KR101561111B1 - 3D Printer and Method for grinding of 3D Printer - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing method and a polishing apparatus for a three-dimensional printer printed by a three-dimensional printer, and more particularly to a method for polishing a three-dimensional molding using printing data of a three- .
To this end, the three-dimensional printer of the present invention includes a printing nozzle for printing a stereoscopic molding, a polishing member for polishing the surface of the stereolithography product printed by the printing nozzle, a driving unit for driving the printing nozzle and the polishing member, A storage unit for storing data necessary for printing or polishing; and a control unit for controlling the printing nozzle to print the data stored in the storage unit, and polishing the three-dimensional molding using data used for printing the three- And a control unit for controlling the polishing member.

Description

TECHNICAL FIELD [0001] The present invention relates to a three-dimensional printer and a three-dimensional printer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing method and a polishing apparatus for a three-dimensional printer printed by a three-dimensional printer, and more particularly to a method for polishing a three-dimensional molding using printing data of a three- .

Three Dimensional Printing Prototyping System is a system for molding a three-dimensional object using an ink jetting technique used in an ink-jet printer.

1, a conventional three-dimensional printing forming system 101 is a three-dimensional printing molding system 101 in which powder material contained in a material accommodating chamber 131 is pressed by a roller 137 or the like onto a shaping table 123 of a shaping chamber 121, When the thicknesses are supplied, the printing head 140 injects an adhesive material onto the cross-sectional layer corresponding to the three-dimensional molding A ', and stacks the corresponding cross-sections, thereby finally molding the three-dimensional molding A'.

At this time, the adhesive material injected from the printing head 140 uses a binder, which uses a liquid low-viscosity binder material so as to pass through as if it is ink, without blocking the fine nozzles of the printing head 140.

However, in such a conventional three-dimensional printing molding system, since the liquid low-viscosity binder which is an adhesive material injected from the printing head has a relatively low adhesive strength and a low curing speed, a considerable curing time is required even after the molding of the three- do.

Korean Unexamined Patent Publication No. 2000-0032328 (entitled " Method for Polishing a Mold Using a Liquid Honing Method and Automatic Polishing Machine ") includes the steps of mounting a mold in an automatic polishing apparatus for a mold; Deriving the shape of the mold into three-dimensional data by a measuring device to polish the mold of any shape and size; Determining the nozzle transfer route to the mold shape by the software and spraying the surface of the mold while transferring the nozzle along the nozzle transfer path to the surface of the mold to polish the cutting fluid mixed with artificial or natural powder, And polishing the surface of the mold. The present invention also provides a mold polishing method using the liquid honing method.

Korean Patent Laid-Open Publication No. 2013-0112251 (entitled "Surface Grinding Machine") discloses a glass grinding machine for grinding glass, crystal, sapphire, cubic, diamond and the like installed on a front window portion of a mobile phone, a tablet PC, The present invention relates to a curved grinding machine (1) capable of polishing a workpiece (G) of the same jewelry in a two-dimensional planar shape and a three-dimensional curved shape including a set of guide frames (10a , 10b); Upper and lower support plates 12a and 12b spaced upward and downward above the guide frames 10a and 10b; A plurality of abrasive light tips 25 are arranged on the upper and lower support plates 12a and 12b at regular intervals so as to correspond to a plurality of workpieces G in one or two rows, The spline shaft 19 and the motor 16 connected to each other are coupled to each other through the timing belt 18 so that the polishing optical tip 25 driven by the motor 16 rotates, A pore grinding means 15 for grinding each workpiece G fixed to a plurality of workpiece jig holders 70 positioned at an upper end thereof; The lower table 31 is lifted and lowered together with the nut member 34 through the screw feed force of the ball screw 33 driven by the lift motor 32 provided at the lower ends of the guide frames 10a and 10b And the stop table 41 connected to the left and right feed motors 42 by the pivot link 44 is moved from the lower table 31 to the left and right through the link action of the pivot link 44 by the driving of the left and right feed motors The upper table 51 connected to the forward and backward conveying motors 52 by the nut member 54 and the ball screw 53 which are mutually helically engaged with each other and driven by the forward and backward conveying motors 52 And a three-soccer table (30) in which forward and backward transporting operations are performed in which the nut member (54) is straightly fed back and forth from the stop table (41) through the screw feed force of the ball screw (53) A curved surface grinder is proposed.

