CN117207671B - Morphology control device for pneumatic direct-writing printing needle head and application - Google Patents
Morphology control device for pneumatic direct-writing printing needle head and application Download PDFInfo
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Abstract
The invention belongs to the technical field of direct-writing printing, and particularly relates to a morphology control device for a pneumatic direct-writing printing needle head and application thereof; the line height difference of the printed product obtained by printing by using the morphology control device is small, and the prepared printed product has higher precision and better quality; in addition, the appearance control device provided by the invention has the advantages of simple structure, lower preparation cost, convenience in installation, capability of being detachably connected with the direct-writing printing needle head and higher application flexibility.
Description
Technical Field
The invention belongs to the technical field of direct-writing printing, and particularly relates to a morphology control device for a pneumatic direct-writing printing needle head and application.
Background
Ink direct write printing (Direct Ink Writing, DIW) is an emerging high precision additive three-dimensional printing technology that utilizes a controllable nozzle system to precisely eject viscous ink onto a target surface, and then cures the ink by thermal curing or cross-linking, etc., to form a three-dimensional structure. Ink direct-writing printing has shown great application potential in biomedical engineering, micro device manufacturing, aerospace, national defense, display industry and other fields in recent years based on the advantages of the ink direct-writing printing. Specifically, ink direct-write printing has the following advantages: the ink direct-writing printing precision is high, the resolution ratio is high, the structure construction of complex geometric shapes, microstructures and micro-sizes can be realized, the ink direct-writing printing method is widely used for manufacturing complex structures and nano-scale materials, and the quality of the prepared materials is better; the ink direct-writing printing technology can realize high-speed printing, and the application demands of the existing printing market; compared with the traditional ink-jet and laser printing technologies, the ink direct-writing printing technology can use ink more economically and efficiently, so that the use cost of the device is lower; the ink direct writing printing can be used for printing different types of ink, including color ink, fluorescent ink, metal ink and the like, so that the printing application range is extremely wide; the application flexibility is high, and the performance characteristics of the final product of the ink direct-writing printing, such as hardness, elasticity, conductivity and the like, can be adjusted by using different types of inks and printing substrates; in addition, compared with the existing printing technology, the ink direct-writing printing is quite quiet in the running process, and noise interference is not generated.
The discharging modes of the ink in the direct writing printing of the ink mainly comprise pneumatic, mechanical and electromagnetic modes. Pneumatic ink discharge means that ink is extruded into a nozzle or an injector by applying air pressure, and then the extrusion speed and fluidity of the ink are controlled by controlling the magnitude of the air pressure and the position of the nozzle. The mechanical ink discharging is to control the extrusion and flow of the ink by a mechanical device, and a common mechanical ink discharging device is a screw extrusion structure. Electromagnetic ink ejection is the ejection of ink into a nozzle or syringe by electromagnetic force, which typically uses an electromagnetic drive or solenoid valve to control the ink ejection speed and flow. Based on comprehensive consideration of mechanical ink discharge, abrasion of electromagnetic ink discharge, energy consumption and the like, the conventional and widely applied ink direct-writing printing device on the market adopts a pneumatic discharge mode. Pneumatic ink ejection of compact has following advantage: the pneumatic discharging mode can control the flowing speed and the extruding amount of the ink by adjusting the air pressure, so that the accuracy in the printing process is higher; the pneumatic discharging mode has higher adjustability, and the discharging speed and the flow of the ink can be adjusted according to the requirement, so that the ink discharging can be started and stopped immediately, and the optimal printing effect under different printing requirements is met.
Although the pneumatic direct-writing printing has the advantages, in the printing process, since the speed of the movement of the printing needle is smaller than the printing speed of the uniform printing stage when the pneumatic direct-writing printing is performed at the acceleration and deceleration positions of the printing start stage (the stage of gradually accelerating the printing needle to the uniform speed) and the printing end stage (the stage of gradually decelerating the printing needle from the uniform speed to the printing stop stage) and the like, the surface of the printing substrate at the acceleration and deceleration position generates redundant ink accumulation under the condition that the air pressure is kept consistent, and a longer process edge is formed. In order to reduce the length of the process edge as much as possible, improve the utilization rate of the substrate, reduce the frame width of the final printed product and reduce the printing cost, a common solution in practice is a fast switching air method, namely, air pressure is applied to the ink after the air pressure is applied to the ink near the initial position of the acceleration section, and the air pressure is applied to the ink before the air pressure is applied to the ink near the final position of the deceleration section, so that the relative matching of the ink flow and the movement speed of the printing needle is ensured. On the one hand, however, the pneumatic system has hysteresis effect, and when printing at high speed, the direct-writing printing equipment cannot ensure the accurate matching of the ink flow and the moving speed, so that the method cannot well solve the technical problem of the product process side length; on the other hand, frequent switching of the air pressure will result in that the actual feed pressure cannot reach a steady state, so that the line height difference of the obtained printed product is large and not accurate enough.
Disclosure of Invention
The invention aims to provide a morphology control device with high printing precision for a pneumatic direct-writing printing needle head and application, and the morphology control device is realized by the following technical scheme:
the morphology control device for the pneumatic direct-write printing pinhead comprises a first surface and a second surface which are correspondingly arranged, and a mounting hole penetrating through the first surface and the second surface and used for mounting the direct-write printing pinhead; one end of the mounting hole and the first surface form a first placement opening, and the other end of the mounting hole and the second surface form a second placement opening; the morphology control device further comprises a control material assembly, wherein the control material assembly comprises a material sucking slit penetrating through the second surface and a material sucking part in through connection with one end, close to the first surface, of the material sucking slit; and a liquid guide port for guiding the ink on the liquid outlet surface of the direct-writing printing needle head to flow along the material suction slit is formed on one side of the material suction slit close to the second surface, and the diameter of the second placement port is larger than that of the liquid outlet of the direct-writing printing needle head.
