Hole making method and hole making cutter

Abstract

The invention discloses a hole making method and a hole making cutter. The hole making method comprises the steps that the hole diameter of a prefabricated hole is determined according to the hole diameter of a target hole; the plate is machined through the first milling part and the second milling part to form a prefabricated hole; a target hole is formed in the plate through the prefabricated hole; d1 is less than D-2K; d1 is the aperture of the prefabricated hole; d is the aperture of the target hole; k is a radius change value corresponding to the part, damaged in the radial direction of the target hole, of the plate when the target hole is directly milled in the plate; the central axis of the prefabricated hole and the central axis of the target hole are collinear. When the plate is a composite plate, layering of the composite plate and even tearing of part of the composite plate on the periphery of the target hole can be avoided, when the plate is a non-composite plate, part of the plate on the periphery of the target hole can be prevented from being damaged, the hole forming quality is good, the hole forming cost is low, and the service life of the first milling part and the second milling part can be prolonged; and secondly, a supporting structure does not need to be arranged in the peripheral area of the target hole in the plate, and the hole forming efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hole processing, in particular to a hole making method and a hole making tool. BACKGROUND

[0002] With the rapid development of modern equipment manufacturing industry, composite materials are widely used in aerospace, national defense and military industry and other fields. Among them, carbon fiber composite material is one of the composite materials that is used a lot. The carbon fiber composite board made of carbon fiber composite material is mostly made by stacking carbon fiber layers, and any two adjacent carbon fiber layers are bonded by a resin bonding layer to form a carbon fiber composite board.

[0003] At present, for composite board hole making, the hole making methods in the prior art are mainly divided into two categories: one is to use a drill bit for drilling processing, and the axial force applied to the carbon fiber composite board during the hole making process is large, which can easily cause the carbon fiber layer and the resin layer to be delaminated, and even cause the carbon fiber layer and / or the resin layer to be torn, thereby affecting the structural strength of the carbon fiber board and the assembly quality; the other is to use a end mill to perform hole making by using a spiral trajectory, which can effectively reduce the axial force applied to the carbon fiber composite board, but still causes the carbon fiber layer and the resin layer to be delaminated, and even causes the carbon fiber layer and / or the resin layer to be torn; secondly, in the actual hole making process, especially when the support structure cannot be arranged around the periphery of the hole making area along the thickness direction of the carbon fiber composite board, the defects of the above two hole making methods are more obvious. SUMMARY

[0004] The purpose of the present application is to provide a hole making method and a hole making tool to solve the above-mentioned problems existing in the hole making method of the prior art.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The hole making method and the hole making tool comprise a tool body, a first milling portion fixedly arranged on the front end surface of the tool body along the axial direction, and a second milling portion fixedly arranged on the front end periphery of the tool body along the axial direction; the center axis of the first milling portion and the center axis of the second milling portion are collinear, and the corresponding outer diameter of the first milling portion is equal to the corresponding outer diameter of the second milling portion; the hole making method comprises the following steps:

[0007] S100, determining the hole diameter of the pre-hole according to the hole diameter of the target hole;

[0008] Wherein, D1 < D-2K; D1 is the hole diameter of the pre-hole; D is the hole diameter of the target hole; k is the radius change value corresponding to the part damaged along the radial direction of the target hole when directly milling the target hole on the plate material;

[0009] S200, machining the plate material to form the preformed hole through the first milling part and the second milling part;

[0010] S300, machining the plate material to form a target hole through the preformed hole;

[0011] Wherein, the center axis of the preformed hole and the center axis of the target hole are collinear.

[0012] As a preferred solution of the above hole forming method, step S200 comprises:

[0013] S210, moving the cutter body to directly above the position on the plate material where the target hole is expected to be machined, and making the first milling part directly face the position on the plate material where the target hole is expected to be machined;

[0014] S220, controlling the cutter body to revolve around the fixed axis with a first set eccentricity e1, synchronously controlling the cutter body to rotate around its center axis, and synchronously controlling the cutter body to feed along its axial direction, machining the plate material to form the preformed hole through the first milling part and the second milling part;

[0015] Wherein, the first set eccentricity e1=(D1-d1) / 2; e1 is the first set eccentricity; d1 is the outer diameter corresponding to the second milling part; the fixed axis is collinear with the center axis of the target hole.

