CN-119644579-B - 3D printing method for reducing dynamic focusing load

Abstract

The invention relates to a 3D printing method for reducing dynamic focusing load, which belongs to the field of 3D printing and comprises the following steps of S1, setting a focusing field lens between a scanning galvanometer group and a printing working surface, S2, establishing a coordinate system by taking the position of incident laser vertically entering the printing working surface as a coordinate origin, S3, calculating deflection angles of an X-axis galvanometer and a Y-axis galvanometer based on the printing position and compensating quantity of a dynamic focusing lens group, S4, adjusting the X-axis galvanometer and the Y-axis galvanometer based on a calculation result, and adjusting focal length by using the dynamic focusing lens group to finish printing data on a corresponding coordinate point. The 3D printing method reduces the work load of the dynamic focusing motor, improves the printing quality of edge printing data, and effectively reduces the error of spot position shake at the printing working surface caused by motor positioning shake, thereby improving the stability of image printing.

Inventors

• LI BINGTAO
• LI MINGZHI
• TANG HUI
• LI YONG

Assignees

• 爱司凯科技股份有限公司

Dates

Publication Date

20260505

Application Date

20241225

Claims (3)

1. 1. The 3D printing method for reducing dynamic focusing load is a printing method of a front focusing galvanometer system, wherein the front focusing galvanometer system comprises a dynamic focusing lens group, a scanning galvanometer group and a printing working surface which are sequentially arranged according to a light path of incident laser, and the scanning galvanometer group comprises an X-axis galvanometer and a Y-axis galvanometer and is characterized by comprising the following steps: s1, setting a focusing field lens between a scanning galvanometer group and a printing working surface, wherein the focusing field lens is parallel to the printing working surface; s2, establishing a coordinate system by taking the position of the incident laser vertically entering the printing working surface as a coordinate origin; S3, calculating deflection angles of the X-axis vibrating mirror and the Y-axis vibrating mirror based on the printing position and compensating the dynamic focusing lens group, wherein the deflection angles of the X-axis vibrating mirror and the Y-axis vibrating mirror meet the following formula: (1), (2), Wherein (X, Y) represents the coordinate of the printing position, dx represents the distance between the X-axis vibrating mirror and the optical center of the focusing field lens, dy represents the distance between the Y-axis vibrating mirror and the optical center of the focusing field lens, thetax and thetay respectively represent the deflection angles of the light beams reflected by the X-axis vibrating mirror and the Y-axis vibrating mirror, L represents the vertical distance between the optical center of the scanning vibrating mirror group and the printing working surface, and ax and ay respectively represent the deflection angles of the light beams in the X-axis and Y-axis directions after refraction by the focusing field lens; The ax and ay are calculated by the following formula: (3), (4); the compensation amount of the dynamic focusing lens group is calculated by the following formula: (5), Wherein DeltaL represents the compensation amount of the dynamic focusing lens group, rx and Ry respectively represent the curvature radius of an image field of a curved surface where a beam focusing point of a laser beam is located in the X-axis direction and the Y-axis direction; the Rx and Ry are calculated by the following formula: (6), (7); S4, adjusting the X-axis galvanometer and the Y-axis galvanometer based on the calculation result, and adjusting the focal length by using the dynamic focusing lens group to finish printing of the printing data on the corresponding coordinate points.
2. 2. The 3D printing method for reducing dynamic focusing load according to claim 1, wherein S3 is characterized in that based on the calculated data of a plurality of groups of X-axis vibrating mirror deflection angles, Y-axis vibrating mirror deflection angles and dynamic focusing lens group compensation amounts, a functional relation between the dynamic focusing lens group compensation amounts and the X-axis vibrating mirrors and the Y-axis vibrating mirror deflection angles is obtained in a numerical simulation mode, and a corresponding relation data table is established; And S4, calling data in a relational data table based on coordinate points of the printing data, and acquiring the deflection angle of the X-axis vibrating mirror, the deflection angle of the Y-axis vibrating mirror and the compensation quantity of the dynamic focusing lens group.
3. 3. The method for 3D printing with reduced dynamic focus load according to claim 1, wherein S4 adjusts deflection angles of the X-axis galvanometer and the Y-axis galvanometer through a rotating motor, and the dynamic focus lens group is driven through a voice coil motor.