The invention provides a brand-new morphology control device which can be arranged on the direct-writing printing needle head, so that the length of a process edge is greatly reduced, excessive waste of ink is avoided, and the printing cost is lower; the line height difference of the printed product obtained by printing by using the morphology control device is small, and the prepared printed product has higher precision and better quality; in addition, the appearance control device provided by the invention has the advantages of simple structure, lower preparation cost, convenience in installation, capability of being detachably connected with the direct-writing printing needle head and higher application flexibility. Specific:
in the technical scheme, the appearance control device is provided with the first surface, the second surface, the mounting holes penetrating through the first surface and the second surface, and the first mounting opening and the second mounting opening matched with the mounting holes, so that convenience is brought to the mounting of the direct-writing printing needle head. In the installation process, the liquid outlet of the direct-writing printing needle head only needs to sequentially penetrate through the first placement opening and the second placement opening and is sleeved in the installation hole.
According to the morphology control device, the liquid guide port, the material sucking slit and the material sucking component which are sequentially communicated with the liquid guide port are arranged on the second surface, and the relation between the second placement port and the liquid outlet of the direct-writing printing needle head is limited, so that the problem that the process side of a printing product is overlong in the prior art can be well solved. Taking the example that the direct-writing printing needle is in the deceleration stage, because the pressure applied to the ink is kept consistent, when the direct-writing printing needle is in the deceleration stage, the ink on the liquid outlet surface of the direct-writing printing needle is continuously accumulated until the ink contacts the liquid guide port, and then the ink is sucked out by the material sucking component along the liquid guide port and the material sucking slit in sequence, at the moment, the surface of the direct-writing printing needle is not remained with the ink, so that the process edge is shortened, and the ink sucked by the material sucking component can be reused. It should be noted that by adjusting the diameter relation between the second placement port and the liquid outlet of the direct-writing printing needle head, the invention can realize that the sucking component is triggered to suck ink only when the ink on the liquid outlet surface of the direct-writing printing needle head is accumulated to a certain amount, thereby effectively avoiding the sucking component from sucking the ink on the liquid outlet surface of the direct-writing printing needle head indiscriminately, and ensuring the quality of printing products at a constant speed section.
Preferably, the suction slit is coaxially arranged with the second mounting port.
In principle, any suction slit capable of realizing the through connection of the liquid guide port and the suction part can meet the suction requirement of the suction part on ink, so that the suction slit can be in the form of one or more holes distributed near the second placement port, or in the form of an arc-shaped suction slit distributed near the second placement port. In the technical scheme, the material sucking slit is an annular material sucking slit which surrounds the second mounting opening and is coaxially arranged with the second mounting opening. By the technical scheme of arranging the annular material sucking slit, on one hand, a larger accommodating space is provided for sucking ink, so that the ink sucking device can be applied to a direct-writing printing needle head with larger ink accumulation; on the other hand, the contact surface between the liquid guide opening and the ink can be increased, so that along with the continuous accumulation of the ink at the liquid outlet of the direct-writing printing needle at the central position, the ink is contacted with the liquid guide openings uniformly distributed around, the ink sucking effect of the material sucking part is better, the residual quantity of the ink at the liquid outlet surface of the direct-writing printing needle is less, and the length of the process edge can be further shortened.
Preferably, the inner side surface of the mounting hole is provided with a temperature control component for controlling the surface temperature of the direct-write printing needle head.
The applicant found that the uniformity of the surface temperature of the direct-write printing needle head not only affects the uniformity of the ink, but also affects the flow rate of ink discharge. According to the technical scheme, the temperature control assembly is arranged on the inner side surface of the mounting hole, so that the phenomenon that the direct-writing printing needle head continuously moves in the printing process and the discharge flow changes due to temperature fluctuation can be avoided, and the accuracy of a printed product obtained after printing is higher.
As a further preference, the temperature control assembly comprises a temperature regulating member and a temperature sensor for determining the surface temperature of the pneumatic direct write printing head.
According to the technical scheme, the temperature regulating part for regulating the temperature of the surface of the direct-writing printing needle head and the temperature sensor for measuring the surface temperature of the pneumatic direct-writing printing needle head are arranged, the floating range of the surface temperature of the direct-writing printing needle head can be narrowed through close fit between the temperature regulating part and the temperature sensor, so that the discharge of the liquid outlet ink of the direct-writing printing needle head is more uniform, and the accuracy of a printed product obtained after printing is higher. In particular, the temperature regulating member may in principle be selected from any device that can regulate the temperature of the surface of the write-through printing needle, such as heating wires, water circulation pipes, peltier etc.
A pneumatic direct write printing needle comprising the topography control device of any one of the above.
Preferably, the pneumatic direct-writing printing needle comprises a printing needle head mounting base and a direct-writing printing needle head arranged on the printing needle head mounting base; a liquid outlet is formed in one end, far away from the printing needle mounting base, of the direct-writing printing needle; along the flowing direction of the liquid outlet ink, the section of the direct-writing printing needle head is continuously reduced.