Conventionally, a method of polishing a mold having various shapes has been described. However, there is no mention of a method of polishing a stereoscopic molding printed by a three-dimensional printer that prints a stereoscopic molding in a lamination manner.

A problem to be solved by the present invention is to provide a method for polishing a stereoscopic molding printed by a three-dimensional printer for printing a stereoscopic molding in a lamination manner.

Another problem to be solved by the present invention is to propose a method of polishing the inside or outside of a three-dimensional molding having an empty through-hole shape.

Another problem to be solved by the present invention is to propose a method of polishing a stereoscopic molding using printing data printed with a stereoscopic molding.

To this end, the three-dimensional printer of the present invention includes a printing nozzle for printing a stereoscopic molding, a polishing member for polishing the surface of the stereolithography product printed by the printing nozzle, a driving unit for driving the printing nozzle and the polishing member, A storage unit for storing data necessary for printing or polishing; and a control unit for controlling the printing nozzle to print the data stored in the storage unit, and polishing the three-dimensional molding using data used for printing the three- And a control unit for controlling the polishing member.

A three-dimensional printer having a printing nozzle for printing a three-dimensional object and a polishing member for polishing a three-dimensional object to be printed according to the present invention includes a storage space for storing data by polishing the surface of the three-dimensional object using data used for printing the three- Can be efficiently used.

Further, the polishing member includes a polishing portion having a different diameter, so that a polishing portion having a relatively large diameter is used when rapid surface polishing is required, and a polishing portion having a relatively small diameter is used when precise polishing is required Whereby the polishing time can be shortened and the precision polishing can be performed.

In addition, the three-dimensional molding having an inner hollow can be efficiently polished by using a polishing unit movable at a predetermined angle.

1 is a view showing the structure of a conventional three-dimensional printer.
2 is a diagram illustrating the structure of a three-dimensional printer according to an embodiment of the present invention.
3 is a view for explaining an FDM method of a three-dimensional printer.
4 is a block diagram illustrating the configuration of a three-dimensional printer according to an exemplary embodiment of the present invention.
5 is another diagram illustrating the structure of a three-dimensional printer according to an embodiment of the present invention.
6 is a view showing a shape of an abrasive member according to an embodiment of the present invention.
FIG. 7 illustrates a process of polishing a three-dimensional molding using an abrasive member according to an embodiment of the present invention.
Figure 8 illustrates a bed having a detachable structure in accordance with one embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

2 is a diagram illustrating the structure of a three-dimensional printer according to an embodiment of the present invention. Hereinafter, the structure of a three-dimensional printer according to an embodiment of the present invention will be described in detail with reference to FIG. Particularly, FIG. 2 will be described focusing on a bad structure of a three-dimensional printer.

2, the 3D printer includes a base member, a bed, a supporting member, a printing nozzle, and a cylinder. Of course, it is obvious that other configurations other than the above-described configuration can be included in the 3D printer proposed in the present invention.

The base member 210 functions to fix to the bottom surface of the 3D printer. Of course, when the 3D printer is configured as a box type, the base member 210 may be in the form of a box.

The bed 220 is located at the upper end of the base member 210 and is movable back and forth or from side to side with respect to the base member 210. The bed 220 and the base member 210 are connected by a cylinder so that the bed 220 moves back and forth or left and right with respect to the base member 210 by the movement of the cylinder.

In the present invention, the bed 220 is formed in a flat shape having a predetermined thickness, and in particular, the bed 220 has at least two separated structures, or is made of a material having elasticity, rather than being made of a hard material . The structure and material of the bad proposed in the present invention will be described later.

The support member 230 has one side connected to the base member 220 and the other side connected to the printing nozzle 240. In the context of the present invention, the support member 230 is of a rod type.

The printing nozzle 240 is connected to the support member 230 and moves back and forth or right and left by a cylinder formed inside the support member 230, and is particularly movable up and down. The printing nozzle 240 ejects the printing liquid through the nozzle according to a control command of the control means. That is, the printing liquid sprayed by the printing nozzle is stacked on the top of the bad, whereby the three-dimensional molding is printed on the top of the bad.

