Hot roller assisted fused deposition modeling device

Abstract

The invention belongs to the technical field of additive manufacturing, discloses a hot roller assisted fused deposition modeling device, and aims to solve the problem that the interlayer bonding strength of traditional FDM printing is insufficient. The device comprises a hot roller mechanism, a hot roller Y-axis moving mechanism, a hot roller Z-axis moving mechanism, a spray head, an FDM printer rear plate, a spray head moving mechanism, a base plate, a printing platform, a printing platform Z-axis moving mechanism and an aluminum profile frame. After the nozzle prints a deposition layer on the substrate, the printing platform moves downwards by a preset distance through the printing platform Z-axis moving mechanism, and then the hot roller mechanism rolls the adjacent deposition layer through the hot roller Y-axis moving mechanism and the hot roller Z-axis moving mechanism. Under the action of proper high temperature and pressure of the hot roller, layer lines are reduced, the density and mechanical performance of a printed piece are improved, and the interlayer bonding strength is enhanced. The device is simple in structure, economical and practical, and the interlayer bonding strength of the FDM printing piece is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the field of additive manufacturing and relates to a hot rolling roll-assisted fused deposition modeling device. Background Art

[0002] Additive manufacturing (also known as 3D printing) is widely described as a disruptive technology that can produce geometrically optimized components at a relatively low cost and has functions that cannot be achieved by traditional manufacturing methods. The fused deposition modeling (FDM) technology has been widely applied and popularized in the field of additive manufacturing due to its low cost, simple operation, high precision, good flexibility and processability. FDM uses thermoplastic materials (such as wax, ABS, nylon, etc.) as raw materials, melts and extrudes them in a nozzle through filament feeding after heating, and the nozzle moves along a predetermined trajectory to achieve layer-by-layer stacking and forming. However, the mechanical properties of FDM printed parts are significantly lower than those of injection molded parts. The main reason is that its layer-by-layer manufacturing process results in weak interlayer adhesion. Although there have been improvement measures such as continuous fiber reinforcement, process optimization and research and development of new materials, the interlayer bonding problem still restricts the further development of FDM technology. Therefore, there is an urgent need for a new and effective method to enhance the interlayer bonding strength. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of poor bonding strength between layers in the vertical processing direction of fused deposition modeling. To overcome this technical problem, a hot rolling roll-assisted fused deposition modeling device is provided.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A hot rolling roll-assisted fused deposition modeling device includes a hot rolling roll mechanism, a hot rolling roll Y-axis moving mechanism, a hot rolling roll Z-axis moving mechanism, a nozzle, an FDM printer rear plate, a nozzle moving mechanism, a substrate, a printing platform, a printing platform Z-axis moving mechanism and an aluminum profile frame; It is characterized in that: the hot rolling roll mechanism is connected to the hot rolling roll Y-axis moving mechanism and the hot rolling roll Z-axis moving mechanism on the aluminum profile frame through corresponding connecting parts. Driven by the nozzle movement mechanism, the nozzle moves in the X and Y directions along a preset path, extrudes and melts the wire material, and deposits it on the substrate or the previous deposited layer to form a new deposited layer. After the deposition is completed, the nozzle returns to the origin, and the printing platform moves downward along the Z-axis driven by the printing platform Z-axis moving mechanism to prepare for the next layer of deposition. After the deposited layer is formed, the hot rolling roll mechanism moves a corresponding distance along the Z direction to the upper part of the deposited layer and keeps the Z-axis position unchanged driven by the hot rolling roll Z-axis moving mechanism, and then the hot rolling roll mechanism is driven by the hot rolling roll Y-axis moving mechanism to move along the Y-axis to apply roll pressure to the deposited layer. During the roll pressing process, the preset high temperature of the hot rolling roll raises the temperature of the surface material of the deposited layer, and the pressure of the hot rolling roll further combines the pressed deposited layer with the previous deposited layer. Under the action of the appropriate high temperature and pressure of the hot rolling roll, the pressed deposited layer is secondarily fused with the previous deposited layer, thereby enhancing the interlayer bonding strength.

[0005] The hot rolling roll mechanism described in the present invention includes: a hot rolling roll, a slip ring, and a hot rolling roll bearing seat. The hot rolling roll is connected to the hot rolling roll Y-axis moving mechanism through the hot rolling roll bearing seats at both ends. The hot rolling roll mechanism and the hot rolling roll Y-axis moving mechanism extend into the FDM printer together and are positioned directly above the substrate. The heating method of the hot rolling roll is electric heating, and a heating element is arranged inside it. The electric energy transmission is realized through the slip ring, so as to realize the heating function. The heating temperature can be determined according to the deposited material, and its surface is usually made of wear-resistant and high-temperature-resistant materials such as stainless steel or carbon steel to ensure good performance under high temperature and frequent friction.

[0006] The slip ring described in the present invention mainly realizes the electric energy or signal transmission during the rotation of the hot rolling roll, ensures the normal operation of related components such as the heating element, and avoids affecting the equipment operation due to the winding of the line caused by rotation.

