CN109094016B - Fiber shearing method and device for 3D printing of continuous fiber reinforced composite material - Google Patents
Fiber shearing method and device for 3D printing of continuous fiber reinforced composite material Download PDFInfo
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- CN109094016B CN109094016B CN201811199083.6A CN201811199083A CN109094016B CN 109094016 B CN109094016 B CN 109094016B CN 201811199083 A CN201811199083 A CN 201811199083A CN 109094016 B CN109094016 B CN 109094016B
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- 238000010008 shearing Methods 0.000 title claims abstract description 97
- 239000000835 fiber Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000010146 3D printing Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 title claims abstract description 28
- 239000003733 fiber-reinforced composite Substances 0.000 title claims abstract description 23
- 238000003825 pressing Methods 0.000 claims abstract description 104
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 claims abstract description 29
- 238000007639 printing Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 abstract description 11
- 239000011208 reinforced composite material Substances 0.000 abstract description 5
- 230000033001 locomotion Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 208000006011 Stroke Diseases 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/118—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using filamentary material being melted, e.g. fused deposition modelling [FDM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/227—Driving means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
Abstract
The invention provides a fiber shearing method and a device for 3D printing of a continuous fiber reinforced composite material, wherein the method comprises the following steps: moving the printhead carriage upward; starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block; the second power unit is rotated to drive the cam to rotate, and the right pressing block and the left pressing block clamp the fibers under the pushing of the ejector rod and the first spring; after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; the printhead carriage moves downward to reset. The technical problems that the existing shearing device is poor in reliability and limited in applicable material range and has high requirements on calculation and control precision in the printing process are solved, and the technical effects of improving the efficiency and stability of printing the reinforced composite material, reducing the requirements on calculation and control precision and saving cost are achieved.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a fiber shearing method and device for 3D printing of a continuous fiber reinforced composite material.
Background
The continuous fiber reinforced composite material has the advantages of high specific strength, high specific modulus, strong designability, functionality (such as wave absorption and heat insulation) and the like, and is widely applied to the fields of aerospace, high-speed trains, ships and the like. The traditional continuous fiber reinforced composite material manufacturing process, such as winding forming process, automatic laying process, braiding process and the like, requires a die in the manufacturing process, has high cost and long period, can not manufacture complex continuous fiber reinforced composite material parts, and greatly limits the application of the continuous fiber reinforced composite material. In recent years, with the advent of a 3D printing process for a continuous fiber reinforced composite material, not only is the manufacturing cost of the continuous fiber reinforced composite material reduced, but also the manufacturing efficiency thereof is effectively improved.
However, the existing shearing device on the 3D printer has the technical problems of poor reliability, limited applicable material range and high calculation and control precision requirements on the printing process.
Disclosure of Invention
In a first aspect, embodiments of the present invention provide a fiber shearing method for 3D printing of a continuous fiber reinforced composite, the method comprising: moving the printhead carriage upward; starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block; the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter; after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting.
Preferably, before the printhead carriage is moved up, the method includes: the shear unit is set in a raised state when printing is performed.
Preferably, the rotating the second power unit drives the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the spring, and the fiber collides with the cutter, and the fiber feeding device comprises: the cam rotates to push the ejector rod to move leftwards; the right pressing block arranged on the ejector rod moves leftwards to be in contact with the left pressing block; the left pressing block presses the right pressing block under the pushing of the first spring, presses the second spring and clamps the fiber.
Preferably, the completing the resetting of the shearing unit includes: and the second spring is reset to enable the reset bolt to drive the right pressing block to move rightwards.
In a second aspect, embodiments of the present invention provide a fiber shearing apparatus for 3D printing of a continuous fiber reinforced composite material, the apparatus comprising: a printhead carriage; a first power unit disposed on a lower end of the printhead bracket; the coupling unit is arranged at the power output end of the first power unit and is connected with the shearing bracket; a shear unit connected with the shear support, and comprising: a push rod; the right pressing block is connected with the ejector rod at one end, and is provided with a first central through hole, wherein the ejector rod can push the right pressing block to move leftwards; the left pressing block is provided with a second center through hole, the left pressing block and the right pressing block are arranged opposite to each other, and a preset distance is reserved between the left pressing block and the right pressing block; the first spring is connected with one end of the left pressing block; the second spring is connected with the right pressing block; the cutter is arranged in the second central through hole and can penetrate into the first central through hole; the second power unit is connected with the shearing bracket; the cam is arranged on the shearing bracket and is connected with the power output end of the second power unit; and the 3D printing head is arranged on the printing head bracket, and the 3D printing head is arranged above the shearing unit.
