Method for deburring composite material

Abstract

The application discloses a composite material processing burr removing method and a gluing equipment, and comprises the following steps: drilling or milling a composite material laminated plate; applying glue at the outlet of a hole formed by drilling or at the upper surface layer of a milling position, and waiting for the glue to solidify; performing second drilling or cutting on the hole or trimming the upper surface layer of the milling position, so as to remove the drilling or milling burr. The solidified glue tightly supports the burr, and then the hole is drilled or cut for the second time or the upper surface layer of the milling position is trimmed, so that the burr removing effect is good, the efficiency is high, the process is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material processing, in particular to a method for removing burrs in composite material processing and a gluing device. Background Art

[0002] Composite materials, typically composed of fibers as reinforcement and resins as a matrix, are excellent polymer-based advanced materials. Composites offer exceptional properties such as high specific strength, low density, fatigue resistance, and impact resistance. Composite laminates are typically made by layering fiber-reinforced composite prepregs in different orientations and curing them into shape. These laminates, thanks to the fiber's excellent tensile and compressive properties, possess exceptional mechanical and mechanical properties.

[0003] Composite laminates are widely used in the aerospace industry and are an important material for achieving lightweight aircraft components. They are used to manufacture aircraft load-bearing structural parts such as center wings, box partitions, and fuselage bulkheads. In order for the shape of the structural parts to meet the requirements of use, composite laminates need to undergo a large amount of milling and drilling processes, such as milling grooves, milling edges, drilling holes, etc. However, the matrix of composite laminates is soft, while the fibers are hard and brittle. Therefore, various damages may occur during the cutting process, the most typical of which is burr defects. During processing, burrs often appear in the fiber layer on the drill outlet surface of the workpiece and on the upper and lower surfaces of the milled surface of the workpiece, appearing as residual fiber filaments or fiber layers.

[0004] The existing burr removal process often adopts the freezing deburring mechanism, which usually requires the use of a freezing deburring machine. First, liquid nitrogen is used to directionally embrittle the burrs, and then high-speed freezing particles are sprayed to impact the burrs of the composite workpiece to knock down the burrs around the hole. This process is cumbersome and expensive. The freezing machine will cause a lot of energy waste, and it is easy to embrittle the hole wall during the freezing process, causing secondary damage. The burr removal accuracy is poor and the use is highly limited. Other existing patent solutions, such as the invention patent application with application number CN202110988979.8, discloses a drill bit specifically for aramid fiber reinforced composite materials. The drill bit includes a shank, a drill rod, a groove and an outer cutting edge design, which can gradually remove material from the edge of the hole to the center of the hole, thereby suppressing the generation of machining burrs in composite drilling. However, due to the uncertainty of the processing environment and working conditions, the type, thickness, hole diameter and processing parameters of the composite laminate will change with the processing goals, and the design parameters of the drill bit also need to change accordingly. It is impossible to achieve burr removal of composite laminates suitable for multiple working conditions, and it is difficult to make targeted adjustments to processing parameters such as thickness and hole diameter. Summary of the Invention

[0005] The main purpose of the present invention is to solve the problems of poor deburring effect, low efficiency, complicated process and high cost in traditional machining burr removal process, and to propose a composite material machining burr removal method and glue coating equipment.

[0006] The technical problem of the present invention is solved by the following technical solutions:

[0007] A method for removing burrs from composite material processing comprises the following steps:

[0008] Drilling or milling composite laminates;

[0009] Apply glue at the exit of the hole formed by drilling, or apply glue on the upper surface of the milled part, and wait for the glue to solidify;

[0010] The hole is drilled or cut a second time, or the upper surface of the milled portion is trimmed to remove drilling or milling burrs.

[0011] In some embodiments, the method specifically includes the following steps:

[0012] S1, clamping the composite laminate;

[0013] S2. Install the drilling tool and calibrate the tool;

[0014] S3. Setting the parameters for the first drilling according to the hole-making processing conditions of the composite laminate;

[0015] S4, drilling a through hole in the composite laminate and withdrawing the tool;

[0016] S5. Apply glue at the hole outlet and wait for the glue to solidify;

[0017] S6, determine whether the tool or workpiece needs to be disassembled, if so, go to step S7; if not, jump to step S8;

[0018] S7, replace the tool or workpiece and re-calibrate the tool;

[0019] S8. Setting the parameters of the second drilling or cutting according to the hole-making processing conditions of the composite laminate;

[0020] S9, drilling or cutting the holes made in the composite laminate for the second time;

[0021] S10, completing the removal of drilling burrs at the hole exit of the composite laminate.

[0022] In some embodiments, the method specifically includes the following steps:

[0023] S1, clamping the composite laminate;

[0024] S2. Install the milling tool and calibrate the tool;

[0025] S3. Setting the parameters for the first milling according to the milling processing conditions of the composite laminate;

[0026] S4, milling the edges of the composite laminate and retracting the tool;

[0027] S5. Apply glue to the upper surface of the milling part and wait for the glue to solidify;

[0028] S6, replace the trimming knife;

[0029] S7. Setting trimming parameters according to the milling processing conditions of the composite laminate;

[0030] S8. trimming the upper surface of the milled portion of the composite laminate;

[0031] S9. Complete the removal of milling burrs on the upper surface of the milling portion of the composite laminate.

[0032] In some embodiments, the glue is selected from any one of epoxy resin adhesive, instant glue, UV light curing glue, EVA glue, and PUR glue. Preferably, epoxy resin adhesive, EVA glue, and PUR glue are blown by an air blower, and UV light curing glue is irradiated by UV light to accelerate the curing rate.

[0033] In some embodiments, the second drilling is performed using a twist drill, a step drill or a step drill fed in the direction of the hole entrance-hole exit, and the cutting is performed using a chamfering cutter, a flat bottom cutter or a ball end cutter fed in the direction of the hole exit-hole entrance to perform local cutting around the hole exit.

[0034] In some embodiments, the trimming is performed using a trimming cutter, a flat bottom milling cutter, or a side milling cutter.

