CN221247040U

CN221247040U - Cutting tool

Info

Publication number: CN221247040U
Application number: CN202322012412.4U
Authority: CN
Inventors: 黄文亮; 王振国; 吕涛; 程谟力; 龙重旺
Original assignee: Blue Whale Technology Shenzhen Co ltd
Current assignee: Blue Whale Technology Shenzhen Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-07-02
Anticipated expiration: 2033-07-27

Abstract

The application relates to the technical field of machine manufacturing, and discloses a cutter, which comprises a handle and a blade part, wherein the handle is used for mounting and fixing the cutter; the cutting edge has a tip at one axial end, and one end facing away from the tip is connected to the shank, and the tip includes a main cutting edge having an axial rake angle of a set angle and a radial rake angle of a positive angle. When the cutting edge part drills in, the radial rake angle of the positive angle can press down the surface layer material, the weakening cutting edge drills in and peels off, the inlet burrs, layering and tearing are effectively reduced, the chip breaking performance can be enhanced in the cutting process, the winding knife is reduced, the chip removal scratch on the machining surface is effectively avoided, and the drilling quality is guaranteed. The method can be applied to drilling of CFRP/Al (carbon fiber composite/aluminum alloy) laminated materials, effectively inhibit defects such as burrs, layering and tearing, meet the requirement of drilling quality, and are beneficial to improving the connection stability and strength of laminated material structural members.

Description

Cutting tool

Technical Field

The utility model relates to the technical field of machine manufacturing, in particular to a cutter.

Background

The composite material laminated metal material can overcome the performance defect of a single material and improve the strength, and is widely applied in the aerospace field, but due to the fact that the composite material is high in fiber strength and hardness and low in interlayer binding force, layering, burrs and tearing are easy to occur at an inlet and an outlet in hole making processing, burrs and flanging are easy to occur at a metal material outlet, and the traditional metal cutting tool is difficult to meet the hole making quality requirement. In some technologies, through the adjustment of a processing technology and cutting parameters and the improvement of a cutter material or a cutter coating, the performances of chip removal, heat conduction, wear resistance and the like can be improved, the hole making quality is improved to a certain extent, and the service life is prolonged. However, such composite materials have lamination characteristics and directionality, and the damage easily generated during hole making is still difficult to overcome.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a cutter capable of weakening the penetration stripping of the cutting edge and strengthening the chip breaking performance.

The cutter comprises a handle and a blade part, wherein the handle is used for mounting and fixing the cutter; the cutting part has a tip at one axial end, one end facing away from the tip is connected to the shank, the tip includes a main cutting edge having an axial rake angle of a set angle and a radial rake angle of a positive angle.

The cutter provided by the embodiment of the utility model has at least the following beneficial effects: through above-mentioned optimization to main cutting edge axial rake angle and radial rake angle, when the cutting part is bored, the main cutting edge can push down to the surface layer material, weakens that the cutting edge is bored and is peeled off, effectively less entry burr, layering and tearing, and the cutting process can strengthen the chip breaking performance, reduces the winding sword, effectively avoids chip removal fish tail machined surface, guarantees drilling quality. For example, when the cutter is applied to drilling of CFRP/Al (carbon fiber composite material/aluminum alloy) laminated materials, the effect of the optimized axial rake angle and the optimized radial rake angle of the main cutting edge on the carbon fiber cutting layer is changed from peeling eversion bending fracture to downward extrusion cutting fracture, and the carbon plate inlet is free of burrs, layering, splitting and other damages, so that aluminum scraps are promoted to deform and break when the aluminum alloy is cut, and the chip breaking performance is better. Therefore, through the structural improvement of the tip end of the blade part, the defects of burrs, layering, tearing and the like can be effectively restrained when the laminated structure is used for making holes, so that the hole making quality is effectively improved, the hole making quality requirement is met, and the connection stability and strength of the laminated material structural member are improved.

According to the cutter of the embodiment of the utility model, the axial rake angle is in the range of-7 degrees to 7 degrees, and the radial rake angle is in the range of 3 degrees to 15 degrees.

According to the cutter of the embodiment of the utility model, the axial rake angle is 0 degrees.

According to the cutter of the embodiment of the utility model, the angle of the radial rake angle is 9 degrees.

