Light path transmission and printing method for forging printing

Abstract

The invention belongs to the technical field of 3D metal powder forging printing, and provides a light path transmission and printing method for forging printing, and the light path transmission method for forging printing comprises the steps: S1, continuous laser is transmitted to a dichroscope through an optical fiber, and pulse laser is transmitted to the dichroscope through two reflectors; according to the light path transmission method, double-laser coupling of continuous laser and pulse laser is achieved through the dichroscope, double-light coupling of the continuous laser and the pulse laser is achieved through the dichroscope, loss of light energy is reduced to the maximum extent, switching of the continuous laser and the pulse laser is achieved through the light beam selector device, and the light path transmission efficiency is improved. The problem that in an existing method, the geometric center and the breadth center of double galvanometers do not coincide is solved, the cost for achieving the forging and printing technology is reduced, the heat dissipation efficiency of the galvanometers is improved, the working reliability of the galvanometers is enhanced, only one galvanometer is needed in the method, and the use cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D metal powder forging printing, and in particular relates to an optical path transmission and printing method for forging printing. Background Art

[0002] Forging printing technology combines 3D printing with forging techniques, efficiently and accurately producing parts with complex shapes and high mechanical properties. It's suitable for a variety of materials and reduces material waste and processing steps. Forging printing uses computer software to create a three-dimensional model of a part. A continuous laser beam is first used to melt metal powder according to the part's contour parameters. After solidification, the finished part is forged using a pulsed laser. This plastic deformation causes the metal's grains to rearrange and refine, thereby improving the material's density and mechanical properties.

[0003] In the process of realizing forging printing technology, two lasers need to be used in conjunction, so forging printing equipment often has two problems. First, most of the current forging printing equipment uses a continuous laser to melt metal powder to form a print, then turns off the continuous laser and turns on the pulsed laser to repeatedly scan the current layer for forging processing, and repeats this process to achieve forging printing processing of the print. This method will greatly reduce the laser life due to the continuous switching of the laser, which increases the maintenance cost of the laser in the later stage; and the pulsed laser and the continuous laser need to run for a period of time after being turned on to stabilize, so the above processing method will affect the density and mechanical properties of the print; secondly, the forging printing equipment usually requires two galvanometers and two field mirrors. When the galvanometers are fixed, if the geometric center points of the two galvanometers do not coincide with the center point of the printing format, the various performances of the printed part will be greatly affected;

[0004] The current method is to customize a fixing base for the two galvanometer mirrors to make the geometric center coincide with the format center in the horizontal plane. Although this method can solve the problem of center coincidence, it will cause certain errors due to the processing reasons of the galvanometer mirror fixing base and manual adjustment factors. In addition, the two galvanometer mirrors and the field mirror occupy most of the position of the optical platform of the equipment, which limits the size of the forging printing format and increases the production and maintenance costs of the equipment to a certain extent. In order to effectively solve the above two problems, a light path transmission and printing method for forging printing is needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide an optical path transmission and printing method for forging printing, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a light path transmission method for forging printing, comprising the following steps:

[0007] S1, continuous laser is transmitted to the dichroic mirror through optical fiber, and pulsed laser is transmitted to the dichroic mirror through two mirrors;

[0008] S2, a dichroic mirror transmits the composite light composed of continuous laser and pulsed laser to the beam selector;

[0009] S3, the upper computer software controls the rotation of the beam selector, and the rotating beam selector realizes the switching between continuous laser and pulsed laser;

[0010] S4, continuous laser or pulse laser is transmitted to the galvanometer through the beam selector and the beam expander;

[0011] S5. The continuous laser or pulsed laser transmitted to the galvanometer is transmitted to the printing surface through the field lens;

[0012] S6. Transmit to the printing format continuous laser or pulse laser to scan and process the metal powder.

[0013] According to a further technical solution, in "step S1", the wavelengths of the continuous laser and the pulsed laser are different.

