KR101849600B1 - Three dimensional printer with auto leveling device for building plate - Google Patents

Abstract

The present invention relates to a three-dimensional printer having a shaping plate origin point adjusting device capable of accurately moving a shaping plate to a starting position in a three-dimensional structure output, comprising: a resin reservoir storing a photocurable resin and a lower transparent material; A light source for irradiating light to a lower portion of the resin reservoir; An upstanding support formed vertically; A horizontal support cantileverably supported on the upright support; A driving unit for vertically moving the horizontal support; A shaping plate coupled to the horizontal support and arranged to move up and down on the resin reservoir and having a three-dimensional structure formed thereunder; A force sensor for measuring a force applied to the horizontal support; And a control unit for controlling the light source and the driving unit in correspondence with the forming area of the three-dimensional structure, wherein the control unit controls the driving unit to move the shaping plate in accordance with the force measured by the force sensor at the start of the output of the three- And controls the driving unit to be disposed at the origin.

Description

TECHNICAL FIELD [0001] The present invention relates to a three-dimensional printer having a forming plate origin point adjusting device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional printer having a forming plate origin point adjusting device, and more particularly to a three-dimensional printer having a forming plate origin point adjusting device capable of accurately moving a forming plate to a starting position .

In the three-dimensional printing method, a SLA (Stereolithography Apparatus) method using a principle in which a scanned portion is cured by scanning laser light to a photo-curable resin, a functional polymer or a metal powder is used in place of a photo- SLS (Selective Laser Sintering) method using principle of injection molding and curing, FDM (Fused Deposition Modeling) method in which filament is extruded and laminated structure, and partially cured And a DLP (Digital Light Processing) method using the principle.

In the case of the DLP type three-dimensional printer, the DLP projector irradiates light to the lower portion of the transparent material storage tank storing the photo-cured resin, and the photo-curing resin in the light- Dimensional structure. That is, light is irradiated in a form corresponding to the cross-sectional shape of the three-dimensional structure, and the three-dimensional structure can be printed by stacking the cured portions in multiple layers as the molding plate rises.

However, in the case of the conventional DLP type three-dimensional printer, in order to start the output of the three-dimensional structure, the shaping plate must be moved to a position where the shaping plate is in contact with the bottom surface of the storage tank, It is difficult to confirm whether or not the molding plate and the storage tank are in contact with each other. If the output starts when the molding plate and the storage tank are not properly in contact with each other, defects may occur in the shape of the three- The output stability of the structure is deteriorated.

Korean Patent Publication No. 10-2016-0055707

The present invention has been proposed in order to solve the above-mentioned problems. Since the automatic leveling function capable of automatically locating the origin using a precision force sensor is provided, the output starts from an accurate origin, Dimensional printer having a forming plate origin point adjusting device.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a resin reservoir storing a photocurable resin; A light source for irradiating light to a lower portion of the resin reservoir; An upstanding support formed vertically; A horizontal support cantileverably supported on the upright support; A driving unit for vertically moving the horizontal support; A shaping plate coupled to the horizontal support and arranged to move up and down on the resin reservoir and having a three-dimensional structure formed thereunder; A force sensor for measuring a force applied to the horizontal support; And a control unit for controlling the light source and the driving unit in correspondence with the forming area of the three-dimensional structure, wherein the control unit controls the driving unit to move the shaping plate in accordance with the force measured by the force sensor at the start of the output of the three- And controls the driving unit to be disposed at the origin.

Here, the horizontal support body may include: a front flow unit that is a housing coupled to the molding plate; And a rear fixing part which is a housing fixedly coupled to the upright support body. The power generating machine generates an electric signal corresponding to a force applied to the front side moving part, and outputs the generated electric signal to the control part have.

Further, the forceps is a beam-type structure having one end fixed in the front fluid chamber and the other end fixed in the rear fixing part, and deformed by a contact force; And a piezoresistive layer for sensing the deformation of the beam-like structure and generating the electrical signal.

Meanwhile, the control unit may determine whether the shaping plate is mounted by the electrical signal.

In addition, the controller may determine whether the three-dimensional structure attached to the shaping plate is separated by the electrical signal.

The controller may include a first step of raising the molding plate to the uppermost position at the start of the output of the three-dimensional structure, a second step of lowering the molding plate to a predetermined position below the uppermost position, And a third step of lowering the shaping plate to the origin, thereby controlling the driving unit, and the descending speed of the second step may exceed the descending speed of the third step.

In addition, the controller may control the driving unit such that the forming plate is intermittently lowered by a predetermined height according to a step-down type method in the third step.