[0035] The present invention also provides a glue coating device for removing burrs in composite material processing, which is used for applying glue in the above-mentioned method for removing burrs in composite material processing, and includes a shell and a heating unit, a sealing unit and a storage and transportation unit arranged in the shell. The heating unit includes a heating column, a nozzle and a heating element. The heating column has an inner cavity for receiving glue. The heating element is configured to heat the glue in the heating column. The nozzle is connected to the inner cavity of the heating column and is used to spray out the heated and melted glue. The storage and transportation unit is connected to the inner cavity of the heating column through the sealing unit, and is used to store glue and transport glue to the inner cavity of the heating column. The sealing unit is used to prevent glue from overflowing.

[0036] In some embodiments, the storage and transport unit includes a transport slider, a connecting rod structure, a spring and a trigger. The transport slider is slidably arranged in the outer shell and is used to push glue into the inner cavity of the heating column. The transport slider is connected to the trigger through the connecting rod structure. The transport slider is coupled to the outer shell through the spring. The trigger is exposed from the outer shell. When the trigger is subjected to force, the transport slider is controlled by the connecting rod structure to overcome the elastic force of the spring and slide toward the heating column. When the trigger is reset, the transport slider is reset under the action of the restoring force of the spring.

[0037] In some embodiments, the sealing unit includes a hollow rubber cover and a partition, the flange at the bottom of the heating column is installed on the inner side of the partition, the bottom of the rubber cover has an annular groove for clamping with the flange at the bottom of the heating column, and the rubber cover is connected to the partition.

[0038] In some embodiments, a heat insulation unit is also included, which includes a heat insulation ring, a rubber sleeve and a spring clamp. The heat insulation ring is connected to the bottom of the rubber cover through a thread, and the rubber sleeve is fixed to the heat insulation ring through the spring clamp. A fitting sleeve is provided at the tail of the rubber sleeve for receiving the transport slider.

[0039] The beneficial effects of the present invention compared with the prior art include:

[0040] The present invention provides a method for removing burrs from composite material processing and a glue coating device. Compared with the prior art, the method of the present invention applies glue to the outlet of a hole formed by drilling, or to the upper surface of a milled portion, and uses the cured glue to form a tight support for the burr. The hole is then drilled or cut a second time, or the upper surface of the milled portion is trimmed. The method has good deburring effect, high efficiency, simple process, and low cost. Specifically:

[0041] 1) In the embodiment of the present invention, glue is applied to the surface of the composite laminate by a glue coating device based on the curing characteristics of the glue, thereby achieving tight support for the burrs of the composite laminate, and then a second processing is performed under the cutting tool, thereby achieving the purpose of removing the burrs of the composite laminate. Compared with the currently commonly used freezing deburring method, the composite laminate glue coating deburring method proposed in the embodiment of the present invention has the characteristics of short process time, simple operation, and good deburring effect, and can be applied to milling / drilling burr removal under different types of composite laminates, different composite laminate thicknesses, different rotation speeds and feed cutting depths, thereby achieving the effect of removing burrs of composite laminate processing, and has good development prospects in the field of composite material processing.

[0042] 2) After the burr coating glue is cured, it can achieve tight support for the processed burrs on the composite laminate, increase the fiber pre-tension stress and enhance the overall stiffness of the burr area, increase the efficiency of converting the tool cutting force into fiber shear force, reduce the friction caused by slipping between the two, make it easier for the fiber to reach the tensile limit, and thus achieve the cutting of the burrs at the hole outlet of the composite laminate.

[0043] Machining burrs are usually difficult to reprocess because compared to the original workpiece material, its resin base has been lost, the fibers lack support, and are loosely arranged, with poor stiffness and strong toughness.

[0044] After applying the glue, the curing shrinkage of the glue will tighten the fibers, causing pre-tensile stress in the fibers, making it easier for the tensile limit to be reached during subsequent cutting and causing breakage; at the same time, the cured glue acts as a base, greatly enhancing the normal constraints on the fiber's compression deformation and the tangential constraints on its bending deformation, thereby increasing the shear stress inside the fiber, making it easier to reach the material's failure limit.

[0045] In summary, the solidified glue makes up for the loss of the resin base, so that the burrs are transformed from a single fiber material back to a composite material, which increases the overall stiffness, reduces the overall toughness, and improves the overall cutting performance, so the burrs can be effectively removed.

[0046] 3) The embodiments of the present invention can specifically remove drilling burrs and milling burrs of composite laminates, and can apply glue in a targeted manner where burrs are severe, which is beneficial to saving raw materials. It also has the advantages of low hardware cost, low operation complexity, controllable burr removal, and high processing efficiency. It is beneficial to improving the surface quality of workpieces during the processing of composite laminates and is of great significance in the field of composite material processing.

[0047] 4) The gluing equipment of the embodiment of the present invention has the characteristics of uniform heating, heat insulation and anti-scalding, and sealing and anti-overflow. In the coating process for processing burrs, glue can be discharged more stably, and the burrs can be evenly covered. It also has the advantages of low hardware cost and low control difficulty, which is conducive to achieving a high-efficiency gluing process for processing burrs.

[0048] 5) Compared to existing composite laminate processing equipment, this method only requires gluing equipment (not limited to the gluing equipment proposed in this invention, which places no specific restrictions on the gluing equipment or gluing method). No additional large-scale deburring equipment, such as automatic cutting machines or freeze-dried deburring machines, is required, resulting in more cost-effective hardware. Compared to burr reduction achieved by tool optimization, this embodiment of the present invention is more direct and effective in burr removal and is applicable to a variety of cutting depths, feed rates, and drilling speeds, avoiding the process limitations caused by fixed tool configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of a method for removing burrs from composite material processing proposed in an embodiment of the present invention;

[0050] Figure 2 3D schematic diagram of the special glue coating equipment for removing burrs in composite material processing proposed in an embodiment of the present invention;

[0051] Figure 3 This is a flow chart of a composite material drilling burr removal method proposed in an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the workpiece assembly in the composite material processing burr removal method proposed in an embodiment of the present invention.