Description

3D printing method for reducing dynamic focusing load Technical Field The invention belongs to the technical field of 3D printing, and particularly relates to a 3D printing method for reducing dynamic focusing load. Background The galvanometer scanning processing is widely applied to various industries such as laser drilling, cutting, welding, 3D printing and the like, and the principle is that the galvanometer is adopted to reflect laser beams, and image scanning printing is carried out on a printing working surface. According to the mode of scanning the light path by the galvanometer, the current laser scanning focusing mode comprises a front focusing galvanometer and a rear focusing galvanometer, wherein the rear focusing galvanometer focuses after scanning, and the front focusing galvanometer focuses before scanning. In the front focusing galvanometer mode, laser beams firstly pass through a collimating lens and a beam expander, then pass through a dynamic focusing lens capable of moving in real time, and then reflect laser beams through the galvanometer, so that scanning and printing work of the laser beams on a printing working surface is realized. The mechanism needs to use a program compensation algorithm to control the focusing lens in real time and coordinate with the position compensation focal length of the galvanometer scanning so that the laser beam can be imaged on the printing working surface in real time. The front focusing scheme uses the voice coil motor which is dynamically adjusted in real time to drive the focusing lens to focus the light path system, compared with the rear focusing scheme, the scheme can eliminate the influence of the price and the volume of the F-Theta flat field lens, the 3D printing mainly comprising the galvanometer scanning is developed along with the maturity of the industry, the galvanometer printing module develops towards the directions of small volume, multiple laser heads and high integration level, and the front focusing galvanometer system has the advantages. But the current duty ratio in the 3D printing industry is very low, the main reason is that the dynamic focusing scheme needs to carry out position compensation at all times when the voice coil motor drives the lens, and is estimated according to the actual working requirement, the dynamic focusing equipment needs to carry out back and forth motion to compensate the focal length of the lens within the working period of one year, more than 100 hundred million times, so the stability requirement on the voice coil motor and the linear guide rail is very high, the working load of the dynamic focusing motor is too large, and the continuous working is easy to break for a long time, so the front focusing galvanometer system is limited by most manufacturers, the actual performance of products in the industry at present, and the front focusing dynamic focusing scheme is poorer in stability than the rear focusing flat field lens scheme. In addition, the front focusing system is limited by the principle of an optical system, and when scanning a printing pattern, the beam vertically scans the center position of the pattern and the beam obliquely scans the edge position of the pattern, and the spot deformation amount of the front focusing system is close to twice that of the rear focusing system, so that the quality of part edge printing is poorer. Finally, when the mirror motor shakes at the angle of the reflecting mirror, small-angle shake can occur as a servo system, and the excessive error of the spot position shake at the printing working surface can be caused, so that the printing stability is affected. Disclosure of Invention The invention aims to provide a 3D printing method for reducing dynamic focusing load, which aims to solve the problems that the working load of a dynamic focusing motor of the existing focusing galvanometer system is large, continuous operation is easy to fail for a long time, the quality of part edge printing is worse, and the printing stability is influenced due to overlarge shaking when the galvanometer angle is adjusted. In order to achieve the above object, the technical scheme of the present invention is as follows: the invention relates to a 3D printing method for reducing dynamic focusing load, which is a printing method of a front focusing galvanometer system, wherein the front focusing galvanometer system comprises a dynamic focusing lens group, a scanning galvanometer group and a printing working surface which are sequentially arranged according to the light path of incident laser, and the scanning galvanometer group comprises an X-axis galvanometer and a Y-axis galvanometer, and comprises the following steps: s1, setting a focusing field lens between a scanning galvanometer group and a printing working surface, wherein the focusing field lens is parallel to the printing working surface; s2, establishing a coordinate system by taking the position of the incident laser vert