Embodiments of the disclosed technique may have effects that include the following advantages. It should be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, since the embodiments of the disclosed technology are not meant to include all such embodiments.

The three-dimensional printer provided with the forming plate origin adjusting device according to the present invention provides an auto leveling function that can automatically find the origin by using a precision force sensor, so that the inconvenience that a user manually moves the forming plate is reduced In addition, since the output of the three-dimensional structure is automatically started on the shaped plate disposed at the correct origin, the quality of the printed three-dimensional structure is improved.

FIG. 1 and FIG. 2 are views showing a three-dimensional printer having a forming plate origin point adjusting device according to an embodiment of the present invention.
3 and 4 are views showing a horizontal support and a force sensor of a three-dimensional printer having a forming plate origin point adjusting device according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating an operation of a three-dimensional printer having a forming plate origin point adjusting apparatus according to an embodiment of the present invention.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the disclosed technology should be understood to include equivalents capable of realizing technical ideas.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms " first, " " second, " and the like are used to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It is to be understood that the singular " include " or "have" are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Each step may take place differently from the stated order unless explicitly stated in a specific order in the context. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosed technology belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted to be consistent with meaning in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless expressly defined in the present application.

1 and 2 are views showing a three-dimensional printer having a forming plate origin point adjusting device according to an embodiment of the present invention. In the three-dimensional printer having the forming plate origin point adjusting device of the present invention, A light source 200, an upright support 300, a horizontal support 400, a driving unit 500, a molding plate 600, a force sensor 700, and a control unit 800.

The resin storage part (VAT) 100 stores a photo-curing resin such as acrylic resin, castable resin, etc. as a liquid material for forming a three-dimensional structure, Respectively. Here, it is preferable that the lower part of the transparent material of the resin storage part 100 is made of a material having excellent releasability to the three-dimensional structure, light permeability of the light source 200, and durability. Further, the resin storage portion 100 provides a space in which the photo-curing resin is cured by the light irradiated from the light source 200. [

The light source 200 irradiates light that hardens the photocurable resin to the lower portion of the resin storage portion 100. [ Here, the light source 200 receives a divided image, for example, a G code image file generated from an STL (STereoLithography) file or OBJ file by slicing software from the control unit 800, And may be a DLP projector that emits light corresponding to an image.

The upright support 300 is provided vertically to provide a path for lifting up and down the molding plate 600 attached to the horizontal support 400. [

The horizontal support 400 includes a cantilevered support structure 300 which is coupled to the upright support 300 such that it can be raised and lowered along the upright support 300 and one end is supported by the upright support 300 to maintain its long axis in the horizontal direction I have. The shaping plate 600 is connected to the other end of the horizontal support member 400.

The driving unit 500 provides power such that the horizontal supporting member 400 is lifted and lowered along the upright supporting member 300 under the control of the control unit 800. For example, a thread is formed on the upright support 300 and a structure (not shown) is provided at one end of the horizontal support 400, which is coupled to the upright support 300, to convert rotational motion into linear motion, The horizontal support 400 may be lifted and lowered in accordance with the normal rotation of the motor (not shown) in the apparatus 500. However, the present invention is not limited thereto.

The molding plate 600 is connected to the horizontal support member 400 and is arranged to be raised or lowered above the resin storage unit 100 and a three dimensional structure formed by curing the photo- .

The force sensor 700 measures the force applied to the horizontal support and outputs the measured value to the control unit 800. [ At this time, the force sensor 700 is preferably a high-strength force capable of supporting a weight of about 10 kg, but is not limited thereto.

The control unit 800 controls the light source 200 and the driving unit 500 according to the molding region of the three-dimensional structure. That is, the control unit 800 receives a control code such as a G code reflecting a cross-sectional image of the three-dimensional structure from a PC (Personal Computer) or a USB memory having a calculation function, And the like. The control unit 800 controls the driving unit 500 such that the molding plate 600 is gradually raised in a direction parallel to the longitudinal axis of the upright support 300 in order to solidify the three- . At this time, the control unit 800 may include a function of slicing an STL file or an OBJ file to generate a control code such as a G code, but is not limited thereto.

The control unit 800 controls the driving unit 500 to arrange the shaping plate 600 at the origin A according to the force sensed by the force sensor 700 at the start of the output of the three-dimensional structure. Herein, the origin A means the initial output position of the three-dimensional printer, and the forming plate 600 is in contact with the bottom of the resin storage part 100.

3 and 4 are views showing a horizontal support 400 and a force sensor 700 of a three-dimensional printer provided with a forming plate origin point adjusting device according to an embodiment of the present invention.