In the technical scheme, the shape of the direct-write printing needle head applicable to the morphology control device is limited, so that on one hand, the mechanical strength of the direct-write printing needle head is improved on the whole, and the service life of the direct-write printing needle head is longer; on the other hand, when the surface of the direct-writing printing pinhead is provided with the temperature control component, the temperature of the ink in the direct-writing printing pinhead can be further controlled before the ink is extruded, the influence of the temperature of the ink on the flow of the liquid outlet of the direct-writing printing pinhead is reduced, and therefore the precision of a product obtained after printing is higher.
A direct write printing device comprising a pneumatic direct write printing needle as claimed in any one of the preceding claims.
Preferably, the direct-writing printing device further comprises a lifting assembly for driving the pneumatic direct-writing printing needle to move up and down.
The application method of the direct-writing printing equipment comprises the following steps: in the acceleration and deceleration stage of direct-writing printing, the direct-writing printing needle head is lifted, so that the ink on the surface of the direct-writing printing needle head is not contacted with a printing substrate; and opening the material sucking component to suck the ink connected with the liquid guide port along the liquid guide port and the material sucking slit in sequence.
In this technical scheme, through setting up the structure of liquid guiding mouth to and with its matched with raise the method of using of direct-write printing syringe needle, based on the coanda effect, at the in-process of raising the direct-write printing syringe needle, the ink on direct-write printing syringe needle surface will be piled up along liquid guiding mouth constantly, therefore the effect of whole ink absorption is better, and the technology limit is shorter.
The application method of the direct-writing printing equipment comprises the following steps: in the acceleration and deceleration stage of direct-writing printing, closing the feed air pressure; and opening the material sucking component to suck the ink connected with the liquid guide port along the liquid guide port and the material sucking slit in sequence.
Preferably, the method for using the direct-writing printing device further comprises the following steps:
s1, a monitoring probe of a temperature sensor collects temperature data of the surface of a direct-write printing needle head, and the temperature data is uploaded to a controller through a communication module of the temperature sensor;
s2, the controller analyzes the temperature data, and regulates and controls the temperature of the surface of the direct-writing printing needle head by commanding the temperature regulating component to raise and lower according to the analysis result.
Compared with the prior art, the invention has the following beneficial effects:
the invention greatly reduces the length of the process edge and improves the utilization rate of the substrate by providing a brand new shape control device which can be arranged on the direct-writing printing needle head; the line height difference of the printed product obtained by printing by using the morphology control device is small, and the prepared printed product has higher precision and better quality; in addition, the appearance control device provided by the invention has the advantages of simple structure, lower preparation cost, convenience in installation, capability of being detachably connected with the direct-writing printing needle head and higher application flexibility. Specifically, firstly, the morphology control device of the invention provides convenience for the installation of the direct-writing printing needle head by arranging the first surface, the second surface, the installation holes penetrating through the first surface and the second surface, and the first installation opening and the second installation opening matched with the installation holes. Secondly, the morphology control device of the invention can well solve the problem of overlong process side of a printing product in the prior art by arranging the liquid guide port, the material sucking slit and the material sucking part which are sequentially communicated with the liquid guide port and limiting the relation between the second placement port and the liquid outlet of the direct-writing printing needle head on the second surface. And the second setting port is connected with the liquid outlet of the direct-write printing needle head, and the second setting port is connected with the liquid outlet of the direct-write printing needle head. In addition, the temperature control assembly is arranged on the inner side surface of the mounting hole, so that the change of discharge flow caused by temperature fluctuation in the continuous moving printing process of the direct-writing printing needle head can be avoided, and the accuracy of a printed product obtained after printing is higher.
Drawings
For clarity of description of the embodiments, the drawings that follow will be briefly described:
fig. 1 is a cross-sectional view of the topography control device of example 3.
Fig. 2 is a cross-sectional view of the write-through needle of example 4.
Fig. 3 is a print path of the write-through printing apparatus of embodiment 6, in which the white path portion is a raised write-through print pin portion.
Fig. 4 is an enlarged view of the final partial topography of the printed product obtained in example 6.
Fig. 5 is a graph showing line height data at different positions in the effective area of the printed product obtained in example 6.
Fig. 6 is an enlarged view of the final partial topography of the printed product obtained in comparative example 1.
Fig. 7 is a graph of line height data at different positions within the effective area of the printed product obtained in comparative example 1.
The reference numerals are as follows: 1. the first surface, 2, the second surface, 3, the mounting hole, 11, first settling port, 21, the second settling port, 4, accuse material subassembly, 41, inhale the material slit, 42, inhale the material part, 43, the drain mouth, 5, the temperature control subassembly, 51, the temperature regulating part, 52, temperature sensor, 6, printing needle mounting base, 7, direct writing printing needle, 71, the liquid outlet.
