CN-122023510-A - Projection positioning method

Abstract

The application discloses a projection positioning method, and belongs to the technical field of product manufacturing. The method comprises the steps of determining a characteristic contour line of a workpiece, determining a reference contour line based on the characteristic contour line, forming an actual contour line on the workpiece based on the reference contour line, taking the reference contour line as a verification layer of a layering projection program, and projecting a light shadow of the reference contour line on the workpiece based on the verification layer of the layering projection program. The application can improve the precision and efficiency of the positioning of the layering, reduce the difficulty and cost of manual operation, is applicable to composite material products with various shapes and sizes, and has stronger universality and flexibility.

Inventors

• SU ZHENYU
• LEI PINI
• YUAN ZHONGYI
• LI YOU

Assignees

• 上海航空发动机复合材料有限责任公司

Dates

Publication Date

20260512

Application Date

20250930

Claims (14)

1. 1. The projection positioning method is characterized by comprising the following steps of: Determining a characteristic contour line of the workpiece; determining a reference contour line based on the feature contour line; forming an actual contour line on the workpiece based on the reference contour line, and taking the reference contour line as a verification layer of a layering projection procedure; and projecting a light shadow of the reference contour line on the workpiece based on the verification layer of the layering projection program.
2. 2. The projection positioning method according to claim 1, wherein, In the step of determining the reference contour line, The reference contour line is an equidistant amplified contour line obtained after equidistant amplification of the characteristic contour line of the product.
3. 3. The projection positioning method according to claim 2, wherein, The spacing between the equidistant magnification contour lines and the feature contour lines is less than or equal to 300mm.
4. 4. The projection positioning method according to claim 1, wherein, In the step of determining the reference contour line, The reference contour line is a typical characteristic contour line formed by connecting key characteristic line segments extracted outside a characteristic contour line area of the product.
5. 5. The projection positioning method of claim 4, wherein, The typical feature profile is less than or equal to 300mm from the feature profile.
6. 6. The projection positioning method according to claim 1, wherein, The step of forming the actual contour line on the workpiece includes: the positional accuracy of the actual contour line on the workpiece is measured to ensure that the position of the actual contour line coincides with the position of the reference contour line.
7. 7. The projection positioning method of claim 6, wherein, The position accuracy of the actual contour line on the workpiece is controlled within +/-0.15 mm; the actual contour line has a width ranging from 0.3 to 0.5mm and a depth ranging from 0.3 to 0.5mm.
8. 8. The projection positioning method according to claim 1, wherein a light shadow of the reference contour line is projected on the workpiece, after which, And after verifying that the projection procedure of the paving layer is correct, carrying out projection of at least one paving layer.
9. 9. The projection positioning method of claim 8, wherein, A step of confirming the coincidence of the shadow of the reference contour line and the actual contour line, comprising: calculating the deviation between the shadow of the reference contour line and the actual contour line; If the deviation is within the preset range, judging that the layering projection program is accurate; If the deviation exceeds the preset range, the layering projection procedure is adjusted, the step of taking the reference contour line as a verification layer of the layering projection procedure is returned, and the steps are repeated until the light shadow of the reference contour line and the actual contour line coincide.
10. 10. Projection positioning method according to claim 8 or 9, characterized in that, After the projection of the N layers, returning to the step of taking the reference contour line as a verification layer of the layer projection program, and repeating the steps until the light shadow of the reference contour line is overlapped with the actual contour line, wherein N is more than or equal to 5.
11. 11. The projection positioning method according to claim 1, wherein, A step of determining a characteristic contour line of a workpiece, comprising: scanning the workpiece by using a measuring device to acquire surface data of the workpiece; based on the surface data, a feature contour is generated.
12. 12. The projection positioning method according to claim 1, wherein, A step of forming an actual contour line on a workpiece, comprising: The actual contour is formed on the workpiece according to the reference contour using a cutting device or a machining device.
13. 13. The projection positioning method according to claim 1, wherein, Before the step of taking the reference contour line as a verification layer of the layup projection procedure, the method comprises the steps of: the layup projector is generated by the projector generation software.
14. 14. The projection positioning method according to claim 1, wherein, A step of projecting a shadow of a reference contour on a workpiece, comprising: a laser projection device is used for acquiring the light shadow of the reference contour line.