According to the cutter provided by the embodiment of the utility model, the front angle polished by the front cutter surface of the main cutting edge meets the following conditions: the numerical variation of the rake angle is gradually reduced from the axis of the blade part to the direction of increasing the radial distance, so that the cutting dynamic of the main cutting edge is optimized, the smoothness and stability of hole making can be improved, and the anti-vibration and chip breaking performance is good.

According to an embodiment of the present utility model, the cutting edge comprises at least three lands extending helically from the tip to the shank, the lands being spaced apart from each other.

According to an embodiment of the present utility model, the blade portion includes the lands and backs extending spirally from the tip toward the shank, at least one of the backs having one of the lands on each side.

According to the cutter disclosed by the embodiment of the utility model, the tip comprises the chisel edge and two main cutting edges, the two main cutting edges are symmetrically arranged relative to the axis of the edge part, the two main cutting edges are mutually spaced, and the chisel edge is positioned between the two main cutting edges.

According to the cutter disclosed by the embodiment of the utility model, the distance between the two main cutting edges is smaller than the length of the chisel edge.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic view of a conventional tool and its axial rake angle;

FIG. 2 is a schematic illustration of processing a carbon fiber composite material using a conventional tool;

FIG. 3 is a schematic view of processing an aluminum alloy using a conventional tool;

FIG. 4 is a schematic view of an embodiment of a tool and its axial rake angle;

FIG. 5 is a schematic view of a tool for machining carbon fiber composite materials using an embodiment of the present utility model;

FIG. 6 is a schematic view of a tool for machining aluminum alloy using an embodiment of the present utility model;

FIG. 7 is a schematic view of several positions on the main cutting edge of a conventional tool;

FIG. 8 is a schematic view of the rake angle at several locations on the main cutting edge of FIG. 7;

FIG. 9 is a schematic view of several positions on the main cutting edge of a tool according to an embodiment of the utility model;

FIG. 10 is a schematic view of rake angles at several locations on the main cutting edge of FIG. 9;

FIG. 11 is a graph showing the comparison of the trend of the change of the rake angle of the main cutting edge of the cutter according to the embodiment of the utility model with that of the conventional cutter;

FIG. 12 is a schematic view showing the supporting state of the margin and the hole wall of the cutter according to the embodiment of the present utility model;

FIG. 13 is a schematic view of an embodiment of the present utility model looking axially at the tip;

FIG. 14 is a schematic view of a hole entry tear condition;

FIG. 15 is a schematic view of an orifice exit flange;

FIG. 16 is a graph of comparative pore morphology for test one;

FIG. 17 is a graph of pore morphology comparison record of test two.

Reference numerals:

A handle 100;

a blade 200, a tip 210, a main cutting edge 211, a chisel edge 212, a no cutting ability region 213, a circle of revolution 214, a back 220, and a margin 230;

A hole wall 300;

a carbon fiber composite 400, a carbon fiber cutting layer 401;

aluminum alloy 500, aluminum flake 501.

Detailed Description

The conception and the technical effects produced by the present application will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present application. It is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present application based on the embodiments of the present application.

In the description of the embodiments of the present application, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and it is not indicated or implied that the apparatus or device referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the embodiments of the present application, if a feature is referred to as being "disposed", "fixed", "connected" or "mounted" on another feature, it can be directly disposed, fixed or connected to the other feature or be indirectly disposed, fixed or connected or mounted on the other feature. In the description of the embodiments of the present application, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