[0014] According to a further technical solution, in "step S1", the two reflectors are arranged in parallel.

[0015] By changing the processing methods of continuous laser and pulsed laser and the transmission optical path of pulsed laser, the problems of short laser life, unstable print density and mechanical properties, and wide printing processing area can be solved.

[0016] A printing method for forging printing, applied to any of the above-mentioned optical path transmission methods for forging printing, comprises the following steps:

[0017] S1, control the beam selector to rotate and switch to continuous laser;

[0018] S2, continuous laser scans the area within unit time through the galvanometer;

[0019] S3. After the galvanometer completes the first scan, the beam selector rotates and switches to the pulse laser;

[0020] S4, the pulse laser repeatedly scans the above-mentioned area through the galvanometer within a unit time;

[0021] S5. Repeat the above process until the current layer is scanned and processed, and then start re-powdering to scan and process the next layer;

[0022] S6. After all layers are scanned and processed, the forging printing process of the printed part is completed.

[0023] According to a further technical solution, in "step S4", the scanning duration is the same as the first duration.

[0024] As a further technical solution, in "steps S2 and S4", the duration of the scanning process can be set by the host computer software.

[0025] The upper computer software controls the rotation of the beam selector to achieve dual laser following processing.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention and the optical transmission method utilize a dichroic mirror to achieve dual-laser coupling of a continuous laser and a pulsed laser. The dichroic mirror not only achieves dual-light coupling of the continuous laser and the pulsed laser, but also minimizes light energy loss. A beam selector device is used to achieve switching between the continuous laser and the pulsed laser, thereby avoiding the problem of misalignment between the geometric centers of the dual galvanometer mirrors and the format center in the existing method, reducing the cost of implementing the forging printing technology, improving the heat dissipation efficiency of the galvanometer mirror, and enhancing the working reliability of the galvanometer mirror. In addition, the method requires only one galvanometer mirror, reducing the cost of use.

[0028] The present invention and the printing method utilize upper computer software in conjunction with a beam selector to realize dual laser follow-up processing of continuous laser and pulsed laser. The method sets a shorter scanning time to accelerate the printed part to enter the plastic state, improve the work efficiency of forging printing processing, and realize a dual laser follow-up processing method based on forging printing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the transmission light path of the forged printing of the present invention;

[0030] Figure 2 This is a schematic flow chart of the printing method of the present invention;

[0031] Figure 3 Schematic diagram of the structure of the beam selector of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the embodiments.

[0033] The following examples are intended to illustrate the present invention but are not intended to limit the scope of protection of the present invention. The conditions in the examples may be further adjusted according to specific conditions. Simple improvements to the method of the present invention within the scope of the present invention are also within the scope of protection claimed in the present invention.

[0034] See also Figure 1-3 The present invention provides an optical path transmission method for forging printing, comprising the following steps:

[0035] S1. Continuous laser light is transmitted to a dichroic mirror through an optical fiber, and pulsed laser light is transmitted to a dichroic mirror through two reflectors. The wavelengths of the continuous laser light and the pulsed laser light are different, and the two reflectors are arranged in parallel.

[0036] S2, a dichroic mirror transmits the composite light composed of continuous laser and pulsed laser to the beam selector;

[0037] S3, the upper computer software controls the rotation of the beam selector, and the rotating beam selector realizes the switching between continuous laser and pulsed laser;

[0038] S4, continuous laser or pulse laser is transmitted to the galvanometer through the beam selector and the beam expander;

[0039] S5. The continuous laser or pulsed laser transmitted to the galvanometer is transmitted to the printing surface through the field lens;

[0040] S6. Transmit to the printing format continuous laser or pulse laser to scan and process the metal powder.

[0041] In this embodiment, a beam selector is provided. When the composite light is transmitted to the beam selector, it passes through the absorption filter on the selector to filter the laser light required at the moment. A total of four absorption filters are installed on the beam selector. Two of them are absorption filters 1 that only pass continuous laser light, and the remaining one is absorption filter 2 that only passes pulsed laser light. The beam selector is controlled by a host computer.