Description

Projection positioning method Technical Field The application relates to the technical field of product manufacturing, in particular to a projection positioning method. Background In modern manufacturing processes, layup projection techniques are widely used in the manufacture of various products, such as composite materials in the aerospace, automotive, and other fields. However, existing layup projection techniques may cause the layup position to deviate from the intended due to errors in the projection procedure or inaccuracy in the tooling profile during application, thereby affecting the quality and performance of the product. Therefore, how to ensure the accuracy of the layering projection procedure is a technical problem to be solved currently. Disclosure of Invention The embodiment of the application provides a projection positioning method, which comprises the steps of determining a characteristic contour line of a workpiece, determining a reference contour line based on the characteristic contour line, forming an actual contour line on an actual workpiece, and taking the reference contour line as a verification layer of a layering projection program, so that a light shadow of the reference contour line is projected on the workpiece, and accurate positioning and verification are realized. The projection positioning method comprises the following steps: Determining a characteristic contour line of the workpiece; determining a reference contour line based on the feature contour line; forming an actual contour line on the workpiece based on the reference contour line, and taking the reference contour line as a verification layer of a layering projection procedure; and projecting a light shadow of the reference contour line on the workpiece based on the verification layer of the layering projection program. In some embodiments, in the step of determining the reference contour, The reference contour line is an equidistant amplified contour line obtained after equidistant amplification of the characteristic contour line of the product. In some embodiments, the spacing between the equidistant magnification profile and the feature profile is less than or equal to 300mm. In some embodiments, in the step of determining the reference contour, The reference contour line is a typical characteristic contour line formed by connecting key characteristic line segments extracted outside a characteristic contour line area of the product. In some embodiments, the typical feature profile is less than or equal to 300mm from the feature profile. In some embodiments, the step of forming the actual contour on the workpiece includes: the positional accuracy of the actual contour line on the workpiece is measured to ensure that the position of the actual contour line coincides with the position of the reference contour line. In some embodiments, the position accuracy of the actual contour line on the workpiece is controlled within + -0.15 mm; the actual contour line has a width ranging from 0.3 to 0.5mm and a depth ranging from 0.3 to 0.5mm. In some embodiments, a shadow of the reference contour is projected onto the workpiece, after which, And after verifying that the projection procedure of the paving layer is correct, carrying out projection of at least one paving layer. In some embodiments, the step of determining the overlap of the shadow of the reference contour and the actual contour comprises: calculating the deviation between the shadow of the reference contour line and the actual contour line; If the deviation is within the preset range, judging that the layering projection program is accurate; If the deviation exceeds the preset range, the layering projection procedure is adjusted, the step of taking the reference contour line as a verification layer of the layering projection procedure is returned, and the steps are repeated until the light shadow of the reference contour line and the actual contour line coincide. In some embodiments, after the projection of N plies, the process returns to the step of taking the reference contour as a check layer for the ply projection program and repeats the above steps until the light shadow of the reference contour coincides with the actual contour, where N+.5. In some embodiments, the step of determining a feature profile of the workpiece comprises: scanning the workpiece by using a measuring device to acquire surface data of the workpiece; based on the surface data, a feature contour is generated. In some embodiments, the step of forming an actual contour on the workpiece includes: The actual contour is formed on the workpiece according to the reference contour using a cutting device or a machining device. In some embodiments, the step of taking the reference contour as a verification layer of the layup projection procedure includes: the layup projector is generated by the projector generation software. In some embodiments, projecting the light shadow of the reference contou