Preferably, the first power unit can drive the shearing support and the coupling unit to perform rotary motion.
Preferably, the shearing unit further comprises: the left fixing bracket is arranged on the shearing bracket; the adjusting bolt is in sliding connection with the left fixing support, the adjusting bolt is fixedly connected with the left pressing block, and the first spring is sleeved on the outer surface of the adjusting bolt.
Preferably, the shearing unit further comprises: the right fixing support and the left fixing support are oppositely arranged on the shearing support, and the right fixing support is in sliding connection with the ejector rod; the reset screw is in sliding connection with the right fixed support, and the reset screw is connected with the right pressing block, and the second spring is sleeved on the outer surface of the reset screw.
Preferably, the shearing unit further comprises: the driving wheel is connected with the ejector rod, and the driving wheel is connected with the cam in a sliding manner, wherein the cam rotates to drive the driving wheel to rotate and push the ejector rod to move leftwards.
Preferably, the shearing unit further comprises: and the heating unit is connected with one end of the cutter.
The above technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a fiber shearing method for 3D printing of a continuous fiber reinforced composite material, which comprises the following steps: moving the printhead carriage upward; starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block; the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter; after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting. The invention solves the technical problems of poor reliability, limited applicable material range and high calculation and control precision requirements for the printing process of the traditional shearing device, and achieves the technical effects of improving the efficiency and stability of the printing of the reinforced composite material, reducing the requirements on calculation and control precision and saving the cost.
2. According to the embodiment of the invention, the cam is driven to rotate by the second rotating power unit, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the spring, and the fiber collides with the cutter, and the device comprises: the cam rotates to push the ejector rod to move leftwards; the right pressing block arranged on the ejector rod moves leftwards to be in contact with the left pressing block; the left pressing block presses the right pressing block under the pushing of the first spring, presses the second spring and clamps the fiber. Further achieves the technical effects of accurately shearing and ensuring the 3D printing efficiency.
3. The embodiment of the invention resets through the completion shearing unit, and comprises the following steps: and the second spring is reset to enable the reset bolt to drive the right pressing block to move rightwards. Further achieves the technical effect of automatic reset after finishing shearing and ensuring the continuity of 3D printing.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present specification in order that the technical means of the invention may be more clearly understood, and in order that the above-mentioned and other objects, features and advantages of the invention may be more readily understood, the following detailed description of the invention.
Drawings
Fig. 1 is a schematic view of a shear state structure of a fiber shearing device for 3D printing of a continuous fiber reinforced composite material according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a lifting state structure of a fiber shearing device for 3D printing of a continuous fiber reinforced composite material according to an embodiment of the present invention;
fig. 3 is a schematic view of a cutting unit structure of a fiber cutting device for 3D printing of a continuous fiber reinforced composite material according to an embodiment of the present invention;
fig. 4 is a flow chart of a fiber shearing method for 3D printing of a continuous fiber reinforced composite material according to an embodiment of the present invention.
Reference numerals illustrate: a printhead carriage 1; a first power unit 2; a shear support 3; a 3D printhead 4; a shearing unit 5; an adjusting bolt 51; a first spring 52; a left press block 53; a right press block 54; a right fixing bracket 55; a second spring 56; a reset screw 57; a left fixed bracket 58; an adjusting bolt 59; a heating unit 510; a cutter 511; a jack 512; a wheel 513; a fiber 6; a coupling unit 7; a second power unit 8; and a cam 9.
Detailed Description
The embodiment of the invention solves the technical problems of poor reliability, limited applicable material range and high calculation and control precision requirements on the printing process of the traditional shearing device by providing the fiber shearing method and the device for 3D printing of the continuous fiber reinforced composite material, and achieves the technical effects of improving the printing efficiency and stability of the reinforced composite material, reducing the calculation and control precision requirements and saving the cost.
The technical scheme in the embodiment of the invention has the following overall thought: moving the printhead carriage upward; starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block; the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter; after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting. The invention solves the technical problems of poor reliability, limited applicable material range and high calculation and control precision requirements for the printing process of the traditional shearing device, and achieves the technical effects of improving the efficiency and stability of the printing of the reinforced composite material, reducing the requirements on calculation and control precision and saving the cost.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides a fiber shearing method for 3D printing of a continuous fiber reinforced composite material, which is shown in figures 1-4 and comprises the following steps:
step 110: moving the printhead carriage upward; further, before the printhead carrier is moved up, the method includes: the shear unit is set in a raised state when printing is performed.
