CN214236288U - Continuous powder feeding mechanism of 3D printer head - Google Patents
Continuous powder feeding mechanism of 3D printer head Download PDFInfo
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- CN214236288U CN214236288U CN202022039818.8U CN202022039818U CN214236288U CN 214236288 U CN214236288 U CN 214236288U CN 202022039818 U CN202022039818 U CN 202022039818U CN 214236288 U CN214236288 U CN 214236288U
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Abstract
The utility model discloses a continuous powder feeding mechanism of a 3D printer head, which is provided with a rotating main shaft arranged in a storage bin, a motor connected with the rotating main shaft, and a reverse spiral loose powder stirring shifting fork, a reverse spiral loose powder shifting fork, a powder feeding shifting fork and a fine powder feeding spring which are arranged on the rotating main shaft from top to bottom; the motor drives the rotating main shaft to rotate, the rotating main shaft drives the reverse spiral loose powder stirring shifting fork, the reverse spiral loose powder shifting fork and the powder feeding shifting fork to stir the metal powder in the storage bin to form a dynamic metal powder fine streamline, and the rotating main shaft drives the fine powder feeding spring to rotate and push the metal powder to send out the metal powder fine streamline; the utility model can change the static powder in the bin into a metal powder streamline which continuously flows, has controllable flow and flow speed, stable volume content of the metal powder and fine diameter; the device can accurately scan and spread powder in the effective section range of the part graph, and improves the precision of a 3D printed product.
Description
Technical Field
The utility model relates to a 3D prints the field, especially indicates a 3D printer head's continuous powder feeding mechanism.
Background
In recent years, 3D printing technology has been rapidly developed, and 3D printing technology has played a great role in various manufacturing fields; for example, in the aerospace field: manufacturing an integral worm wheel blade, a high-temperature high-speed spray pipe and the like, and in the medical field: manufacturing artificial joints, teeth, integral ribs of the thoracic cavity and the like, manufacturing various complex parts in the field of precision manufacturing, and in the field of art: the method can be used for manufacturing human statues and the like without exceeding the conventional method; the additive raw materials used in the 3D printing manufacturing technology can be mainly divided into a filamentous additive and a powder (such as metal powder and ceramic powder) additive; the disadvantage of using filiform material such as plastic wire or low melting point metal wire as additive material is that the cost for manufacturing the wire material itself is very high, and some metals are difficult to be made into various thin wire materials; therefore, at present, metal powder additive is adopted for high-melting-point metal 3D printing; widely used in 3D printing technology for metal powder additive are powder bed laser selective sintering (SLS) and Binder Jet Sintering (BJS).
The binder is sprayed and sintered, namely metal powder slurry is prepared from metal powder and organic quick-setting plastic liquid, the metal powder slurry is put into a bin of a 3D printer head, the metal powder slurry is extruded out from the bin through a needle tube small hole under the pushing of gas pressure or a spiral push rod or a piston, and the scanning, stacking and quick-setting molding processes of part parisons are completed simultaneously; the function of the 3D printing head is only the task of continuously pushing out the metal powder slurry paste line from the small hole of the needle tube, and then the processes of drying, degreasing and sintering of the plastic blank are practically completely the same as the processes of the existing injection molding product; however, this practice has the disadvantage that the volume content of metal in the slurry is not stable, and in particular, when passing through the small orifice of the needle tube of the extrusion port of the silo, the metal content in the extruded slurry is further reduced; and large parts cannot be prepared, and the residual porosity of the sintered product is high, resulting in low relative density and low strength.
In view of this, the present inventors have made extensive conception on the defects and inconveniences caused by the imperfect design of the powder feeding structure of the 3D printer head, and have developed and designed the present application by actively researching, improving and trying on the defects and inconveniences.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a continuous powder feeding mechanism of a 3D printer head, which can change static powder in a storage bin into a metal powder streamline with continuous flow, controllable flow and flow speed, stable volume content of metal powder and fine diameter; the device can accurately scan and spread powder in the effective section range of the part graph, and improves the precision of a 3D printed product.