[0016] As a preferred solution of the above hole forming method, the outer periphery of the cutter body is further provided with a third milling part, the third milling part is away from the first milling part along the axial direction of the cutter body relative to the second milling part, the center axis of the third milling part is collinear with the center axis of the second milling part, and the outer diameter corresponding to the third milling part is smaller than the outer diameter corresponding to the second milling part; step S300 comprises:

[0017] S311, controlling the cutter body to initially revolve around the fixed axis with a second set eccentricity e2, and synchronously controlling the cutter body to rotate around its center axis, milling the preformed hole through the third milling part;

[0018] Wherein, e2=e1+(d1-d2) / 2; e2 is the second set eccentricity; d2 is the outer diameter corresponding to the third milling part; the fixed axis is collinear with the center axis of the target hole.

[0019] S312, increasing the eccentricity of the cutter body to a third set eccentricity e3, controlling the cutter body to revolve around the fixed axis with the third set eccentricity e3, and synchronously controlling the cutter body to rotate around its center axis, continuing to mill the preformed hole through the third milling part;

[0020] wherein the third set eccentricity e3 = e2 + n*△e; e3 is the third set eccentricity determined this time; △e is a single revolution radius variation, △e > 0; n is the number of times of increasing the third set eccentricity, n is an integer greater than or equal to 1;

[0021] S313, determining whether the target hole is finished according to the third set eccentricity e3;

[0022] If the target hole is not finished, return to step S312.

[0023] As a preferred scheme of the hole making method, step S313 comprises:

[0024] determining whether the third set eccentricity e3 is equal to [(D-d2) / 2];

[0025] If the third set eccentricity e3 is less than [(D-d2) / 2], it is determined that the target hole is not finished; if the third set eccentricity e3 is equal to [(D-d2) / 2], it is determined that the target hole is finished.

[0026] As a preferred scheme of the hole making method, the outer periphery of the cutter body is further provided with a third milling portion, the third milling portion is away from the first milling portion along the axial direction of the cutter body relative to the second milling portion, the central axis of the third milling portion is collinear with the central axis of the second milling portion, and the corresponding outer diameter of the third milling portion is smaller than the corresponding outer diameter of the second milling portion; step S300 comprises:

[0027] S321, controlling the cutter body to revolve around the fixed axis with a second set eccentricity e2, and synchronously controlling the cutter body to rotate around its central axis, to mill the pre-made hole by the third milling portion;

[0028] wherein e2 = e1 + (d1-d2) / 2; e2 is the second set eccentricity; d2 is the corresponding outer diameter of the third milling portion; the fixed axis is collinear with the central axis of the target hole;

[0029] S322, determining the feed speed f of the cutter body along the radial direction of the pre-made hole according to the hole diameter D of the target hole and the hole diameter D1 of the pre-made hole;

[0030] S323, controlling the cutter body to feed according to the feed speed f of the cutter body along the radial direction of the pre-made hole, synchronously controlling the cutter body to revolve around the fixed axis, and synchronously controlling the cutter body to rotate around its central axis, until the target hole is finished.

[0031] As a preferred solution of the above hole making method, the step S322 comprises:

[0032] The feeding speed f of the cutter body along the radial direction of the preformed hole = [(D-D1) / 2] / m;

[0033] Wherein, f is the feeding speed of the cutter body along the radial direction of the preformed hole; m is the total number of revolutions, m is an integer greater than or equal to 1.

[0034] The hole making cutter for implementing the above hole making method, the hole making cutter comprises a cutter body, a first milling portion is fixedly arranged on the front end surface of the cutter body along the axial direction, and a second milling portion is fixedly arranged on the front end outer periphery of the cutter body along the axial direction; the center axis of the first milling portion and the center axis of the second milling portion are collinear, and the corresponding outer diameter of the first milling portion is equal to the corresponding outer diameter of the second milling portion.