Detailed Description
The invention will be further described by way of the following specific examples. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Example 1
The embodiment discloses a morphology controlling means for pneumatic type direct-write printing syringe needle, morphology controlling means includes:
a first surface 1 and a second surface 2 which are correspondingly arranged up and down, and a mounting hole 3 which penetrates through the first surface 1 and the second surface 2 and is used for mounting a direct-writing printing needle 7; one end of the mounting hole 3 forms a first mounting opening 11 with the first surface 1, and the other end of the mounting hole 3 forms a second mounting opening 21 with the second surface 2. The morphology control device of this embodiment provides great convenience for the subsequent installation of the direct-writing printing needle 7 by providing the first surface 1, the second surface 2, the installation hole 3 penetrating the first surface 1 and the second surface 2, and the first installation opening 11 and the second installation opening 21 matched with the installation hole 3. Specifically, in the process of installing the morphology control device, the liquid outlet 71 of the direct-writing printing needle 7 only needs to sequentially pass through the first placement opening 11 and the second placement opening 21, and the morphology control device is sleeved inside the installation hole 3. At this time, the first mounting port 11, the second mounting port 21, and the mounting hole 3 are tightly connected to part or all of the side surfaces of the write-through stylus head 7, and the mounting is completed. Therefore, the device is simple in installation method, structural modification of the pneumatic direct-writing printing needle head 7 is not needed, application flexibility is higher, and overhauling and replacement of the morphology control device are facilitated. In addition, in order to further facilitate the installation, in this embodiment, the outer surface of the morphology control device is in a shape of a truncated cone, and the material is selected from rubber.
In order to suck ink on one end surface of the liquid outlet 71 of the direct-writing printing needle 7, the morphology control device of the present embodiment further includes a control material assembly 4. The material control assembly 4 comprises a material suction slit 41 penetrating through the second surface 2, and a material suction part 42 in through connection with one end of the material suction slit 41 close to the first surface 1; the suction slit 41 is formed with a liquid guide port 43 for guiding ink on one end surface of the liquid outlet 71 of the direct-write head 7 to flow along the suction slit 41 on the side close to the second surface 2. In this embodiment, in order to simplify the internal structure of the morphology control device and reduce the difficulty in preparing the device to a certain extent, the material sucking slit 41 is two holes penetrating through the second surface 2. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct-write printing needle 7 to quickly contact with the liquid guide port 43 during the acceleration and deceleration stage, the length of the process edge is further shortened, and the second surface 2 of the liquid guide port 43, which is connected with the center of the second placement port 21, is higher than the second surface 2, which is close to the center of the second placement port 21.
In addition, when the second surface 2 is relatively close to or even concentric with the liquid outlet 71 of the direct-write head 7, the discharged ink will necessarily touch the second surface 2, especially the liquid guide 43 disposed near the liquid outlet 71. Thus, on the one hand, the ink topography of both the printed constant velocity segment and the acceleration and deceleration segment will be affected; on the other hand, the ink of a normal flow rate is easily sucked out by the suction member 42. Therefore, in order to avoid the material sucking component 42 from sucking the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 indiscriminately, while ensuring the quality of the printed product in the constant speed section, the length of the process edge is shortened, and the printing waste is reduced, in this embodiment, the diameter of the second placement opening 21 is larger than the diameter of the liquid outlet 71 of the direct-writing printing needle, which means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, the material sucking component can be triggered to suck the ink only when the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 is accumulated to a certain amount.
Example 2
The embodiment discloses a morphology controlling means for pneumatic type direct-write printing syringe needle, morphology controlling means includes:
a first surface 1 and a second surface 2 which are correspondingly arranged up and down, and a mounting hole 3 which penetrates through the first surface 1 and the second surface 2 and is used for mounting a direct-writing printing needle 7; one end of the mounting hole 3 forms a first mounting opening 11 with the first surface 1, and the other end of the mounting hole 3 forms a second mounting opening 21 with the second surface 2. The morphology control device of this embodiment provides great convenience for the subsequent installation of the direct-writing printing needle 7 by providing the first surface 1, the second surface 2, the installation hole 3 penetrating the first surface 1 and the second surface 2, and the first installation opening 11 and the second installation opening 21 matched with the installation hole 3. Specifically, in the process of installing the morphology control device, the liquid outlet 71 of the direct-writing printing needle 7 only needs to sequentially pass through the first placement opening 11 and the second placement opening 21, and the morphology control device is sleeved inside the installation hole 3. At this time, the first mounting port 11, the second mounting port 21, and the mounting hole 3 are tightly connected to part or all of the side surfaces of the write-through stylus head 7, and the mounting is completed. Therefore, the device is simple in installation method, structural modification of the pneumatic direct-writing printing needle head 7 is not needed, application flexibility is higher, and overhauling and replacement of the morphology control device are facilitated. In addition, in this embodiment, the outer surface of the morphology control device has a cuboid shape, and the material is selected from aluminum.
In order to suck ink on one end surface of the liquid outlet 71 of the direct-writing printing needle 7, the morphology control device of the present embodiment further includes a control material assembly 4. The material control assembly 4 comprises a material suction slit 41 penetrating through the second surface 2, and a material suction part 42 in through connection with one end of the material suction slit 41 close to the first surface 1; the suction slit 41 is formed with a liquid guide port 43 for guiding ink on one end surface of the liquid outlet 71 of the direct-write head 7 to flow along the suction slit 41 on the side close to the second surface 2. In the present embodiment, the suction slit 41 is an annular suction slit 41 which surrounds the second placement port 21 and is disposed coaxially therewith. By providing the annular suction slit 41, on the one hand, a larger accommodation space is provided for suction of ink, and thus can be applied to the through-write head 7 having a larger ink accumulation amount; on the other hand, the contact surface between the liquid guide opening 43 and the ink can be increased, so that along with the continuous accumulation of the ink in the liquid outlet 71 of the direct-writing printing needle at the central position, the ink is contacted with the liquid guide openings 43 uniformly distributed around, the ink sucking effect of the material sucking component 42 is better, the residual ink on the surface of the liquid outlet 71 of the direct-writing printing needle is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct-write printing needle 7 to quickly contact with the liquid guide port 43 during the acceleration and deceleration stage, the length of the process edge is further shortened, and the second surface 2 of the liquid guide port 43, which is connected with the center of the second placement port 21, is higher than the second surface 2, which is close to the center of the second placement port 21.