In order to achieve the above purpose, the solution of the present invention is:
a continuous powder feeding mechanism of a 3D printer head is provided with a rotating main shaft arranged in a storage bin, a motor connected with the rotating main shaft, and a reverse spiral loose powder stirring shifting fork, a reverse spiral loose powder shifting fork, a powder feeding shifting fork and a fine powder feeding spring which are arranged on the rotating main shaft from top to bottom; the motor drive drives the rotating main shaft to rotate, the rotating main shaft drives the reverse spiral loose powder stirring shifting fork, the reverse spiral loose powder shifting fork and the powder feeding shifting fork to stir metal powder in the storage bin to form a dynamic metal powder fine streamline, and the rotating main shaft drives the fine powder feeding spring to rotate and push the metal powder to send out the metal powder fine streamline.
The reverse spiral pine powder stirring shifting fork, the reverse spiral pine powder shifting fork and the powder feeding shifting fork are made of steel wires in a filamentous spiral state.
The diameter of the reverse spiral pine powder stirring fork is 0.3-0.4mm, and the reverse spiral pine powder stirring fork is provided with two screw pitches; and the wire diameters of the powder feeding shifting fork and the reverse spiral powder loosening shifting fork are 0.15-0.25 mm.
The fine powder feeding spring is made of cold-processed and hardened platinum wires, tungsten wires or tungsten-rhenium wires.
The parameters of the fine powder feeding spring are calculated and determined according to the following formula,
d＝3.8do+0.12，
D-d≥δ≥0.12，
h≥1.2d，
where D is the outer diameter of the fine powder feeding spring, do is the wire diameter of the fine powder feeding spring, D is the inner diameter of the needle cannula, δ is the rotational clearance of the fine powder feeding spring within the needle cannula, and h is the pitch of the fine powder feeding spring.
The pitch of the fine powder feeding spring is greater than or equal to 8 times of the maximum particle size in the powder.
The lower end of the rotating main shaft is provided with a quick connector base and a quick connector fixedly locked below the quick connector base; the quick joint is provided with a central hole with the center of the bottom surface extending upwards, and the upper end of the fine powder feeding spring is inserted into the central hole; a reinforcing steel wire is arranged in the central hole, penetrates into the inner diameter of the fine powder feeding spring and extends out of the central hole by 2.5-3 mm; and the fine powder feeding spring and the reinforcing steel wire are bonded and fixed in the central hole through water glass.
The inner diameter of the fine powder feeding spring is the same as the diameter of the reinforcing steel wire.
The reverse spiral powder loosening shifting fork and the powder feeding shifting fork are respectively locked on the quick joint through quick joint nuts; the powder feeding shifting fork surrounds the outer ring of the fine powder feeding spring.
The needle tube container is provided with a cylindrical bin section, a conical hopper bin section and a feeding port section, and the needle tube is provided with a connecting section sleeved outside the feeding port section; the reverse spiral loose powder stirring shifting fork is positioned in the cylindrical bin section, the reverse spiral loose powder stirring shifting fork is positioned in the conical hopper bin section, and the powder feeding shifting fork is positioned in the feeding port section; the fine powder feeding spring is positioned in the needle tube, and the lower end of the fine powder feeding spring extends to a discharge hole of the needle tube.
An upper limiting ring and a lower limiting ring which limit the left-right swing of the rotating main shaft are arranged in the needle tube container, the upper limiting ring and the lower limiting ring are provided with a shaft hole for the rotating main shaft to pass through and a plurality of through holes for powder to pass through, and the aperture of the shaft hole is larger than the diameter of the rotating main shaft; the difference between the aperture of the shaft hole and the diameter of the rotating main shaft is less than or equal to 0.05-0.1mm, and the left-right swinging amount of the rotating main shaft during rotation is less than or equal to 0.2 mm.
The rotating main shaft is provided with an upper convex shoulder and a lower convex shoulder which limit the vertical movement of the rotating main shaft, the upper convex shoulder is positioned below the upper limiting ring and has a distance therebetween, and the lower convex shoulder is positioned above the lower limiting ring and has a distance therebetween; the upper limiting ring and the lower limiting ring are arranged at a first interval, the upper convex shoulder and the lower convex shoulder are arranged at a second interval, the difference between the first interval and the second interval is the vertical swing interval of the rotating main shaft, and the vertical swing interval of the rotating main shaft is less than or equal to 2 mm.
The motor is a miniature direct current speed regulating motor.