Of course, the support member 230 is connected to the base member 210, and the support member 230 can be moved back and forth, left and right, and up and down on the base member by the cylinder 250.

Further, when the bed 220 moves back and forth, right and left on the base member, the printing nozzle 250 can move only up and down with respect to the base member. Also, the bed 220 moves back and forth or left and right with respect to the base member, and the printing nozzle can move back and forth, or right and left, up and down with respect to the base member. In this case, the bed 220 moves forward, backward and left and right with respect to the base member before printing the three-dimensional molding by the printing nozzle, and the printing nozzle 240 can move up and down, left and right and back and forth in the process of printing the three- have.

Of course, the movement of the bad and the printing nozzle is performed by a control command of the control means. The control means may be integrally formed with the 3D printer or may be formed outside. When the control means is formed outside the 3D printer, the 3D printer includes communication means for receiving the control command.

As described above, the three-dimensional printer of the present invention prints stereoscopic objects using stored or input data. In connection with the present invention, a 3D printer performs 3D printing using a FDM (fused deposition modeling) method. In the FDM method, the filaments are melted to build up the layered structure. This is as shown in FIG.

As described above, the FDM method is disadvantageous in that the surface of the produced stereoscopic molding is not smooth. Therefore, the present invention proposes a method of polishing the surface of the produced stereoscopic molding. Particularly, the present invention proposes a method of polishing a surface of a manufactured stereoscopic molding using data for forming a stereoscopic molding. Of course, the surface of a stereoscopic molding manufactured by a 3D printer employing a SLP (Stereolithography Apparatus) or SLS (Selective Laser Sintering) method, which requires surface polishing as well as a 3D printer employing the above-described FDM method, Polishing can be performed.

In addition, the present invention can be applied to a 3D printer in which a stereolithography product manufactured by SLA (Stereolithography Apparatus) or SLS (Selective Laser Sintering) method is processed in a bead method. That is, after a post-processing is performed on a three-dimensional molding material in a bead manner, the three-dimensional molding material is polished through the polishing method proposed in the present invention. Specifically, a three-dimensional molding is manufactured using a 3D printer, and then a post-processing is performed in the 3D printer. Then, the surface of the three-dimensional molding is polished using an abrasive member. Alternatively, a stereoscopic molding is manufactured using a 3D printer, and then a post-processing is performed outside the 3D printer in the state that the stereolithography is attached to the bed. Thereafter, the post-processed three-dimensional sculpture is moved into the 3D printer, and then the surface of the three-dimensional sculpture is polished. By doing so, since the position of the three-dimensional molding on the bed is not changed, the polishing process can be performed using the dimension data used in the printing process.

Hereinafter, a method of polishing the surface of the manufactured three-dimensional object will be described in detail.

4 is a block diagram illustrating the configuration of a three-dimensional printer according to an exemplary embodiment of the present invention. Hereinafter, the configuration of a three-dimensional printer according to the present invention will be described in detail with reference to FIG.

Referring to FIG. 4, the three-dimensional printer includes a printing nozzle, a polishing member, a control unit, a storage unit, and a driving unit. Of course, other configurations than the above-described configuration may be included in the three-dimensional printer proposed in the present invention.

The storage unit 430 stores a driving program for driving the three-dimensional printer proposed in the present invention. In addition, the storage unit 430 stores information on the stereoscopic objects to be printed by the 3D printer. That is, the three-dimensional printer stores dimension data for at least one stereoscopic molding, and prints the stereoscopic molding using stored dimension data.

The printing nozzle 240 prints the stereoscopic molding according to the control command of the controller 410 using the numerical data stored in the storage unit 430. As shown in FIG. 3, the three-dimensional printer of the present invention prints a three-dimensional object using an FDM method.

The polishing member 420 polishes the printing stereoscopic material by the printing nozzle according to the control command of the control unit 410 using the numerical data stored in the storage unit 430. In particular, the present invention polishes stereoscopic sculptures using numerical data used in printing stereoscopic sculptures. That is, the storage unit 430 stores only one data, not the numerical data used for printing the stereoscopic molding and the numerical data used for polishing the printed stereoscopic model. By storing only one piece of data in this manner, the low-level storage can efficiently use the storage space.