Specifically, during printing, the cutting unit is in a raised state, and when the fiber cutting operation needs to be performed, the print head bracket moves upwards, and the cutting unit mounted on the print head bracket is lifted along with the upward movement.
Step 120: starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block;
specifically, after the shearing unit is lifted, the first power unit drives the coupling unit and the shearing support to swing downwards, and the shearing unit and the second power unit which are arranged on the shearing support swing downwards along with the shearing support, so that fibers enter between the left pressing block and the right pressing block.
Step 130: the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter; further, rotate the second power unit drives the cam and rotates, under the promotion of ejector pin and spring right briquetting with left briquetting centre gripping fibre, the fibre hits to the cutter, includes: the cam rotates to push the ejector rod to move leftwards; the right pressing block arranged on the ejector rod moves leftwards to be in contact with the left pressing block; the left pressing block presses the right pressing block under the pushing of the first spring, presses the second spring and clamps the fiber.
Specifically, after the fiber enters between left briquetting and the right briquetting, the second power unit starts rotating, drives the cam to rotate and enters the stroke stage, the right briquetting fixed on the ejector rod moves leftwards along with the ejector rod, so that the left briquetting contacts with the right briquetting, the right briquetting continues to move leftwards, under the action of the first spring, the left briquetting and the right briquetting firmly clamp the fiber, and meanwhile the fiber is impacted to the cutter, so that the aim of cutting the fiber is fulfilled, and at the moment, the second spring is pressed to clamp the fiber.
Step 140: after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; further, the completing the resetting of the shearing unit includes: and the second spring is reset to enable the reset bolt to drive the right pressing block to move rightwards.
Specifically, after the fiber is sheared, the second power unit resets, the cam is driven to enter a short-range repose angle stage, the second spring resets to enable the reset bolt to drive the right pressing block to move rightwards, and reset of the shearing unit is completed.
Step 150: the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting.
Specifically, after the shearing unit resets, the first power unit resets to drive the coupling unit and the shearing support to swing upwards, the whole fiber shearing device is reset, and then the printing head support moves downwards to continue printing tasks.
Example two
As shown in fig. 2-4, the present invention also provides a fiber cutting apparatus for 3D printing of a continuous fiber reinforced composite material, the apparatus comprising:
a printhead carriage 1; further, the device further comprises: a 3D printhead 4, the 3D printhead 4 being arranged on the printhead carrier 1, and the 3D printhead 4 being above the shear unit 5.
Specifically, the 3D printhead 4 is disposed on the printhead holder 1, and the printhead holder 1 supports the 3D printhead 4 and suspends the 3D printhead 4 above the cutting unit 5.
A first power unit 2, the first power unit 2 being provided on a lower surface of the head carriage 1; further, the first power unit 2 may move to drive the shear bracket 1 and the coupling unit 7 to perform a rotational movement.
Specifically, the first power unit 2 is connected with the lower surface of the print head bracket 1, and after the first power unit 2 is opened, the shear bracket 3 and the coupling unit 7 connected with the first power unit can be driven to rotate together, so that the coupling unit 7 and the shear bracket 3 swing downwards.
A coupling unit 7, wherein the coupling unit 7 is arranged on the power output end of the first power unit 2, and the coupling unit 7 is connected with the shearing bracket 3;
specifically, the coupling unit 7 is connected to the power output end of the first power unit 2, and the coupling unit 7 is a power transmission device, which means a device that connects two shafts or the shaft and a rotating member to rotate together in the process of transmitting motion and power, and is not disengaged under normal conditions. Sometimes also used as a safety device for preventing the connected parts from bearing excessive load, and playing an overload protection role. The coupling unit 7 can transmit the power of the first power unit 2 to the shearing support 3 to drive the shearing support 3 to move together.