[0042] The optical system uses a beam selector to switch between continuous and pulsed lasers. This not only avoids the problem of frequent switching of the laser, which shortens the laser life, but also provides more stable continuous and pulsed lasers, thereby further improving the density and mechanical properties of printed parts.

[0043] The optical path system couples continuous laser and pulsed laser through a dichroic mirror and uses a beam selector to separate continuous laser and pulsed laser, so that the forging printing equipment only needs one set of galvanometer and field mirror, avoiding the problem of misalignment between the geometric center of the dual galvanometer and the center of the format, reducing the cost of implementing forging printing technology, improving the heat dissipation efficiency of the galvanometer, and enhancing the working reliability of the galvanometer.

[0044] A printing method for forging printing, applied to the optical path transmission method for forging printing described in the above embodiment, comprises the following steps: S1, controlling a beam selector to rotate and switch to continuous laser;

[0045] S2, continuous laser scans the area within unit time through the galvanometer;

[0046] S3. After the galvanometer completes the first scan, the beam selector rotates and switches to the pulse laser;

[0047] S4, the pulse laser repeatedly scans the above area through the galvanometer within a unit time. The scanning time is the same as the first time. The scanning time can be set by the host computer software.

[0048] S5. Repeat the above process until the current layer is scanned and processed, and then start re-powdering to scan and process the next layer;

[0049] S6. After all layers are scanned and processed, the forging printing process of the printed part is completed.

[0050] In this embodiment, the advantage of this printing method is that the scanning time can be set manually, that is, a continuous laser can be used to complete the scanning processing of the current layer, and then a pulse laser scan can be performed. A shorter scanning time can also be set to achieve dual laser continuous follow-up processing in a short period of time. The shorter scanning time allows the pulse laser to perform forging processing when the solid metal is still at a high temperature, shortening the time it takes for the printed part to enter the plastic state, and improving the work efficiency of the forging printing process.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A light path transmission method for forging printing, characterized in that: The following steps are involved: S1, continuous laser is transmitted to the dichroic mirror through optical fiber, and pulsed laser is transmitted to the dichroic mirror through two mirrors; S2, a dichroic mirror transmits the composite light composed of continuous laser and pulsed laser to the beam selector; S3, the upper computer software controls the rotation of the beam selector, and the rotating beam selector realizes the switching between continuous laser and pulsed laser; S4, continuous laser or pulse laser is transmitted to the galvanometer through the beam selector and the beam expander; S5. The continuous laser or pulsed laser transmitted to the galvanometer is transmitted to the printing surface through the field lens; S6. Transmit to the printing format continuous laser or pulse laser to scan and process the metal powder.

2. The optical path transmission method for forging printing according to claim 1, characterized in that: In "step S1", the wavelengths of the continuous laser light and the pulsed laser light are different.

3. The optical path transmission method for forging printing according to claim 1, characterized in that: In "step S1", the two reflectors are arranged in parallel.

4. A printing method for forging printing, applied to the optical path transmission method for forging printing according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, control the beam selector to rotate and switch to continuous laser; S2, continuous laser scans the area within unit time through the galvanometer; S3. After the galvanometer completes the first scan, the beam selector rotates and switches to the pulse laser; S4, the pulse laser repeatedly scans the above-mentioned area through the galvanometer within a unit time; S5. Repeat the above process until the current layer is scanned and processed, and then start re-powdering to scan and process the next layer; S6. After all layers are scanned and processed, the forging printing process of the printed part is completed.

5. The printing method for forging printing according to claim 4, characterized in that: In "step S4", the scanning duration is the same as the first scanning duration.

6. The printing method for forging printing according to claim 4, characterized in that: In "steps S2 and S4", the duration of the scanning process can be set by the host computer software.

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