[0007] The hot rolling roll Y-axis moving mechanism described in the present invention includes: a hot rolling roll Y-axis stepping motor, a hot rolling roll Y-axis stepping motor bracket, a hot rolling roll Y-axis coupling, a hot rolling roll Y-axis transmission lead screw, a hot rolling roll Y-axis lead screw nut, a hot rolling roll left Y-axis connecting part, a hot rolling roll right Y-axis connecting part, a hot rolling roll Y-axis moving device fixed housing, a hot rolling roll Y-axis lead screw fixed bearing seat, a linear guide rail, and a guide rail stopper. Among them, the hot rolling roll Y-axis moving mechanism is connected to the hot rolling roll mechanism through the hot rolling roll left Y-axis connecting part and the hot rolling roll right Y-axis connecting part, and is connected by means of tightening with bolts. By driving the rotation of the hot rolling roll Y-axis transmission lead screw by the hot rolling roll Y-axis stepping motor, the hot rolling roll mechanism 1 is driven to move precisely in a straight line along the Y-axis direction through the connection of the Y-axis connecting part and the lead screw nut. At the same time, the two linear guide rails provide stable support and precise guidance for the movement of the hot rolling roll, realizing the precise movement of the hot rolling roll in the Y-axis direction.

[0008] The linear guide rail and the guide rail stopper described in the present invention are fixed on the aluminum profile frame and the fixed housing of the Y-axis moving device of the hot rolling mill by bolts through the fixed holes of the linear guide rail, providing stable guidance and support for the movement of the hot rolling mill, ensuring the accuracy and stability of the hot rolling mill during movement, and reducing the influence of displacement deviation on the printing quality.

[0009] The left Y-axis connecting piece and the right Y-axis connecting piece of the hot rolling mill described in the present invention are key components connecting the hot rolling mill mechanism and the Y-axis moving mechanism of the hot rolling mill. They are connected to the Y-axis moving mechanism of the hot rolling mill through bolts via the following connecting holes: the lead screw nut connecting hole, the Y-axis linear guide rail connecting hole, and the hot rolling mill connecting hole.

[0010] The Z-axis moving mechanism of the hot rolling mill described in the present invention includes: a Z-axis stepping motor of the hot rolling mill, a Z-axis stepping motor bracket of the hot rolling mill, a Z-axis coupling of the hot rolling mill, a Z-axis T-shaped lead screw of the hot rolling mill, a fixed seat bearing, a Z-axis block nut of the hot rolling mill, a guide rail stopper, a linear guide rail, and a Z-axis connecting piece of the hot rolling mill. Among them, the Z-axis moving mechanism of the hot rolling mill is connected to the aluminum profile frame through the Z-axis connecting piece of the hot rolling mill, and then connected to the Y-axis moving mechanism of the hot rolling mill, thereby realizing the connection with the hot rolling mill mechanism. The Z-axis stepping motor of the hot rolling mill drives the Z-axis T-shaped lead screw of the hot rolling mill to rotate, and the power is transmitted to the hot rolling mill mechanism through the Z-axis block nut and the Z-axis connecting piece of the hot rolling mill. At the same time, the linear guide rails on both sides provide stable support and precise guidance for the movement of the hot rolling mill mechanism in the Z-axis direction, ensuring that the movement of the hot rolling mill in the Z-axis direction is accurate and stable to meet the printing layers and printing requirements of different heights.

[0011] The Z-axis connecting piece of the hot rolling mill described in the present invention is a key component connecting the Z-axis moving mechanism and the Y-axis moving mechanism of the hot rolling mill. It realizes the connection of the Z-axis moving mechanism and the Y-axis moving mechanism and the hot rolling mill mechanism through the following connecting holes: the Z-axis linear guide rail connecting hole and the Y-axis moving mechanism connecting hole.

[0012] The nozzle described in the present invention includes: a wire feeding mechanism, a heat dissipation mechanism, a heat dissipation fan, a heating mechanism, a nozzle, a light axis connecting hole, a nozzle and synchronous belt connecting hole, a nozzle back plate, and a nozzle housing. Among them, the nozzle housing not only plays a role in protecting and fixing the internal components, but also jointly forms the connection structure between the nozzle and the nozzle movement mechanism with the nozzle back plate. Specifically, the nozzle housing and the nozzle back plate are buckled together to form the light axis connecting hole and the nozzle and synchronous belt connecting hole. Through these two connecting holes, the nozzle is connected to the nozzle moving light axis, the upper synchronous belt, and the lower synchronous belt on the nozzle movement mechanism, thereby realizing the precise movement control of the nozzle in the X and Y directions. The wire feeding mechanism is responsible for precisely feeding the wire material to the nozzle. The heating mechanism heats the wire material to a molten state and extrudes it through the nozzle. The heat dissipation mechanism and the heat dissipation fan ensure the stability of the nozzle under high-temperature working conditions.

[0013] The main function of the rear panel of the FDM printer described in the present invention is to provide comprehensive protection for the electronic components and circuits inside the FDM printer, effectively preventing damage to the internal components caused by dust, debris, and external forces, while providing stable support for the overall structure of the printer.

[0014] The nozzle movement mechanism described in the present invention includes: an upper synchronous belt, a synchronous pulley, a nozzle movement mechanism stepper motor, a lower synchronous belt, a optical axis fixing seat, an optical axis linear bearing, and a nozzle moving optical axis. Among them, the nozzle movement mechanism stepper motor is connected to the upper synchronous belt and the lower synchronous belt through the synchronous pulley and the optical axis fixing seat to form a complete synchronous belt drive system. The nozzle moving optical axis is installed on the optical axis fixing seat through the optical axis linear bearing to provide support and guidance for the movement of the nozzle in the X and Y directions. The nozzle is connected to the nozzle moving optical axis and the synchronous belt drive system through the optical axis connection hole and the nozzle-synchronous belt connection hole, so as to achieve precise movement control of the nozzle in the X and Y directions under the drive of the nozzle movement mechanism stepper motor.