Fig. 1 is a schematic view of a conventional cutter and an axial rake angle thereof, fig. 2 is a schematic view of processing a carbon fiber composite material using the conventional cutter, and fig. 3 is a schematic view of processing an aluminum alloy using the conventional cutter. Composite laminated metal materials, such as carbon fiber composite 400 (CFRP) laminated aluminum alloy 500 and laminated stainless steel laminated structures, can overcome the performance defects of single materials and improve strength, are widely applied in the aerospace field, and laminated material structural members are assembled into aviation equipment part components in a bolt connection mode and the like, so that the processing of laminated materials is mainly carried out, the hole making quality influences the connection strength and stability of the structural members, and the hole making quality is demanding. However, in the composite laminated metal material, the CFRP carbon fiber composite 400 is a multi-directional laminated material, and has anisotropy, and when the conventional cutter is used for cutting, referring to fig. 1 and 2, the axial rake angle of the internal edge sharpening position of the conventional cutter is 5 ° (as in position B in fig. 1), the axial rake angle of the external edge position is 25 ° (as in position a in fig. 1), and when the composite material is processed, the carbon fiber cutting layer 401 is easily severely damaged such as delamination, burrs, and tearing, and the cutting temperature is high. The metal material has some difficulties in cutting, for example, the aluminum alloy 500 has lower hardness strength, better plasticity, higher heat dissipation and better machinability, but the aluminum scraps 501 are not easy to break, and referring to fig. 3, when the conventional cutter is adopted for processing, the aluminum alloy 500 is difficult to break and easy to bond; stainless steel work hardening is serious, cutting force is big, the temperature is high, the difficult rupture of smear metal, easy bonding exist, therefore have chip breaking difficulty and processing problem, easily lead to export burr, turn-ups, the difficult still easy sword that leads to twining of chip breaking, need stop the sword clearance, the smear metal also can fish tail the machined surface, leads to the pore wall damage, easy bonding. Therefore, the hole making processing of the laminated structure of the composite material laminated metal material has the problems of layering, tearing, burrs and the like, the traditional cutter is difficult to meet the processing requirements, and the problem of how to improve the hole making processing quality is always to be solved.

According to the utility model, through the improvement of the cutter structure, the geometric structure of the main cutting edge is optimized, the main cutting edge directly acts on the laminated structure to improve the contact state and the cutting process during processing, the cutting dynamic of the main cutting edge is optimized, the smoothness and the stability of hole making are improved, and the laminated structure has good vibration resistance. The cutting edge is weakened, the drilling and stripping are carried out, the chip breaking performance is enhanced, and the damage of burrs, layering, splitting and the like in hole making processing can be effectively reduced. Embodiments of the utility model are described below with reference to the accompanying drawings:

FIG. 4 is a schematic view of an embodiment of the tool of the utility model and its axial rake angle, radial rake angle, and referring to FIG. 4, the embodiment of the tool of the utility model comprises a shank portion 100 and an edge portion 200, the shank portion 100 being used for mounting and securing the tool; the blade 200 has a tip 210 at one end in the axial direction, and an end facing away from the tip 210 is connected to the shank 100. The tip 210 of the blade 200 includes a main cutting edge 211, and the main cutting edge 211 has an axial rake angle of a set angle and a radial rake angle of a positive angle. Compared with a common drill bit with a larger axial rake angle change value, when the cutter blade part 200 is drilled in, the axial rake angle of a set angle and the radial rake angle of a positive angle can be used for pressing down a surface layer material, so that the drilling stripping of a cutting blade is weakened, the entry burrs, layering and tearing are effectively reduced, the chip breaking performance can be enhanced in the cutting process, the winding cutter is reduced, the chip removal scratch on a machining surface is effectively avoided, and the drilling quality is ensured. Therefore, by improving the structure of the tip 210 of the blade part 200, the defects of burrs, layering, tearing and the like can be effectively restrained when the laminated structure is used for hole making, the hole making quality requirement is met, and the connection stability and strength of the laminated material structural part are improved. For example, fig. 4 shows an alternative example in which a position B schematically illustrates an example in which the inner blade sharpening position (near the feed axis position) has an axial rake angle of 5 ° and a position a schematically illustrates an example in which the outer blade position (rake face sharpening position) has an axial rake angle of 0 °. Fig. 5 is a schematic diagram of machining a carbon fiber composite material by using the cutter according to the embodiment of the present utility model, fig. 6 is a schematic diagram of machining an aluminum alloy by using the cutter according to the embodiment of the present utility model, and referring to fig. 5 and 6, when the cutter according to the embodiment of the present utility model is applied to drilling a CFRP/Al laminate, the effect of the radial rake angle of the main cutting edge 211 on the carbon fiber cutting layer 401 of the carbon fiber composite material 400 is changed from peeling eversion bending fracture (as shown in fig. 2) to downward extrusion cutting fracture (as shown in fig. 5), and the entrance of the carbon fiber composite material layer is free of burrs, delamination, cleavage and other damages; referring to fig. 6, when the aluminum alloy 500 is cut, aluminum scraps 501 are promoted to deform and break, the scraps breaking performance is better, outlet burrs and eversion are effectively restrained, scratches on a machining surface are reduced, and accordingly hole making quality is improved.