The driving unit 440 drives the printing nozzle 240 or the polishing member 420 according to a control command of the control unit 410. Further, the driving unit 440 drives the bad if necessary according to the control command of the control unit 410. [

The control unit 410 controls the operation of the three-dimensional printer. That is, the controller 410 controls the printing nozzle 240 to print the three-dimensional object, and controls the polishing object 420 to polish the printed three-dimensional object. In particular, the controller 410 of the present invention performs a printing process and a polishing process using one numerical data stored in the storage unit 430.

5 is another diagram illustrating the structure of a three-dimensional printer according to an embodiment of the present invention. Hereinafter, the structure of a three-dimensional printer according to an embodiment of the present invention will be described in detail with reference to FIG.

According to Fig. 5, the three-dimensional printer includes a printing nozzle and at least one abrasive member. Further, in the three-dimensional printer of the present invention, the printing nozzle is located on the upper side and the abrasive member is located on the side. Hereinafter, the operation of the printing nozzle and the polishing member constituting the three-dimensional printer will be described in detail with reference to FIG.

As described above, the printing nozzle 240 prints the stereoscopic objects using the numerical data stored in the storage unit 430 or the numerical data transmitted from the outside according to the control command of the controller 410. In particular, the printing nozzle 240 is located at the top of the bed, printing the three-dimensional object in a laminated form, and the surface of the three-dimensional object printed by the printing nozzle 240 needs to be polished. That is, as shown in Fig. 3, the surface of the stereolithography printed by the printing nozzle is not smooth, and therefore, a polishing process is indispensably required.

The polishing member 420 is located at a relatively low position relative to the printing nozzle 240 and is movable up and down. The polishing member 420 performs a polishing operation according to a control command of the control unit 410, not only when the three-dimensional molding is completed by the printing nozzle 240, but also before completion. Even before the three-dimensional molding is completed by the printing nozzle 240, the time required for manufacturing the three-dimensional molding can be reduced by performing the polishing operation according to the control command of the control unit.

That is, when the stereolithography product is manufactured by the printing nozzle, the surface of the stereolithography product manufactured using the polishing member 420 is polished. Of course, in this case, the polishing member 420 polishes the surface of the three-dimensional molding using the numerical data used in manufacturing the three-dimensional molding by the firing nozzle.

6 is a view showing a shape of an abrasive member according to an embodiment of the present invention. Hereinafter, the shape of the abrasive member according to an embodiment of the present invention will be described in detail with reference to FIG.

According to Fig. 6, the polishing member is not composed of one polishing portion, but is composed of at least two polishing portions. That is, the polishing member includes at least two polishing portions 620 and 630 having different diameters of the portions contacting the three-dimensional workpiece. More specifically, in the case where the surface of the three-dimensional object has a relatively large area, the polishing unit 630 having a relatively large diameter is used. When the area of the three-dimensional object has a relatively small flat area, the diameter is relatively small The polishing portion 620 is used to perform polishing. As described above, the three-dimensional molding can be polished by using the polishing portions having different diameters, thereby shortening the polishing time and performing accurate polishing. That is, the polishing time can be shortened by polishing the surface of the three-dimensional molding using the polishing portion having a relatively large diameter, and precision polishing can be performed by polishing the surface of the three-dimensional molding using a polishing portion having a relatively small diameter.

Also, the terminating ends of the polishing units 620 and 630 of the present invention are not fixed with respect to the body 610, but move at a certain angle. That is, the terminating ends of the polishing units 620 and 630 can move freely by a predetermined angle with respect to the axis of the body 610. In this case, the angle that can be moved according to the diameter of the polishing portion is set differently. That is, the polishing portion having a relatively small diameter has a larger angle of movement than the polishing portion having a relatively large diameter. Described in more detail, a polishing portion having a relatively small diameter is used for a portion requiring precise polishing, and therefore, a moving angle is set to be large. A polishing portion having a relatively small diameter is not used for a portion requiring precise polishing. Set it small.

As described above, the polishing member of the present invention and the polishing member composed of the body include at least two polishing portions having different diameters, and the ends (polishing wheels) of the polishing portions having different diameters have different angles at which they can move with reference to the reference axis.