The horizontal support body 400 may include a front side moving part 410 and a rear side fixing part 420 which are separate housings.

The front flow portion 410 may include a screw structure for coupling with the molding plate 600, but is not limited thereto. At this time, the front moving part 410 forms a predetermined space with the rear fixing part 420 so as to be able to flow under the force when the molding plate 600 contacts the bottom of the resin storage part 100, .

The rear fixing part 420 is a housing which is fixedly coupled to the upright support 300. The rear fixing part 420 is fixed by a force acting in a direction opposite to the bottom when the molding plate 600 contacts the bottom of the resin storage part 100 It is possible to maintain the fixed state even when the front flow portion 410 flows.

The force sensor 700 generates an electric signal corresponding to the force applied to the front fluid dynamic portion 410 and outputs the generated electric signal to the controller 800. [ Here, the force sensor 700 may include a beam-type structure 710 and a piezoresistive layer 720.

One end of the beam-like structure 710 is fixed in the front flow portion 410 and the other end is fixed in the rear fixing portion 420, and can be deformed by the contact force. That is, the beam-type structure 710 has a connection structure of the front fluid guide part 410 and the rear surface fixing part 420 separated from each other and at the same time the molding plate 600 contacts the bottom of the resin storage part 100, And one end may be deformed as the earthed portion 410 rises. At this time, the beam-type structure 710 may have a screw structure for engaging with the front side moving part 410 and a screw structure for engaging with the rear side fixing part 420, but is not limited thereto.

The piezoresistive layer 720 senses the deformation of the beam-like structure 710 to generate an electric signal and transmits an electric signal generated through a predetermined wire (not shown) connected to the controller 800 to the controller 800, .

The beam-like structure 710 may have a predetermined hole in the vicinity of the piezoresistive layer 720 in order to be easily deformed by the force transmitted through the shaping plate 600. [

The control unit 800 receives an electric signal from the piezoresistive layer 720 and can calculate the force applied to the front fluid flow unit 410 according to the input electric signal.

At this time, the control unit 800 can determine whether the shaping plate 600 is in contact with the bottom of the resin storage unit 100 according to the calculated value, and can also determine whether the shaping plate 600 is in contact with the front flow unit 410 , It can be determined whether or not the output attached to the shaping plate 600 is deviated during the output of the three-dimensional structure. That is, the beam-type structure 710 can be deformed in the direction of gravitational acceleration due to the portion of the beam-type structure 710 coupled with the front fluidity portion 410, and the molding plate 600 is mounted on the front fluidity portion 410, The second state where the shaping plate 600 is attached to the front flow portion 410 but the three-dimensional structure is not attached to the lower portion and the shaping plate 600 is attached to the front flow portion 410, it is most deformed in the direction of gravitational acceleration in the first state, and the degree of deformation is relaxed in the order of the second state and the third state. Accordingly, the controller 800 can receive the electrical signals generated in the piezoresistive layer 720 corresponding to the degree of deformation of the beam-like structure 710 and grasp various states of the three-dimensional printer.

FIG. 5 is a flowchart illustrating an operation of a three-dimensional printer having a forming plate origin point adjusting apparatus according to an embodiment of the present invention. Referring to FIGS. 1 to 5, The operation of the printer will be described below.

First, when an input signal for the user to use the three-dimensional printer is sensed, the control unit 800 determines whether or not the value outputted by the current force sensor 700, that is, the electric signal generated in the piezoresistive layer 720 And stores the calculated value (S100).

The control unit 800 then detects whether the horizontal support 400 coupled with the molding plate 600 is positioned at the uppermost position on the path of the upright support 300 (S200).

If the horizontal support 400 coupled with the molding plate 600 is not located at the top of the path of the upright support 300, the controller 800 controls the driving unit 500 to move the molding plate 600, And the horizontal support 400 coupled to the horizontal support 400 is raised to the uppermost position (S300).

When the horizontal support 400 coupled to the molding plate 600 is located at the uppermost position on the path of the upright support 300, the control unit 800 controls the driving unit 500 to rotate the molding plate 600 The combined horizontal support 400 is lowered to the first position B, which is a predetermined position lower than the uppermost point and above the origin (S400).

At this time, the control unit 800 receives the electric signal generated from the piezoresistive layer 720 and determines whether the force applied to the force sensor 700 is in the normal range (S500).

If the controller 800 determines that the force applied to the force sensor 700 is not within the normal range, the controller 800 immediately stops the lowering operation of the horizontal support 400 coupled with the molding plate 600, (S600). An example in which the control unit 800 determines that the force applied to the force sensor 700 is not within the normal range is that the shaping plate 600 is not coupled to the horizontal support 400, A case where the force of the gravitational acceleration direction is applied to the force sensor 700 is small and the force sensor 700 is broken. In addition, when the control unit 800 can judge the abnormality, It can include all of the abnormal conditions which can be judged according to the magnitude and direction of the losing force.

