Patent Application
20120256623
The subject matter disclosed herein relates to the art of non-destructive testing systems and, more particularly, to a non-contact magnetic particle inspection apparatus.
Conventional manufacturing facilities require various forms of testing to ensure quality of a final product(s). Many manufacturing facilities utilize periodic sampling to ensure final quality. However certain industries require that each part leaving a production facility undergo one or more quality assurance tests. Periodic sampling methods often employ destructive testing techniques to ensure quality. That is, one or more products are selected at random from a production line and subjected to various tests. The tests ultimately result in the destruction of the product(s) but provide data that is used to control an overall product quality. Industries that require that each final product be tested cannot utilize destructive testing techniques. Such industries employ a wide range of non-destructive testing techniques that ensure that each product leaving the facility meets a certain quality standard.
One industry that requires all products be tested is turbomachine manufacturing. Many turbomachine components are subjected to high forces and high temperatures that produce a harsh operating environment. Subjecting a defective part to such a harsh environment could lead to component failure. Failure of a turbomachine component leads to costly down time and expensive repair/replacement. Accordingly, components such as turbomachine buckets are subjected to a number of final tests before leaving production. For example, each turbomachine airfoil made of a ferromagnetic material is subjected to a magnetic particle inspection. In a magnetic particle inspection test, an airfoil is placed in a container and a magnetic field is applied. While the magnetic field is being applied the airfoil is continuously coated with ferrous iron particles. The particles can either be in a dry state or in a wet suspension. The particles are attracted to areas of flux leakage thereby providing a visual indication of a defect. In order to form this visual indication the defect must break lines of flux to form a leakage field. As such, this inspection method is orientation dependent. The test is carried out in multiple steps between which the bucket is manipulated into different orientations. Current testing systems require that the bucket be manually repositioned into each new orientation required for each step of the test and sometimes the induction of current directly into the finish machined part.
According to one aspect of an exemplary embodiment, a non-contact magnetic particle inspection apparatus includes a test article support and manipulation system having a first rail that extends along a first axis, a second rail that extends along the first axis, and a third rail that extends along second axis. The third rail includes a first end that extends to a second end through an intermediate portion. The first end is mounted to the first rail and the second end is mounted to the second rail. A mounting fixture is mounted to the third rail. The mounting fixture includes a test article mounting system and a test article orientation system. The test article orientation system is configured and disposed to selectively manipulate a test article within a magnetic field.
According to another aspect of the exemplary embodiment, a method of manipulating a test article in a magnetic particle test apparatus includes mounting a test article on a mounting fixture arranged on a test article support and manipulation system, activating a test article orientation system coupled to the mounting fixture to establish a desired orientation of the test article relative to a magnetic field generator, and shifting the mounting fixture along the test article support and manipulation system to position the test article in the magnetic field generator.
According to yet another aspect of the exemplary embodiment, a non-contact magnetic particle inspection apparatus includes a test bed having a testing zone, and a magnetic field generator positioned in the testing zone. A test article support and manipulation system is supported in the testing zone. The test article support and manipulation system includes a first rail that extends along a first axis alongside a first side of the magnetic field generator, a second rail that extends along the first axis alongside a second side of the magnetic field generator, and a third rail that extends through the magnetic field generator along a second axis. The third rail includes a first end that extends to a second end through an intermediate portion. The first end is mounted to the first rail and the second end is mounted to the second rail. A mounting fixture is mounted to the third rail. The mounting fixture includes a test article mounting system and a test article orientation system. The test article orientation system is configured and disposed to selectively manipulate a test article within the magnetic field generator.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
With reference to
In further accordance with the exemplary embodiment, magnetic particle inspection apparatus 2 includes a test article support and manipulation system 34 which, as will be discussed more fully below, retains and positions a test article within testing zone 18. Test article support and manipulation system 34 includes first and second rails 38 and 39 that extend along a first axis that is substantially parallel to a magnetic field formed in testing zone 18. First rail 38 includes a first end 41 that extends to a second end 42 through an intermediate portion 43. Similarly, second rail 39 includes a first end 47 that extends to a second end 48 (
Test article support and manipulation system 34 is further shown to include a third rail 70 that extends along a second axis that is substantially orthogonal to the magnetic field produced in testing zone 18. Third rail 70 includes a first end 72 that extends to a second end 73 through an intermediate portion 74 which passes through testing zone 18. First end 72 is mounted to first carriage 51 and second end 73 is mounted to second carriage 52. With this agreement, third rail 70 is selectively positionable along the first axis relative to first and second rails 38 and 39. Third rail 70 is also shown to include a third carriage 79 that is selectively positionable along the second axis between first and second ends 72 and 73 along intermediate portion 74. As will be discussed more fully below, third carriage 79 supports a mounting fixture 90.
Mounting fixture 90 includes a test article mounting system 93 and a test article orientation system 95. Test article mounting system 93 includes a support surface 103 having a plurality of slots 106-109. A first mounting element 110 is positioned in slot 106 and a second mounting element 111 is positioned in slot 108. First and second mounting elements 110 and 111 are selectively positioned upon support surface 103 along slots 106 and 108 to retain a test article 114. In the exemplary embodiment shown, test article 114 takes the form of a turbomachine bucket 115.
In further accordance with the exemplary embodiment, test article orientation system 95 includes a first positioning member 117 and a second positioning member 119. First positioning member 117 is configured to rotate test article 114 about the first or second axis. While second positioning member 119 is configured to rotate test article mounting system 93 about a third axis that is substantially perpendicular to the first and second axes. With this arrangement, test article 14 can be arranged in testing zone 18 in a first configuration, such as shown in
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