[0053] Figure 5 Schematic diagram of the gluing operation in the composite material drilling burr removal method proposed in an embodiment of the present invention;

[0054] Figure 6 This is a flow chart of a composite material milling burr removal method proposed in an embodiment of the present invention;

[0055] Figure 7 Schematic diagram of the gluing operation in the composite material milling burr removal method proposed in an embodiment of the present invention;

[0056] Figure 8a is a schematic diagram of an embodiment of the present invention in which drilling burrs are not removed;

[0057] Figure 8b This is a schematic diagram of the comparative example 1 of the present invention after the conventional drilling burr removal method is used;

[0058] Figure 8c Schematic diagram of the composite material after being processed by the method for removing burrs from drilling in Examples 1 / 2 / 3 of the present invention;

[0059] Figure 9a is a schematic diagram of an embodiment of the present invention in which milling burrs are not removed;

[0060] Figure 9b This is a schematic diagram of the comparative example 2 of the present invention after the conventional milling burr removal method is used;

[0061] Figure 9c Schematic diagram of the composite material after milling burr removal method in Example 4 of the present invention;

[0062] The reference numerals are as follows:

[0063] 1-heating column, 2-nozzle, 3-rubber ring, 4-thermal resistor, 5-partition, 6-rubber cover, 7-insulating ring, 8-rubber sleeve, 9-housing, 901-first rib, 902-second rib, 903-first limit frame, 904-second limit frame, 905-slide, 906-first fixed column, 907-second fixed column, 10-spring clamp, 11-transport slider, 12-first connecting rod, 13-spring, 14-second connecting rod, 15-trigger, 16-switch, 17-indicator light, 18-pressure plate, 19-positioning pad, 20-composite laminate, 21-vice, 22-workbench. DETAILED DESCRIPTION

[0064] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0065] It should be noted that the directional terms such as left, right, up, down, top, and bottom in this embodiment are merely relative concepts, or are based on the normal use status of the product, and should not be considered as restrictive.

[0066] An embodiment of the present invention proposes a method and device for removing burrs from composite material processing. On the basis of ordinary processing, the processing burrs on the surface of the composite material laminate are supported and fixed by utilizing a gluing process, and then secondary processing is performed to achieve the removal of the processing burrs of the composite material laminate, thereby ensuring the processing quality of the composite material laminate.

[0067] Methods for removing burrs in composite material machining Figure 1 As shown, the following steps are included:

[0068] Drilling or milling composite laminates;

[0069] Apply glue to the exit of the hole formed by drilling, or apply glue to the upper surface of the milling part, and wait for the glue to cure;

[0070] Drill or cut the hole a second time, or trim the top surface of the milled area to remove drilling or milling burrs.

[0071] like Figure 2As shown, an embodiment of the present invention proposes a glue coating device for removing burrs in composite material processing, which is used for applying glue in a method for removing burrs in composite material processing, and includes a shell 9 and a heating unit, a sealing unit and a storage and transportation unit arranged in the shell 9. The heating unit includes a heating column 1, a nozzle 2 and a heating element 4. The heating column 1 has an inner cavity for receiving glue. The heating element 4 is configured to heat the glue in the heating column 1. The nozzle 2 is connected to the inner cavity of the heating column 1 and is used to spray out the heated and melted glue. The storage and transportation unit is connected to the inner cavity of the heating column 1 through the sealing unit, and is used to store glue and transport glue to the inner cavity of the heating column 1. The sealing unit is used to prevent glue from overflowing.

[0072] The storage and transport unit includes a transport slider 11, a connecting rod structure 12 / 14, a spring 13 and a trigger 15. The transport slider 11 is slidably arranged in the shell and is used to push glue into the inner cavity of the heating column 1. The transport slider 11 is connected to the trigger 15 through the connecting rod structure 12 / 14. The transport slider 11 is coupled to the shell 9 through the spring 13. The trigger 15 is set to be exposed from the shell 9. When the trigger 15 is subjected to force, the transport slider 11 is controlled by the connecting rod structure 12 / 14 to overcome the elastic force of the spring 13 and slide toward the heating column 1. When the trigger 15 is reset, the transport slider 11 is reset under the action of the restoring force of the spring 13.

[0073] In some embodiments, the sealing unit includes a hollow rubber cover 6 and a partition 5. The flange at the bottom of the heating column 1 is installed on the inner side of the partition 5. The bottom of the rubber cover 6 has an annular groove for clamping with the flange at the bottom of the heating column 1. The rubber cover 6 is connected with the partition 5.

[0074] Furthermore, it also includes a heat insulation unit, which includes a heat insulation ring 7, a rubber sleeve 8 and a spring clamp 10. The heat insulation ring 7 is connected to the bottom of the rubber cover 6 through a thread, and the rubber sleeve 8 is fixed to the heat insulation ring 7 through the spring clamp 10. A fitting sleeve is provided at the tail of the rubber sleeve 8 for receiving the transport slider.

[0075] The heating column 1 is uniformly embedded with multiple thermal resistors 4; the storage and transportation unit is a sealed structure, and the top of the transport slider 11 is wrapped and fitted with a rubber sleeve 8. The trigger 15 is preferably arc-shaped, and the nozzle 2 is preferably needle-shaped.

[0076] Specifically, the link structure 12 / 14 is provided with a limit block, and various types and shapes of glue can be clamped in the transport slider 11 .

[0077] Furthermore, it also includes a packaging unit, which is composed of a shell 9, a switch 16, and a power cord and is used to assemble and integrate all units. There are ribs 901 / 902 inside the shell for assembling various module units.