Further, when the polishing section is spaced a certain distance, the three-dimensional molding can be polished by using at least two polishing sections at the same time. Of course, when the distance between the two polishing portions is within a predetermined distance, polishing is performed using one polishing portion. That is, the polishing portion can move freely into the body, and when one of the at least two polishing portions performs polishing, the other remaining polishing portion enters the inside of the body. By doing so, the polishing unit performing polishing can be polished without being disturbed by other polishing units.

FIG. 7 illustrates a process of polishing a three-dimensional molding using an abrasive member according to an embodiment of the present invention. Hereinafter, a process of polishing a three-dimensional molding using the polishing member according to an embodiment of the present invention will be described in detail with reference to FIG.

According to Fig. 7, the three-dimensional molding has an inner hollow shape, and the abrasive member polishes a three-dimensional molding having an inner hollow shape. The through hole may be located on the side surface of the three-dimensional molding or may be located at the bottom.

Hereinafter, a method of grinding the surface of the three-dimensional molding on the side of the through hole will be described. As described above, the three-dimensional object having the through-hole located on the side thereof is printed with the printing nozzle and the surface of the three-dimensional object is polished by using the polishing unit. That is, the three-dimensional molding, in which the through-hole is located on the side, can polish the three-dimensional molding while the three-dimensional molding is fixed to the bed.

However, the stereolithography product in which the through hole is located at the lower end performs the polishing process on the surface after the printing of the stereolithography product is completed by the printing nozzle. In addition, since the stereoscopic molding is printed using the numerical data stored in the storage unit and the printed stereoscopic molding is polished, the position information at the time of printing the stereoscopic molding based on the bad and the position information at the time of polishing must be the same. That is, when the three-dimensional object is printed, when the positional information is different from the position information when polishing, the three-dimensional object can not be printed or polished using one numerical data.

Therefore, in the present invention, the position information at the time of printing the three-dimensional object on the basis of the bad and the position information at the time of polishing should be the same. For this purpose, a stereoscopic molding is printed using a printing nozzle on the top of the bed, and then the stereoscopic molding is polished in a state where the positional information is not changed on the bed.

Therefore, the present invention proposes a bed having two separate structures. That is, the bad is divided into either the vertical or the horizontal direction as shown in FIG. To this end, the present invention divides the bad into at least three regions, and some of the divided regions can be controlled by being distinguished from other regions. That is, some of the divided regions are controlled so as to move from the fixed state to the lower end. After the part of the bad has moved to the lower end, the abrasive member is drawn into the through hole formed at the lower end of the three-dimensional molding, and the abrasive member polishes the inner surface of the three-dimensional molding.

As such, the present invention does not maintain the fixed state of the bed, but a part of the bed is separated from the remaining part so that the abrasive member can polish the inner surface of the three-dimensional molding. The polishing member polishes the inner surface of the three-dimensional molding while the part of the bad is separated. Of course, as described above, the polishing member includes at least two polishing portions having different diameters, and the polishing portion moves at an angle to polish the inner surface of the three-dimensional molding. That is, the present invention proposes a bad having a separate structure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention .

210: base member 220: bad
230: support member 240: printing nozzle
250: cylinder 410: control unit
420: abrading member 430:
440:

Claims (5)

A printing nozzle for printing a three-dimensional object;
A polishing member for polishing the surface of the stereolithography printed by the printing nozzle;
A driving unit for driving the printing nozzle and the polishing member;
A storage unit for storing data necessary for printing or polishing the stereolithography; And
A control unit controlling the printing nozzle to print the data stored in the storage unit and controlling the polishing member to polish the three-dimensional molding using data used for printing the three-dimensional molding; And
And a bad to which the stereolithography is printed,
Wherein the bad is divided into at least two areas including a first area and a second area, and the first area relatively moves with reference to the second area.
The polishing apparatus according to claim 1,
Body;
And at least two polishing portions having different diameters to be drawn or drawn out from the body,
Wherein the polishing unit moves by a predetermined angle about a reference axis.
3. The method of claim 2,
Wherein the polishing portion having a relatively small diameter has a large angle of movement as compared with a polishing portion having a relatively large diameter.
delete [4] The method of claim 3, wherein the three-dimensional molding has a through hole at the bottom,
The first region is separated from the second region in a state where the three-dimensional object is fixed to the second region, and is introduced into the through-hole formed at the bottom of the three-dimensional object via the space formed by separating the first region And the abrasive member.

Images