[0015] The printing platform Z-axis movement mechanism described in the present invention includes: a linear bearing, a printing platform Z-axis movement lead screw, a printing platform Z-axis stepper motor, a printing platform Z-axis fixing seat, and a printing platform Z-axis moving optical axis. Among them, the printing platform Z-axis stepper motor serves as the power source. By driving the rotation of the printing platform Z-axis movement lead screw, it drives the printing platform to move up and down along the Z-axis direction. The printing platform Z-axis moving optical axis is installed on the printing platform through the linear bearing to provide high-precision linear movement guidance for the printing platform, ensuring that the printing platform remains stable and precise during the movement. The upper part of the printing platform Z-axis movement lead screw and the printing platform Z-axis moving optical axis is fixed on the printing platform Z-axis fixing seat, and the lower part is fixed on the FDM printer base to ensure their installation accuracy and stability.

[0016] The aluminum profile frame described in the present invention includes: corner fittings, a number of 5-series aluminum profiles (side length 20×20 mm) and 8-series aluminum profiles (side length 20×40 mm). Through the connection of the corner fittings and the aluminum profiles, the standard aluminum profiles are precisely connected together to form a stable aluminum profile frame, and the hot rolling roll Y-axis movement mechanism and the hot rolling roll Z-axis movement mechanism are connected and supported. As the support structure of the entire device, this frame has significant advantages such as light weight, high strength, and corrosion resistance. It can not only provide a stable installation foundation for each component, but also effectively ensure the overall rigidity and stability of the device, thereby ensuring the precise position and movement of each component during the printing process and improving the printing quality and efficiency.

[0017] In addition, different thermoplastic materials have different requirements for the working parameters of the hot rolling roller. When changing the printing material, the parameters such as the temperature, pressure, and roller pressing speed of the hot rolling roller should be readjusted according to the characteristics of the material. The parameters can be optimized and determined by conducting a small amount of trial printing and observing the printing effect and the bonding situation between layers.

[0018] Compared with the prior art, the present invention has the following beneficial effects: Through the appropriate high temperature and pressure action of the hot rolling roller on adjacent deposited layers, the materials between layers are fully fused, effectively solving the problem of poor bonding strength between layers in the vertical processing direction of fused deposition modeling. Compared with traditional FDM printing, it can meet more application scenarios with higher requirements for mechanical properties. The hot rolling process makes the deposited layer materials more closely arranged, improves the surface quality of the printed parts, reduces surface roughness and layer lines, and makes the appearance of the printed parts smoother and flatter. The device of the present invention is improved on the basis of the existing FDM printer, mainly adding a hot rolling roller and its related driving and control components, and the structure is relatively simple and clear. Compared with some complex additive manufacturing improvement technologies, its manufacturing cost and maintenance cost are lower, and it is easy to be popularized and applied in actual production, providing a relatively economical and practical FDM printing enhancement solution. Description of the Drawings

[0019] Figure 1 Is a three-dimensional view of the overall device structure of the present invention; Figure 2 Is a three-dimensional view of the hot rolling roller mechanism of the present invention; Figure 3 Is a three-dimensional view of the Y-axis moving mechanism of the hot rolling roller of the present invention; Figure 4 Is an exploded three-dimensional view of the Y-axis moving mechanism of the hot rolling roller of the present invention; Figure 5 Is a three-dimensional view of the connection between the Z-axis moving mechanism of the hot rolling roller and the aluminum profile frame of the present invention; Figure 6 Is a front view of the connection between the Z-axis moving mechanism of the hot rolling roller and the aluminum profile frame of the present invention; Figure 7 Is a three-dimensional view of the Z-axis connecting piece of the hot rolling roller of the present invention; Figure 8 Is a three-dimensional view of the connection between the printing platform and the Z-axis moving mechanism of the printing platform of the present invention; Figure 9 Is a three-dimensional view of the nozzle movement mechanism of the present invention; Figure 10 Is a front view of the nozzle of the present invention; Figure 11 Is a cross-sectional view of the nozzle of the present invention.

[0020] Among them: 1 - hot rolling roll mechanism; 2 - Y-axis moving mechanism of hot rolling roll; 3 - Z-axis moving mechanism of hot rolling roll; 4 - aluminum profile frame; 5 - nozzle; 6 - rear plate of FDM printer; 7 - nozzle movement mechanism; 8 - substrate; 9 - printing platform; 10 - Z-axis moving mechanism of printing platform; 11 - base of FDM printer; 12 - hot rolling roll; 13 - slip ring; 14 - bearing block of hot rolling roll; 15 - linear guide rail; 16 - guide rail stop block; 17 - Y-axis stepper motor bracket of hot rolling roll; 18 - Y-axis stepper motor of hot rolling roll; 19 - Y-axis coupling of hot rolling roll; 20 - Y-axis transmission lead screw of hot rolling roll; 21 - left Y-axis connecting part of hot rolling roll; 22 - Y-axis lead screw nut of hot rolling roll; 23 - fixed housing of Y-axis moving device of hot rolling roll; 24 - fixed bearing block of Y-axis lead screw of hot rolling roll; 25 - right Y-axis connecting part of hot rolling roll; 26 - fixed hole of linear guide rail; 27 - connecting hole of lead screw nut; 28 - connecting hole of Y-axis linear guide rail; 29 - connecting hole of hot rolling roll; 30 - Z-axis stepper motor bracket of hot rolling roll; 31 - Z-axis stepper motor of hot rolling roll; 32 - Z-axis coupling of hot rolling roll; 33 - Z-axis T-shaped lead screw of hot rolling roll; 34 - Z-axis block nut of hot rolling roll; 35 - fixed seat bearing; 36 - Z-axis connecting part of hot rolling roll; 37 - connecting hole of Z-axis linear guide rail; 38 - connecting hole of Y-axis moving mechanism; 39 - linear bearing; 40 - Z-axis moving lead screw of printing platform; 41 - Z-axis stepper motor of printing platform; 42 - fixed seat of Z-axis of printing platform; 43 - moving optical axis of Z-axis of printing platform; 44 - upper synchronous belt; 45 - synchronous pulley; 46 - stepper motor of nozzle movement mechanism; 47 - lower synchronous belt; 48 - fixed seat of optical axis; 49 - linear bearing of optical axis; 50 - moving optical axis of nozzle; 51 - wire feeding mechanism; 52 - heat dissipation mechanism; 53 - heat dissipation fan; 54 - heating mechanism; 55 - nozzle; 56 - connecting hole of optical axis; 57 - connecting hole of nozzle and synchronous belt; 58 - nozzle back plate; 59 - nozzle housing; 60 - angle fitting. Detailed implementation manner

