CN101514891B

CN101514891B - Method for detecting optical photograph of large mold casting blank

Info

Publication number: CN101514891B
Application number: CN200910066660.9A
Authority: CN
Inventors: 单堃; 李悦; 姚胜; 谢韬
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp; Faw Tooling Die Manufacturing Co Ltd
Priority date: 2009-03-20
Filing date: 2009-03-20
Publication date: 2014-01-15
Anticipated expiration: 2029-03-20
Also published as: CN101514891A

Abstract

The invention relates to a method for detecting an optical photograph of a large mold casting blank. The method is characterized in that a lug boss and a peripheral unfinished surface formed by a workpiece are subjected to bulge application; all processing molding surfaces are subjected to data acquisition; a system is established for acquired 3D points, and is compared with the prior theory three-dimensional design data; finally, a digital control processing alignment standard report is released. Under a report chart environment, each direction required in digital control processing is standardized, generally, display of the standard is required to be determined by trial cutting on a machine tool, and theoretical coordinate values, offset directions and dimensions of the coordinates are displayed to be used for digital control processing alignment and standard determination. The method accurately determines the digital control processing standard, reduces load of the machine tool and time for aligning the center by digital control equipment, and accelerates cycle of cast output. A digital control programming staff can reasonably program a digital control processing program through allowance deviation data, thereby improving effective operation time of the digital control machine tool, reducing consumption of cost, improving working efficiency of digital control processing while ensuring the quality of digital control processing, and accelerating the output cycle of cast blank.

Description

The optical photo detection method of large mold spray

Technical field

The present invention relates to a kind of optical photo detection method of large mold spray, is by using optical detection apparatus to detect the surplus of large mold spray.

Technical background

Along with the quality raising of mould product and the quickening of manufacturing schedule, Mechanical processing of casting quality and output cycle have been had to higher requirement, but foundry goods is in the past directly to go up numerically-controlled machine, by numerically-controlled machine centering center, determine digital control processing standard, the time of this process need is longer.After centering, by lathe, try the process redundancy of the formal check foundry goods of cutter, supervision time for large-scale workpiece is very long, be easy to occur omitting simultaneously, if occurring boss while interfering profile and casting can not find in time when digital control processing, add to there will be man-hour and hit cutter, there is the phenomenons such as tool wear, workpiece are scrapped, process equipment precise decreasing, when affecting the workpiece output cycle, strengthened the expenditure of cost.

Summary of the invention

The object of the invention is to provide a kind of optical photo detection method of large mold spray, gathers the 3D coordinate of object discrete point, and compare analysis in CAD digital-to-analogue by point of application photogrammetry system, calculates the process redundancy of foundry goods; It has accelerated the efficiency of digital control processing, can accurately determine digital control processing standard, reduce the numerical control device centering time that takies, the data of digital control processing surplus and interference profile are provided, avoid the tool wear causing because surplus is excessive and the generation of hitting cutter situation, guaranteed the quality safety of workpiece and the precision of equipment; By use, put photogrammetry system by all processing profile of foundry goods with the whole collection of the form of discrete point out, use the benchmark identical with digital control processing to create coordinate system, and with cad data comparison, and workpiece is carried out to coordinate system skew, by after all processing profile surpluses translation of foundry goods evenly.

Technical scheme of the present invention is achieved in that the optical photo detection method of large mold spray, it is characterized in that: concrete steps are pasted the surface location of the boss forming in the processing profile of workpiece, interference surface, casting process and the i.e. all concerns of peripheral non-machined surface a little for (1); (2) all processing profiles of spray are carried out to data acquisition; The final data deviation that guarantees collection point is less than 0.5 pixel, and engineer's scale deviation is less than 0.15mm, is enough to upper result, to data Resurvey as discontented; (3) to the 3D point gathering build be and with existing theory three-dimensional design data comparison;

First whether specified data collection is complete does not omit, determine digital control processing centering benchmark, cad data is input under alignment environment with center of die coordinate system, guarantee with the principle of benchmark, the general system, method of building of image data employing detection to be carried out to 3-2-1 establishment coordinate system with digital control processing, require foundry goods bottom surface flatness to be less than 0.3mm, Y-direction is along pressing direction; After determining that 3D point aligns with cad data, compare with cad data, according to the surplus deviation of data point, coordinate system is carried out to translation, when guaranteeing to meet digital control processing minimum margin, make the process redundancy of workpiece even, General Requirements guarantees between 5-15mm as far as possible, if there is process redundancy deficiency or process redundancy is bigger than normal should extract deviate, simultaneously to interfering the data of profile to carry out special marking, in order to avoid there is hitting cutter; (4) go out the report of digital control processing centering benchmark; Under report chart environment, by the required all directions benchmark of digital control processing, conventionally need on lathe, carry out trial cut and cut to confirm to show, and show theoretical coordinate value and coordinate offset direction and size, during for digital control processing centering and definite benchmark, use.