After the structure is adopted, when the continuous powder feeding mechanism of the 3D printer head of the utility model is used for printing, the motor drives the rotating main shaft to rotate, the rotating main shaft drives the reverse spiral loose powder stirring shifting fork, the reverse spiral loose powder shifting fork and the powder feeding shifting fork to stir the metal powder in the storage bin from top to bottom, and the static metal powder can be changed into an ultrafine metal powder streamline; the rotating main shaft drives the fine powder feeding spring to rotate and push metal powder, and the metal powder can be rapidly fed out to form a fine gas-free pure metal powder streamline; the utility model discloses powder feeding mechanism can become the powder for continuous flow in succession, flow and velocity of flow controllable, streamline diameter are very thin and stable, and metal powder content is even and the granule can not splash, and the velocity of flow is accurate controllable, carries out accurate scanning, shop's powder in the effective section within range of part figure, and the cooperation is with the 3D print job of laser tracking scanning sintering completion precision part simultaneously, improves the precision that 3D printed the product.
Drawings
FIG. 1 is a schematic sectional view of the continuous powder feeding mechanism of the present invention;
fig. 2 is a schematic sectional view of the continuous powder feeding mechanism of the present invention.
Description of the symbols
Reverse spiral powder stirring shifting fork 32 of rotating main shaft 31
Connecting section 22 of feeding port section 13
Quick-acting coupling base 51 quick-acting coupling 52
Stop ring 54 on quick connector nut 53
Cylindrical slotted fork 43 of cover plate 42
A steel rod deflector rod 44.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
Referring to fig. 1 and 2, the present invention discloses a continuous powder feeding mechanism of a 3D printer head, wherein the continuous powder feeding mechanism 3 has a rotating main shaft 31 disposed in a storage bin, a motor 4 connected to the rotating main shaft 31, and a reverse helical loosening powder stirring fork 32, a reverse helical loosening powder fork 35, a powder feeding fork 33 and a fine powder feeding spring 34 arranged from top to bottom on the rotating main shaft 31; the motor 4 drives the rotating main shaft 31 to rotate, the rotating main shaft 31 drives the reverse spiral loose powder stirring fork 32, the reverse spiral loose powder fork 35 and the powder feeding fork 33 to stir metal powder in the storage bin to form a dynamic metal powder fine streamline, the rotating main shaft 31 drives the fine powder feeding spring 34 to rotate and push the metal powder, and the metal powder fine streamline is sent out.
When the continuous powder feeding mechanism of the 3D printer head of the utility model is used for printing, the motor 4 drives the rotating main shaft 31 to rotate, the rotating main shaft 31 drives the reverse spiral loose powder stirring fork 32, the reverse spiral loose powder fork 35 and the powder feeding fork 33 to stir the metal powder in the storage bin from top to bottom, and the static metal powder can be changed into an ultrafine metal powder streamline; the rotating main shaft 31 drives the fine powder feeding spring 34 to rotate and push metal powder, and the metal powder can be rapidly fed out to form a fine gas-free pure metal powder streamline; the utility model discloses powder feeding mechanism can become the powder for continuous flow in succession, flow and velocity of flow controllable, streamline diameter are very thin and stable, and metal powder content is even and the granule can not splash, and the velocity of flow is accurate controllable, carries out accurate scanning, shop's powder in the effective section within range of part figure, and the cooperation is with the 3D print job of laser tracking scanning sintering completion precision part simultaneously, improves the precision that 3D printed the product.
Reverse spiral pine powder stirring shift fork 32, reverse spiral pine powder shift fork 35 and send powder shift fork 33 to be made by the steel wire that is filamentous spiral state.
The wire diameter of the reverse auger powder stirring shifting fork 32 of the utility model is 0.3-0.4mm, and the reverse auger powder stirring shifting fork 32 is provided with two screw pitches; the filiform reverse spiral loose powder shifting fork 32 only slightly supports metal powder, and particularly solves the problem that the diameter and the flow of a metal powder streamline are unstable due to overlarge supporting effect at high rotating speed; and the wire diameters of the powder feeding shifting fork and the reverse spiral powder loosening shifting fork are 0.15-0.25 mm.
The fine powder feeding spring 34 of the utility model is made of a cold-processed and hardened platinum wire, a tungsten wire or a tungsten-rhenium wire; the materials and the work hardening means can ensure that the fine powder feeding spring 34 can still keep the original various geometric parameters unchanged at a high temperature, thereby ensuring the long-time normal work.
The screw pitch of the fine powder feeding spring 34 of the utility model is more than or equal to 8 times of the maximum particle diameter in the powder; the intermittent powder feeding or the blocking or the twist-off of the fine powder feeding spring 34 during the powder feeding is avoided, and the flow of the metal powder streamline is most stable when the rotation state of the fine powder feeding spring 34 is most stable when the spherical powder is used.