In addition, when the second surface 2 is relatively close to or even concentric with the liquid outlet 71 of the direct-write head 7, the discharged ink will necessarily touch the second surface 2, especially the liquid guide 43 disposed near the liquid outlet 71. Thus, on the one hand, the ink topography of both the printed constant velocity segment and the acceleration and deceleration segment will be affected; on the other hand, the ink of a normal flow rate is easily sucked out by the suction member 42. Therefore, in order to avoid the material sucking component 42 from sucking the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 indiscriminately, while ensuring the quality of the printed product in the constant speed section, the length of the process edge is shortened, and the printing waste is reduced, in this embodiment, the diameter of the second placement opening 21 is larger than the diameter of the liquid outlet 71 of the direct-writing printing needle, which means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, the material sucking component can be triggered to suck the ink only when the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 is accumulated to a certain amount.
Example 3
The embodiment discloses a morphology controlling means for pneumatic type direct-write printing syringe needle, morphology controlling means includes:
a first surface 1 and a second surface 2 which are correspondingly arranged up and down, and a mounting hole 3 which penetrates through the first surface 1 and the second surface 2 and is used for mounting a direct-writing printing needle 7; one end of the mounting hole 3 forms a first mounting opening 11 with the first surface 1, and the other end of the mounting hole 3 forms a second mounting opening 21 with the second surface 2. The morphology control device of this embodiment provides great convenience for the subsequent installation of the direct-writing printing needle 7 by providing the first surface 1, the second surface 2, the installation hole 3 penetrating the first surface 1 and the second surface 2, and the first installation opening 11 and the second installation opening 21 matched with the installation hole 3. Specifically, in the process of installing the morphology control device, the liquid outlet 71 of the direct-writing printing needle 7 only needs to sequentially pass through the first placement opening 11 and the second placement opening 21, and the morphology control device is sleeved inside the installation hole 3. At this time, the first mounting port 11, the second mounting port 21, and the mounting hole 3 are tightly connected to part or all of the side surfaces of the write-through stylus head 7, and the mounting is completed. Therefore, the device is simple in installation method, structural modification of the pneumatic direct-writing printing needle head 7 is not needed, application flexibility is higher, and overhauling and replacement of the morphology control device are facilitated. In addition, in this embodiment, the outer surface of the morphology control device is in a shape of a truncated cone, and the material is selected from copper.
In order to suck ink on one end surface of the liquid outlet 71 of the direct-writing printing needle 7, the morphology control device of the present embodiment further includes a control material assembly 4. The material control assembly 4 comprises a material suction slit 41 penetrating through the second surface 2, and a material suction part 42 in through connection with one end of the material suction slit 41 close to the first surface 1; the suction slit 41 is formed with a liquid guide port 43 for guiding ink on one end surface of the liquid outlet 71 of the direct-write head 7 to flow along the suction slit 41 on the side close to the second surface 2. In the present embodiment, the suction slit 41 is an annular suction slit 41 which surrounds the second placement port 21 and is disposed coaxially therewith. By providing the annular suction slit 41, on the one hand, a larger accommodation space is provided for suction of ink, and thus can be applied to the through-write head 7 having a larger ink accumulation amount; on the other hand, the contact surface between the liquid guide opening 43 and the ink can be increased, so that along with the continuous accumulation of the ink in the liquid outlet 71 of the direct-writing printing needle at the central position, the ink is contacted with the liquid guide openings 43 uniformly distributed around, the ink sucking effect of the material sucking component 42 is better, the residual ink on the surface of the liquid outlet 71 of the direct-writing printing needle is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct-write printing needle 7 to quickly contact with the liquid guide port 43 during the acceleration and deceleration stage, the length of the process edge is further shortened, and the second surface 2 of the liquid guide port 43, which is connected with the center of the second placement port 21, is higher than the second surface 2, which is close to the center of the second placement port 21. When the second surface 2 is relatively close to or even concentric with the liquid outlet 71 of the write-through stylus 7, the discharged ink will necessarily touch the second surface 2, especially the liquid guide 43 arranged near the liquid outlet 71. Thus, on the one hand, the ink topography of both the printed constant velocity segment and the acceleration and deceleration segment will be affected; on the other hand, the ink of a normal flow rate is easily sucked out by the suction member 42. Therefore, in order to avoid the material sucking component 42 from sucking the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 indiscriminately, while ensuring the quality of the printed product in the constant speed section, the length of the process edge is shortened, and the printing waste is reduced, in this embodiment, the diameter of the second placement opening 21 is larger than the diameter of the liquid outlet 71 of the direct-writing printing needle, which means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, the material sucking component can be triggered to suck the ink only when the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 is accumulated to a certain amount.
In addition, in order to avoid the change of the ink flow caused by the surface temperature fluctuation of the direct-writing printing needle 7 in the continuous moving printing process of the direct-writing printing needle 7, the inner side surface of the mounting hole 3 of the morphology control device of the embodiment is provided with a temperature control component 5 for controlling the surface temperature of the direct-writing printing needle 7. The temperature control assembly 5 includes a temperature regulating member 51 for controlling the surface temperature of the write-through stylus head 7, and a temperature sensor 52 for measuring the surface temperature of the air-operated write-through stylus head 7. In order to sufficiently regulate the temperature of the surface of the write-through stylus head 7, the temperature regulating member 51 in this embodiment is a heating wire.
