Retractable wire surface online cleaning device and method for wire feeding additive technology

Abstract

The invention discloses a retractable wire surface online cleaning device and method of a wire feeding and material increasing technology. A metal wire is fed into a wire cleaning device to achieve online cleaning of the metal wire; the wire cleaning device comprises a connecting base, a sleeve and a polishing cutter; the outer end face of the connecting base fixing wire cleaning device is connected with a grinding tool. Sawtooth-shaped grinding teeth are arranged on the inner wall of the grinding tool. The grinding cutter is composed of three arc-shaped cutters and an elastic connecting part; the outer surfaces of the two arc-shaped cutters at the upper end are provided with baffles; the sleeve is connected between the connecting base and the grinding tool in a sleeving mode and can move along the outer surfaces of the connecting base and the grinding tool, so that the elastic connecting part is in a loose or tight state, when the elastic connecting part becomes small and tightened, the grinding process is started, and metal chips generated in the grinding process fall down from the groove of the grooved arc-shaped tool at the lower end. The wire cleaning device is arranged on the wire feeding channel, so that the procedure of wire cleaning can be simplified, and improvement of existing equipment is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal additive manufacturing, in particular to a retraction type online cleaning device and method for wire surface of wire feeding additive manufacturing technology. BACKGROUND

[0002] Metal additive manufacturing technology is an advanced digital manufacturing technology that uses high-energy heat sources to accumulate and manufacture metals. Metal additive manufacturing technology using wire as raw material is collectively referred to as metal wire feeding additive manufacturing technology. Through high-energy heat sources such as electric arc, laser or ultrasonic, the metal wire is melted and then deposited layer by layer to form a shape. This technology has the advantages of high forming efficiency, high material utilization rate, and relatively controllable equipment cost, and has been applied in high-end industrial fields such as aerospace, rail transportation, and energy equipment.

[0003] In wire feeding additive manufacturing, the surface quality of the metal wire affects the process stability and the performance of the final product. If the wire surface is attached with oxidation scale, oil stains, environmental dust and other pollutants, under the action of high temperature energy field, the pollutants will decompose or melt into the molten pool, which is easy to cause metallurgical defects such as pores, inclusions and cracks, resulting in a decrease in the density of the deposited part and a deterioration of the mechanical properties (such as tensile strength and impact toughness). In severe cases, it can even cause energy field fluctuations and interrupt the forming process. Therefore, the wire cleaning technology is a key pre-process to ensure the stability of the wire feeding additive manufacturing process, and its core requirement is to ensure that the surface of the wire meets the cleanliness standard before entering the energy field action area.

[0004] In wire feeding additive manufacturing, metal wires are exposed to air for a long time due to production environment and progress requirements, which can easily cause oxidation and contamination. Contaminated wire can cause pores, inclusions and other defects during wire feeding additive manufacturing, affecting the density and mechanical properties of the deposited part. In order to form a good workpiece, the wire needs to be effectively cleaned before it enters the energy field action area. In wire feeding additive manufacturing, existing wire cleaning is mostly in offline mode, which not only has low efficiency and is difficult to match the continuous production rhythm, but also can easily cause secondary pollution during the transfer and clamping of the cleaned wire, affecting the effect of the previous cleaning. To avoid secondary pollution, the synchronization of wire cleaning and wire feeding process needs to be realized. When forming metal components of different specifications or materials, the cleaning mechanism needs to ensure efficient removal of contaminants on the surface of the wire while not interfering with the precision of the wire feeding (such as wire feeding speed and centering), to ensure the stability of the metal molten pool, and to make the cleaning function and wire feeding system adapt to each other. SUMMARY

[0005] 1. The technical problem to be solved is: In view of the above technical problems, the present application provides a retraction type online cleaning device and method for wire surface of wire feeding additive manufacturing technology.