[0035] As a preferred solution of the above hole making cutter, the outer periphery of the cutter body is further provided with a third milling portion, the third milling portion is away from the first milling portion with respect to the second milling portion along the axial direction of the cutter body, the center axis of the third milling portion is collinear with the center axis of the second milling portion, and the corresponding outer diameter of the third milling portion is smaller than the corresponding outer diameter of the second milling portion.

[0036] As a preferred solution of the above hole making cutter, along the axial direction of the cutter body, the extension length L2 of the third milling portion is greater than the axial length of the target hole.

[0037] As a preferred solution of the above hole making cutter, along the axial direction of the cutter body, the sum L1 of the extension length of the first milling portion and the extension length of the second milling portion is less than the axial length of the target hole.

[0038] The beneficial effects of the present application are as follows:

[0039] The application provides a hole making method and a hole making tool. The hole making method comprises the following steps: determining the diameter of a pre-hole according to the diameter of a target hole; processing a pre-hole on a plate by a first milling part and a second milling part; processing the target hole on the plate by the pre-hole; wherein D1

[0040] Therefore, by using the hole making method, when the plate is a composite plate, the delamination of the composite plate and the tearing of the part of the composite plate around the target hole can be effectively avoided, when the plate is a non-composite plate, the damage of the part of the plate around the target hole can be effectively avoided, the hole making quality can be effectively improved, the hole making cost can be reduced, and the service life of the first milling part and the second milling part can be effectively prolonged; in addition, by using the hole making method, the supporting structure does not need to be arranged on the plate around the target hole, and the hole making efficiency can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structure schematic diagram of a hole making tool provided by an embodiment of the application;

[0042] Figure 2 and Figure 3 is a process diagram of processing a target hole on a plate by a hole making tool provided by an embodiment of the application;

[0043] Figure 4 is a principle of processing a target hole on a plate by a pre-hole provided by an embodiment of the application Figure 1 ;

[0044] Figure 5 is a principle of processing a target hole on a plate by a pre-hole provided by an embodiment of the application Figure 2 ;

[0045] Figure 6 is a flow of the hole making method provided by the embodiment of the present application Figure 1 ;

[0046] Figure 7 is a flow of the hole making method provided by the embodiment of the present application Figure 2 ;

[0047] Figure 8 is a flow of the hole making method provided by the embodiment of the present application Figure 3 .

[0048] In the drawings:

[0049] 1, cutter body; 11, first milling portion; 12, second milling portion; 13, third milling portion;

[0050] 2, retreat groove;

[0051] 3, connecting portion;

[0052] 100, plate; 110, preformed hole; 120, target hole. DETAILED DESCRIPTION

[0053] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0054] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0057] The present invention discloses a hole making tool, such as Figure 1 As shown, the hole-making tool includes a tool body 1, a first milling portion 11 being fixedly provided on the front end face of the tool body 1 in the axial direction, and a second milling portion 12 being fixedly provided on the outer periphery of the front end of the tool body 1 in the axial direction. The central axis of the first milling portion 11 and the central axis of the second milling portion 12 are collinear, and the outer diameter corresponding to the first milling portion 11 is equal to the outer diameter corresponding to the second milling portion 12. By providing the first milling portion 11 and the second milling portion 12, the tool body 1 can feed and mill the plate 100 in both the axial direction and the radial direction of the tool body 1. Thus, the tool body 1 can mill holes with a diameter equal to the outer diameter corresponding to the second milling portion 12, as well as holes with a diameter greater than the outer diameter corresponding to the second milling portion 12. Secondly, for expanding holes in composite plates, such a configuration can effectively reduce the axial force applied by the tool body 1 to the composite plate compared to drilling, thereby reducing the delamination of the composite plate and even the tearing of the periphery of the opening.

[0058] It is understandable that if Figure 1 As shown, the central axis of the tool body 1 , the central axis of the first milling portion 11 and the central axis of the second milling portion 12 are all collinear.

[0059] Preferably, in this embodiment, Figure 1 As shown, the second milling portion 12 extends axially along the tool body 1 to the front end surface of the tool body 1. This arrangement eliminates any gap between the first milling portion 11 and the second milling portion 12 along the axial direction of the tool body 1, effectively improving the efficiency of hole milling by the first milling portion 11 and the second milling portion 12. In other embodiments, the first milling portion 11 and the second milling portion 12 are spaced apart along the axial direction of the tool body 1.