Example 4
The embodiment discloses pneumatic type direct-write printing needle, pneumatic type direct-write printing needle includes:
a printing head mounting base 6, and a direct-write printing head 7 provided on the printing head mounting base 6; a liquid outlet 71 is arranged at one end of the direct-writing printing needle 7, which is far away from the printing needle mounting base 6; the cross section of the write-through stylus 7 is continuously reduced along the ink flow direction of the liquid outlet 71. In the embodiment, by specially designing the shape of the direct-write printing needle 7, on one hand, the mechanical strength of the direct-write printing needle 7 is improved, so that the service life of the direct-write printing needle 7 is longer; on the other hand, before the ink is extruded, the temperature adjusting component 41 can further control the temperature of the ink in the direct-writing printing needle 7, and the ink temperature is reduced to influence the ink flow rate of the liquid outlet 71 of the direct-writing printing needle 7, so that the accuracy of the product obtained after printing is higher. The direct-writing printing needle head 7 is provided with a morphology control device, and the morphology control device comprises:
a first surface 1 and a second surface 2 which are correspondingly arranged up and down, and a mounting hole 3 which penetrates through the first surface 1 and the second surface 2 and is used for mounting a direct-writing printing needle 7; one end of the mounting hole 3 forms a first mounting opening 11 with the first surface 1, and the other end of the mounting hole 3 forms a second mounting opening 21 with the second surface 2. The morphology control device of this embodiment provides great convenience for the subsequent installation of the direct-writing printing needle 7 by providing the first surface 1, the second surface 2, the installation hole 3 penetrating the first surface 1 and the second surface 2, and the first installation opening 11 and the second installation opening 21 matched with the installation hole 3. Specifically, in the process of installing the morphology control device, the liquid outlet 71 of the direct-writing printing needle 7 only needs to sequentially pass through the first placement opening 11 and the second placement opening 21, and the morphology control device is sleeved inside the installation hole 3. At this time, the first mounting port 11, the second mounting port 21, and the mounting hole 3 are tightly connected to part or all of the side surfaces of the write-through stylus head 7, and the mounting is completed. Therefore, the device is simple in installation method, structural modification of the pneumatic direct-writing printing needle head 7 is not needed, application flexibility is higher, and overhauling and replacement of the morphology control device are facilitated. In addition, in order to further facilitate the installation, in this embodiment, the outer surface of the morphology control device is in a shape of a truncated cone, and the material is selected from rubber.
In order to suck ink on one end surface of the liquid outlet 71 of the direct-writing printing needle 7, the morphology control device of the present embodiment further includes a control material assembly 4. The material control assembly 4 comprises a material suction slit 41 penetrating through the second surface 2, and a material suction part 42 in through connection with one end of the material suction slit 41 close to the first surface 1; the suction slit 41 is formed with a liquid guide port 43 for guiding ink on one end surface of the liquid outlet 71 of the direct-write head 7 to flow along the suction slit 41 on the side close to the second surface 2. In the present embodiment, the suction slit 41 is an annular suction slit 41 which surrounds the second placement port 21 and is disposed coaxially therewith. By providing the annular suction slit 41, on the one hand, a larger accommodation space is provided for suction of ink, and thus can be applied to the through-write head 7 having a larger ink accumulation amount; on the other hand, the contact surface between the liquid guide opening 43 and the ink can be increased, so that along with the continuous accumulation of the ink in the liquid outlet 71 of the direct-writing printing needle at the central position, the ink is contacted with the liquid guide openings 43 uniformly distributed around, the ink sucking effect of the material sucking component 42 is better, the residual ink on the surface of the liquid outlet 71 of the direct-writing printing needle is less, and the length of the process edge can be further shortened. In addition, in order to enable the ink accumulated on the surface of the liquid outlet 71 of the direct-write printing needle 7 to quickly contact with the liquid guide port 43 during the acceleration and deceleration stage, the length of the process edge is further shortened, and the second surface 2 of the liquid guide port 43, which is connected with the center of the second placement port 21, is higher than the second surface 2, which is close to the center of the second placement port 21. When the second surface 2 is relatively close to or even concentric with the liquid outlet 71 of the write-through stylus 7, the discharged ink will necessarily touch the second surface 2, especially the liquid guide 43 arranged near the liquid outlet 71. Thus, on the one hand, the ink topography of both the printed constant velocity segment and the acceleration and deceleration segment will be affected; on the other hand, the ink of a normal flow rate is easily sucked out by the suction member 42. Therefore, in order to avoid the material sucking component 42 from sucking the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 indiscriminately, while ensuring the quality of the printed product in the constant speed section, the length of the process edge is shortened, and the printing waste is reduced, in this embodiment, the diameter of the second placement opening 21 is larger than the diameter of the liquid outlet 71 of the direct-writing printing needle, which means that by adjusting the liquid level difference between the second surface 2 and the liquid outlet 71, the material sucking component can be triggered to suck the ink only when the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 is accumulated to a certain amount.
In addition, in order to avoid the change of the ink flow caused by the surface temperature fluctuation of the direct-writing printing needle 7 in the continuous moving printing process of the direct-writing printing needle 7, the inner side surface of the mounting hole 3 of the morphology control device of the embodiment is provided with a temperature control component 5 for controlling the surface temperature of the direct-writing printing needle 7. The temperature control assembly 5 includes a temperature regulating member 51 for controlling the surface temperature of the write-through stylus head 7, and a temperature sensor 52 for measuring the surface temperature of the air-operated write-through stylus head 7. In order to sufficiently regulate the temperature of the surface of the write-through stylus head 7, the temperature regulating member 51 in this embodiment is a heating wire.