In the cutter of some embodiments, unlike the conventional axial rake angle of the drill, the axial rake angle of the cutter blade 200 may be an angle ranging from-7 ° to 7 °, and the radial rake angle may be an angle ranging from 3 ° to 15 °, so as to optimize the axial rake angle and the radial rake angle, and the axial rake angle and the radial rake angle in the angle range are more beneficial to the hole forming processing of the carbon fiber composite laminated metal material, and the corresponding axial rake angle and the radial rake angle of the main cutting edge 211 may be reasonably configured according to factors such as the aperture and the depth of the required processing, so as to reduce the inlet and outlet damage. For example, the axial rake angle of the main cutting edge 211 may be-7 °, -6 °, -5 °, -4 °, -3 °, -2 °, -1 °, 0 °, 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, or other angular values in the range of-7 ° to 7 °, and the radial rake angle may be 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °, 11 °, 12 °, 13 °, 14 °, 15 °, or other angular values in the range of 3 ° to 15 °. In specific implementation, the axial rake angle of the main cutting edge 211 is preferably 0 °, and the radial rake angle is preferably 9 °, so that when the hole forming process is performed under the angle, the laminated composite material is less stripped, the chip breaking performance is strong, and the machined hole has better inlet and outlet morphology, thereby being beneficial to the stable and reliable assembly of the structural member.

The cutter can be applied to manual drilling equipment and mechanical machine tool equipment. It can be understood that the composite material laminated metal material is applied to the aerospace field, and because of the large volume of parts and complex space shape, the manual hole making is the most main processing mode at present, especially in the assembly site, the hole making quantity of single parts is large, and the processing time is long. Fig. 7 and 8 are schematic diagrams of rake angles at several positions on a main cutting edge of a conventional cutter, referring to fig. 7 and 8, the variation trend of the rake angle of the conventional cutter is that the larger the closer to an outer circle is, the smaller the closer to a center is, the outermost rake angle value of the main cutting edge 211 is close to a helix angle, in the cutting process of a drill bit, cutting force mutation exists, inlet tearing and vibration are easy to occur, and problems of unsmooth vibration, blocking and the like of the cutter exist, so that the stability of hole making is poor, the hole making is laborious, the precision and roundness of the whole hole size are difficult to ensure, the service life of the cutter is low, the processing efficiency and the cost are greatly influenced, and the working strength and the fatigue feeling of operators are also increased.

Fig. 9 is a schematic view of several positions on a main cutting edge of a tool according to an embodiment of the present utility model, fig. 10 is a rake angle schematic view of several positions on a main cutting edge, and referring to fig. 9 and 10, in the tool according to some embodiments, a rake surface of the main cutting edge 211 is subjected to thinning, and a rake angle obtained by thinning the rake surface of the main cutting edge 211 satisfies: the numerical variation of the rake angle gradually decreases from the axis of the blade portion 200 to the direction in which the radial distance increases, so that the problem of abrupt change of cutting force can be effectively solved, cutting dynamics is more stable, vibration can be effectively suppressed, and cutting stability is improved, so that the hole making process is smoother and more labor-saving, and the method is used for manually making holes and can help to reduce fatigue feeling of operators. On this basis, the chip breaking performance is improved by combining the optimization of the axial rake angle and the radial rake angle of the main cutting edge 211, and meanwhile, the damages of burrs, layering, splitting and the like in the hole making process can be effectively reduced by weakening the drilling stripping of the cutting edge, the hole making process inlet is good in quality, the damage is small, the metal outlet is free of flanging burrs, and the aperture precision and roundness are guaranteed.

In some embodiments of the tool, the radius of the edge portion 200 is R, and the rake angle of the rake surface of the main cutting edge 211 meets: the numerical variation of the rake angle is in the range of 0 ° to 0.3 ° from 0.4R to 0.9R from the axis of the blade portion 200. Compared with a conventional cutter, the change range of the rake angle value is smaller, the change of the rake angle value is more gentle, the cutting dynamic of the main cutting edge 211 is optimized, the smoothness and stability of hole making are improved, the vibration resistance is good, and the dimensional accuracy and roundness are guaranteed. For manual hole making, the vibration can be reduced to optimize operation feedback, so that the labor is saved, the fatigue is relieved, and the hole making efficiency and quality are ensured.