Good effect of the present invention is to have determined accurately digital control processing standard, has reduced lathe load, numerical control device is looked for the RC time, has accelerated the cycle of foundry goods output.Numerical control programming personnel can reasonably work out out nc program by surplus deviation data, improved the effective running time of numerically-controlled machine, reduce the consumption of cost, when guaranteeing Processing Quality of NC Machining, improved the work efficiency of digital control processing, the output cycle of having accelerated spray.

Accompanying drawing explanation:

Fig. 1 is the entity schematic diagram of embodiments of the invention 1 foundry goods;

Fig. 2 is embodiments of the invention

the entity schematic diagram of foundry goods;

Fig. 3 is embodiments of the invention the entity schematic diagram of foundry goods;

Embodiment:

Below in conjunction with embodiment, the present invention will be further described:

Embodiment 1:

As shown in Figure 1, before work, the entity of foundry goods 1 to be opened to the shape of abundant confirmation entity, size, machining area, non-machining area and dependency structure position.Then the boss forming in the processing profile of workpiece, interference surface, casting process and peripheral non-machined surface are pasted a little to 2; The processing profile that spray is all is carried out to data acquisition; The final data deviation that guarantees collection point is less than 0.5 pixel, and engineer's scale deviation is less than 0.15mm, and this foundry goods approximately pastes a little 1000 left and right.After pasting point 2, to check whole foundry goods, and search the place that whether has omission, be supplemented.

Embodiment 2

As shown in Figure 2, before work, the entity of foundry goods 1 to be opened to the shape of abundant confirmation entity, size, machining area, non-machining area and dependency structure position.Then the boss forming in the processing profile of workpiece, interference surface, casting process and peripheral non-machined surface are pasted a little to 2; The processing profile that spray is all is carried out to data acquisition; The final data deviation that guarantees collection point is less than 0.5 pixel, and engineer's scale deviation is less than 0.15mm, and this foundry goods approximately pastes a little 1000 left and right.After pasting point 2, to check whole foundry goods, and search the place that whether has omission, be supplemented.

Embodiment 3

As shown in Figure 3, before work, the entity of foundry goods 1 to be opened to the shape of abundant confirmation entity, size, machining area, non-machining area and dependency structure position.Then the boss forming in the processing profile of workpiece, interference surface, casting process and peripheral non-machined surface are pasted a little to 2; The processing profile that spray is all is carried out to data acquisition; The final data deviation that guarantees collection point is less than 0.5 pixel, and engineer's scale deviation is less than 0.15mm, and this foundry goods approximately pastes a little 1000 left and right.After pasting point 2, to check whole foundry goods, and search the place that whether has omission, be supplemented.

Determine digital control processing centering benchmark, cad data is input under alignment environment with center of die coordinate system, guarantee that with the principle of benchmark, image data being carried out to 3-2-1 with digital control processing creates coordinate system, require foundry goods bottom surface flatness to be less than 0.3mm, Y-direction is along pressing direction; After determining that 3D point aligns with cad data, compare with cad data, according to the surplus deviation of data point, coordinate system is carried out to translation, when guaranteeing to meet digital control processing minimum margin, make the process redundancy of workpiece even, if existed, process redundancy deficiency or process redundancy are bigger than normal should extract deviate, simultaneously to interfering the data of profile to carry out special marking, in order to avoid there is hitting cutter; (4) go out the report of digital control processing centering benchmark

Under report chart environment, all directions benchmark that digital control processing is required shows, and shows theoretical coordinate value and coordinate offset direction and size, during for digital control processing centering and definite benchmark, uses.

Claims

1. the optical photo detection method of large mold spray, is characterized in that: concrete steps are pasted the surface location of the boss forming in the processing profile of workpiece, interference surface, casting process and the i.e. all concerns of peripheral non-machined surface a little for (1); (2) all processing profiles of spray are carried out to data acquisition; The final data deviation that guarantees collection point is less than 0.5 pixel, and engineer's scale deviation is less than 0.15mm, is enough to upper result, to data Resurvey as discontented; (3) to the 3D point gathering build be and with existing theory three-dimensional design data comparison; First whether specified data collection is complete does not omit, determine digital control processing centering benchmark, cad data is input under alignment environment with center of die coordinate system, guarantee with the principle of benchmark, the general system, method of building of image data employing detection to be carried out to 3-2-1 establishment coordinate system with digital control processing, require foundry goods bottom surface flatness to be less than 0.3mm, Y-direction is along pressing direction; After determining that 3D point aligns with cad data, compare with cad data, according to the surplus deviation of data point, coordinate system is carried out to translation, when guaranteeing to meet digital control processing minimum margin, make the process redundancy of workpiece even, guarantee as far as possible between 5-15mm, if there is process redundancy deficiency or process redundancy is bigger than normal should extract deviate, simultaneously to interfering the data of profile to carry out special marking, in order to avoid there is hitting cutter; (4) go out the report of digital control processing centering benchmark; Under report chart environment, all directions benchmark that digital control processing is required shows, and shows theoretical coordinate value and coordinate offset direction and size, during for digital control processing centering and definite benchmark, uses.