[0021] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figure 1 , a hot rolling roll-assisted fused deposition modeling device in this embodiment includes: a hot rolling roll mechanism 1, a Y-axis moving mechanism 2 of the hot rolling roll, a Z-axis moving mechanism 3 of the hot rolling roll, a nozzle 5, a rear plate 6 of the FDM printer, a nozzle movement mechanism 7, a substrate 8, a printing platform 9, a Z-axis moving mechanism 10 of the printing platform, and an aluminum profile frame 4.

[0023] Please refer to Figure 2 , the hot rolling roll mechanism 1 in this embodiment includes: a hot rolling roll 12, a slip ring 13, and a bearing housing 14; both ends of the hot rolling roll 12 extend into the hot rolling roll bearing housing 14, and the hot rolling roll bearing housing 14 provides fixation and support for the hot rolling roll 12.

[0024] Please refer to Figure 3 and Figure 4 , the Y-axis moving mechanism 2 of the hot rolling roll in this embodiment includes: a Y-axis stepping motor 18 of the hot rolling roll, a Y-axis stepping motor bracket 17 of the hot rolling roll, a Y-axis coupling 19 of the hot rolling roll, a Y-axis transmission lead screw 20 of the hot rolling roll, a Y-axis lead screw nut 22 of the hot rolling roll, a left Y-axis connecting member 21 of the hot rolling roll, a right Y-axis connecting member 25 of the hot rolling roll, a fixed housing 23 for the Y-axis moving device of the hot rolling roll, a fixed bearing housing 24 for the Y-axis lead screw of the hot rolling roll, a linear guide rail 15, and a guide rail stopper 16; wherein, the upper side of the left Y-axis connecting member 21 of the hot rolling roll is connected to the Y-axis lead screw nut 22 of the hot rolling roll through a lead screw nut connection hole 27, and the left side is connected to the linear guide rail 15 through a Y-axis linear guide rail connection hole 28. At the same time, the left linear guide rail 15 is connected to the fixed housing 23 for the Y-axis moving device of the hot rolling roll in a bolt connection manner through a linear guide rail fixing hole 26; the right linear guide rail 15 is bolt-connected to the right Y-axis connecting member 25 of the hot rolling roll through a Y-axis linear guide rail connection hole 28, and the right Y-axis connecting member 25 of the hot rolling roll is bolt-connected to the hot rolling roll bearing housing 14 in the hot rolling roll mechanism 1 through a hot rolling roll connection hole 29; this connection method can not only assist in supporting the hot rolling roll mechanism 1, but also work in cooperation with the left Y-axis connecting member 21. Through the connection of the left Y-axis connecting member 21 of the hot rolling roll, the right Y-axis connecting member 25 of the hot rolling roll, the linear guide rail 15, and the Y-axis lead screw nut 22 of the hot rolling roll, the connection between the hot rolling roll mechanism 1 and the Y-axis moving mechanism 2 of the hot rolling roll is realized. By driving the rotation of the Y-axis transmission lead screw 20 of the hot rolling roll by the Y-axis stepping motor 18 of the hot rolling roll, the hot rolling roll mechanism 1 is driven to perform precise linear movement along the Y-axis direction through the connection of the Y-axis connecting member and the lead screw nut. At the same time, the two linear guide rails 15 provide stable support and precise guidance for the movement of the hot rolling roll 12, realizing the precise movement of the hot rolling roll 12 in the Y-axis direction and meeting the requirement of uniformly rolling the deposited layer.