Example 5
The embodiment discloses a direct-write printing device, which comprises the pneumatic direct-write printing needle of the embodiment 4 and a lifting assembly for driving the pneumatic direct-write printing needle to move up and down. Other structures of the direct-writing printing device are the same as or similar to those of the prior art, and will not be described in detail herein.
Example 6
The present embodiment discloses a printing method for performing shuttle printing using the direct-write printing apparatus of embodiment 5, and the printing path is shown in fig. 3, and specifically:
in the embodiment, the printing speed of the direct-writing printing needle 7 in the constant speed stage is 200mm/s, and the acceleration in the acceleration and deceleration stage is 2 m/s. When the printing speed of the direct-writing printing needle head 7 is lower than the constant speed stage, the ink on the surface of the liquid outlet 71 of the direct-writing printing needle head 7 is continuously accumulated, and at the moment, the lifting assembly is started to lift the direct-writing printing needle head 7, so that the ink on the surface of the direct-writing printing needle head 7 is not contacted with the printing substrate; at the same time, the suction member 42 is started, so when the ink on the surface of the liquid outlet 71 of the direct-writing printing needle 7 is accumulated to a certain amount until the ink contacts with the liquid guide opening 43, the suction member 42 sucks the ink from the liquid outlet 71, so that the ink is sucked out along the liquid guide opening 43 and the suction slit 41 in sequence, no ink drop trace remains on the surface of the printing substrate after the ink is sucked out, and the recovered ink can still be reused.
In addition, in this embodiment, the temperature control component 5 is regulated and controlled, so that the precision of the printed product is further improved. Specifically, the monitoring probe of the temperature sensor 52 collects temperature data of the surface of the direct-write printing needle 7, and then the temperature data is uploaded to the controller through the communication module of the temperature sensor 52; the controller analyzes the temperature data, and regulates and controls the temperature of the surface of the direct-write printing needle 7 by commanding the temperature-raising and the temperature-lowering of the temperature-regulating member 51 according to the analysis result.
Example 7
The present embodiment discloses a printing method for performing shuttle printing using the direct-write printing apparatus of embodiment 5, and the printing path is shown in fig. 3, and specifically:
in the embodiment, the printing speed of the direct-writing printing needle 7 in the constant speed stage is 200mm/s, and the acceleration in the acceleration and deceleration stage is 2 m/s. When the printing speed of the direct-writing printing needle head 7 is lower than the constant speed stage, the ink on the surface of the liquid outlet 71 of the direct-writing printing needle head 7 is continuously accumulated, at the moment, the feeding air pressure is closed, and part of the ink on the surface of the direct-writing printing needle head 7 is still extruded slowly due to the delay effect of the air pressure response; the material sucking component 42 is started to suck the ink from the liquid outlet 71, so that the ink is sucked out along the liquid guide opening 43 and the material sucking slit 41 in sequence, no ink drop trace remains on the surface of the printing substrate after the ink is sucked out, and the recovered ink can still be reused.
In addition, in this embodiment, the temperature control component 5 is regulated and controlled, so that the precision of the printed product is further improved. Specifically, the monitoring probe of the temperature sensor 52 collects temperature data of the surface of the direct-write printing needle 7, and then the temperature data is uploaded to the controller through the communication module of the temperature sensor 52; the controller analyzes the temperature data, and regulates and controls the temperature of the surface of the direct-write printing needle 7 by commanding the temperature-raising and the temperature-lowering of the temperature-regulating member 51 according to the analysis result.
Comparative example 1
Comparative example 1 is a direct-write printing apparatus in which the topography control device of the present invention is not mounted. The print path of the write-through printing apparatus is different from that of embodiment 6 in that the present comparative example 1 does not raise the write-through printing head 7 at the acceleration and deceleration stage), and the print speed and acceleration are kept identical to those of embodiment 6.
Performance testing
And (3) respectively carrying out process edge morphology analysis and line height data measurement of the uniform-speed effective printing area on the printing products prepared in the example 6 and the comparative example 1, and drawing a chart to obtain figures 4-7.
Referring to fig. 4 and 6, by observing the enlarged partial topography of the printed product produced by the direct-write printing apparatus of example 6 and comparative example 1, it can be seen that: the length of the process edge of the printing product of the comparative example 1 is up to 10mm, and the process edge of the printing product obtained by the invention is only 1/5 of the length of the process edge of the comparative example 1, therefore, the invention can effectively solve the problem of overlong process edge of the existing printing product by installing the shape control device on the direct-writing printing needle head and matching with a special use method, and greatly reduces the waste of ink in the printing process.
Referring to fig. 5 and 7, by observing the line height differences of the same line in different printing areas and the line height differences of different lines in the same printing area of the printed product prepared in example 6 and comparative example 1, it can be found that the line heights of the printed product obtained in comparative example 1 among a plurality of printing lines in the same area are scattered, the line height differences of the same printing line among different areas are large, and the appearance is reflected as uneven at the same line position in the effective area, and the rough appearance of the uniform effective printing area in fig. 6 is mutually verified, so that the conventional direct-writing printing device has the advantages of not only being long in process side, but also being low in printing integral precision. As can be seen from the contrary view of FIG. 5, the printed product prepared by the invention has higher line height concentration degree among all printed lines, and smaller line height difference among different areas of the same printed line, and can effectively solve the problem of overlong process side of the existing printed product and further improve the printing precision by installing the morphology control device on the direct-writing printing needle head and matching with a special use method.