[0078] The following is a description of the two burr removal methods for drilling and milling:

[0079] like Figure 3 As shown, for removing drilling burrs, an embodiment of the present invention provides a process for removing drilling burrs of composite materials by applying glue, comprising the following steps:

[0080] S1, clamping composite laminates;

[0081] Specifically, if Figure 4 As shown, a composite laminate 20 workpiece is clamped on a positioning pad 19 through a pressing plate 18 and a vise 21 on a workbench 22;

[0082] S2, replace the drilling tool and set the tool;

[0083] S3. Setting the parameters for the first drilling according to the hole-making processing conditions of the composite laminate;

[0084] S4, drilling a through hole in the composite laminate and withdrawing the tool;

[0085] S5, such as Figure 5 As shown, apply glue at the hole outlet and wait for the glue to solidify;

[0086] S6, determine whether the tool or workpiece needs to be disassembled, if so, go to step S7; if not, jump to step S8;

[0087] S7, replace the tool or workpiece and re-calibrate the tool;

[0088] S8. Setting the parameters of the second drilling or cutting according to the hole-making processing conditions of the composite laminate;

[0089] S9, drilling or cutting the holes made in the composite laminate for the second time;

[0090] S10, completing the removal of drilling burrs at the hole exit of the composite laminate.

[0091] like Figure 6 As shown, for removing milling burrs, an embodiment of the present invention provides a process for removing milling burrs of composite materials by applying glue, comprising the following steps:

[0092] S1, clamping composite laminates;

[0093] Specifically, if Figure 4 As shown, a composite laminate 20 workpiece is clamped on a positioning pad 19 through a pressing plate 18 and a vise 21 on a workbench 22;

[0094] S2, replace the milling tool and set the tool;

[0095] S3. Setting the parameters for the first milling according to the milling processing conditions of the composite laminate;

[0096] S4, milling the edges of the composite laminate and retracting the tool;

[0097] S5, such as Figure 7 As shown, apply glue on the processed surface, i.e. the upper surface of the milled part and wait for the glue to solidify;

[0098] S6, change the trimming knife;

[0099] S7. Setting the parameters for the second trimming according to the milling processing conditions of the composite laminate;

[0100] S8, performing a second cutting on the milled portion of the composite laminate;

[0101] S9. Complete the removal of milling burrs on the surface of the hole of the composite laminate.

[0102] The method for removing burrs from composite material machining proposed in the embodiment of the present invention is applicable to burrs generated by drilling / milling of fiber-reinforced composite materials. A tool with a suitable machining diameter is selected according to the actual target hole diameter (cutting width and cutting depth).

[0103] The gluing process uses epoxy resin adhesive, instant glue, UV light curing glue, EVA (rubber-plastic foam material made of ethylene and vinyl acetate copolymer) glue, PUR (moisture curing reactive polyurethane hot melt adhesive) glue and other glues.

[0104] In specific implementation, corresponding catalytic methods are used to accelerate the curing rate. Preferably, epoxy resin adhesive, EVA adhesive and PUR adhesive are blown by a blower, and ultraviolet light curing adhesive is irradiated by ultraviolet light.

[0105] After gluing, the composite laminate hole exit is subjected to a second cutting process. Optionally, secondary drilling can be performed using a twist drill, step drill, or step drill bit, feeding in the direction from the hole entrance to the hole exit. Local cutting can be performed using a chamfering cutter, flat bottom cutter, or ball end cutter, feeding in the direction from the hole exit to the hole entrance, to perform local cutting around the hole exit.

[0106] After the glue is applied, the surface of the composite laminate is trimmed. Optionally, the trimming can be performed by orthogonal cutting with a trimming cutter, or by using a flat-bottom milling cutter, a side milling cutter, or other tools.

[0107] Example 1:

[0108] The embodiment of the present invention first proposes a special glue coating device for removing burrs in composite material processing, such as Figure 2 Shown, including:

[0109] The heating unit is composed of a heating column 1, a nozzle 2, and a heating element 4. The heating element is a thermal resistor 4, which is used to transfer the heat of the thermal resistor 4 to the colloid, so that the colloid is evenly melted into glue. The heating column 1 has a hollow groove to form an inner cavity for receiving glue, which is used to heat the colloid pushed from the transportation unit through the insulation unit. There are empty grooves around it for placing the thermal resistor 4, which is used to heat the glue in the heating column. The front end of the heating column 1 has an external thread for connecting to the nozzle 2. The nozzle 2 is connected to the inner cavity of the heating column 1. After the colloid is heated and melted, it is sprayed out from the front end of the nozzle 2;

[0110] The heating column 1 is uniformly embedded with multiple thermal resistors 4 .

[0111] The sealing unit is composed of a rubber cover 6 and a partition 5, which is used to prevent glue from overflowing to the rear end or the outer end. The bottom of the rubber cover 6 has an annular groove for matching with the bottom flange of the heating column 1. The rubber cover 6 and the partition 5 are connected through a T-shaped groove. There are four small holes on the surface of the partition 5 for passing the wires of the thermal resistor 4. The lower end of the partition 5 has an internal thread;

[0112] The heat insulation unit consists of a heat insulation ring 7, a rubber sleeve 8, and a spring clamp 10. It is used to isolate the heat from being transferred to the handle end of the device. The heat insulation ring 7 is connected to the bottom of the rubber cover 6 by a thread. There is a small hole on the outside for transferring the wire of the thermal resistor 4 to the outside. The rubber sleeve 8 is hollow inside and has a ring fan-shaped fitting sleeve at the tail end for wrapping the transport slider 11. It is fixed to the heat insulation ring 7 by a spring clamp.

[0113] The storage and transport unit consists of a four-bar mechanism consisting of a transport slider 11, a first connecting rod 12, a second connecting rod 14, and a trigger 15. It is used to package and transport the colloid. The transport slider 11 cooperates with the inner groove of the shell 9. Driven by the trigger 15, the colloid is transported linearly through the insulation unit and the sealing unit into the heating unit in sequence.

[0114] The storage and transport unit is a sealed structure, and the top of the transport slider 11 is wrapped and fitted by a rubber sleeve 8. The trigger 15 is preferably arc-shaped, and the nozzle 2 is preferably needle-shaped.