[0006] 2. Technical solution: An online cleaning device for the surface of a wire in a wire feeding additive manufacturing technology, which cleans the wire and then feeds it into a nozzle for subsequent additive manufacturing; characterized in that a wire feeding gear set and a wire cleaning device are arranged in the wire feeding channel of the wire; the wire feeding gear set provides power for the wire feeding; the wire cleaning device is provided with a grinding tool; the wire is cleaned online by the grinding tool in the wire cleaning device during the wire feeding process, and finally reaches the nozzle for manufacturing; the wire cleaning device is at least one set; The wire cleaning device comprises a connecting base, a sleeve and a grinding tool; the connecting base is used for fixing the wire cleaning device and is in the form of a hollow cylinder, the outer end surface of the hollow cylinder is connected to the cylindrical grinding tool along the extension direction of the cylinder; the inner wall of the grinding tool is provided with sawtooth-shaped grinding teeth; the grinding tool comprises three arc-shaped tools which are the same as the extension direction of the connecting base, and elastic connecting parts are arranged between adjacent arc-shaped tools; among the three arc-shaped tools, the arc-shaped tool at the lower end is slotted, and the outer surfaces of the two arc-shaped tools at the upper end are provided with baffles; the hollow channel formed by the grinding tool is in interference fit with the passing wire; the cavities of the connecting base and the grinding tool are through to form a wire feeding channel; the sleeve is sleeved on the intermediate position between the connecting base and the grinding tool and can move along the outer surfaces of the two; when the sleeve moves to the end of the connecting base, the elastic connecting parts between the three arc-shaped tools are in a relaxed state; when the sleeve moves to the end of the grinding tool, the elastic connecting parts between the arc-shaped tools become smaller and tighten to enter the grinding process, and the metal chips generated in the grinding process fall through the slot of the slotted arc-shaped tool at the lower end.

[0007] Further, the wire feeding gear set comprises wire feeding gears connected by meshing, and wire feeding grooves are arranged between the wire feeding gears.

[0008] Further, the central angle of each arc-shaped tool is 110°, and the central angle corresponding to each elastic connecting part is 10°; the elastic connecting parts are made of a high-elasticity modulus alloy with fatigue resistance.

[0009] Further, the outer surface of the wire cleaning device is also provided with a scrap collecting box for collecting the metal chips generated by the grinding tool.

[0010] Further, the movement of the sleeve on the surface of the connecting base and the grinding tool is driven by a motor and a crank slider mechanism; the output shaft of the motor drives the movement of the crank slider mechanism, and the crank slider mechanism is fixedly connected to the surface of the sleeve to drive the movement of the sleeve.

[0011] Further, the connecting base and the grinding tool are both provided with a limiting baffle for limiting the movement position of the sleeve.

[0012] The application discloses a retraction type wire surface online cleaning method for realizing a wire feeding additive technology.

[0013] 3. Beneficial effects: (1) The retraction type wire surface online cleaning device for the wire feeding additive technology disclosed by the application is provided with the wire cleaning device in the wire feeding channel, so that the wire cleaning process can be simplified, and the existing equipment can be improved.

[0014] (2) In the retraction type wire surface online cleaning device for the wire feeding additive technology, the polishing cutter of the wire cleaning device is arranged in the wire feeding channel, the surface of the metal wire passing through the polishing channel of the polishing cutter can be directly polished and then enter the next process, so that the possibility of the wire being polluted after the surface cleaning is reduced to the maximum, and the stability of the metal molten pool can be ensured without disturbing the wire conveying precision.

[0015] (3) In the retraction type wire surface online cleaning device for the wire feeding additive technology, the size of the polishing cutter and the number of the wire cleaning device can be selected and adjusted according to the actual wire size, material type, use environment and other specific working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a whole schematic view of the retraction type wire surface online cleaning device for the wire feeding additive technology; Figure 2 Fig. 2 is an external view of the wire cleaning device in the application; Figure 3 Fig. 3 is a front view of the wire cleaning device in the application; Figure 4 Fig. 4 is a sectional view of the polishing cutter in the application; Figure 5 Fig. 5 is a schematic view of the arc-shaped cutter with a baffle in the polishing cutter in the application.

[0017] Fig. 1 is a whole schematic view of the retraction type wire surface online cleaning device for the wire feeding additive technology; DETAILED DESCRIPTION

[0018] The application will be specifically described below in combination with the drawings.