[0025] Please refer to Figure 5 , Figure 6 and Figure 7, the Z-axis moving mechanism 3 of the hot rolling roll in this embodiment includes: a hot rolling roll Z-axis stepping motor 31, a hot rolling roll Z-axis stepping motor bracket 30, a hot rolling roll Z-axis coupling 32, a hot rolling roll Z-axis T-shaped lead screw 33, a fixed seat bearing 35, a hot rolling roll Z-axis block nut 34, a linear guide block 16, a linear guide 15, and a hot rolling roll Z-axis connecting member 36; among them, the hot rolling roll Z-axis connecting member 36 is connected to the linear guide 15 through a Z-axis linear guide connection hole 37 and is connected to the hot rolling roll Y-axis moving mechanism 2 through a Y-axis moving mechanism connection hole 38. This connection method can not only assist in supporting the hot rolling roll Z-axis moving mechanism 3, but also closely cooperate with the hot rolling roll Y-axis moving mechanism 2 to realize the movement of the hot rolling roll mechanism 1 in the Z-axis direction. The hot rolling roll Z-axis stepping motor 31 drives the rotation of the hot rolling roll Z-axis T-shaped lead screw 33, and the power is transmitted to the hot rolling roll mechanism 1 through the hot rolling roll Z-axis block nut 34 and the hot rolling roll Z-axis connecting member 36. At the same time, the linear guides 15 fixed on both sides of the aluminum profile frame 4 provide stable support and precise guidance for the movement of the hot rolling roll mechanism 1 in the Z-axis direction, so as to ensure the balance and precision when the hot rolling roll 12 moves in the Z-axis direction.

[0026] Please refer to Figure 8 , the Z-axis moving mechanism 10 of the printing platform in this embodiment includes: a linear bearing 39, a printing platform Z-axis moving lead screw 40, a printing platform Z-axis stepping motor 41, a printing platform Z-axis fixed seat 42, and a printing platform Z-axis moving optical axis 43; the printing platform Z-axis stepping motor 41 drives the rotation of the printing platform Z-axis moving lead screw 40, driving the printing platform 9 to move up and down in the Z-axis direction. The printing platform Z-axis moving optical axis 43 is installed on the printing platform 9 through a linear bearing 39, providing linear motion guidance for the printing platform 9 to ensure that the printing platform 9 remains stable and precise during the movement. The upper part of the printing platform Z-axis moving lead screw 40 and the printing platform Z-axis moving optical axis 43 is fixed on the printing platform Z-axis fixed seat 42, and the lower part is fixed on the FDM printer base 11.

[0027] Please refer to Figure 9 , the nozzle movement mechanism 7 in this embodiment includes: an upper synchronous belt 44, a synchronous pulley 45, a nozzle movement mechanism stepping motor 46, a lower synchronous belt 47, an optical axis fixed seat 48, an optical axis linear bearing 49, and a nozzle moving optical axis 50; the nozzle movement mechanism stepping motor 46 is connected to the upper synchronous belt 44 and the lower synchronous belt 47 through the synchronous pulley 45 and the optical axis fixed seat 48 to form a complete synchronous belt drive system. The nozzle moving optical axis 50 is installed on the optical axis fixed seat 48 through an optical axis linear bearing 49, providing support and guidance for the movement of the nozzle in the X and Y directions. The nozzle 5 is connected to the nozzle moving optical axis 50 and the synchronous belt drive system through an optical axis connection hole 56 and a nozzle-synchronous belt connection hole 57, so as to realize precise movement control of the nozzle in the X and Y directions under the drive of the nozzle movement mechanism stepping motor 46.

[0028] Please refer to Figure 10 and Figure 11 In this embodiment, the nozzle 5 includes: a wire feeding mechanism 51, a heat dissipation mechanism 52, a heat dissipation fan 53, a heating mechanism 54, a nozzle 55, a optical axis connection hole 56, a nozzle and synchronous belt connection hole 57, a nozzle back plate 58 and a nozzle housing 59; the nozzle housing 59 and the nozzle back plate 58 are buckled with each other to form the optical axis connection hole 56 and the nozzle and synchronous belt connection hole 57, which are respectively connected to the nozzle moving optical axis 50 and the synchronous belt drive system. This connection method enables the nozzle 5 to move precisely in the X and Y directions under the drive of the nozzle motion mechanism 7. The wire feeding mechanism 51 is responsible for precisely feeding the wire material to the nozzle 55, the heating mechanism 54 heats the wire material to a molten state and extrudes it through the nozzle 55, and the heat dissipation mechanism 52 and the heat dissipation fan 53 ensure the stability of the nozzle under high-temperature working conditions, thereby ensuring the smooth progress of the printing process.

[0029] Please refer to Figures 1 to 10 The hot rolling roll mechanism 1 is connected to the hot rolling roll Y-axis moving mechanism 2 through the hot rolling roll bearing seat 14, the left Y-axis connecting piece 21 of the hot rolling roll and the right Y-axis connecting piece 25 of the hot rolling roll. By driving the rotation of the hot rolling roll Y-axis transmission lead screw 20 through the hot rolling roll Y-axis stepper motor 18, the two linear guide rails 15 are driven to move along the Y-axis direction, realizing the precise movement of the hot rolling roll 12 in the Y-axis direction. On the other hand, the hot rolling roll Y-axis moving mechanism 2 is connected to the hot rolling roll Z-axis moving mechanism 3 through the angle piece 60, the hot rolling roll Z-axis connecting piece 36 and the aluminum profile frame 4, realizing the Z-axis movement of the hot rolling roll 12. This connection ensures the integrity and structural strength of the device, enables the components to work together, and ensures the precise positioning of the hot rolling roll-assisted fused deposition modeling process.

[0030] On the other hand, an implementation manner of a hot rolling roll-assisted fused deposition modeling device according to the present invention is as follows: 1. According to the printing requirements, select a suitable thermoplastic wire material and install it on the wire feeding mechanism 51 of the nozzle 5. By setting parameters such as the diameter of the wire material in the wire feeding mechanism 51 and the wire feeding speed of the wire feeding stepper motor, ensure that the wire material can be stably fed into the nozzle 5.