[0115] Specifically, the link structure 12 / 14 is provided with a limit block, and various types and shapes of glue can be clamped in the transport slider 11 .

[0116] The packaging unit is composed of a housing 9, a switch 16, and a power cord, and is used to assemble and integrate all units. There are ribs 901 / 902 inside the housing for assembling various module units.

[0117] The top of the heating column 1 is threadedly connected to a needle-shaped nozzle 2, and a rubber ring 3 is embedded in the waist of the needle-shaped nozzle 2. A thermal resistor 4 is embedded in the inner cavity of the heating column 1 through silicone grease. The bottom flange of the heating column 1 is installed in the middle of the partition 5 and is clamped by a rubber cover 6. The partition 5 is embedded with the rubber cover 6 through a T-slot, and the partition 5 is threadedly connected to the thermal insulation ring 7. The outer side of the bottom of the thermal insulation ring 7 is attached to a rubber sleeve 8 via a spring clamp 10. The spring clamp enhances the fit.

[0118] The heating column 1, partition 5, and rubber sleeve 8 are fixed on the first rib 901, the second rib 902, the first limit frame 903 and the second limit frame 904 of the outer shell 9. A slide groove 905 is opened at the tail of the inner cavity of the outer shell 9, and a transport slider 11 is slidably connected in the slide groove 905.

[0119] The tubular front end of the transport slider 11 is inserted into the rubber sleeve 8, and the waist side bearing of the transport slider 11 is connected to the first connecting rod 12. The bottom of the first connecting rod 12 has a fixed column connected to the first fixed column 906 of the outer shell 9 through a spring 13, and the first connecting rod 12 is connected to the second connecting rod 14 by the bearing, and the second connecting rod 14 is connected to the trigger 15 by the bearing, and the middle part of the trigger 15 is fixed to the second fixed column 907 of the outer shell 9.

[0120] A switch 16 and an indicator light 17 are installed at the rear of the housing 9. The thermal resistor 4, the switch 16 and the indicator light 17 are connected via a power line.

[0121] The working principle of the gluing equipment is as follows:

[0122] When in use, first fill the colloid into the transport slider 11, connect the power cord to the power supply, and start the switch 16 to make the thermal resistor 4 and the indicator light 17 work, then squeeze the trigger 15, the trigger 15 rotates around the second fixed column 907, driving the second connecting rod 14 and the first connecting rod 12 to move, and the first connecting rod 12 drives the transport slider 11 to slide along the slide groove 905, and the colloid passes through the rubber sleeve 8, the insulation ring 7, the rubber cover 6, the insulation plate 5 in turn and is finally transported into the empty groove inside the heating column 1, and the colloid in the heating column 1 is heated by the thermal resistor 4, and then release the trigger 15, and the transport slider 11 is reset under the pull of the spring 13, driving the second connecting rod 14, the first connecting rod 12, and the trigger 15 to reset, and squeeze the trigger 15 again, and the transport slider 11 repeats the above movement, and the newly transported colloid enters the empty groove inside the heating column 1, squeezing the previously heated and melted glue toward the needle nozzle 2 and spraying it out from the needle nozzle 2, completing one glue spraying.

[0123] This embodiment provides a composite material drilling burr removal method corresponding to the above-mentioned equipment, such as Figure 3 As shown, the following steps are included:

[0124] Step S1: Figure 4As shown, the composite laminate workpiece is clamped on the positioning pad. First, the positioning pad is fixed on the vise of the machine tool. Then, the composite laminate obtained by sample preparation is placed into the groove of the positioning pad. The composite laminate is fixed to the positioning pad by a pressing plate to achieve the positioning of the hole during drilling and ensure the stability and accuracy of the hole making.

[0125] Step S2: Replace the tool and align it. =4mm PCD (polycrystalline diamond) drill bit to avoid wear of ordinary drill bits and affect the processing quality of the hole wall of composite laminates. Tool setting is to ensure that the tool tip is in the center of the hole to be made. The X, Y, and Z axis positions of the tool holder are manually adjusted and the processing machine tool tool setting instrument is used to assist in this task.

[0126] Step S3: according to the hole-making processing conditions of the composite laminate, set the parameters of the first drilling, the spindle speed is 2000 rpm, and the feed speed is 100 rpm;

[0127] Step S4: Drill a through hole in the composite material laminate and retract the tool. Position the hole to be drilled in the coordinate system established by the tool setting in step S2. Drill at the speed and feed determined in step S3. Retract the tool after completion.

[0128] Step S5: Apply glue at the hole outlet and wait for the glue to solidify. The glue application process is as follows: Figure 5 As shown, use the aforementioned burr processing glue coating equipment to spray an appropriate amount of PUR glue around the hole outlet, focusing on the areas with severe burrs. The glue can completely cover the hole wall surface at the hole outlet. After gluing, align the blower outlet with the hole outlet to achieve rapid cooling and solidification, thereby avoiding affecting the hole processing efficiency.

[0129] Step S6: It is determined that the present solution requires the removal of the tool, and therefore the tool needs to be recalibrated, and then the process proceeds to step S7;

[0130] Step S7: Replace the tool and re-calibrate the tool. =6mm PCD drill bit, based on the first drilling, expands the hole to meet the final hole diameter requirements, and completes the secondary processing of the composite laminate outlet to achieve cutting and removal of burrs.

[0131] Step S8: According to the hole-making processing conditions of the composite material laminate, the parameters of the second drilling are set, with the spindle speed being 2000 r / min and the feed speed being 100 r / min.

[0132] Step S9: Drill the holes made in the composite laminate for a second time. Position the holes in the coordinate system established by the tool setting in step S7, and drill at the speed and feed determined in step S8. After drilling, remove the pressing plate and clean the surface of the composite laminate with an air gun to remove any PUR adhesive residue.

[0133] Step S10: completing the removal of burrs at the hole outlets of the composite laminate.