A shearing unit 5, the shearing unit 5 being connected to the shearing support 3, and the shearing unit 5 comprising: a jack 512; further, the shearing unit 5 further includes: a left fixing bracket 58, the left fixing bracket 58 being provided on the shear bracket 3; the adjusting bolt 51, the adjusting bolt 51 with left fixed bolster 58 sliding connection, just adjusting bolt 51 with left briquetting 53 fixed connection, the cover has on the surface of adjusting bolt 51 first spring 52. Further, the shearing unit 5 further includes: a right fixing bracket 55, wherein the right fixing bracket 55 and the left fixing bracket 58 are oppositely arranged on the shearing bracket 3, and the right fixing bracket 55 is in sliding connection with the ejector rod 512; the reset screw 57 is slidably connected with the right fixing bracket 55, the reset screw 57 is connected with the right pressing block 54, and the second spring 56 is sleeved on the outer surface of the reset screw 57; and a driving wheel 513, wherein the driving wheel 513 is connected with the push rod 512, and the driving wheel 513 is slidably connected with the cam 9, and the cam 9 rotates to drive the driving wheel 513 to rotate and push the push rod 512 to move leftwards. The shearing unit 5 further comprises: a right pressing block 54, one end of the right pressing block 54 is connected with the push rod 512, and the right pressing block 54 is provided with a first central through hole, wherein the push rod 512 can push the right pressing block 54 to move leftwards; a left press block 53, wherein the left press block 53 is provided with a second central through hole, the left press block 53 is arranged opposite to the right press block 54, and a preset distance is arranged between the left press block 53 and the right press block 54; the left pressing block is a left pressing block in the direction of fig. 3, and the right pressing block is a right pressing block in the direction of fig. 3. A first spring 52, wherein the first spring 52 is connected with one end of the left pressing block 53; a second spring 56, the second spring 56 being connected to the right pressing block 54; a cutter 511, the cutter 511 being disposed within the second central through hole, and the cutter 511 being penetratable into the first central through hole; a second power unit 8, the second power unit 8 is connected with the shearing bracket 3.
Specifically, the shearing unit 5 includes an adjusting bolt 51, a first spring 52, a left pressing block 53, a right pressing block 54, a right fixing bracket 55, a second spring 56, a reset screw 57, a left fixing bracket 58, an adjusting bolt 59, a heating device 510, a cutter 511, a push rod 512 and a driving wheel 513. The left fixing support 58 and the right fixing support 55 are oppositely arranged and are fixed on the shearing support 3 with the heating device 510, the two adjusting bolts 51 are in sliding connection with the left fixing support 58, the first springs 52 are sleeved on the two adjusting bolts 51 respectively, the left pressing block 53 is fixed on the two adjusting bolts 51, the reset screw 57 is in sliding connection with the right fixing support 55, the ejector rod 512 is in sliding connection with the right fixing support 55, the driving wheel 513 is connected with the ejector rod 512 and is in sliding connection with the cam 9, the cam 9 is fixed on the second power unit 8, the cam 9 can rotate along with the second power unit 8, the ejector rod 512 drives the right pressing block 54 to move leftwards, central through holes are reserved on the left pressing block 53 and the right pressing block 54, and the cutter 511 can cut the fiber 6 by moving in the two central through holes. The reset screw 57 is slidably connected with the right fixing bracket 55, the right pressing block 54 is connected with the reset screw 57, the second spring 56 is pressed in the process that the right pressing block 54 moves leftwards, and when the cam 9 returns to a short-range repose angle, the right pressing block 54 completes reset action under the action of the second spring 56.
And a heating unit 510, wherein the heating unit 510 is connected with one end of the cutter 511.
Specifically, the heating unit 510 may use electric heating, where the electric heating can directly generate heat inside the heated object, so that the heating efficiency is high, the heating speed is fast, and according to the heating process requirement, the whole uniform heating or the local heating (including surface heating) can be realized, and the vacuum heating and the atmosphere control heating can be easily realized. In the electric heating process, the generated waste gas, residue and smoke dust are less, the heated object can be kept clean, and the environment is not polluted. Therefore, electric heating is widely used in the fields of production, scientific research, experiments, and the like. The cutter 511 can be heated by the heating unit 510, thereby facilitating cutting of the printing material such as the fiber 6.
And a cam 9, wherein the cam 9 is arranged on the shearing bracket 3, and the cam 9 is connected with the power output end of the second power unit 8.
In particular, the cam 9 is a member with a curved surface or curved groove, by means of which the other component, the follower, can be made to provide a predetermined movement. The path of the secondary mover is largely limited in a chute to obtain the reciprocating motion. In the return stroke, the weight of the mechanism is sometimes relied on, but in order to obtain a definite action, a spring is often used as a return force, and a guide groove is used to enable the mechanism to move on a specific path.
