CN104669627A - Three-dimensional printer - Google Patents

Abstract

The invention relates to a fused deposition type three-dimensional printer. A heating wire is arranged on a printer body; the heating wire is contained on the body during printing, so that movement of a tray is not hindered; the heating wire moves relative to the tray after the printing operation is ended; and a model on the tray is cut away and is separated from the tray. The printer also can comprise a base, wherein the body is arranged on the base and can rotate around a base mounting shaft, so that the tray is not leveled, and the Z axis of the model is inclined during printing. The printer is relatively low in power and mute and saves electricity; the model is stable during the printing, and one-step molding is conveniently realized; and moreover, the supported printing is greatly reduced, the printing time is shortened, the efficiency is improved, and the cost is saved.

Description

Three-dimensional printer

Technical field

The present invention relates to a kind of rapid molding device, particularly a kind of fusion sediment type three-dimensional printer.

Background technology

FDM(Fused Deposition Modeling) Fused Deposition Modeling technique succeeded in developing in 1988 by American scholar Scott Crump.The material of FDM is generally thermoplastic, as wax, ABS, nylon etc.With thread feed.Material in shower nozzle by heat fused.Shower nozzle is along part section profile and fill orbiting motion, is extruded by the material of fusing, material quick solidification simultaneously, and with the condensation of materials of surrounding.On market, main flow FDM printer brand is as MakerBot, Ultimaker, reprap etc.There are two urgent need to solve the problems at present in this kind of printer.

1. the contradiction of pallet: wish during printing that pallet firmly can cling model, but after finishing, wish that model can depart from from pallet easily.In the face of this conflicting requirements, common way be print before to spreading glue on pallet; Adopt electric heating tray (being commonly called as hott bed) besides, during printing, heating strengthens viscous force, and after finishing, cooling is convenient to take off.Shortcoming is clearly: also have to heat whole pallet even if print a clasp, power increases a few hectowatt, and radiator fan brings annoying noise.

Existing pallet also has a problem to be exactly viscous force difference, easy alice.Such as print the model of an old hen, hen usually cannot be allowed to stand on pallet, because be only difficult to cement pallet with that contact surface of shank, easily fall.It must be sliced into halves, section contact pallet prints, and prepare one bottle of glue subsequently again and bond, and hen must accept a lift face.

2. the support of burden: the model such as printing the happy drum of only one China, in order to prevent drum surface from sinking, must print a large amount of support under drum surface, to reduce the spacing every empty wire drawing; Not only time-consumingly take material, after finishing, also need careful removal to support (closed inner chamber cannot remove support).There is no the technology directly solving this difficult problem at present, two printhead technology maybe can alleviate expense material problem (a printhead prints model, another printhead uses cheap material to print support specially).

Summary of the invention

The object of this case solves above-mentioned 2 difficult problems exactly, and we have broken conventional art prejudice, do things creatively.The inertial thinking of people when resolving contradiction problem always therefrom seeking balance point, does a compromise.The such as contradictory problems of above-mentioned pallet, existing various solution (frosted glass, hott bed, masking tape etc.) is like this.

Solve the problem of pallet contradiction, we adopt heating wire cut, and that is pallet can select rough surface as far as possible, and viscous force is large, even directly use plastic pallet sticks together by model and pallet, cuts down at the end of printing with heating wire.Like this then model and pallet viscous force significantly improves, and when printing above-mentioned old hen model, hen can be allowed to stand on the printing of pallet last time, even if the model of standing on one foot as the cock does also can once print.

Reduce the problem that burden supports, we take to allow the turnover scheme of printer.Various printer all allows pallet maintenance level, and each aspect that is printed is all upwards superposing along gravity vertical of level: this is a kind of inertial thinking.We ask in reply oneself, can not pallet is out-of-level just be printed? must aspect upwards superpose along gravity vertical? downward superposition or sidewards, sideling superposition cannot? all be fine obviously! Than middle national music drum model described above, when printing drum surface, make pallet out-of-level and be perpendicular to gravity vertical, so just can not print support, directly every empty wire drawing, and effectively avoiding drum surface to cave in.And above-mentioned employing heating wire solves the scheme of pallet contradiction, significantly add the viscous force of pallet to model, scheme has made place mat for this reason.