[0031] 2. Set the parameters of the printing model in the control system, such as the size, layer thickness, filling rate, etc. of the model, and at the same time set the working parameters of the hot rolling roll 12, including temperature, pressure, roll pressing speed, etc. The temperature parameter should be adjusted according to the type and characteristics of the wire material, generally within the range of 10 - 30 °C above the glass transition temperature of the material; the pressure parameter can be initially set according to the thickness of the printing layer and the fluidity of the material, and fine-tuned according to the effect during the actual printing process; the roll pressing speed needs to match the printing speed of the nozzle 5 to ensure effective roll pressing operation in a timely manner after each layer is deposited.

[0032] 3. Start the FDM printer and the hot rolling roller mechanism 1. The printer nozzle 5 starts to heat the wire material. When the wire material melts to reach the set temperature and fluidity, the nozzle 5 moves along the X and Y directions according to the preset printing path, extrudes the melted wire material through the nozzle 55 and deposits it on the substrate 8 to form the first deposited layer. After the first layer of deposition is completed, the nozzle 5 returns to the initial position along the -X, -Y directions. At the same time, the printing platform Z-axis stepping motor 41 drives the printing platform Z-axis moving lead screw 40 to move the printing platform 9 downward by a preset layer thickness distance along the Z-axis direction to prepare for the next layer of deposition.

[0033] 4. The nozzle 5 continues to move along the X and Y directions according to the preset printing path, extrudes the melted wire material and deposits it on the first deposited layer to form the second deposited layer. After the second layer of deposition is completed, the nozzle 5 returns to the initial position along the -X, -Y directions. At the same time, the printing platform Z-axis stepping motor 41 drives the printing platform Z-axis moving lead screw 40 to move the printing platform 9 downward by a preset layer thickness distance along the Z-axis direction to prepare for the next layer of deposition.

[0034] 5. The control system drives the hot rolling roller Z-axis stepping motor 31 according to the preset program to move the hot rolling roller 12 to a specific distance above the second deposited layer. The gap between the roller and the deposited layer to be pressed is adjusted according to the required pressure and processing conditions. The hot rolling roller Y-axis stepping motor 18 drives the hot rolling roller Y-axis transmission lead screw 20 to roll the second deposited layer in the Y-axis direction at a set speed and pressure. During the rolling process, the heat of the hot rolling roller 12 is transferred to the deposited layer, further softening the surface material of the deposited layer. Under the action of pressure and temperature, the interlayer contact area between the third deposited layer and the second deposited layer is increased, and the two deposited layers are further fused.

[0035] 6. After the rolling of the second layer is completed, the hot rolling roller Y-axis stepping motor 18 continues to drive the hot rolling roller Y-axis transmission lead screw 20 to move the hot rolling roller 12 back to the initial position in the Y-axis direction. The nozzle 5 performs the third layer of deposition. The nozzle 5 moves along the X and Y directions according to the preset printing path, extrudes the melted wire material through the nozzle 55 and deposits it on the second deposited layer to form the third deposited layer. After the second layer of deposition is completed, the nozzle 5 returns to the initial position along the -X, -Y directions. At the same time, the printing platform 9 moves downward by a preset layer thickness distance along the Z direction to prepare for the next layer of deposition.

[0036] 7. The hot rolling roller Y-axis stepping motor 18 drives the hot rolling roller Y-axis moving mechanism 2 to move the hot rolling roller 12 in the Y-axis direction to roll the third deposited layer with a certain pressure.

[0037] 8. After the roll pressing of the third layer is completed, the hot rolling roll Y-axis stepper motor 18 continues to drive the hot rolling roll Y-axis transmission lead screw 20, so that the hot rolling roll 12 returns to the initial position in the Y-axis direction. The nozzle 5 moves along the X and Y directions according to the preset printing path, extrudes the melted wire material and deposits it on the second layer deposition layer to form the fourth layer deposition layer. When the deposition of the fourth layer is completed, the nozzle 5 returns to the initial position along the -X, -Y directions. At the same time, the printing platform 9 moves down a preset layer thickness distance in the Z direction to prepare for the deposition of the next layer.

[0038] 9. The hot rolling roll Y-axis stepper motor 18 drives the hot rolling roll Y-axis moving mechanism 2, so that the hot rolling roll 12 moves in the Y-axis direction to roll press the fourth layer deposition layer with a certain pressure.

[0039] 10. After the roll pressing of the Nth layer is completed, the hot rolling roll Y-axis stepper motor 18 continues to drive the hot rolling roll Y-axis moving mechanism 2, so that the hot rolling roll 12 returns to the initial position in the Y-axis direction. The nozzle 5 moves along the X and Y directions according to the preset printing path, extrudes the melted wire material and deposits it on the (N + 1)th layer deposition layer to form the (N + 1)th layer deposition layer. When the deposition of the (N + 1)th layer is completed, the nozzle 5 returns to the initial position along the -X, -Y directions. At the same time, the printing platform 9 moves down a preset layer thickness distance in the Z direction to prepare for the deposition of the next layer.

[0040] 11. The hot rolling roll Y-axis stepper motor 18 drives the hot rolling roll Y-axis moving mechanism 2, so that the hot rolling roll 12 moves in the Y-axis direction to roll press the (N + 1)th layer deposition layer with a certain pressure.

[0041] Repeat the above roll pressing process to further fuse adjacent layer deposition layers. After that, for each completed layer of deposition, the hot rolling roll 12 performs a roll pressing operation on the new deposition layer until the entire model printing is completed.