[0019] As shown in the drawings Figure 1 to the drawings Figure 5As shown, an online cleaning device for the surface of the wire of a wire feeding additive manufacturing technology, the metal wire 1 is cleaned through the device and then fed into the nozzle for subsequent additive manufacturing; characterized in that: a wire feeding gear set 2 and a wire cleaning device 6 are arranged in the wire feeding channel of the metal wire; the wire feeding gear set provides power for the feeding of the metal wire; the wire cleaning device is provided with a grinding tool, and the metal wire is cleaned online by the grinding tool of the cleaning device during the feeding process, and finally reaches the nozzle for manufacturing; the wire cleaning device is at least one set. The wire cleaning device includes a connecting base 8, a sleeve 9, and a grinding tool 10; the connecting base is used to fix the wire cleaning device and is a hollow cylinder, and the outer end surface of the hollow cylinder is connected to the cylindrical grinding tool along the extension direction of the cylinder; the inner wall of the grinding tool is provided with sawtooth-shaped grinding teeth; the grinding tool is composed of three arc-shaped tools which have the same extension direction as the connecting base, and the adjacent arc-shaped tools are provided with elastic connecting parts 13; among the three arc-shaped tools, the arc-shaped tool at the lower end is slotted, and the outer surfaces of the two arc-shaped tools at the upper end are provided with baffles 15; the hollow channel formed by the grinding tool is in interference fit with the passing metal wire; the cavities of the connecting base and the grinding tool are connected to form a wire feeding channel for the metal wire; the sleeve is sleeved on the intermediate position between the connecting base and the grinding tool and can move along the outer surfaces of the two, and when the sleeve moves to the end of the connecting base, the elastic connecting parts between the three arc-shaped tools are in a relaxed state, and when the sleeve moves to the end of the grinding tool, the elastic connecting parts between the arc-shaped tools become smaller and tighten to enter the grinding process, and the metal chips generated in the grinding process fall through the slot of the slotted arc-shaped tool at the lower end.

[0020] Further, the wire feeding gear set includes meshing wire feeding gears, and a wire feeding groove is arranged between the wire feeding gears.

[0021] Further, the central angle of each arc-shaped tool is 110°, and the corresponding central angle of each elastic connecting part is 10°; the elastic connecting part is made of a high-elasticity modulus alloy with fatigue resistance.

[0022] Further, the outer surface of the wire cleaning device is also provided with a scrap collecting box 7 for collecting the metal chips generated by the grinding tool.

[0023] Further, the movement of the sleeve on the surface of the connecting base and the grinding tool is driven by a motor 4 and a crank slider mechanism 5; wherein the output shaft of the motor drives the movement of the crank slider mechanism, and the crank slider mechanism is fixedly connected to the surface of the sleeve to drive the movement of the sleeve.

[0024] Further, the connecting base and the grinding tool are both provided with a limiting baffle for limiting the movement position of the sleeve.

[0025] A kind of realization of wire feeding additive technology, the method for cleaning wire surface on line, including: metal wire is sequentially passed through the wire feeding slot of wire feeding gear set, the wire feeding cavity of cleaning device, and according to the cleaning difficulty of metal wire surface impurity / pollution, increase cleaning device.

[0026] Embodiments: As shown in the accompanying Figure 1 , 2 , the material feeding process of wire feeding additive technology is that metal wire is sent into nozzle by wire feeding gear set for subsequent additive manufacturing;In the process of wire feeding, it is necessary to clean the wire before it enters the field effect area, and the present embodiment uses the cleaning device as shown in the accompanying Figure 1 To clean in the process of wire feeding, two groups of cleaning devices are used in the figure to achieve processing.

[0027] As shown in the accompanying Figure 2 , it is the external view of the cleaning device in the present embodiment;The output shaft of motor rotates to drive the crank slider mechanism to rotate, thereby driving the sleeve to slide along the connecting base and the outer surface of polishing cutter, so as to control the relaxation or tightening of polishing cutter.

[0028] As shown in the accompanying Figure 3 , 4 , it is a schematic diagram of the cleaning device of the present embodiment;As shown in the figure, the cleaning device is sequentially arranged from left to right as base, polishing cutter;The surface between the base and the polishing cutter is provided with a sleeve capable of sliding on the surface of the base and the polishing cutter;When not polishing (such as feeding wire), the sleeve slides to the surface of the base, and the polishing cutter is in a relaxed state, so that the metal wire will not be cleaned when passing through the polishing cutter;When polishing, the sleeve is connected to the surface of the polishing cutter under the action of the motor and the crank slider mechanism connected thereto, the distance between the three fan-shaped blades of each group of blades becomes smaller, and the metal wire and the blades are in interference fit to clean the metal surface. Figure 4 11 is an arc-shaped cutter with baffle, 12 is a slotted arc-shaped cutter, and 13 is an elastic connecting part.