The lower end of the rotating main shaft 31 of the utility model is provided with a quick coupling base 51 and a quick coupling 52 locked below the quick coupling base 51; the quick joint 52 is provided with a central hole 521 extending upwards from the bottom center, and the upper end of the fine powder feeding spring 34 is inserted into the central hole 521; a reinforcing steel wire 341 is arranged in the central hole, and the reinforcing steel wire 341 penetrates into the inner diameter of the fine powder feeding spring 34 and extends out of the central hole 521 by 2.5-3 mm; and the spring inner diameter of the fine powder feeding spring 34 is the same as the diameter of the reinforcing steel wire 341; the fine powder feeding spring 34 and the reinforcing steel wire 341 are fixed in the central hole 521 by bonding with water glass; the upper end of the fine powder feeding spring 34 can be inserted with a reinforcing steel wire 341 with the diameter same as the inner diameter of the fine powder feeding spring 34, then the fine powder feeding spring 34 and the reinforcing steel wire 341 are inserted into the central hole 521 of the quick connector 52 together, and then the fine powder feeding spring and the reinforcing steel wire are bonded and fixed by water glass; and the reinforcing steel wire 341 partially extends out of the central hole 521 by 2.5-3mm, so that the shearing stress at the fine powder feeding spring 34 and the quick coupling 52 can be buffered, the purpose is to reduce the problem that the stress at the fine powder feeding spring 34 and the quick coupling 52 is too concentrated, the problem that the connection part between the fine powder feeding spring 34 and the quick coupling 52 is easy to fatigue fracture and break is thoroughly solved, the service life of the fine powder feeding spring 34 is prolonged, the working life can be longer than 3000 hours, and meanwhile, the mounting, the maintenance and the standard part programmed production are convenient.
The reverse spiral powder loosening shifting fork 35 and the powder feeding shifting fork 33 of the utility model are respectively locked on the quick joint 52 through the quick joint nut 53; the fine powder feeding spring 34, the reverse spiral loose powder stirring fork 32, the reverse spiral loose powder fork 35 and the powder feeding fork 33 are firstly installed on the quick coupling nut 53 and then connected with the quick coupling 52, so that the installation, the maintenance and the programmed production of standard parts are facilitated.
The powder feeding shifting fork 33 of the utility model is surrounded on the outer ring of the fine powder feeding spring 34; when printing, the powder feeding shifting fork 33 and the fine powder feeding spring 34 rotate simultaneously, metal powder can be further stirred, the metal powder flow line is used for feeding powder to continuously flow, and the printing effect is better.
The stock bin of the utility model is provided with a needle tube container 1 and a needle tube 2 which are directly connected, wherein the needle tube container 1 is provided with a cylindrical stock bin section 11, a cone hopper stock bin section 12 and a feeding port section 13, and the needle tube 2 is provided with a connecting section 22 which is sleeved outside the feeding port section 13; the reverse auger powder stirring fork 32 is positioned on the cylindrical bin section 11, the reverse auger powder stirring fork 35 is positioned on the cone hopper bin section 12, and the powder feeding fork 33 is positioned on the feeding port section 13; wherein, a thread-shaped reverse spiral powder loosening shifting fork 35 is added on the cone hopper material bin section 12 of the needle tube container 1, and a powder loosening shifting fork 33 is arranged on the feeding port section 13, so that the phenomenon of a vertical hollow shaft easily generated in the powder layer of the cone hopper material bin section 12 is eliminated, and the function of directly and continuously supplying powder is ensured; the fine powder feeding spring 34 is positioned in the needle tube 2, and the lower end of the fine powder feeding spring 34 extends to the discharge hole 21 of the needle tube 2; the fine powder feeding spring 34 rotates and shakes, so that the metal powder can be kept in a dynamic flowing state before being fed out from the discharge port 21, the streamline of the metal powder continuously flows, and the printing effect is better.
The volume of the needle tube container 1 of the utility model is 10-20 cc.
The inner diameter of the needle tube 2 of the utility model is 0.5-0.7mm, and the diameter of the fine streamline of the metal powder is 0.5-0.7 mm.
The outer diameter of the needle tube 2 of the utility model is 1.5-1.7 mm.