[0042] In the traditional fused deposition modeling process, the wire material is melted and extruded in the nozzle 5 for deposition. Since the lower layer material cools rapidly before the upper layer material is deposited, insufficient interlayer molecular diffusion occurs, resulting in weak bonding strength. In the present invention, by introducing a hot rolling roll auxiliary device, the deposited layer is roll pressed by the hot rolling roll 12 after each layer of deposition. The heat of the hot rolling roll 12 re-softens the surface material of the deposited layer to reach or approach the glass transition temperature of the material. At this time, the activity of the material molecules increases and the fluidity enhances. Thereby effectively improving the interlayer bonding strength. At the same time, this thermo-mechanical effect can also make the deposited layer material more closely arranged, reduce voids and defects, improve the density and mechanical properties of the printed part, and improve the quality and application range of the printed part.

[0043] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not intended to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0044] In addition, the terms "installed", "connected", "linked", "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or a connection through an intermediate medium, or an internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The above content completely describes the technical solution, implementation manner, beneficial effects, principles, etc. of the present invention, aiming to provide clear and detailed technical guidance for technicians in related fields to ensure the accurate implementation and application of the present invention. At the same time, the protection scope of the present invention should cover various improvements and deformations made based on this technical idea to encourage technological innovation and development.

Claims

1. A hot rolling roll-assisted fused deposition modeling device, characterized in that, It includes a hot rolling roll mechanism (1), a hot rolling roll Y-axis moving mechanism (2), a hot rolling roll Z-axis moving mechanism (3), a nozzle (5), an FDM printer rear plate (6), a nozzle moving mechanism (7), a substrate (8), a printing platform (9), a printing platform Z-axis moving mechanism (10) and an aluminum profile frame (4); Among them, the hot rolling roll mechanism (1) is connected to the hot rolling roll Y-axis moving mechanism (2) and the hot rolling roll Z-axis moving mechanism (3) on the aluminum profile frame (4) through corresponding connecting parts; the nozzle (5) is driven by the nozzle moving mechanism (7) to move in the X and Y directions along a preset path, extrude the molten wire and deposit it on the substrate (8) or the previous deposited layer to form a new deposited layer; after the deposition is completed, the nozzle (5) returns to the origin, and the printing platform (9) moves downward along the Z-axis driven by the printing platform Z-axis moving mechanism (10) to prepare for the deposition of the next layer; after the deposited layer is formed, the hot rolling roll mechanism (1) moves a corresponding distance along the Z direction to above the deposited layer and keeps the Z-axis position unchanged driven by the hot rolling roll Z-axis moving mechanism (3), and then the hot rolling roll Y-axis moving mechanism (2) drives the hot rolling roll mechanism (1) to move along the Y-axis to apply roll pressure to the deposited layer.

2. The hot-rolling roll-assisted fused deposition modeling device according to claim 1, wherein The hot rolling roll mechanism (1) includes: a hot rolling roll (12), a slip ring (13) and a hot rolling roll bearing seat (14); the hot rolling roll (12) is connected to the hot rolling roll Y-axis moving mechanism (2) through the hot rolling roll bearing seats (14) at both ends, and the hot rolling roll mechanism (1) and the hot rolling roll Y-axis moving mechanism (2) together extend into the FDM printer and are positioned directly above the substrate (8); the heating method of the hot rolling roll (12) is electric heating, and a heating element is arranged inside it, and the electric energy transmission during the rotation of the hot rolling roll (12) is realized through the slip ring (13).

3. The hot rolling roll-assisted fused deposition modeling device according to claim 1, wherein The hot rolling roll Y-axis moving mechanism (2) includes: a hot rolling roll Y-axis stepping motor (18), a hot rolling roll Y-axis stepping motor bracket (17), a hot rolling roll Y-axis coupling (19), a hot rolling roll Y-axis transmission lead screw (20), a hot rolling roll Y-axis lead screw nut (22), a left hot rolling roll Y-axis connecting part (21), a right hot rolling roll Y-axis connecting part (25), a hot rolling roll Y-axis moving device fixed housing (23), a hot rolling roll Y-axis lead screw fixed bearing seat (24), a linear guide rail (15) and a guide rail stopper (16); among them, the hot rolling roll Y-axis moving mechanism (2) is connected to the hot rolling roll mechanism (1) through the left hot rolling roll Y-axis connecting part (21) and the right hot rolling roll Y-axis connecting part (25) and is connected by means of tightening with bolts; the rotation of the hot rolling roll Y-axis transmission lead screw (20) is driven by the hot rolling roll Y-axis stepping motor (18), and the hot rolling roll mechanism (1) is driven to perform precise linear movement along the Y-axis through the connection of the Y-axis connecting part and the lead screw nut. At the same time, the two linear guide rails (15) provide stable support and precise guidance for the movement of the hot rolling roll (12) to realize the precise movement of the hot rolling roll (12) in the Y-axis direction.

4. The hot rolling roll-assisted fused deposition modeling device according to claim 3, characterized in that, The left Y-axis connecting piece (21) and the right Y-axis connecting piece (25) of the hot rolling roll are key components connecting the hot rolling roll mechanism (1) and the hot rolling roll Y-axis moving mechanism (2); through the following connecting holes: the lead screw nut connecting hole (27), the Y-axis linear guide connecting hole (28), and the hot rolling roll connecting hole (29), they are connected by tightening bolts to realize the connection between the hot rolling roll mechanism (1) and the hot rolling roll Y-axis moving mechanism (2).

