CN114536767A - Modular jumbo size polymer 3D prints aftertreatment device - Google Patents

Abstract

A combined large-size polymer 3D printing post-processing device provided by the present invention includes several heating plates, and the several heating plates are spliced and connected to form a combined frame-shaped structure, and the bottom of the frame-shaped structure is an open end; The invention can realize the instant heat treatment after the printing of the large-sized polymer, and reduce the deformation of the large-sized polymer printing. Freely released, will not receive external squeezing deformation.

Description

A combined large-scale polymer 3D printing post-processing device

technical field

The invention belongs to the field of 3D printing, in particular to a combined large-size polymer 3D printing post-processing device.

Background technique

Fused deposition modeling (FDM) is a widely used polymer 3D printing technology. In this additive manufacturing technology, the plastic polymer is heated and melted in the form of a melt and adhered to a predetermined printing position, and the printed product is finally formed by the melt layer by layer.

During this process, as the molten polymer of the front print layer cools and solidifies on the upper surface of the underlying polymer, shrinkage occurs, but due to the constraints of the hardened structure below, this shrinkage can cause layer-to-layer formation Shear force, or residual stress, can be extremely destructive layer by layer and can cause parts to deform, roll up their edges, or even break away from supports.

Generally, the bonding effect between the printed part and the base plate is improved by mechanical fixing or chemical bonding to suppress the printed part from being separated from the base plate due to the edge rolling. However, when the printed part is removed, the residual stress is not completely released. Under unconstrained conditions, it will still be released slowly, resulting in the deformation of the printed part, and even the printed part will be scrapped if the deformation is serious.

The larger the size of the part, the greater the residual stress. The general treatment method is to remove the constraint and heat treatment at a certain temperature after the printing is completed. However, the printed part will still be partially deformed during the post-processing process in the unconstrained state, resulting in printing. Piece size deviation is large.

In the prior art, the methods used in post-processing the prints are:

1. Most of the existing processing methods for polymer 3D printing focus on how to improve the surface quality, because most of the polymer printing size is small (within the maximum size of 1m), these small-size printing parts are easier to achieve in terms of suppressing deformation, residual stress Small, by leaving a margin before printing, the required surface size and accuracy can be achieved by machining in the later stage;

2. The post-processing method of polymer 3D printing introduced in "A Post-processing Process of 3D Printing Based on FDM Technology" is to make up for the deformation by reserving machining allowance, and at the same time increase the bonding force between the printed part and the substrate during the printing process to inhibit Deformation, the method of direct machining after printing is completed to achieve the required size and surface accuracy. In fact, when the size of the workpiece is relatively large (above 1m size) and the structure is relatively easy to deform, it is often impossible to reserve machining allowances. method to compensate for the deformation;

3. In the prior art, there is also a method of reducing residual stress by heat treatment, but generally the workpiece is removed, or placed in a heating container together with the substrate for post-processing, but when the workpiece is large, it is inconvenient to remove ( Generally, the substrate is fixed), and after it is removed and post-processed in an unconstrained state, it will still deform under the action of residual stress, resulting in poor dimensional accuracy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a combined large-size polymer 3D printing post-processing device, which solves the above-mentioned deficiencies in the prior art.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A combined large-size polymer 3D printing post-processing device provided by the present invention includes a plurality of heating plates, and the plurality of heating plates are spliced and connected to form a combined frame-shaped structure, and the bottom of the frame-shaped structure is an open end; and Removable connection between two adjacent heating plates.

Preferably, two adjacent heating plates are connected by snaps.

Preferably, two adjacent heating plates are connected by snap connection.

Preferably, the heating plate includes an outer plate, and one end surface of the outer plate is provided with a card slot, and a heat preservation plate and a heating ring are sequentially arranged in the card slot from the inside to the outside, and the heating ring faces the inside of the frame structure. side of the cavity.

Preferably, a fan is also installed on the outer plate, the fan is placed between the thermal insulation board and the heating ring, and the wind direction of the fan is toward one side of the heating ring.

Preferably, an air distribution plate is also installed on the outer plate, and the air distribution plate is placed on the outer side of the heating ring.

Preferably, a temperature control probe for measuring the temperature of the inner cavity is installed on the air equalizing plate.

Preferably, the bottom of the frame-shaped structure is provided with a support.

Preferably, the bottom of the frame-shaped structure is provided with a universal wheel.

Compared with the prior art, the beneficial effects of the present invention are:

The invention provides a combined large-size polymer 3D printing post-processing device, which adopts a combinable heating plate to post-process the printed workpiece, the workpiece does not need to be moved, and does not need to be unconstrained, and the stress deformation is minimized. ; And it is easy to assemble and transport, and it can realize the instant heat treatment after the printing of the large-size polymer, reduce the deformation of the large-size polymer print. The residual stress of the printed part can be released freely without external extrusion deformation.

Description of drawings

Fig. 1 is the overall structure schematic diagram of post-processing device;

Fig. 2 is a schematic diagram of a heating plate structure;

Among them, 1, heating plate 2, hasp 3, support 4, universal wheel 1, outer plate 2, insulation plate 3, fan mounting plate 4, fan 5, heating ring 6, air distribution plate 7, temperature control probe.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , a combined large-size polymer 3D printing post-processing device provided by the present invention includes several heating plates 1 , and the several heating plates 1 are spliced and connected to form a combined cube structure; at the same time, Two adjacent heating plates 1 are movably connected through a buckle 2 .