The needle tube 2 of the utility model is made of refractory ceramic material; and the needle tube 2 adopts Al2O3Or ZrO2The refractory ceramic material is prepared; can ensure that the metal powder in the needle tube is not sintered or melted when the laser beam is heated at high temperature.
The inner diameter of the needle tube 2 of the utility model is one of phi 0.5 plus or minus 0.01mm, phi 0.6 plus or minus 0.01mm or phi 0.7 plus or minus 0.01 mm.
The needle tube container 1 of the utility model is internally provided with an upper limit ring 54 and a lower limit ring 55 which limit the horizontal swing of the rotating main shaft 31, the upper limit ring 54 and the lower limit ring 55 are provided with a shaft hole 56 for the rotating main shaft 31 to pass through and a plurality of through holes 57 for the metal powder to pass through, and the aperture of the shaft hole 56 is larger than the diameter of the rotating main shaft 31; the diameter difference between the aperture of the shaft hole 56 and the diameter of the rotating main shaft 31 is less than or equal to 0.05-0.1mm, and the left-right swinging amount of the rotating main shaft 31 during rotation is less than or equal to 0.2 mm; because the rotating main shaft 31 can generate the left-right swinging and the up-down movement along the axial line when rotating, the rotating stability and the service life of the fine powder feeding spring 34 in the needle tube 2 are seriously influenced, an upper limit ring 54 and a lower limit ring 55 are arranged on the rotating main shaft 31 of the needle tube container 1, and shaft holes 56 are arranged on the upper limit ring 54 and the lower limit ring 55 to limit the left-right swinging amount of the rotating main shaft 31, thereby improving the rotating stability and the service life of the fine powder feeding spring 34; five circular through holes 57 for powder leakage are additionally formed outside the shaft holes of the upper limiting ring 54 and the lower limiting ring 55; to facilitate the passage of the metal powder.
The utility model discloses a be provided with on the rotatory main shaft 31 and restrict the rotatory main shaft 31 upper shoulder 58 and lower shoulder 59 that moves from top to bottom, upper shoulder 58 is located upper limit ring 54 below and has the interval between the two, lower shoulder 59 is located lower limit ring 55 above and has the interval between the two; a first distance is formed between the upper limiting ring 54 and the lower limiting ring 55, a second distance is formed between the upper shoulder 58 and the lower shoulder 59, the difference between the first distance and the second distance is the vertical swing distance of the rotating main shaft, and the vertical swing distance of the rotating main shaft is less than or equal to 2 mm; when the rotating main shaft 31 rotates, the upper and lower serial momentum of the rotating main shaft 31 is defined by the difference Δ H between the distance H between the upper limit ring and the lower limit ring and the distance R between the upper shoulder and the lower shoulder being H-R; when the rotating main shaft 31 is strung upward by the maximum amount, the upper shoulder 58 abuts against the upper limit ring 54; the lower shoulder 59 abuts the lower limit ring 55 when the rotating spindle 31 is strung down by the maximum amount; the vertical movement of the rotating main shaft 31 is controlled in a safe area with the delta H less than or equal to 2mm, the rotating main shaft rotates more stably, the rotating stability of the fine powder feeding spring 34 is improved, and the service life of the fine powder feeding spring is prolonged.
The utility model discloses an output shaft 41 of motor 4 inserts in the upper shed of needle tubing container 1, and sets up a lid and closes needle tubing container 1's upper shed's apron 42, connect through quick-operation joint between output shaft 41 and the rotatory main shaft 31.
The output shaft 41 of the utility model is provided with a cylindrical slot type shifting fork 43, and the cylindrical slot type shifting fork 43 is fixed on the output shaft 41 through a steel bar shifting lever 44; the rotating main shaft can be quickly connected with the speed regulating motor shaft through simple up-down insertion; before the motor is not installed, powder can be loaded from the upper opening of the needle tube container, so that the powder is conveniently loaded; the device is not afraid of dust interference during installation and disassembly, and has low cost and good practicability.
The needle tube container 1 and the needle tube 2 of the utility model are connected in a threaded way; the threaded connection is provided for ease of installation, maintenance or replacement of the fine powder feed spring 34.
The motor is a miniature direct current speed regulation motor, and the motor specification is DC.12v.0-120 week/minute or DC.12v, 0-180 week/minute.