Specifically, as an example, the reference positions A, B, C, D, E may be sequentially taken on the main cutting edge 211 in a direction in which a radial distance from the axis of the edge portion 200 increases, wherein the position a is the center of the tip 210, and corresponds to the position of the axis of the edge portion 200. Specific reference location A, B, C, D, E spotting can be performed with reference to fig. 9, 10 and the following tables:

The position of the main cutting edge	A	B	C	D	E
						Ratio of radial distance from blade axis to blade radius	0	0.15	0.4	0.65	0.9

The values of the rake angles at the above reference positions are shown in fig. 10, wherein the rake angle at the position B is 3.2 °, the rake angle at the position C is-2.3 °, the rake angle at the position D is-2.1 °, and the rake angle at the position E is-2 °, and it is seen that the rake angle of the main cutting edge 211 varies smoothly, particularly between the reference positions C to E (i.e., from 0.4R to 0.9R from the axis of the edge portion 200), and the rake angle of the main cutting edge 211 varies by 0 ° to 0.3 °. As shown in fig. 11, the horizontal axis in fig. 11 is the position of the main cutting edge 211 in the direction of increasing the radial distance from the axis of the edge portion 200, the vertical axis is the rake value of the main cutting edge 211, and the above A, B, C, D, E reference positions on the main cutting edge 211 are used as reference points to form a rake value variation trend curve i of the main cutting edge 211 of the conventional tool and a rake value variation trend curve ii of the main cutting edge 211 of the embodiment of the present utility model. Curves i and ii clearly illustrate that the magnitude of the rake angle formed by the thinning of the rake surface of the main cutting edge 211 of the present embodiment of the utility model varies more gradually relative to conventional tools.

Fig. 12 is a schematic view showing the supporting state of the margin and the hole wall of the tool according to the embodiment of the present utility model, referring to fig. 12, in the tool according to some embodiments, the margin 200 includes at least three margins 230 extending from the tip 210 to the shank 100 spirally, and the margins 230 are spaced from each other, so that during the drilling stage between the time when the main cutting edge 211 is drilled and the time when the main cutting edge 211 is drilled, each margin 230 can form a contact support to the hole wall 300, at least three supporting points are formed, and the multi-point support structure can improve the cutting stability during the machining process, be beneficial to improving the hole diameter precision and the roundness of the hole, and improve the stability during the drilling process, and be beneficial to reducing the outlet flanging. In particular, referring to fig. 4 and 12, in some embodiments of the tool, the blade 200 includes a margin 230 and a back 220 extending helically from the tip 210 toward the handle 100, at least one back 220 having one margin 230 on each side, thereby forming a multi-margin 230 configuration. For example, blade 200 includes two spaced apart knife backs 220, one knife back 220 having one margin 230 and the other knife back 220 having two spaced apart margins 230, thereby forming three points of support for the hole wall 300, and a three point support structure provides enhanced support for improved hole accuracy and hole roundness.

On the basis of the embodiment, the multi-margin structure of the embodiment is combined, so that the smoothness and stability of hole making can be improved, the positive effect on optimizing operation feedback is achieved, and fatigue is reduced.

Fig. 13 is a schematic view of an embodiment of the present utility model when the tip is viewed along the axial direction, referring to fig. 13, in some embodiments, the tip 210 of the blade portion 200 includes a chisel edge 212 and two main cutting edges 211, the two main cutting edges 211 are symmetrically disposed relative to the axis of the blade portion 200, the two main cutting edges 211 are disposed at intervals, the chisel edge 212 is located between the two main cutting edges 211, and during drilling, the rotation of the chisel edge 212 can realize effective centering, so as to ensure the smooth entry of the subsequent main cutting edges 211.

It will be appreciated that the region between the chisel edge 212 and the two main cutting edges 211 has no cutting capability and may be referred to as the no cutting capability region 213. In general, the larger the no cutting capability region 213 on the tip 210, the more resistive and less sharp the drilling, and the more laborious the drilling. The size of the non-cutting capability region 213 may be represented by the size of a tangent circle between the two main cutting edges. In a further embodiment of the present utility model, the distance between the two main cutting edges 211 on the tip 210 is smaller than the length of the chisel edge 212, i.e. the diameter of the tangent circle between the two main cutting edges 211 is smaller than the diameter of the circle of revolution 214 of the chisel edge 212 (the diameter of the circle of revolution 214 of the chisel edge 212, i.e. the length of the chisel edge 212), which is concentric with the circle of revolution 214. Thus, at a given chisel edge 212 length, the no-cutting capacity area 213 between the two main cutting edges 211 and chisel edges 212 is reduced, thereby weakening drilling resistance and making drilling more labor-saving. On the basis of the above embodiment, by combining the distribution structure of the main cutting edge 211 and the chisel edge 212 in this embodiment, the sharpness of drilling can be improved, the centering capability can be enhanced, and the position accuracy of hole making can be improved. The weakening of drilling resistance also helps to promote the smoothness and stability of drilling, thereby playing a positive role in optimizing operation feedback and helping to alleviate fatigue.