A plurality of supports 3 and universal wheels 4 are evenly distributed on the lower end surface of the cubic structure. A universal wheel 4 is installed at the lower end of the cube, and the splicing block at the lower end of the cube can be moved to any position. After the position is fixed, lower the support 3 to fix the lower end of the cube at the designated position, and then splicing the upper end of the cube.

The heating plate 1 includes an outer plate 11, a heat preservation plate 12, a fan mounting plate 13, a fan 14, a heating ring 15, a uniform air plate 16 and a temperature control probe 17, wherein the outer plate 11 is a The four sides of the plate-like structure are zigzag structures; it is used to realize the snap connection between two adjacent outer plates 11 .

One end surface of the outer plate 11 is provided with a card slot, and a heat preservation plate 12 , a fan mounting plate 13 , a heating ring 15 and an air distribution plate 16 are sequentially arranged in the card slot from the inside to the outside.

The fan mounting plate 13 is provided with a plurality of mounting holes, and the fan 14 is fitted in the mounting holes.

The air equalizing plate 16 includes a plate body, and a plurality of air outlets are opened on the plate body.

A plurality of air outlets are arranged radially from the center, and the apertures increase sequentially from the center to the periphery.

The air outlets on each floor are arranged coaxially.

A temperature control probe 17 for measuring the temperature in the inner cavity of the frame-shaped structure is installed on the air equalizing plate 16 .

The output end of the temperature control probe 17 is connected with a controller, and the output end of the controller is controlled and connected with the heating coil 15 .

When in use,

After the 3D print is printed, keep the original position unchanged, select different numbers of splicing blocks according to the size of the print, and each splicing block is connected by a lock; for example, when the print size is 1300*1300*1300mm, because each The size of the splicing block is 500*500*500mm, and 45 splicing blocks need to be selected to form a 1500*1500*1500mm cube with an open bottom to surround the printed part for annealing treatment.

When the present invention performs post-processing on the printed part, after the polymer material is formed, annealing treatment is performed at a suitable temperature, so that the chain segments can move, so that the molecular chain gradually changes from a curled state to a natural stretched state, and finally achieves elimination of internal effect of stress.

The structure involved in the present invention has the following advantages:

1. A composable heating plate is used to post-process the printed workpiece. The workpiece does not need to be moved or unconstrained, and the stress and deformation are minimized; and the assembly and handling are convenient, which can realize the large-scale polymer printing after the completion of the printing. Instant heat treatment to reduce distortion in large-sized polymer prints.

2. During the post-processing of the printed parts, the combined post-processing device and the printed parts are not constrained by each other, so that the residual stress of the printed parts can be released freely without external extrusion deformation.

3. The heating plate is divided into different specifications, and the optimal size can be freely combined according to the size of the print, reducing the waste of heating space, improving the utilization rate of heat, and reducing unnecessary heat loss.

4. There is a blower device between the inner and outer plates of the heating plate, and the surface of the inner plate has a lattice structure to ensure a more uniform temperature distribution in the surrounding area of the printed workpiece.

5. The bottom of the heating plate is equipped with rollers, which is convenient for the transfer and handling of the heating plate.

Claims (9)

1. A combined large-size polymer 3D printing post-processing device, characterized in that it comprises several heating plates (1), and several heating plates (1) are spliced and connected to form a combined frame structure, the frame type The bottom of the structure is an open end, and two adjacent heating plates (1) are detachably connected. 2 . The combined large-size polymer 3D printing post-processing device according to claim 1 , wherein two adjacent heating plates ( 1 ) are connected by a buckle ( 2 ). 3 . 3. A combined large-size polymer 3D printing post-processing device according to claim 1 or 2, characterized in that two adjacent heating plates (1) are connected by snap connection. 4. A combined large-size polymer 3D printing post-processing device according to claim 1, wherein the heating plate (1) comprises an outer plate (11), and one of the outer plates (11) The end face is provided with a card slot, and a heat preservation plate (12) and a heating ring (15) are sequentially arranged in the card slot from the inside to the outside, and the heating ring (15) faces one side of the inner cavity of the frame structure. 5. A combined large-size polymer 3D printing post-processing device according to claim 4, characterized in that, a fan (14) is also installed on the outer plate (11), and the fan (14) is installed on the outer plate (11). between the heat preservation plate (12) and the heating ring (15), and the wind direction of the fan is toward the side of the heating ring (15). 6. A combined large-size polymer 3D printing post-processing device according to claim 4, characterized in that, a uniform air plate (16) is also installed on the outer plate (11), and the air uniform plate (16) is installed on the outer plate (11). (16) is placed on the outside of the heating ring (15). 7. A combined large-size polymer 3D printing post-processing device according to claim 6, characterized in that, a temperature control probe (17) for measuring the temperature of the inner cavity is installed on the air equalizing plate (16) . 8. A combined large-size polymer 3D printing post-processing device according to claim 1, wherein a support (3) is provided at the bottom of the frame-shaped structure. 9. A combined large-size polymer 3D printing post-processing device according to claim 1, wherein a universal wheel (4) is provided at the bottom of the frame-shaped structure.

Images