If the control unit 800 determines that the force applied to the force sensor 700 is within the normal range, the control unit 800 controls the driving unit 500 to rotate The horizontal support 400 is lowered to the origin A (S700). At this time, when the horizontal support 400 coupled with the molding plate 600 is lowered from the uppermost position to the first position B, the control unit 800 rotates the horizontal support body 400 coupled with the molding plate 600 at a relatively high speed 400 is lowered from the first position (B) to the origin (A) at a relatively slow speed, the accuracy of the origin placement can be increased while increasing the operating speed.

In this case, when the controller 800 moves the horizontal support 400 coupled to the molding plate 600 from the first position B to the origin A, the horizontal support 400 moves in a stepwise descent manner The control unit 800 can control the driving unit 500. For example, the control unit 800 may intermittently lower the horizontal supporting member 400 by about 20 占 퐉, and the electric signal input from the force sensor 700 That is, a value corresponding to the case where the bottom of the shaping plate 600 reaches the origin (S800).

If the control unit 800 determines that the bottom of the shaping plate 600 has not reached the origin A due to the electric signal input from the force sensor 700 in operation S900, The operation for confirming whether the electric signal input from the force sensor 700 is a predetermined value is performed again during each falling period.

On the other hand, when the control unit 800 determines that the bottom of the shaping plate 600 reaches the origin A due to the electric signal inputted from the force sensor 700, the control unit 800 controls the driving unit 500 The movement of the horizontal support 400 is stopped and the light source 200, the driving unit 500 and the like are controlled so that the output operation of the three-dimensional structure can start at the position.

Although the disclosed method and apparatus have been described with reference to the embodiments shown in the drawings for illustrative purposes, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. I will understand that. Accordingly, the true scope of protection of the disclosed technology should be determined by the appended claims.

100: Resin storage part
200: Light source
300: upright support
400: horizontal support
410:
420: rear fixing portion
500:
600: plastic plate
700: Force sensor
710: Beam-shaped structure
720: piezoresistive layer
800:

Claims (7)

A resin storage part for storing the photo-cured resin and having a transparent material at the bottom;
A light source for irradiating light to a lower portion of the resin reservoir;
An upstanding support formed vertically;
A horizontal support cantileverably supported on the upright support;
A driving unit for vertically moving the horizontal support;
A shaping plate coupled to the horizontal support and arranged to move up and down on the resin reservoir and having a three-dimensional structure formed thereunder;
A force sensor for measuring a force applied to the horizontal support; And
And a control unit for controlling the light source and the driving unit corresponding to the molding region of the three-dimensional structure,
Wherein the control unit controls the driving unit such that the shaping plate is disposed at an origin in accordance with a force measured by the force sensor at the start of the output of the three-
The horizontal support includes:
A front flow unit that is a housing coupled to the molding plate; And
And a rear fixing part, which is a housing separated from the front moving part and fixed to the upright support body,
The force sensor generates an electric signal corresponding to a force applied to the front fluid unit, outputs the generated electric signal to the control unit,
The above-
A beam-type structure having one end fixed in the front flow portion and the other end fixed in the rear fixing portion and deformed by a contact force; And
And a piezoresistive layer for sensing the deformation of the beam-like structure and generating the electric signal,
The beam-like structure is deformed in the direction of gravitational acceleration,
The control unit determines whether or not the shaping plate is attached to the front flow section and whether the three-dimensional structure is attached to the lower portion of the shaping plate in correspondence with the degree of deformation of the beam- Dimensional printer.
delete delete The method according to claim 1,
Wherein the control unit includes a shaping plate origin point adjusting device for determining whether the shaping plate is mounted by the electric signal.
The method according to claim 1,
Wherein the control unit includes a shaping plate origin point adjusting device for determining whether or not the three-dimensional structure attached to the shaping plate is separated by the electrical signal.
The method according to claim 1,
The control unit includes a first step of raising the shaping plate to the uppermost position at the start of the output of the three-dimensional structure, a second step of lowering the shaping plate to a predetermined position below the uppermost part and above the origin, And a third step of lowering the shaping plate to the origin, thereby controlling the driving unit,
And the descending speed of the second step exceeds the descending speed of the third step.
The method of claim 6,
Wherein the control unit controls the drive unit so that the forming plate is intermittently lowered by a predetermined height according to a stepwise descent method in the third step.

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