and continuous control of a surface treatment is possible during its application.
This situation results in signficant scrapping, regardless of how often the controls are performed and the care exercised, and requires frequent interventions by qualified personnel.
A device for controlling the surface condition of materials has already been described in German Pat. No. DE-A-2 535 912, which pertains to a surface roughness indicator, based mainly on the conversion of a well known technique, used for the retransmission of sound signals recorded by means of surface asperities on the bottom of record grooves, to the field of mechanics in order to transform the surface roughness into variations of an electrical signal, which, in this case, are plotted on a cathode ray tube or stored on a recorder.
The indicating device consists of a rigid arm, fitted with a needle and connected to a support via a flexible hinge, which transmits back the amplitude variations on the metal part being controlled to a rigid lever via a control rod. The lever movement activates a commonly used device, such as a solenoid subject to a varying magnetic flux after a change in position of the magnetic core, coupled to the aforementioned lever, or other similar devices. To ensure that the surface roughness is accurately transmitted to the receiver, both the lever and the arm must embody high stiffness and the needle tip must be sufficiently pointed. This means that the use of the device is restricted to hard materials.
The purpose of the present invention is to overcome these drawbacks. As described in these patent claims, this invention solves this difficulty by the creation of a device capable of relative, continuous or discontinuous measurements of the surface condition of the material that are made directly on the material without the need for samples. This is accomplished by means of a device comprising: an adhesion measuring sensor, the sensing element of which is maintained in contact with the surface of the material subject to surface roughness control and which is in relative motion with respect to the surface; and a computer, which performs the comparative measurements and display functions and which can control the surface treatment facility if necessary.
The advantages resulting from this invention consist mainly of the fact that the surface condition is determined sequentially and directly on materials in motion, or by moving the sensor relative to the material, and that the measurement results are used directly for controlling the surface treatment facility.
Details of this invention are presented below and illustrated by drawings showing two possible embodiments of a device for checking a surface treatment facility employing corona conduction on films of plastic material, product at high speed (60-120 meters/s) and submitted herein as an example.
FIG. 1 represents a front view of a two-wheel sensor.
FIG. 2 represents a side view of a two-wheel sensor.
FIG. 3 represents a side view of a flexible strip sensor.
FIGS. 1 and 2 represent an adhesion measuring sensor, the sensing element of which consists of two wheels 1 and 2, mounted on fluid film bearings 3
REFERENCES:
patent: 3017618 (1962-01-01), Cross
patent: 3893330 (1975-07-01), Shute et al.
patent: 3935468 (1976-01-01), Bowen et al.
patent: 4051713 (1977-10-01), Bao et al.
patent: 4098111 (1978-07-01), Hardmark et al.
patent: 4106333 (1978-08-01), Salje et al.
patent: 4662211 (1987-05-01), Strong
Bell Robert P.
Levy Stewart J.
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