METHODS AND PROCESSES FOR CNC TOOL BASED GRATING PROCESSING
Computer numerical control (CNC) machines have dramatically changed manufacturing processes including plasma based cutting. Typically, plasma based cutting executes a single continuous process. However, gratings cut from a grating sheet require a number of discrete cuts be made within a grating sheet to cut each element within the grating sheet to isolate the element required from the grating. Accordingly, embodiments of the invention provide enterprises and facilities employing CNC cutting systems with a means to overcome the limitations of CNC cutting systems when cutting such elements.
1 . A method comprising:
acquiring a plurality of images, each image acquired with a camera of one or more grating sheets upon a computer controlled cutting machine tool (CU-MATCO) where each grating sheet comprises a plurality of grating elements in a predetermined pattern;
processing the plurality of images with a microprocessor to define a plurality of sets of location data, each set of location data defining at least one of a grating element within the one or more grating sheets and a cross-over between a pair of grating elements within the one or more grating sheets;
retrieving from a database a template of a grating to be cut from the one or more grating sheets;
generating with the microprocessor a plurality of cut locations, each cut location representing a location upon a grating element of the plurality of grating elements at which a cut should be made within the grating element of the plurality of grating elements, the plurality of cut locations being established in dependence upon the template and the plurality of sets of location data; and
making each cut of the plurality of cuts with a cutter forming part of the CU-MATCO.
2 . The method according to claim 1 , wherein
making each cut of the plurality of cuts comprises:
moving the cutter to a predetermined position relative to the grating element being cut;
moving the cutter to a first predetermined height relative to the grating element being cut;
moving the cutter in a first direction from the predetermined position to a first edge of the grating element being cut;
upon detecting the first edge of the grating element being cut moving the cutter to a second predetermined height relative to the grating element being cut and waiting for a first predetermined time;
moving the cutter to the predetermined position relative to the grating element being cut;
moving the cutter to the first predetermined height relative to the grating element being cut;
moving the cutter in a second direction from the predetermined position to a second edge of the grating element being cut; and
upon detecting the second edge of the grating element being cut moving the cutter to a third predetermined height relative to the grating element being cut and waiting for a second predetermined time.
3 . The method according to claim 2 , further comprising
upon detecting the first edge of the grating element performing a first predetermined motion relative to the grating element; and
upon detecting the first edge of the grating element performing a second predetermined motion relative to the grating element.
4 . The method according to claim 3 , wherein
the grating element is circular;
the first predetermined motion is a rotation in one direction within a plane perpendicular to the axis of the grating element; and
the second predetermined motion is a rotation in another one direction within the plane perpendicular to the axis of the grating element.
5 . The method according to claim 1 , wherein
the plurality of images are acquired and processed prior to a first cut of the plurality of cuts are made.
6 . The method according to claim 1 , wherein
subsets of the plurality of images are acquired and processed and cut subsets of the plurality of cuts are made.
7 . The method according to claim 2 , wherein
the cutter is a plasma torch; and
detecting an edge of the grating element comprises:
monitoring the arc voltage of the plasma torch; and
determining whether the arc voltage of the plasma torch either varies beyond a predetermined threshold or varies in a predetermined manner.
8 . A method comprising:
acquiring a location of a cut to be made upon a grating element within a grating sheet;
making the cut with a cutter on computer controlled machine tool; wherein
making the cut comprises:
moving the cutter to a predetermined position relative to the grating element being cut;
moving the cutter to a first predetermined height relative to the grating element being cut;
moving the cutter in a first direction from the predetermined position to a first edge of the grating element being cut;
upon detecting the first edge of the grating element being cut moving the cutter to a second predetermined height relative to the grating element being cut and waiting for a first predetermined time;
moving the cutter to the predetermined position relative to the grating element being cut;
moving the cutter to the first predetermined height relative to the grating element being cut;
moving the cutter in a second direction from the predetermined position to a second edge of the grating element being cut; and
upon detecting the second edge of the grating element being cut moving the cutter to a third predetermined height relative to the grating element being cut and waiting for a second predetermined time.