[0134] Example 2:

[0135] This embodiment discloses a method for removing burrs from composite materials by drilling. Figure 3 As shown, the following steps are included:

[0136] Step S1: Figure 4 As shown, the composite laminate workpiece is clamped on the positioning pad. First, the positioning pad is fixed on the vise of the machine tool. Then, the composite laminate obtained by sample preparation is placed in the upper groove of the positioning pad. The composite laminate is fixed on the positioning pad by a pressing plate to achieve the positioning of the hole during drilling and ensure the stability and accuracy of the hole making.

[0137] Step S2: Replace the tool and align it. =3mm, =6mm two-stage stepped drill, avoids tool disassembly during the second processing, ensures processing efficiency and hole making accuracy. Tool setting is to ensure that the tool tip is in the center of the hole to be made. It is completed by manually adjusting the X, Y, and Z axis positions of the tool holder and cooperating with the tool setting instrument of the processing machine tool;

[0138] Step S3, according to the working conditions of the composite material laminate hole making process, set the parameters of the first drilling, the spindle speed is 2000r / min, the feed speed is 100r / min; Step S4, drill a through hole in the composite material laminate and retract the tool, realize the positioning of the hole to be made in the coordinate system established by the tool in step S2, drill at the speed and feed determined in step S3, and then use the drill bit to drill the hole. =3mm part After drilling a 3mm through hole, withdraw the tool;

[0139] Step S5: Figure 5 As shown, apply glue at the hole exit and wait for the glue to solidify. Use a UV glue syringe to spray an appropriate amount of UV light-curing glue around the hole exit, focusing on the areas with severe burrs. After applying the glue, aim the UV lamp at the hole exit and irradiate for 15-30 seconds at a lamp distance of 3 cm to achieve a rapid curing effect and avoid affecting the hole processing efficiency.

[0140] Step S6: It is determined that the present solution does not require disassembly of the tool and the workpiece, and therefore, no re-calibration of the tool is required, and the process then jumps to step S8;

[0141] Step S8: According to the hole-making processing conditions of the composite material laminate, the parameters of the second cutting are set, with the spindle speed being 2000 r / min and the feed speed being 100 r / min.

[0142] Step S9: Drill the holes in the composite laminate for the second time at the speed and feed determined in step S8. = Drill a 6mm through hole in the 6mm part. After drilling, remove the pressing plate and use an air gun to clean the surface of the composite laminate to remove any residual UV light-curing adhesive.

[0143] Step S10: completing the removal of burrs at the hole outlets of the composite laminate.

[0144] Example 3:

[0145] This embodiment discloses a method for removing burrs from composite material during drilling. Figure 3 As shown, the following steps are included:

[0146] Step S1, reference Figure 4 , clamp the composite laminate workpiece on the positioning pad. First, fix the positioning pad on the machine tool vise. Then put the composite laminate obtained by sample preparation into the upper groove of the positioning pad. Fix the composite laminate on the positioning pad by the pressing plate to achieve the positioning of the hole during drilling and ensure the stability and accuracy of the hole making.

[0147] Step S2: Replace the tool and align it. =6mm PCD twist drill to avoid wear of ordinary drill bits and affect the processing quality of composite laminate hole wall. Tool setting is to ensure that the tool tip is in the center of the hole to be made. The X, Y, and Z axis positions of the tool holder are manually adjusted and the processing machine tool tool setting instrument is used to assist in this task.

[0148] Step S3: according to the hole-making processing conditions of the composite laminate, set the parameters of the first drilling, the spindle speed is 2000 rpm, and the feed speed is 100 rpm;

[0149] Step S4: Drill a through hole in the composite material laminate and retract the tool. Position the hole to be drilled in the coordinate system established by the tool setting in step S2. Drill at the speed and feed determined in step S3. Retract the tool after completion.

[0150] Step S5: Figure 5 As shown, glue is applied at the hole outlet, and after the glue solidifies, the workpiece is turned over and re-clamped. A hot melt glue gun is used to spray an appropriate amount of hot melt glue around the hole outlet, focusing on spraying where the burrs are severe. The glue can completely cover the hole outlet. After applying the glue, the air outlet of the blower is aligned with the hole outlet to achieve the effect of rapid cooling and solidification, thereby avoiding affecting the processing efficiency of the hole. The workpiece is turned over in order to subsequently process the local area of ​​the hole outlet of the composite laminate.

[0151] Step S6: It is determined that the present solution requires the disassembly of the tool and the workpiece, and therefore the tool needs to be recalibrated, and then the process proceeds to step S7;

[0152] Step S7: Replace the tool and re-calibrate the tool. =8mm PCD chamfering tool, the small interference of the chamfering tool can complete the secondary processing of the composite laminate outlet and realize the cutting and removal of burrs. The tool setting is to ensure that the tool tip is in the center of the hole to be made. It is completed by manually adjusting the X, Y, and Z three-axis position of the tool holder and cooperating with the tool setting instrument of the processing machine tool.

[0153] Step S8: According to the hole-making processing conditions of the composite material laminate, the parameters of the second cutting are set, with the spindle speed being 2000 r / min and the feed speed being 100 r / min.

[0154] Step S9: Perform a second cut on the holes made in the composite laminate. Position the holes in the coordinate system established by the tool setting in step S7. Cut at the speed and feed determined in step S8. After the cutting is completed, remove the pressing plate and clean the surface of the composite laminate with an air gun to remove any residual hot melt adhesive.

[0155] Step S10: completing the removal of burrs at the hole outlets of the composite laminate.

[0156] Example 4:

[0157] The embodiment of the present invention discloses a method for removing burrs from composite material milling, referring to Figure 6 , including the following steps:

[0158] Step S1, reference Figure 4 , clamp the composite laminate workpiece on the fixture. First, fix the fixture on the vise of the machine tool, then put the composite laminate obtained by sample preparation into the stepped groove of the fixture, and fix the composite laminate on the fixture through the pressing plate to realize the positioning of the workpiece during milling and ensure the stability and accuracy of the milling edge;

[0159] Step S2: Replace the tool and align it. =10mm titanium aluminum nitride coated end mill to avoid wear of ordinary milling cutters and affect the processing quality of composite laminates. Tool setting is to ensure the accuracy of cutting width and cutting depth. The X, Y, and Z axis positions of the tool holder are manually adjusted and the processing is assisted by the processing machine tool tool setting instrument.