[0060] Among them, such as Figure 1 As shown, the outer periphery of the tool body 1 is further provided with a third milling portion 13. The third milling portion 13 is axially spaced from the first milling portion 11 relative to the second milling portion 12 in the tool body 1. The central axis of the third milling portion 13 is collinear with the central axis of the second milling portion 12. The third milling portion 13 facilitates the radial expansion of the milled hole.

[0061] Preferably, in the present embodiment, as shown in Figure 1 It can be understood that the outer diameter corresponding to the third milling portion 13 is also smaller than the outer diameter corresponding to the first milling portion 11, which can effectively avoid the phenomenon that the first milling portion 11 and the second milling portion 12 continue to mill the composite plate, and even the part of the composite plate around the outer periphery of the hole is torn, and the like. In other embodiments, the outer diameter corresponding to the third milling portion 13 can be equal to the outer diameter corresponding to the second milling portion 12. In this way, by expanding the hole formed by the second milling portion 12 and / or the third milling portion 13, the axial length of the tool body 1 can be reduced, and the manufacturing cost of the tool body 1 can be reduced.

[0062] Preferably, in the present embodiment, as shown in Figures 1-3 It can be understood that the outer diameter corresponding to the third milling portion 13 is also smaller than the outer diameter corresponding to the first milling portion 11, which can effectively avoid the phenomenon that the first milling portion 11 and the second milling portion 12 continue to mill the composite plate, and even the part of the composite plate around the outer periphery of the hole is torn, and the like. In other embodiments, the outer diameter corresponding to the third milling portion 13 can be equal to the outer diameter corresponding to the second milling portion 12. In this way, by expanding the hole formed by the second milling portion 12 and / or the third milling portion 13, the axial length of the tool body 1 can be reduced, and the manufacturing cost of the tool body 1 can be reduced.

[0063] Preferably, in the present embodiment, as shown in Figures 1-3 It can be understood that the outer diameter corresponding to the third milling portion 13 is also smaller than the outer diameter corresponding to the first milling portion 11, which can effectively avoid the phenomenon that the first milling portion 11 and the second milling portion 12 continue to mill the composite plate, and even the part of the composite plate around the outer periphery of the hole is torn, and the like. In other embodiments, the outer diameter corresponding to the third milling portion 13 can be equal to the outer diameter corresponding to the second milling portion 12. In this way, by expanding the hole formed by the second milling portion 12 and / or the third milling portion 13, the axial length of the tool body 1 can be reduced, and the manufacturing cost of the tool body 1 can be reduced.

[0064] Preferably, as shown in Figure 1As shown, along the axial direction of the tool body 1, a tool relief groove 2 is provided between the second milling portion 12 and the third milling portion 13, and / or a tool relief groove 2 is provided on the end of the third milling portion 13 away from the second milling portion 12. If a tool relief groove 2 is provided between the second milling portion 12 and the third milling portion 13, it is convenient to process the second milling portion 12 and the third milling portion 13. If a tool relief groove 2 is provided on the end of the third milling portion 13 away from the second milling portion 12, it is convenient to process the third milling portion 13. In this embodiment, as Figure 1 As shown, preferably, a tool relief groove 2 is provided between the second milling portion 12 and the third milling portion 13 along the axial direction of the tool body 1 , and a tool relief groove 2 is provided on an end of the third milling portion 13 away from the second milling portion 12 .

[0065] Preferably, the first milling portion 11, the second milling portion 12, and the third milling portion 13 are all integrally formed with the tool body 1. This effectively improves the structural strength and service life of the tool body 1. The specific structures of the first milling portion 11, the second milling portion 12, and the third milling portion 13 are all prior art and will not be further described here.