It should be noted that, in addition to the vibration and effort conditions, the operation feedback in the hole making process affects the operation and hole making quality, including the conditions of blocking and forward punching, and the like, and a part of blocking generated during the operation is generated by chip breaking during the processing process, so that the chip breaking performance is optimized, and the blocking condition can be improved; the forward punch is mainly used in the drilling stage of the hole making process, the cutting stability is poor, the blade part 200 is punched outwards when not being cut in place in the drilling stage, the outlet flanging is caused, and the forward punch condition can be improved by optimizing the hole making stability and chip breaking performance.

The following are examples of processing tests performed on the tool of the embodiment of the present utility model using a conventional twist drill as a comparative example:

material of a member to be processed: 3.8mm T700 CFRP laminated 4mm aluminum plates 7050-T6.

Common processing equipment: 3000rpm pneumatic drill gun.

Two common hole making methods are: d2.55 bottom hole horizontal hole making and no bottom hole horizontal hole making.

Description of common injuries: common injuries such as inlet tears, outlet cuffs; therein, referring to fig. 14, the entrance tear condition is characterized by the difference L between the hole radius R ₀ and the hole tear maximum radius R ₁, i.e., l=r ₁-R₀, in mm. Referring to fig. 15, the outlet cuff is characterized by a cuff height H in mm.

Operational feedback description: the plurality of operators manually perform drilling processing by using the processing apparatus, and evaluate operation feedback of cutting operations performed by the respective drilling tools according to the following criteria: vibrating knife, clamping and forward punching: 1-3 points, the larger the number, the more severe. Laborious: a score of 1-5, the greater the number, the more severe, a score of 1 represents less effort and a score of 5 represents no access to the well.

Test one:

Hole forming was performed on 3.8mm T700 CFRP laminated 4mm aluminum plates 7050-T6, with D2.55 bottom holes, and horizontal hole forming tests were performed, with the operational feedback recorded in table 1 below, the hole damage recorded in table 2 below, and the hole morphology recorded in fig. 16.

Table 1: d2.55 bottom hole test record

Sequence number	Cutting tool	Vibration knife	Laborious work	Cartoon-like pattern	Front punch
						1	The tool of the utility model	2	1	2	1
2	Conventional twist drill	3	4	3	2

Table 2: d2.55 bottom hole test hole damage record

Sequence number	Cutting tool	Inlet tear L (mm)	Outlet flange H (mm)	Remarks
					1	The tool of the utility model	0.37	0.12
2	Conventional twist drill	3.2	0.19	Poor roundness

As can be seen from the results of the first test, the tool according to the embodiment of the present utility model was used for the machining test, compared with the conventional twist drill: from table 1, the vibration, effort, jamming and forward impact conditions during the operation are all reduced, and the operation feedback is optimized. As can be seen from table 2 above, the inlet tear L of the machined holes is significantly reduced and the outlet flange H is also reduced, thereby optimizing the hole making quality. Referring to fig. 16, a and b in fig. 16 are the inlet and outlet profiles, respectively, of the hole obtained by the above-described machining using the tool of the present utility model, and c and d in fig. 16 are the inlet and outlet profiles, respectively, of the hole obtained by the above-described machining using a conventional twist drill. As can be seen from a comparison of fig. 16 with c in combination with table 2, the hole entry tear L formed by machining using the tool of the present utility model was 0.37mm, with no apparent entry tear as seen with the naked eye in fig. 16, whereas the hole entry tear L formed by machining using a conventional twist drill was 3.2mm, with a visible entry tear as seen with c in fig. 16. As can be seen from a comparison of b and d in fig. 16, in combination with table 2, the hole formed by the tool of the present utility model has an outlet flange H of 0.12mm, a in fig. 16 has no obvious outlet flange, and d in fig. 16 has a clear flange, as can be seen from a comparison of 0.19mm by the conventional twist drill.