In sum, the innovation is summarised as: on three-dimensional printer, be provided with heating wire, and this heating wire is accommodated on fuselage when printing and does not hinder tray motion part; Heating wire opposing tray motion after printing is complete, slices off the model on pallet and is separated with pallet.This printer also can include base, and fuselage is arranged on base, and fuselage can rotate around floor installation axle, makes pallet out-of-level, thus when making to print, the Z axis of model tilts.

The advantage of the innovation: solve above-mentioned two difficult problems.Make printer power less, more power saving, quieter; Model more stable, one-shot forming of being more convenient for when printing; Significantly reduce the printing of support, shorten time-write interval raising efficiency, cost-saving.

Accompanying drawing explanation

Fig. 1 be printer print complete time figure; Figure when Fig. 2 is printer printing; Side view when Fig. 3 is printer printing.

Detailed description of the invention

Printer as shown in Figure 1, its mainframe box is arranged on above base 4, and mainframe box can rotate around floor installation axle 5, makes pallet 3 no longer level, even can be vertical, or makes model hang upside down.The realization of this rotation, realizes by stepper motor collocation worm-gear toothing, and software controls the suitable angle of electric machine rotation in suitable.In figure 2 is electric heating bows of pallet 3 side, and bowstring 1 is heating wire.This electric heating bow is turned to cabinet side does not hinder printing when printing, and state as shown in Figure 1 at the end of printing, bowstring 1 is parallel with pallet 3, and pallet 3 carries model and moves to bowstring 1, and heating wire just in time embeds between pallet 3 and model, is little by little cut off by model.The opposite side of pallet 3 also has an electric heating to bend, and model is sliced off half in this direction, then moves to opposite cutting residue.

In figure 6 is printheads, and it is arranged on the whippletree with slide rail, and transverse shifting realizes the X-axis of printer, and moving up and down of whippletree, realizes Z axis, and what pallet mobile realized is Y-axis.Printer housing, along the rotation of floor installation axle 5, realizes whole cartesian coordinate XYZ tri-axle on the whole relative to the change of gravity vertical, thus effectively reduces the demand to model support.

Printer the best in figure is applicable long-range extrudes scheme, such as, extruder head is arranged on the end of whippletree, is conducive to the balance of whippletree center of gravity like this, avoids rocking strengthening printing stability.Shown in Fig. 1 is a kind of printer taking pallet transverse shifting to realize Y-axis, as reprap type (being commonly called as gantry framework printer).If that square box printer of picture MakerBot, pallet moves up and down and realizes Z axis, and so the design of electric heating bow just can not be so succinct.Should in contrast, when being designed to cut, pallet is motionless, electric heating bow mobile (such as driving with stepper motor).

When Fig. 2 and Fig. 3 illustrates printing from different perspectives, the state of electric heating bow storage, its one end has rotating shaft to be fixed on cabinet, can be turned to the position not hindering printing around this rotating shaft.And this technology makes the shape differentiation of printer in existing all products, seem a display and have more aesthetic feeling.

Claims (3)

1. a three-dimensional printer, belongs to Fused Deposition Modeling technique, it is characterized in that being provided with heating wire, and this heating wire is accommodated on fuselage when printing and does not hinder tray motion part; Heating wire opposing tray motion after printing is complete, slices off the model on pallet and is separated with pallet.

2. a three-dimensional printer, belong to Fused Deposition Modeling technique, it is characterized in that including base, fuselage is arranged on base, and fuselage can rotate around floor installation axle, makes pallet out-of-level, thus when making to print, the Z axis of model tilts.

3. three-dimensional printer as claimed in claim 1, also comprises feature according to claim 2.