Although the reference numerals in the figures are used more herein: 1. the terms of the first surface, 2, the second surface, 3, the mounting hole, 11, the first mounting hole, 21, the second mounting hole, 4, the material control component, 41, the material suction slit, 42, the material suction component, 43, the liquid guide hole, 5, the temperature control component, 51, the temperature adjusting component, 52, the temperature sensor, 6, the printing needle mounting base, 7, the direct writing printing needle, 71, the liquid outlet and the like are not excluded, but the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (10)
1. The morphology control device for the pneumatic direct-writing printing pinhead is characterized by comprising a first surface and a second surface which are correspondingly arranged, and a mounting hole penetrating through the first surface and the second surface and used for mounting the direct-writing printing pinhead; one end of the mounting hole and the first surface form a first placement opening, and the other end of the mounting hole and the second surface form a second placement opening; the morphology control device further comprises a control material assembly, wherein the control material assembly comprises a material sucking slit penetrating through the second surface and a material sucking part in through connection with one end, close to the first surface, of the material sucking slit; and a liquid guide port for guiding the ink on the liquid outlet surface of the direct-writing printing needle head to flow along the material suction slit is formed on one side of the material suction slit close to the second surface, and the diameter of the second placement port is larger than that of the liquid outlet of the direct-writing printing needle head.
2. The topography control device for a pneumatic direct write printhead of claim 1, wherein said suction slit is coaxially disposed with said second mounting port.
3. A form control device for a pneumatic write-through printing head according to any one of claims 1 or 2, characterized in that the inside surface of the mounting hole is provided with a temperature control assembly for controlling the surface temperature of the write-through printing head.
4. A topography control device for a pneumatic write-through stylus according to claim 3, wherein the temperature control assembly comprises a temperature regulating component and a temperature sensor for determining the temperature of the surface of the pneumatic write-through stylus.
5. A pneumatic direct write printing needle comprising the topography control device of any one of claims 1-4.
6. A pneumatic direct write printing pin as defined in claim 5, wherein the pneumatic direct write printing pin comprises a printing pin mounting base and a direct write printing pin disposed on the printing pin mounting base; a liquid outlet is formed in one end, far away from the printing needle mounting base, of the direct-writing printing needle; along the flowing direction of the liquid outlet ink, the section of the direct-writing printing needle head is continuously reduced.
7. A direct write printing apparatus comprising a pneumatic direct write printing needle as claimed in any one of claims 5 or 6.
8. The direct write printing apparatus of claim 7, further comprising a lift assembly for moving the pneumatic direct write printing needle up and down.
9. A method of using the direct-write printing apparatus, characterized in that the direct-write printing apparatus according to any one of claims 7 or 8 is used; the using method comprises the following steps: in the acceleration and deceleration stage of direct-writing printing, the direct-writing printing needle head is lifted, so that the ink on the surface of the direct-writing printing needle head is not contacted with a printing substrate, and the material sucking component is started, so that the ink connected with the liquid guide port is sucked out along the liquid guide port and the material sucking slit in sequence; or in the acceleration and deceleration stage of direct-writing printing, the feeding air pressure is closed, and the material sucking component is opened, so that the ink connected with the liquid guide port is sucked out along the liquid guide port and the material sucking slit in sequence.
10. The method of use of claim 9, further comprising the steps of:
s1, a monitoring probe of a temperature sensor collects temperature data of the surface of a direct-write printing needle head, and the temperature data is uploaded to a controller through a communication module of the temperature sensor;
s2, the controller analyzes the temperature data, and regulates and controls the temperature of the surface of the direct-writing printing needle head by commanding the temperature regulating component to raise and lower according to the analysis result.
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| CN103587250A (en) * | 2012-08-13 | 2014-02-19 | 克罗内斯股份公司 | Method for sucking printing ink, printing device, and print head for same and |
| CN107471638A (en) * | 2017-07-18 | 2017-12-15 | 葛顺英 | A kind of energy-saving 3D printing equipment |
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| WO2021114602A1 (en) * | 2020-06-19 | 2021-06-17 | 深圳摩方新材科技有限公司 | 3d printing method and 3d printing system |
| CN113118455A (en) * | 2021-04-23 | 2021-07-16 | 吉林大学重庆研究院 | 3D printing method for preparing metal artificial bone based on slurry direct writing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105196550B (en) * | 2015-10-30 | 2018-01-23 | 兰红波 | A kind of multiple dimensioned 3D printing device of more materials of single nozzle and its method of work |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103587250A (en) * | 2012-08-13 | 2014-02-19 | 克罗内斯股份公司 | Method for sucking printing ink, printing device, and print head for same and |
| CN107471638A (en) * | 2017-07-18 | 2017-12-15 | 葛顺英 | A kind of energy-saving 3D printing equipment |
| CN107825705A (en) * | 2017-11-27 | 2018-03-23 | 安徽拓宝增材制造科技有限公司 | A kind of power spreading device of recyclable powder |
| WO2021114602A1 (en) * | 2020-06-19 | 2021-06-17 | 深圳摩方新材科技有限公司 | 3d printing method and 3d printing system |
| CN113118455A (en) * | 2021-04-23 | 2021-07-16 | 吉林大学重庆研究院 | 3D printing method for preparing metal artificial bone based on slurry direct writing |
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