JPH05200881A - Three-dimensional model molding device - Google Patents

Abstract

PURPOSE:To minimize the volume shrinkage at the time of curing photopolymerized resin in molding a three-dimensional model formed by using photopolymerized resin and improve further the finished shape accuracy without distortion. CONSTITUTION:Photopolymerized resin 1 is fed onto a transparent plate 2, and laser beam is emitted from an emission head 9 through the transparent plate 2 and photopolymerization is carried out. Solidified layers are fixed on a base plate 5, and said solidified layers are laminated successively on the base plate 5 by raising the Z-axis of the head 6. Shape control is carried out by shape scanning the emission head 9 by means of an NC control device 13, and processing to the photo-emission shape is performed. A supersonic vibration plate 7 is operated and the supersonic vibration is emitted during said photopolymerization curing to minimize the volume shrinkage at the time of curing cnd carry out molding high fished shape accuracy with little distortion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for molding a three-dimensional model using a photopolymerizable resin.

[0002]

2. Description of the Related Art When a photopolymerizable resin is irradiated with light, the irradiated portion undergoes a polycondensation reaction to solidify. Using this principle, a thin plate-shaped solidified layer is obtained by exposing a thin beam of light while scanning it in a desired path, and by sequentially stacking the solidified layers, a three-dimensional model of arbitrary shape can be obtained. Can be created. Conventionally, a radical reaction type resin is mainly used for the photo-curing reaction. This photopolymerizable resin is a mixture of a photopolymerizable oligomer, a photopolymerizable monomer, a photopolymerization initiator and the like. The photopolymerization initiator is first dissociated by light irradiation,
Radicals are generated. The radicals trigger the chain polycondensation of the oligomer or monomer, and the resin in the irradiated portion is solidified. The characteristics that this photopolymerizable resin should possess are that it has a low viscosity in the liquid state before curing and a small volume shrinkage during the curing reaction.However, a monomer is mixed as a photopolymerizable diluent. If the fluidity is increased to increase the curing shrinkage, it is difficult to satisfy both of the above.

[0003]

SUMMARY OF THE INVENTION In view of the above points, the present invention has an object to suppress the volume shrinkage of the photopolymerizable resin during curing to be small, and to further improve the finished shape accuracy without distortion. Is.

[0004]

[Means for Solving the Problems] In a three-dimensional molding apparatus for irradiating a light beam onto a photopolymerizable resin in a three-dimensional shape to carry out a polymerization and curing treatment, the photopolymerizable resin is exposed to the photopolymerizable resin during the irradiation with the light beam. It is characterized in that a vibration device for irradiating ultrasonic vibration is provided.

[0005]

As described above, according to the present invention, when the photopolymerizable resin is irradiated with a light beam for polymerization and curing treatment, the photopolymerizable resin is irradiated with ultrasonic vibration during the treatment so that the fluidity of the resin is improved. It is possible to accelerate the polycondensation action of an oligomer or a monomer, to reduce the distortion of the solidification of the light-irradiated portion, to improve the shape accuracy, and to perform the solidification treatment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 shows a system in which a base plate is pulled up in a resin, and 1 is a photopolymerizable resin and 2 is a transparent plate. The photopolymerizable resin 1 is supplied onto the transparent plate 2 by the pump 3, and the falling liquid is collected in the receiving tank 4 and continuously circulated so as to be supplied again by the pump 3. Reference numeral 5 denotes a base plate for fixing the solidified layer, which is moved and controlled by the drive head 6 in the vertical Z axis. Reference numeral 7 is a vibrating plate that applies ultrasonic waves to the resin from the base plate 5, 8 is a Z-axis control motor, and 9 is a head that irradiates a laser beam.
Illuminate from the bottom of the. 10 and 11 X head 9
The shape of the irradiation head 9 is scanned by this drive control by a motor that drives the axis and the Y axis. Reference numeral 12 denotes a laser oscillator, which is, for example, a He—Cd laser, and irradiates a pulse laser from the scanning head 9. Reference numeral 13 denotes an NC control device, which controls driving of the X-axis, Y-axis, and Z-axis motors, and controls the laser oscillator 12.