[0066] Specifically, if Figures 1-3 As shown, the hole-making tool also includes a connecting portion 3 fixedly connected to the tool body 1. The connecting portion 3 is axially spaced from the second milling portion 12 relative to the third milling portion 13 along the tool body 1, and the central axis of the connecting portion 3 is collinear with the central axis of the tool body 1. The connecting portion 3 is connected to the output end of a driving mechanism, which is used to drive the connecting portion 3 to rotate about its own central axis, to revolve about a fixed axis, and to lift and translate the connecting portion 3. This arrangement enables the connecting portion 3 to drive the tool body 1 to rotate about its own central axis, to revolve about a fixed axis, and to lift and translate the tool body 1. For machining the target hole 120, the fixed axis is the central axis of the target hole 120. The driving mechanism comprises a lifting and translating slider mechanism and a rotational drive mechanism; alternatively, the driving mechanism can be a multi-axis robotic arm, etc. The specific structures of the lifting and translating slider mechanism, the rotational drive mechanism, and the multi-axis robotic arm are all prior art and will not be described in detail again.

[0067] Preferably, the connecting portion 3 is integrally formed with the tool body 1. This can reduce the number of parts, facilitate assembly and disassembly, and further enhance the structural strength of the hole-making tool.

[0068] The present invention also provides a hole-making method, which is implemented using the above-mentioned hole-making tool.

[0069] Among them, such as Figures 1-8 As shown, the hole making method includes:

[0070] S100, determine the hole diameter of the preformed hole 110 according to the hole diameter of the target hole 120.

[0071] D1<D-2K; D1 is the hole diameter of the preformed hole 110; D is the hole diameter of the target hole 120; k is the radius change value corresponding to the part of the plate 100 damaged along the radial direction of the target hole 120 when directly milling the target hole 120 on the plate 100.

[0072] S200, the preformed hole 110 is formed on the plate 100 by the first milling part 11 and the second milling part 12.

[0073] S300, the target hole 120 is formed on the plate 100 by the preformed hole 110.

[0074] As shown in Figures 1-5 the center axis of the preformed hole 110 and the center axis of the target hole 120 are collinear.

[0075] When drilling the plate 100, the radius change value k corresponding to the part of the plate 100 damaged along the radial direction of the target hole 120 when directly milling the target hole 120 on the plate 100 is determined according to the hole diameter of the target hole 120 in advance, and the hole diameter of the preformed hole 110 is determined according to k, that is, the hole diameter of the preformed hole 110 is determined according to D1<D-2K. In this way, when processing the target hole 120, the preformed hole 110 is processed at the position where the target hole 120 is expected to be processed on the plate 100, so that the preformed hole 110 processed will not cause damage to the plate 100 around the preformed hole 110. Even if the part of the plate 100 around the preformed hole 110 is damaged, since D1<D-2K, the part of the plate 100 damaged on the plate 100 can be completely milled and removed during the process of forming the target hole 120 on the plate 100 by the preformed hole 110, so that the outer periphery of the target hole 120 finally processed does not exist damaged phenomenon.

[0076] Therefore, by using the above drilling method, for the plate 100 being a composite plate, the phenomenon of the composite plate delamination or even the part of the plate 100 around the target hole 120 being torn can be further effectively avoided during the process of drilling the target hole 120, for the plate 100 being a non-composite plate, the phenomenon of the part of the plate 100 around the target hole 120 being damaged can be further effectively avoided, the drilling quality can be effectively improved, the drilling cost can be reduced, and the service life of the first milling part 11 and the second milling part 12 can be effectively improved. Secondly, by using the above drilling method, it is not necessary to set a supporting structure on the plate 100 around the target hole 120, and the drilling efficiency can be effectively improved.

[0077] It can be understood that k is different for different material types of the plate 100. K is an empirical value obtained from a large number of previous tests.

[0078] In the embodiment, the plate 100 is exemplarily taken as a composite plate.

[0079] Specifically, in the embodiment, as shown in Figure 2 、 Figure 4 and Figure 5 , the step S200 preferably comprises:

[0080] S210, moving the cutter body 1 to directly above the position of the target hole 120 to be machined on the plate 100, and making the first milling portion 11 directly face the position of the target hole 120 to be machined on the plate 100.

[0081] Wherein, the first milling portion 11 directly facing the position of the target hole 120 to be machined on the plate 100 means that the central axis of the first milling portion 11 is collinear with the central axis of the target hole 120 to be machined on the plate 100.

