CN202764224U - Laser control device in photo-cured stereoscopic model - Google Patents

Abstract

The laser control device in photocuring three-dimensional modeling includes a base (1), a laser filter plate (2), a base fixing screw (3) and a laser filter plate fixing screw (4), the laser filter plate (2) and The base (1) is fixed on the laser fixing plate after fitting through the chute; it is characterized in that: the laser filter plate (2) has a 4mm round hole, and the laser filter plate (2) passes through the base (1) Adjust the position of the laser spot to change the halo around the spot to control the size of the laser spot. In the utility model, after the laser filter plate and the base are assembled, they are fixed between the second reflector outside the laser and the scanning galvanometer. Through position adjustment, the size of the light spot irradiated on the resin liquid surface is ensured, so that the production requirements of the photocuring product , and can avoid unnecessary waste of photosensitive resin and reduce production cost.

Description

Laser control device in stereolithography

technical field

The utility model relates to the control technology of laser size in rapid prototyping, in particular to a laser control device in light-cured three-dimensional modeling. Therefore, the performance of the light-cured three-dimensional modeling product is improved, and the production cost of the light-curing three-dimensional modeling product can be effectively controlled.

Background technique

Rapid prototyping (RP) technology is an advanced manufacturing technology developed in the 1980s. RP technology is integrated and developed on the basis of modern CAD/CAM technology, laser technology, computer numerical control technology, precision servo drive technology and new material technology. The basic principle is to directly generate a three-dimensional solid model from the CAD digital model through the method of material accumulation under the control of the computer. The more mature process method is SLA-Stereolithography. This technology uses photosensitive resin as raw material, and the ultraviolet laser under computer control scans the liquid resin point by point according to the outline of each layered section of the predetermined part, so that the thin layer of resin in the scanned area undergoes photopolymerization reaction, thereby forming the part's A thin section. When one layer is cured, move the workbench, and then apply a new layer of liquid resin on the surface of the previously cured resin to scan and cure the next layer. The newly cured layer is firmly bonded to the previous layer, and this is repeated until the entire product prototype is manufactured. Stereolithography (SLA) is characterized by "manufacturing layer by layer, superimposing layer by layer", which is similar to the integral process in mathematics, and directly accepts product design (CAD) data without preparing any molds, knives and fixtures. , to quickly manufacture samples or models of new products. The application of this technology can greatly shorten the development cycle of new products, reduce development costs and improve development quality.

However, in the actual production of stereolithography (SLA), it is found that after a long period of use, due to the internal factors of the laser, the laser light emitted from the laser is reflected by the scanning galvanometer, and the light spots on the resin liquid surface will be different. It becomes larger and forms a halo around the spot, and the size of the halo is more than 10mm (generally, the best outer diameter of the laser spot is 0.12mm, and the halo around the spot is about 4-5mm. In this case, the performance of the light-curing product is the best), so the strength of the light-curing three-dimensional modeling (SLA) product is not enough, the surface is sticky, the external dimension of the product is affected, it is no longer accurate, and a thin film is formed on the resin liquid surface around the product, The formed film resin cannot be recycled, it can only be taken out from the liquid surface and thrown away, the modeling resin is wasted, and the photosensitive resin is generally imported material, the price is expensive, about RMB 2 per gram, large-area film, improve Reduced the cost of rapid prototyping.

Contents of the invention

Aiming at the deficiencies of the existing technology, the purpose of this utility model is to provide a laser control device in photocuring three-dimensional modeling, which is a device for changing the size of the light spot outside the laser, which can ensure the technical requirements of the product and reduce the cost.

The technical scheme adopted by the utility model is: the laser control device in the light-cured three-dimensional modeling includes a base, a laser filter plate, a base fixing screw and a laser filter plate fixing screw, and the laser filter plate and the base are matched through a chute. Finally, it is fixed on the laser fixing plate; it is characterized in that: the laser filter plate has a 4mm circular hole, and the position of the laser filter plate on the base is adjusted to change the halo around the spot to achieve the effect of controlling the size of the laser spot.

Both the laser control filter and the base are made of 45# steel.

In the structure of the utility model, the laser filter plate and the base are assembled and fixed between the second reflector outside the laser and the scanning galvanometer. There is a 4mm round hole on the laser filter plate. Through position adjustment, the laser light passing through the reflector The center passes through the round hole on the laser filter plate, and the laser filter plate itself blocks the redundant halo around the laser to ensure the size of the spot on the resin liquid surface, so as to meet the production requirements of light-cured products and avoid unnecessary waste of photosensitive resin , to reduce production costs.

Description of drawings

Fig. 1 is a schematic diagram of the assembly structure of the present utility model.

Fig. 2 is a schematic diagram of the structure of the base of the utility model.

Fig. 3 is a structural schematic diagram of the laser filter plate of the present invention.

In the figure: 1 base, 2 laser filter plate, 3 base fixing screws, 4 laser filter plate fixing screws.

Detailed ways

As shown in FIG. 1 , the laser control device in the photocuring three-dimensional modeling is composed of a laser filter plate 2 , a base 1 , a base fixing screw 3 and a laser filter plate fixing screw 4 . The laser filter plate 2 and the base 2 are fixed on the laser fixing plate 2 after fitting through the chute. Both the laser control filter plate 2 and the base 1 are made of 45# steel.

As shown in Figure 2, it is a schematic diagram of the base of the present utility model. The base 1 is provided with a base fixing screw hole and a laser filter plate fixing screw hole.

As shown in FIG. 3 , it is a schematic diagram of a laser filter plate of the present invention. Because the diameter of the halo around the laser spot is 4-5mm, there is a 4mm round hole on the laser filter plate 2. By adjusting the position of the laser filter plate 2 on the base 1, the halo around the spot can be changed to achieve control of the laser spot. The role of size.

Firstly, the outline of the base 1 and the laser filter plate 2 is processed by wire cutting, and then the matching groove between the two is processed by wire cutting, and the sliders of the two are required to cooperate. On the base 1, use a drilling machine to process the base fixing screw holes and the laser filter plate fixing holes. Insert the laser filter plate into the matching groove of the base, and then place the two between the second reflector and the scanning galvanometer on the laser fixing plate, turn on the power of the laser, and let the laser pass through the round hole on the laser filter plate. Adjust the position of the base and the laser filter plate by observing the shape (circle) of the light spot on the resin liquid surface; after the adjustment, fix the base on the laser mounting plate with the base fixing screw, and then observe the resin liquid surface If the position of the upper spot is inaccurate, it can be controlled by adjusting the laser filter plate in the chute of the base. After adjustment, finally fix the laser filter plate and the base with the laser filter plate fixing screws.

Its working process: the laser is emitted from the laser, passes through two reflective lenses, and then passes through the circular hole on the laser filter plate in the utility model, and finally reaches the resin liquid surface through the scanning galvanometer, and produces products through the movement of the scanning galvanometer.

Claims (2)

1. laser control apparatus in the photocuring three-dimensional contouring, comprise pedestal (1), laser filter plate (2), pedestal hold-down screw (3) and laser filter plate hold-down screw (4), described laser filter plate (2) and pedestal (1) are fixed on the laser instrument fixed head after cooperating by chute; It is characterized in that: on the described laser filter plate (2) the 4mm circular hole is arranged, adjust by the position of laser filter plate (2) on pedestal (1), change the halation of hot spot border, reach control laser instrument hot spot size.

2. laser control apparatus in the photocuring three-dimensional contouring according to claim 1, it is characterized in that: the material of described laser controlling filter (2) and pedestal (1) all is the 45# steel.

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