The parameters of the fine powder feeding spring of the utility model are calculated and determined according to the following formula,
d＝3.8do+0.12(mm)……(1)，
D-d≥δ≥0.12(mm)……(2)，
h≥1.2d(mm)……(3)，
here, D is the outer diameter (mm) of the fine powder feeding spring, do is the wire diameter (mm) of the fine powder feeding spring, D is the inner diameter (mm) of the needle cannula, δ is the rotational clearance (mm) of the fine powder feeding spring in the needle cannula, and h is the screw pitch (mm) of the fine powder feeding spring;
the parameters of the fine powder feeding spring are to ensure the rotating balance condition of the spring; during the design, manufacture and installation process, any parameter change can cause the fine powder feeding spring to be incapable of working normally and to be stuck or broken in severe cases.
The metal powder flow Q (g/min) of the needle tube of the utility model is determined according to the following formula, wherein Q is k.pi/4. D2·h·ρ·N……(4)；
Here, Q is the flow rate of the metal powder of the needle cannula (g/min), N is the rotation speed of the fine powder feeding spring (cycle/min), k is the powder acceleration coefficient, increasing as the number of revolutions N increases; ρ is the bulk density (g/cm) of the metal powder3) D is the inside diameter (cm) of the needle cannula, and h is the pitch (cm) of the fine powder feeding spring.
The utility model discloses a syringe needle pipe total length is including meticulous streamline water conservancy diversion length and first installation length, meticulous powder feeding spring's total length is including meticulous streamline water conservancy diversion length and second installation length.
The fine streamline diversion length of the utility model is 18mm, the first installation length is 5mm, and the total length of the needle tube is 23 mm; the second installation length is 15mm, and the total length of the fine powder feeding spring is 33 mm.
Example 1: designing a metal powder streamline printer head device; wherein: the diameter D of the metal streamline is 0.7 mm-0.07 cm, and the length of the diversion pipe is 18 mm; use ofSpherical metal titanium powder (-200 meshes) metal powder apparent density rho is 2.54g/cm3And the unit weight Wo of the 3D printed part is 6g, the unit finishing time is 15-20 minutes, and 8 parts can be made by one-time powder filling.
1. The utility model discloses a parameter calculation of meticulous powder feeding spring is as follows:
(1) the outer diameter D of the fine powder feeding spring is represented by the formula D-D ≥ delta 0.12(mm) … … (2),
d is 0.7-0.12 is 0.58 (mm);
(2) the wire diameter do of the fine powder feeding spring is represented by the formula d of 3.8do +0.12(mm) … … (1),
do is 0.121 (mm);
wherein, the DO is 0.11-0.12 (mm);
(3) the screw pitch h of the fine powder feeding spring; represented by the formula h is more than or equal to 1.2d (mm) … … (3),
it is known that h is 1.2 × 0.58 ≈ 0.696(mm) ≈ 0.7(mm) ≈ 0.07 cm;
(4) the length L1 of the fine powder feeding spring is 18 +. DELTA.L 1 is 18+15 is 33 (mm);
wherein: delta L1 is the installation length of the fine powder feeding spring, and is slightly 15 mm;
2. flow guide length parameter of the needle tube:
the inner diameter of the needle tube, namely the diameter D1 of the metal streamline is 0.7 mm;
the outer diameter D2 of the needle tube is 0.7+1 is 1.7 (mm);
the guide length L2 of the needle tube is L1+ Delta L2 is 18+5 is 23 mm;
wherein, the Delta L2 is the installation length of the needle tube, which is a little 5 mm.
3. The utility model discloses a metal powder flow Q (g/minute) of syringe needle pipe calculates as follows: q ═ k π/4 · D2·h·ρ·N……(4)；
Wherein, the metal powder of the utility model is spherical metal titanium powder with the grain diameter of-200 meshes, and rho is 2.54 (g/cm)3) (ii) a Substituting the parameters D ═ 0.07(cm) and h ═ 0.07(cm), K ═ 8, and when N ═ 80 cycles/min, the metal powder flow rate Q ═ 8 · pi/4 · (0.07)20.07 · 2.54 · 80 ═ 0.438 (g/min).
Or, the bookThe metal powder is spherical metal titanium powder with the grain diameter of-200 meshes, and rho is 2.54 (g/cm)3) (ii) a Substituting the parameters D ═ 0.07(cm) and h ═ 0.07(cm), K ═ 8, and when N ═ 100 cycles/min, the metal powder flow rate Q ═ 8 · pi/4 · (0.07)20.07 · 2.54 · 100 ═ 0.547 (g/min).