[0029] As shown in the accompanying Figure 5 , (a) is the external view of the arc-shaped cutter with baffle, and (b) is the structural schematic diagram of the reverse side thereof. The whole polishing cutter is composed of arc-shaped cutters and elastic structures alternately spliced;When not stressed, the central angle of each arc-shaped blade is 110° (marked as 110° in the figure), the central angle of the elastic connecting part between adjacent two blades is 10°, and the width of the sawtooth-shaped polishing part is 2mm (marked as 2 in the figure). In order to facilitate the falling of metal chips from the polishing cutter, grooves are provided between adjacent two groups of blades, and in order to facilitate the collection of metal chips in the polishing process, a scrap collecting box is arranged under the polishing tool for collecting metal chips.

[0030] Although the present application has been disclosed in its preferred embodiments with reference to the accompanying drawings, it is not intended to limit the present application thereto, and various changes or modifications can be made thereto by those skilled in the art without departing from the spirit and scope of the present application, and the scope of protection of the present application should be defined by the scope of protection of the claims.

Claims

1. An online surface cleaning device for wire feeding additive manufacturing technology, wherein the metal wire is cleaned by passing through the device and then fed into a nozzle for subsequent additive manufacturing; characterized in that: A wire feeding gear set and a wire cleaning device are provided in the wire feeding channel; the wire feeding gear set provides power for the feeding of the metal wire; the wire cleaning device is equipped with a grinding cutter. During the wire feeding process, as the metal wire is fed out from the material tray, it passes through the grinding cutter of the cleaning device to achieve online surface cleaning, and is finally delivered to the nozzle for manufacturing; there is at least one set of the wire cleaning device. The wire-cleaning device includes a connecting base, a sleeve, and a grinding tool. The connecting base, which is a hollow cylinder, is used to fix the wire-cleaning device. A cylindrical grinding tool is connected to the outer end face of the hollow cylinder along its extension direction. The inner wall of the grinding tool has serrated grinding teeth. The grinding tool includes three arc-shaped tools extending in the same direction as the connecting base. An elastic connection is provided between adjacent arc-shaped tools. Of the three arc-shaped tools, the lower one is slotted, and the outer surfaces of the two upper arc-shaped tools are equipped with baffles. The grinding tool is formed... The hollow channel is interference-fitted with the passing metal wire; the cavity of the connecting base and the cavity of the grinding tool are connected to form a wire feeding channel; the sleeve is sleeved in the middle position of the connecting base and the grinding tool, and can move along the outer surface of both. When the sleeve moves to the end of the connecting base, the elastic connection between the three arc-shaped tools is in a relaxed state. When the sleeve moves to the end of the grinding tool, the elastic connection between the arc-shaped tools becomes smaller and tightens to enter the grinding process. The metal chips generated during the grinding process fall from the grooves of the lower grooved arc-shaped tool.

2. The online cleaning device for the surface of tension-type filament in a filament feeding additive manufacturing technology according to claim 1, characterized in that: The wire feeding gear set includes meshing wire feeding gears, with wire feeding grooves provided between the wire feeding gears, through which the metal wire passes during the feeding process.

3. The online cleaning device for the surface of tension-type filament in a filament feeding additive manufacturing technology according to claim 1, characterized in that: The central angle of each arc-shaped cutter is 110°, and the central angle of each elastic connection is 10°; the elastic connection is made of a high elastic modulus alloy with fatigue resistance.

4. The online cleaning device for the surface of tension-type filaments in a filament feeding additive manufacturing technology according to claim 1, characterized in that: The outer surface of the wire cleaning device is also provided with a waste chip collection box for collecting metal chips generated by the grinding tools.

5. The online cleaning device for the surface of tension-type filament in a filament feeding additive manufacturing technology according to claim 1, characterized in that: The movement of the sleeve between the connecting base and the surface of the grinding tool is driven by a motor and a crank-slider mechanism; wherein the output shaft of the motor drives the crank-slider mechanism to move, and the crank-slider mechanism is fixedly connected to the surface of the sleeve to drive the sleeve to move.

6. The online cleaning device for the surface of tension-type filament in a filament feeding additive manufacturing technology according to claim 1, characterized in that: Both the connecting base and the grinding tool are equipped with limiting baffles to restrict the movement of the sleeve.

7. A method for online cleaning of the surface of tension-type filaments in a filament feeding additive manufacturing technology, characterized in that: The process is performed using the online cleaning device as described in any one of claims 1-6, including: passing the metal wire sequentially through the wire feeding groove of the wire feeding gear set and the wire feeding cavity of the wire cleaning device, and adding a wire cleaning device according to the difficulty of cleaning impurities / contaminations on the surface of the metal wire.

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