The above technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. a fiber shearing method for continuous fiber reinforced composite 3D printing, the method comprising: moving the printhead carriage upward; starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block; the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter; after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed; the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting. The invention solves the technical problems of poor reliability, limited applicable material range and high calculation and control precision requirements for the printing process of the traditional shearing device, and achieves the technical effects of improving the efficiency and stability of the printing of the reinforced composite material, reducing the requirements on calculation and control precision and saving the cost.
2. According to the embodiment of the invention, the second power unit rotates to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the spring, and the fiber collides with the cutter, and the device comprises: the cam rotates to push the ejector rod to move leftwards; the right pressing block arranged on the ejector rod moves leftwards to be in contact with the left pressing block; the left pressing block presses the right pressing block under the pushing of the first spring, presses the second spring and clamps the fiber. Further achieves the technical effects of accurately shearing and ensuring the 3D printing efficiency.
3. The embodiment of the invention resets through the completion shearing unit, and comprises the following steps: and the second spring is reset to enable the reset bolt to drive the right pressing block to move rightwards. Further achieves the technical effect of automatic reset after finishing shearing and ensuring the continuity of 3D printing.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A fiber cutting method for 3D printing of a continuous fiber reinforced composite material, the method being applied to a fiber cutting apparatus for 3D printing of a continuous fiber reinforced composite material, the apparatus comprising:
a printhead carriage;
a first power unit disposed on a lower end of the printhead bracket;
the coupling unit is arranged at the power output end of the first power unit and is connected with the shearing bracket;
a shear unit connected with the shear support, and comprising:
a push rod;
the right pressing block is connected with the ejector rod at one end, and is provided with a first central through hole, wherein the ejector rod can push the right pressing block to move leftwards;
the left pressing block is provided with a second center through hole, the left pressing block and the right pressing block are arranged opposite to each other, and a preset distance is reserved between the left pressing block and the right pressing block;
the first spring is connected with one end of the left pressing block;
the second spring is connected with the right pressing block;
the cutter is arranged in the second central through hole and can penetrate into the first central through hole;
the second power unit is connected with the shearing bracket;
the cam is arranged on the shearing bracket and is connected with the power output end of the second power unit;
a 3D printhead, the 3D printhead being disposed on the printhead mount, and the 3D printhead being above the shear unit;
the first power unit drives the shearing support and the coupling unit to rotate through rotation of the power output end;
the shear unit further comprises:
the left fixing bracket is arranged on the shearing bracket;
the adjusting bolt is in sliding connection with the left fixing support, and is fixedly connected with the left pressing block, and the first spring is sleeved on the outer surface of the adjusting bolt;
the right fixing support and the left fixing support are oppositely arranged on the shearing support, and the right fixing support is in sliding connection with the ejector rod;
the reset screw is in sliding connection with the right fixed support, the reset screw is connected with the right pressing block, and the second spring is sleeved on the outer surface of the reset screw;
the driving wheel is connected with the ejector rod and is in sliding connection with the cam, and the cam rotates to drive the driving wheel to rotate and push the ejector rod to move leftwards;
the heating unit is connected with one end of the cutter;
the method comprises the following steps:
moving the printhead carriage upward;
starting the first power unit to drive the coupling unit, the shearing support, the shearing unit and the second power unit to move downwards, and leading out fibers in the 3D printing head to enter between the left pressing block and the right pressing block;
the second power unit is rotated to drive the cam to rotate, the right pressing block and the left pressing block clamp the fiber under the pushing of the ejector rod and the first spring, and the fiber collides with the cutter;
after the fibers are sheared, the second power unit resets to drive the cam to enter a process repose angle stage, and resetting of the shearing unit is completed;
the first power unit resets and drives the coupling unit and the shearing support to move upwards for resetting, and the printing head support moves downwards for resetting.
2. The fiber cutting method of claim 1, wherein prior to moving the printhead carriage up, comprising:
the shear unit is set in a raised state when printing is performed.
3. The fiber shearing method as set forth in claim 1, wherein said rotating said second power unit rotates said cam, said right press block and said left press block holding said fiber under the urging of said jack and said spring, said fiber striking said cutter, comprising:
the cam rotates to push the ejector rod to move leftwards;
the right pressing block arranged on the ejector rod moves leftwards to be in contact with the left pressing block;
the left pressing block presses the right pressing block under the pushing of the first spring, presses the second spring and clamps the fiber.
4. A fiber cutting process according to claim 3, wherein the completion of cutting unit reset comprises:
and the second spring is reset to enable the reset bolt to drive the right pressing block to move rightwards.
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