9 . The method according to claim 8 , further comprising
upon detecting the first edge of the grating element performing a first predetermined motion relative to the grating element; and
upon detecting the first edge of the grating element performing a second predetermined motion relative to the grating element.
10 . The method according to claim 9 , wherein
the grating element is circular;
the first predetermined motion is a rotation in one direction within a plane perpendicular to the axis of the grating element; and
the second predetermined motion is a rotation in another one direction within the plane perpendicular to the axis of the grating element.
11 . The method according to claim 9 , wherein
acquiring the location of the cut to be made upon the grating element within the grating sheet comprises:
acquiring a set of initial images of the grating sheet;
processing each initial image of the acquired set of initial images with a plurality of image processing elements to define one or more cross-overs with the initial image of the acquired set of initial images;
generating a plurality of cross-over coordinates, each cross-over coordinate relating to a central point of a crossing between a first element of a plurality of elements and a second element of a plurality of elements where the grating element is one element of the plurality of elements;
processing plurality of cross-over coordinates to define locations of a plurality of elements of which the grating element is one;
processing the locations of the plurality of elements in conjunction with a grating design to define a plurality of cut locations of which the location of the cut is one.
12 . The method according to claim 9 , wherein
acquiring the location of the cut to be made upon the grating element within the grating sheet comprises:
acquiring a set of initial images of the grating sheet;
processing each initial image of the acquired set of initial images with a plurality of image processing elements to one or more elements of a plurality of elements of which the grating element is one;
generating a plurality of element coordinates, each element coordinate relating to a central point of a first element of a plurality of elements where the grating element is one element of the plurality of elements;
processing the plurality of element coordinates to define locations of the plurality of elements of which the grating element is one;
processing the locations of the plurality of elements in conjunction with a grating design to define a plurality of cut locations of which the location of the cut is one.
13 . A method comprising:
acquiring a plurality of images, each image acquired with a camera of one or more grating sheets upon a computer controlled cutting machine tool (CU-MATCO) where each grating sheet comprises a plurality of grating elements in a predetermined pattern;
processing the plurality of images with a microprocessor to define a combined image, the combined image being of a predetermined portion of the grating sheet;
displaying the combined image to a user within a graphical user interface together with a grid template, the grid template comprising a grid having a plurality of vertices representing a virtual grating sheet;
providing the user with the ability to move any vertex of the plurality of vertices to align the grid template with the combined image;
retrieving from a database a template of a grating to be cut from the one or more grating sheets;
generating with the microprocessor a plurality of cut locations, each cut location representing a location upon the one or more grating sheets established in dependence upon the template and the aligned grid template; and
making each cut of the plurality of cuts with a cutter forming part of the CU-MATCO.
14 . The method according to claim 13 , wherein
making each cut of the plurality of cuts comprises:
moving the cutter to a predetermined position relative to the grating element being cut;
moving the cutter to a first predetermined height relative to the grating element being cut;
moving the cutter in a first direction from the predetermined position to a first edge of the grating element being cut;
upon detecting the first edge of the grating element being cut moving the cutter to a second predetermined height relative to the grating element being cut and waiting for a first predetermined time;
moving the cutter to the predetermined position relative to the grating element being cut;
moving the cutter to the first predetermined height relative to the grating element being cut;
moving the cutter in a second direction from the predetermined position to a second edge of the grating element being cut; and
upon detecting the second edge of the grating element being cut moving the cutter to a third predetermined height relative to the grating element being cut and waiting for a second predetermined time.
15 . The method according to claim 14 , further comprising
upon detecting the first edge of the grating element performing a first predetermined motion relative to the grating element; and
upon detecting the first edge of the grating element performing a second predetermined motion relative to the grating element.
16 . The method according to claim 15 , wherein
the grating element is circular;
the first predetermined motion is a rotation in one direction within a plane perpendicular to the axis of the grating element; and
the second predetermined motion is a rotation in another one direction within the plane perpendicular to the axis of the grating element.