4. The time required for the 3D printer head to print a single part is calculated and determined according to the following formula, where t is W/Q … … (5);
t is the time required to print a single part, W is the weight of a single part, and Q is the metal powder flow rate (g/min).
The utility model discloses when single part weight W is 6 grams, the time t that prints a part is 13.7 (minutes) or t is 6 grams/0.547 (g/minute) 10.97 (minutes).
5. The effective volume of the syringe container of the present invention is determined by calculation according to the following formula, wherein V is w.n/ρ (cm)3)……(6)；
Here, V is the effective volume (cm) of the syringe container3) W is the weight of a single part (g), n is the number of parts in the syringe container that the metal powder can be printed on, and ρ is the bulk density of the metal powder (g/cm)3)。
The utility model discloses a 3D printer head is once adorned powder printable 8 parts (n is 8), and needle tubing container's effective volume V is 6 8/2.54 is 18.897cm3＝20cm3。
The diameter of the needle tube container of the utility model is phi 20mm (S is 3.14 cm)2) And then the height H is 20cm3/3.14cm2＝6.37cm。
When the utility model needs the metal powder streamline printing with the major diameter of phi 1-phi 1.5mm, the needle tube cylinder body only needs to be enlarged when large-scale part products are printed quickly; however, the design of various parameters of the fine powder feeding spring and parameters such as the inner diameter D of the needle tube and the like still needs to be strictly carried out according to the formulas (1), (2) and (3).
The utility model discloses a send powder mechanism to be applied to on the 3D printer device, and work under vacuum state, perhaps work under protective gas (gas such as Ar, He or N), nevertheless do not need gas transport powder.
The utility model discloses a send whitewashed mechanism in succession to be applied to printing device, printing device is when printing the use, and the metal powder granule flows out in the syringe needle pipe that the diameter is very tiny, forms meticulous powder streamline and solves among the 3D printing technique and directly spread the powder with the meticulous streamline scanning of metal powder on the effective section of part and replace the current powder bed large tracts of land (containing invalid section) to spread the difficult problem of powder blindly. The flow of the fine powder streamline is stable and different from the powder streamline conveyed by airflow, no airflow interference exists in the scanning powder paving process, the diameter of the streamline is stable, metal powder particles cannot splash, and the flow rate is accurate and controllable; the scanning track of the metal powder streamline is not interrupted when the scanning moving speed is 40 mm/s; the printer head is arranged on a conventional three-dimensional cold printing device, and fine pure metal powder streamlines continuously generated by the printer head are utilized to accurately scan and spread powder in the effective section range of a part graph; fine scanning the metal powder streamline layer by layer strictly according to the pattern range of the section of the part, spreading powder in a program-controlled manner, and filling; meanwhile, laser beams (or electron beams) are configured in the process that the metal powder is sent out from the needle tube and reaches the surface of the part, the part is quickly tracked and heated, the metal powder area which is scanned and covered is quickly sintered or melted, and finally, the fine and complex metal and alloy parts can be manufactured; the printing device is particularly suitable for manufacturing metal products with fine structures under vacuum conditions.
The above embodiments and drawings do not limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be considered as departing from the scope of the present invention.
Claims (13)
1. The utility model provides a 3D printer head's continuous powder feeding mechanism which characterized in that: the continuous powder feeding mechanism is provided with a rotating main shaft arranged in the storage bin, a motor connected with the rotating main shaft, and a reverse spiral loose powder stirring shifting fork, a reverse spiral loose powder shifting fork, a powder feeding shifting fork and a fine powder feeding spring which are arranged on the rotating main shaft from top to bottom; the motor drive drives the rotating main shaft to rotate, the rotating main shaft drives the reverse spiral loose powder stirring shifting fork, the reverse spiral loose powder shifting fork and the powder feeding shifting fork to stir metal powder in the storage bin to form a dynamic metal powder fine streamline, and the rotating main shaft drives the fine powder feeding spring to rotate and push the metal powder to send out the metal powder fine streamline.
2. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the reverse spiral pine powder stirring shifting fork, the reverse spiral pine powder shifting fork and the powder feeding shifting fork are made of steel wires in a filamentous spiral state.
3. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 2, wherein: the diameter of the reverse spiral pine powder stirring fork is 0.3-0.4mm, and the reverse spiral pine powder stirring fork is provided with two screw pitches; and the wire diameters of the powder feeding shifting fork and the reverse spiral powder loosening shifting fork are 0.15-0.25 mm.
4. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the fine powder feeding spring is made of cold-processed and hardened platinum wires, tungsten wires or tungsten-rhenium wires.
5. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the parameters of the fine powder feeding spring are calculated and determined according to the following formula,
d＝3.8do+0.12，
D-d≥δ≥0.12，
h≥1.2d，
where D is the outer diameter of the fine powder feeding spring, do is the wire diameter of the fine powder feeding spring, D is the inner diameter of the needle cannula, δ is the rotational clearance of the fine powder feeding spring within the needle cannula, and h is the pitch of the fine powder feeding spring.
6. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the pitch of the fine powder feeding spring is greater than or equal to 8 times of the maximum particle size in the powder.
7. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the lower end of the rotating main shaft is provided with a quick connector base and a quick connector fixedly locked below the quick connector base; the quick joint is provided with a central hole with the center of the bottom surface extending upwards, and the upper end of the fine powder feeding spring is inserted into the central hole; a reinforcing steel wire is arranged in the central hole, penetrates into the inner diameter of the fine powder feeding spring and extends out of the central hole by 2.5-3 mm; and the fine powder feeding spring and the reinforcing steel wire are bonded and fixed in the central hole through water glass.
8. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 7, wherein: the inner diameter of the fine powder feeding spring is the same as the diameter of the reinforcing steel wire.
9. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 7, wherein: the reverse spiral powder loosening shifting fork and the powder feeding shifting fork are respectively locked on the quick joint through quick joint nuts; the powder feeding shifting fork surrounds the outer ring of the fine powder feeding spring.
10. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the needle tube container is provided with a cylindrical bin section, a conical hopper bin section and a feeding port section, and the needle tube is provided with a connecting section sleeved outside the feeding port section; the reverse spiral loose powder stirring shifting fork is positioned in the cylindrical bin section, the reverse spiral loose powder stirring shifting fork is positioned in the conical hopper bin section, and the powder feeding shifting fork is positioned in the feeding port section; the fine powder feeding spring is positioned in the needle tube, and the lower end of the fine powder feeding spring extends to a discharge hole of the needle tube.
11. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 10, wherein: an upper limiting ring and a lower limiting ring which limit the left-right swing of the rotating main shaft are arranged in the needle tube container, the upper limiting ring and the lower limiting ring are provided with a shaft hole for the rotating main shaft to pass through and a plurality of through holes for powder to pass through, and the aperture of the shaft hole is larger than the diameter of the rotating main shaft; the difference between the aperture of the shaft hole and the diameter of the rotating main shaft is less than or equal to 0.05-0.1mm, and the left-right swinging amount of the rotating main shaft during rotation is less than or equal to 0.2 mm.
12. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 11, wherein: the rotating main shaft is provided with an upper convex shoulder and a lower convex shoulder which limit the vertical movement of the rotating main shaft, the upper convex shoulder is positioned below the upper limiting ring and has a distance therebetween, and the lower convex shoulder is positioned above the lower limiting ring and has a distance therebetween; the upper limiting ring and the lower limiting ring are arranged at a first interval, the upper convex shoulder and the lower convex shoulder are arranged at a second interval, the difference between the first interval and the second interval is the vertical swing interval of the rotating main shaft, and the vertical swing interval of the rotating main shaft is less than or equal to 2 mm.
13. The continuous powder feeding mechanism of a 3D printer head as claimed in claim 1, wherein: the motor is a miniature direct current speed regulating motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022039818.8U CN214236288U (en) | 2020-09-17 | 2020-09-17 | Continuous powder feeding mechanism of 3D printer head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022039818.8U CN214236288U (en) | 2020-09-17 | 2020-09-17 | Continuous powder feeding mechanism of 3D printer head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115446318A (en) * | 2022-08-25 | 2022-12-09 | 哈尔滨工业大学（威海） | Plasticizing recovery device and method for metal scraps |
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- 2020-09-17 CN CN202022039818.8U patent/CN214236288U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115446318A (en) * | 2022-08-25 | 2022-12-09 | 哈尔滨工业大学（威海） | Plasticizing recovery device and method for metal scraps |
| CN115446318B (en) * | 2022-08-25 | 2024-03-12 | 哈尔滨工业大学（威海） | Plasticizing recovery device and method for metal scraps |
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