And II, testing:

Hole forming was performed on 3.8mm T700 CFRP laminated 4mm aluminum plates 7050-T6, and horizontal hole forming tests were performed without bottom holes, with the operational feedback recorded in table 3 below, the hole damage recorded in table 4 below, and the hole morphology recorded in fig. 17.

Table 3: bottomless hole test record

Sequence number	Cutting tool	Vibration knife	Laborious work	Cartoon-like pattern	Front punch
						1	The tool of the utility model	1	1	2	1
2	Conventional twist drill	1	4	3	2

Table 4: bottomless hole test hole damage record

Sequence number	Cutting tool	Inlet tear L (mm)	Outlet flange H (mm)	Remarks
					1	The tool of the utility model	0.13	0.08
2	Conventional twist drill	0.72	0.2	Outlet burr

As can be seen from the results of the second test, the cutter according to the embodiment of the present utility model was used for the processing test, compared with the conventional twist drill: as can be seen from table 3 above, the laborious, stuck and forward conditions of the operation process are reduced, optimizing the operation feedback. From the above table 4, it is clear that the inlet tear L of the hole formed by the processing is significantly reduced, and the outlet flange H is also reduced, thereby optimizing the hole making quality. Referring to fig. 17, wherein a and b in fig. 17 are the inlet and outlet profiles, respectively, of the hole obtained by the above-described machining using the tool of the present utility model, and c and d in fig. 17 are the inlet and outlet profiles, respectively, of the hole obtained by the above-described machining using a conventional twist drill. As can be seen from a comparison of fig. 17 with c, in combination with table 4, the hole entry tear L formed by machining using the tool of the present utility model was 0.13mm, with no apparent entry tear as seen with the naked eye in fig. 17, whereas the hole entry tear L formed by machining using a conventional twist drill was 0.72mm, with a visible entry tear as seen with the naked eye in fig. 17. As can be seen from a comparison of b and d in fig. 17, in combination with table 4, the hole formed by the tool of the present utility model has an outlet flange H of 0.08mm, a in fig. 17 has no obvious outlet flange, a hole formed by conventional twist drill processing has an outlet flange H of 0.2mm, d in fig. 17 has a obvious flange, and an outlet burr K exists.

The cutter of the embodiment of the utility model can effectively inhibit the defects of burrs, layering, tearing, flanging and the like when the laminated structure is perforated by improving the structure of the tip 210 of the cutter blade part 200, and improves the perforation quality. The method is suitable for hole making processing of the laminated structure of the carbon fiber composite material laminated metal material, and can be widely applied to the field of aerospace.

The embodiments of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the application and features of the embodiments may be combined with each other without conflict.

Claims

1. A tool for hole making of laminated materials, comprising:

a shank for mounting and securing the tool;

The cutting part is provided with a tip at one axial end, one end deviating from the tip is connected with the handle part, the tip comprises a chisel edge and two main cutting edges, the two main cutting edges are symmetrically arranged relative to the axis of the cutting part and are mutually spaced, the chisel edge is positioned between the two main cutting edges, and the distance between the two main cutting edges is smaller than the length of the chisel edge;

The main cutting edge is provided with an axial rake angle with a set angle and a radial rake angle with a positive angle, and is used for pressing down the surface layer material; the axial rake angle is in the range of-7 to 7 degrees, the radial rake angle is in the range of 3 to 15 degrees, and the rake face of the main cutting edge is subjected to grinding processing, and the ground axial rake angle meets the following conditions: the numerical variation of the axial rake angle gradually decreases from the axis of the blade to the direction of increasing radial distance, the radius of the blade is defined as R, and the numerical variation of the axial rake angle is in the range of 0 DEG to 0.3 DEG from 0.4R to 0.9R from the axis of the blade.

2. The tool according to claim 1, wherein the angle of the axial rake angle is 0 °.

3. The tool according to claim 1, wherein the radial rake angle is 9 °.

4. A tool according to any one of claims 1 to 3, wherein the edge portion comprises at least three lands extending helically from the tip to the shank, the lands being spaced apart from one another.

5. The tool of claim 4 wherein said blade includes said margin and a back extending helically from said tip to said shank, at least one of said back having one of said margins on each side thereof.