[0160] Step S3: According to the working conditions of the composite laminate, the parameters for the first milling are set as follows: the spindle speed is 6000 rpm, the feed speed is 100 mm / min, the cutting depth is 2 mm, and the cutting width is 0.5 mm;

[0161] Step S4: milling an edge or milling a through groove on the composite material laminate and withdrawing the tool, positioning the edge to be milled in the coordinate system established by the tool in step S2, performing milling at the speed and feed determined in step S3, and withdrawing the tool after completion;

[0162] Step S5: Apply glue to the surface of the processed surface and wait for the glue to solidify. The glue application process is as follows: Figure 7 As shown, use the aforementioned burr processing glue coating equipment to spray an appropriate amount of PUR glue along the surface of the processed surface, focusing on the areas with serious burrs. After gluing, aim the blower outlet at the upper surface to achieve a rapid cooling and solidification effect, thereby avoiding affecting the trimming processing efficiency.

[0163] Step S6, replace the tool and re-calibrate the tool, replace the trimming tool, the orthogonal cutting of the trimming tool can complete the secondary processing of the surface layer of the composite material laminate, and realize the cutting and removal of burrs. The tool setting is to achieve the parallelism of the tool tip and the upper surface of the milling edge, which is completed by manually adjusting the X, Y, and Z three-axis positions of the tool holder and cooperating with the tool setting instrument of the processing machine tool.

[0164] Step S7: According to the milling processing conditions of the composite material laminate, the trimming parameters are set, and the feed speed is 100 mm / min.

[0165] Step S8: Trimming the upper surface of the milled portion of the composite laminate. Positioning the machined surface in the coordinate system established by the tool setting in step S7. Cutting is performed at the feed rate determined in step S7. After cutting, the pressing plate is removed and the surface of the composite laminate is cleaned with an air gun to remove any residual hot melt adhesive.

[0166] Step S9: Complete the removal of milling burrs on the surface of the composite material laminate.

[0167] Comparative Example 1

[0168] In order to test the burr removal effect of the composite material processing burr removal method proposed in the present invention, the traditional deburring method and the composite material processing burr removal method using the glue coating scheme were used to drill holes in the same composite material laminate in Example 1 / 2 / 3, and the burr removal effect of the composite material laminate was compared. Among them, the traditional deburring method refers to the traditional deburring method without the glue coating step. Compared with the composite material processing burr removal method using the glue coating scheme, there is no fundamental difference except for the missing step S5. The schematic diagram of the drilling burr not being removed is shown as follows. Figure 8a As shown, the results after the traditional method of removing drilling burrs are as follows Figure 8b As shown, the results of the composite material drilling burr removal method used in Examples 1 / 2 / 3 of the present invention are as follows: Figure 8c shown.

[0169] Comparative Example 2

[0170] The same composite laminate of Example 4 was milled using the traditional deburring method, and the burr removal effect of the composite laminate was compared with that of Example 4. Figure 9a As shown, the results after the traditional milling burr removal method are as follows Figure 9b As shown in the figure, the results of the method for removing burrs from composite material milling in Example 4 of the present invention are as follows: Figure 9c shown.

[0171] Table 1 shows a comparison of the cutting effects of the conventional deburring method and Examples 1-4 of the present invention.

[0172] Table 1

[0173] The embodiments of the present invention have the following beneficial effects:

[0174] 1) In the embodiment of the present invention, glue is applied to the surface of the composite laminate by a glue coating device based on the curing characteristics of the glue, thereby achieving tight support for the burrs of the composite laminate, and then a second processing is performed under the cutting tool, thereby achieving the purpose of removing the burrs of the composite laminate. Compared with the freezing deburring method currently commonly used in factories, the composite laminate glue coating deburring method proposed in the embodiment of the present invention has the characteristics of short process time, simple operation, and good deburring effect, and can be applied to milling / drilling burr removal under different types of composite laminates, different composite laminate thicknesses, different rotation speeds and feed cutting depths, thereby achieving the effect of removing burrs of composite laminate processing, and has good development prospects in the field of composite material processing.

[0175] 2) After the burr coating glue is cured, it can achieve tight support for the processed burrs on the composite laminate, increase the fiber pre-tension stress and enhance the overall stiffness of the burr area, increase the efficiency of converting the tool cutting force into fiber shear force, reduce the friction caused by slipping between the two, make it easier for the fiber to reach the tensile limit, and thus achieve the cutting of the burrs at the hole outlet of the composite laminate.

[0176] Machining burrs are usually difficult to reprocess because compared to the original workpiece material, its resin base has been lost, the fibers lack support, and are loosely arranged, with poor stiffness and strong toughness.

[0177] After applying the glue, the curing shrinkage of the glue will tighten the fibers, causing pre-tensile stress in the fibers, making it easier for the tensile limit to be reached during subsequent cutting and causing breakage; at the same time, the cured glue acts as a base, greatly enhancing the normal constraints on the fiber's compression deformation and the tangential constraints on its bending deformation, thereby increasing the shear stress inside the fiber, making it easier to reach the material's failure limit.

[0178] In summary, the solidified glue makes up for the loss of the resin base, so that the burrs are transformed from a single fiber material back to a composite material, which increases the overall stiffness, reduces the overall toughness, and improves the overall cutting performance, so the burrs can be effectively removed.

[0179] 3) The embodiments of the present invention can specifically remove drilling burrs and milling burrs of composite laminates, and can apply glue in a targeted manner where burrs are severe, which is beneficial to saving raw materials. It also has the advantages of low hardware cost, low operation complexity, controllable burr removal, and high processing efficiency. It is beneficial to improving the surface quality of workpieces during the processing of composite laminates and is of great significance in the field of composite material processing.