In the above, when the base plate 5 is immersed in the photopolymerizable resin 1 and a laser beam is irradiated from the head 9 through the transparent plate 2 into the resin, the solidified photopolymerized layer is fixed to the plate 5. Formed. NC controller 13
In the shape control by, the numerical model is cut in the horizontal direction at equal intervals in the height direction according to the shape designed by CAD, the slice graphic data group is stored in memory, and the slice graphic is taken out from the lower end to obtain the X-axis motor 10. The Y-axis motor 11 is driven and controlled, and the irradiation head 9 is shape-scanned to form a solidified layer having an irradiation shape of the light beam. After solidifying one layer, the head 6 having a predetermined unit length is driven by driving the Z-axis motor 8, the base plate 5 is pulled up, and the irradiation head 9 is shape-scanned again to form the next cured layer on the previous solidified layer. The three-dimensional model is formed by stacking and sequentially scanning the two-dimensional shape with the light beam and solidifying and stacking. When the photopolymerized resin is vibrated by operating the ultrasonic vibration plate 7 during the polymerization and curing treatment of the resin 1 by the light irradiation, the fluidity of the resin is improved and the resin is well supplied to the laminated portion. In addition, the condensation polymerization action is promoted, and the slow-relaxation reaction allows precise molding without subsequent shrinkage of curing.

For example, using a He-Cd laser of 100 mw, using 66% of an oligomer, 33% of a monomer, and 1% of a polymerization initiator (BME) as a photopolymerizable resin, the laser irradiation time is 0.1 mm in width and a width of 0. The result of irradiating with 01 mm for 10 seconds and obtaining the cure shrinkage is as shown in FIG. Ultrasonic irradiation is at 50 KHz and 25 W, "horizontal" acts in parallel to light, and "vertical" is when ultrasonic waves are radiated in a direction perpendicular to the light. The shrinkage dimension is expressed in%, and is compared with the case where ultrasonic waves are not added (“none”). When ultrasonic waves were not applied ("nothing"), there was a contraction of about 10%, compared to this, the amount of contraction by ultrasonic irradiation was 1/2 or less, and especially by horizontal irradiation it was 3% or less. ..

Next, the photopolymerizable resin was supplemented with SiO ₂ and W.
When 15% of particles having an average particle size of 3 μφ vapor-deposited with 08 μm are mixed and a resin in which the proportion of monomers is reduced by that amount is used, the shrinkage is about 1.2%, and extremely high precision molding can be performed. It was

It should be noted that plastic particles or the like can be used for the fine particles to be mixed in, and this surface treatment can be performed by coating with another material in order to control reflection and transmission of light.

In the above embodiments, the regulated liquid level method using a transparent plate for lamination was described, but it is also possible to perform the free liquid level method in which light irradiation is performed from above. Also, the irradiation of ultrasonic waves can be applied to the photopolymerizable resin in the light irradiation portion in addition to the base plate.

[0011]

As described above, according to the present invention, when the photopolymerizable resin is irradiated with light for polymerization and curing, the photopolymerizable resin is irradiated with ultrasonic vibration during the process. In addition to enhancing the fluidity of the resin, it also promotes the condensation polymerization of oligomers and monomers, reduces the curing shrinkage, and enhances the shape accuracy for solidification molding, which enables precise model production.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a graph showing the experimental results of the present invention.

[Explanation of symbols]

 1 Photopolymerizable Resin 2 Transparent Plate 5 Base Plate 6 Drive Head 7 Vibration Plate 8 Z-Axis Motor 9 Optical Head 10, 11 X, Y-Axis Motor 12 Laser Oscillator 13 NC Controller

Claims (1)

[Claims] 1. In a three-dimensional molding apparatus for irradiating a photopolymerizable resin with a light beam in a three-dimensional shape for polymerization and curing, ultrasonic vibration is applied to the photopolymerizable resin during the irradiation of the light beam. A three-dimensional model forming device, which is provided with a vibration device for irradiating.