5. The hot rolling roll-assisted fused deposition modeling device according to claim 1, characterized in that, The described hot rolling roll Z-axis moving mechanism (3) includes: a hot rolling roll Z-axis stepping motor (31), a hot rolling roll Z-axis stepping motor bracket (30), a hot rolling roll Z-axis coupling (32), a hot rolling roll Z-axis T-shaped lead screw (33), a fixed seat bearing (35), a hot rolling roll Z-axis block nut (34), a guide block (16) for the linear guide, a linear guide (15), and a hot rolling roll Z-axis connecting piece (36); among them, the hot rolling roll Z-axis moving mechanism (3) is connected to the aluminum profile frame (4) through the hot rolling roll Z-axis connecting piece (36), and then connected to the hot rolling roll Y-axis moving mechanism (2), so as to realize the connection with the hot rolling roll mechanism (1); the hot rolling roll Z-axis stepping motor (31) drives the rotation of the hot rolling roll Z-axis T-shaped lead screw (33), and the power is transmitted to the hot rolling roll mechanism (1) through the hot rolling roll Z-axis block nut (34) and the hot rolling roll Z-axis connecting piece (36). At the same time, the linear guides (15) on both sides provide stable support and accurate guidance for the movement of the hot rolling roll mechanism (1) in the Z-axis direction, ensuring that the hot rolling roll (12) moves accurately and stably in the Z-axis direction to meet the printing layers and printing requirements at different heights.

6. The hot rolling roll-assisted fused deposition modeling device according to claim 5, wherein, The described hot rolling roll Z-axis connecting piece (36) is a key component connecting the hot rolling roll Z-axis moving mechanism (3) and the hot rolling roll Y-axis moving mechanism (2); it is connected through the following connecting holes: the Z-axis linear guide connecting hole (37) and the Y-axis moving mechanism connecting hole (38), and is connected by tightening bolts to realize the connection between the hot rolling roll Z-axis moving mechanism (3), the hot rolling roll Y-axis moving mechanism (2), and the hot rolling roll mechanism (1).

7. An auxiliary fused deposition modeling device for a hot rolling roll according to claim 1, characterized in that, The described nozzle (5) includes: a wire feeding mechanism (51), a heat dissipation mechanism (52), a heat dissipation fan (53), a heating mechanism (54), a nozzle (55), a optical axis connection hole (56), a nozzle and synchronous belt connection hole (57), a nozzle back plate (58), and a nozzle housing (59); among them, the nozzle housing (59) not only plays a role in protecting and fixing the internal components, but also jointly forms a connection structure between the nozzle (5) and the nozzle movement mechanism (7) with the nozzle back plate (58); specifically, the nozzle housing (59) and the nozzle back plate (58) are mutually buckled to form the optical axis connection hole (56) and the nozzle and synchronous belt connection hole (57); through these two connection holes, the nozzle (5) is connected to the nozzle movement optical axis (50), the upper synchronous belt (44), and the lower synchronous belt (47) on the nozzle movement mechanism (7), so as to realize the precise movement control of the nozzle in the X and Y directions; the wire feeding mechanism (51) is responsible for precisely feeding the wire to the nozzle (55); the heating mechanism (54) heats the wire to a molten state and extrudes it through the nozzle (55); the heat dissipation mechanism (52) and the heat dissipation fan (53) ensure the stability of the nozzle under high-temperature working conditions.

8. The auxiliary fused deposition modeling device for hot rolling rolls according to claim 1, characterized in that, The described nozzle movement mechanism (7) includes: an upper synchronous belt (44), a synchronous pulley (45), a nozzle movement mechanism stepping motor (46), a lower synchronous belt (47), an optical axis fixing seat (48), an optical axis linear bearing (49), and a nozzle movement optical axis (50); among them, the nozzle movement mechanism stepping motor (46) is connected to the upper synchronous belt (44) and the lower synchronous belt (47) through the synchronous pulley (45) and the optical axis fixing seat (48) to form a complete synchronous belt drive system; the nozzle movement optical axis (50) is installed on the optical axis fixing seat (48) through the optical axis linear bearing (49) to provide support and guidance for the movement of the nozzle in the X and Y directions; the nozzle (5) is connected to the nozzle movement optical axis (50) and the synchronous belt drive system through the optical axis connection hole (56) and the nozzle and synchronous belt connection hole (57), so as to realize the precise movement control of the nozzle in the X and Y directions under the drive of the nozzle movement mechanism stepping motor (46).

9. The hot rolling roll-assisted fused deposition modeling device according to claim 1, wherein The described printing platform Z-axis moving mechanism (10) includes: a linear bearing (39), a printing platform Z-axis moving lead screw (40), a printing platform Z-axis stepping motor (41), a printing platform Z-axis fixed seat (42), and a printing platform Z-axis moving optical axis (43); among them, the printing platform Z-axis stepping motor (41) serves as a power source, and by driving the rotation of the printing platform Z-axis moving lead screw (40), drives the printing platform (9) to move up and down along the Z-axis direction; the printing platform Z-axis moving optical axis (43) is installed on the printing platform (9) through the linear bearing (39), providing high-precision linear motion guidance for the printing platform (9), ensuring that the printing platform (9) remains stable and precise during the movement; the upper parts of the printing platform Z-axis moving lead screw (40) and the printing platform Z-axis moving optical axis (43) are fixed on the printing platform Z-axis fixed seat (42), and the lower parts are fixed on the FDM printer base (11), ensuring their installation accuracy and stability.

Images