[0180] 4) The gluing equipment of the embodiment of the present invention has the characteristics of uniform heating, heat insulation and anti-scalding, and sealing and anti-overflow. In the coating process for processing burrs, glue can be discharged more stably, and the burrs can be evenly covered. It also has the advantages of low hardware cost and low control difficulty, which is conducive to achieving a high-efficiency gluing process for processing burrs.

[0181] 5) Compared to existing composite laminate processing equipment, this method only requires gluing equipment (not limited to the gluing equipment proposed in this invention, which places no specific restrictions on the gluing equipment or gluing method). No additional large-scale deburring equipment, such as automatic cutting machines or freeze-dried deburring machines, is required, resulting in more cost-effective hardware. Compared to burr reduction achieved by tool optimization, this embodiment of the present invention is more direct and effective in burr removal and is applicable to a variety of cutting depths, feed rates, and drilling speeds, avoiding the process limitations caused by fixed tool configurations.

[0182] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. Those skilled in the art will recognize that several equivalent substitutions or obvious variations can be made without departing from the scope of the present invention, and that any equivalent performance or application should be considered to fall within the scope of protection of the present invention.

Claims

1. A method for removing burrs from composite material processing, characterized in that: The steps include: Drilling or milling a composite material laminate; the composite material has fibers as reinforcement and resin as matrix; Apply glue at the exit of the hole formed by drilling, or apply glue on the upper surface of the milled part, and wait for the glue to solidify; after the glue applied to the burr is solidified, tight support of the machined burr on the composite laminate is achieved, the fiber pre-tension stress is increased, and the overall stiffness of the burr area is enhanced, so as to increase the efficiency of converting the tool cutting force into the fiber shear force and reduce the friction caused by the slipping of the two; Drilling or cutting the hole a second time, or trimming the upper surface of the milled portion, to remove drilling or milling burrs tightly supported by the cured glue; specifically comprising the following steps: S1, clamping the composite laminate; S2. Install the drilling tool and calibrate the tool; S3. Setting the parameters for the first drilling according to the hole-making processing conditions of the composite laminate; S4, drilling a through hole in the composite laminate and withdrawing the tool; S5. Apply glue at the hole outlet and wait for the glue to solidify; S6, determine whether the tool or workpiece needs to be disassembled, if so, go to step S7; if not, jump to step S8; S7, replace the tool or workpiece and re-calibrate the tool; S8. Setting the parameters of the second drilling or cutting according to the hole-making processing conditions of the composite laminate; S9, drilling or cutting the holes made in the composite laminate for the second time; S10, completing the removal of drilling burrs at the hole exit of the composite laminate; Alternatively, the steps include: S1, clamping the composite laminate; S2, install the milling tool and align the tool; S3. Setting the parameters for the first milling according to the milling processing conditions of the composite laminate; S4, milling the edges of the composite laminate and retracting the tool; S5. Apply glue to the upper surface of the milling part and wait for the glue to solidify; S6, replace the trimming knife; S7. Setting trimming parameters according to the milling processing conditions of the composite laminate; S8. trimming the upper surface of the milled portion of the composite laminate; S9. Complete the removal of milling burrs on the surface of the composite laminate.

2. The method for removing burrs from composite material processing according to claim 1, wherein: The glue is selected from any one of epoxy resin adhesive, instant glue, ultraviolet light curing glue, EVA glue, and PUR glue. The epoxy resin adhesive, EVA glue, and PUR glue are blown by an air blower, and the ultraviolet light curing glue is irradiated by ultraviolet light to accelerate the curing rate.

3. The method for removing burrs from composite material processing according to claim 1, wherein: The second drilling is performed by feeding a twist drill, a step drill or a step drill along the direction of hole entrance-hole exit, and the cutting is performed by feeding a chamfering cutter, a flat bottom cutter or a ball end cutter along the direction of hole exit-hole entrance to perform local cutting around the hole exit.

4. The method for removing burrs from composite material processing according to claim 1, wherein: The trimming is performed by using a trimming cutter, a flat bottom milling cutter or a side milling cutter.

5. The method for removing burrs from composite material processing according to claim 1, wherein: A glue coating device for removing burrs from composite material processing is used, comprising a shell and a heating unit, a sealing unit, and a storage and transportation unit arranged in the shell. The heating unit comprises a heating column, a nozzle, and a heating element. The heating column has an inner cavity for receiving glue. The heating element is configured to heat the glue in the heating column. The nozzle is connected to the inner cavity of the heating column and is used to spray out the heated and melted glue. The storage and transportation unit is connected to the inner cavity of the heating column through the sealing unit and is used to store glue and transport glue to the inner cavity of the heating column. The sealing unit is used to prevent glue from overflowing.

6. The method for removing burrs from composite material processing according to claim 5, characterized in that: The storage and transportation unit includes a transportation slider, a connecting rod structure, a spring and a trigger. The transportation slider is slidably arranged in the shell and is used to push glue into the inner cavity of the heating column. The transportation slider is connected to the trigger through the connecting rod structure. The transportation slider is coupled to the shell through the spring. The trigger is exposed from the shell. When the trigger is subjected to force, the transportation slider is controlled by the connecting rod structure to overcome the elastic force of the spring and slide toward the heating column. When the trigger is reset, the transportation slider is reset under the action of the restoring force of the spring.

7. The method for removing burrs from composite material processing according to claim 5 or 6, characterized in that: The sealing unit includes a hollow rubber cover and a partition. The flange at the bottom of the heating column is installed on the inner side of the partition. The bottom of the rubber cover has an annular groove for clamping with the flange at the bottom of the heating column. The rubber cover is connected to the partition.

8. The method for removing burrs from composite material processing according to claim 7, wherein: It also includes a heat insulation unit, which includes an insulation ring, a rubber sleeve and a spring clamp. The insulation ring is connected to the bottom of the rubber cover through a thread, and the rubber sleeve is fixed to the insulation ring through the spring clamp. A fitting sleeve is provided at the tail of the rubber sleeve for receiving the transport slider.

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