[0082] S220, controlling the cutter body 1 to revolve around the fixed axis with the first set eccentricity e1, synchronously controlling the cutter body 1 to rotate around its central axis, and synchronously controlling the cutter body 1 to feed along its axial direction, and machining the plate 100 by the first milling portion 11 and the second milling portion 12 to form the preformed hole 110.

[0083] Wherein, the first set eccentricity e1=(D1-d1) / 2; e1 is the first set eccentricity; d1 is the outer diameter corresponding to the second milling portion 12.

[0084] Wherein, the eccentricity refers to the straight-line distance between the fixed axis and the central axis of the cutter body 1.

[0085] It can be understood that d1

[0086] As an alternative, step S220 comprises: controlling the cutter body 1 to rotate around the center axis of itself, and synchronously controlling the cutter body 1 to feed along the axis of itself, to process the plate 100 to form the preformed hole 110 by the first milling part 11 and the second milling part 12; wherein the corresponding outer diameter d1 of the second milling part 12 is equal to the diameter of the preformed hole 110. It is also possible to first process the preformed hole 110 at the position of the expected target hole 120 on the plate 100.

[0087] Specifically, in the present embodiment, as shown in Figure 3 、 Figure 4 、 Figure 6 and Figure 7 , step S300 comprises:

[0088] S311, controlling the cutter body 1 to initially revolve around the axis of revolution with the second set eccentricity e2, and synchronously controlling the cutter body 1 to rotate around the center axis of itself, to mill the preformed hole 110 by the third milling part 13.

[0089] Wherein, e2=e1+(d1-d2) / 2; e2 is the second set eccentricity; d2 is the corresponding outer diameter of the third milling part 13.

[0090] S312, increasing the eccentricity of the cutter body 1 to the third set eccentricity e3, controlling the cutter body 1 to revolve around the axis of revolution with the third set eccentricity e3, and synchronously controlling the cutter body 1 to rotate around the center axis of itself, to continue milling the preformed hole 110 by the third milling part 13.

[0091] Wherein, the third set eccentricity e3=e2+n*△e; e3 is the third set eccentricity determined this time; △e is the single revolution radius change amount, △e>0; n is the number of times of increasing the third set eccentricity, n is an integer greater than or equal to 1.

[0092] It can be understood that when the cutter body 1 is initially controlled to revolve around the axis of revolution with the second set eccentricity e2, the eccentricity of the cutter body 1 is increased. The first time the eccentricity of the cutter body 1 is increased, the third set eccentricity e3=e2+1*△e; the second time the eccentricity of the cutter body 1 is increased, the third set eccentricity e3=e2+2*△e; the third time the eccentricity of the cutter body 1 is increased, the third set eccentricity e3=e2+3*△e; the fourth time the eccentricity of the cutter body 1 is increased, the third set eccentricity e3=e2+4*△e;…; the n time the eccentricity of the cutter body 1 is increased, the third set eccentricity e3=e2+n*△e.

[0093] S313, determining whether the target hole 120 is processed according to the third set eccentricity e3.

[0094] Specifically, as shown inFigure 3 、 Figure 5 、 Figure 6 and Figure 8 As shown in FIG. 13, step S313 comprises:

[0095] Determining whether the third set eccentricity e3 is equal to [(D-d2) / 2].

[0096] If the third set eccentricity e3 is less than [(D-d2) / 2], it is determined that the target hole 120 is not machined completely. Then, returning to step S312. Until the third set eccentricity e3 is equal to [(D-d2) / 2], it is determined that the target hole 120 is machined completely.

[0097] If the third set eccentricity e3 is equal to [(D-d2) / 2], it is determined that the target hole 120 is machined completely. Then, ending the machining of the target hole 120 on the plate 100. Machining the target hole 120 again at other positions of the plate 100 where the target hole 120 is expected to be machined according to steps S100 to S300; or, controlling the cutter to move away from the plate 100.

[0098] Specifically, in the embodiment, △e=(D-D1) / 2n.

[0099] Thus, the target hole 120 is machined on the plate 100 through the preformed hole 110, and the service life of the third milling part 13 can be effectively improved.

[0100] As an alternative, step S300 comprises:

[0101] S321, controlling the cutter body 1 to revolve around the fixed axis with a second set eccentricity e2, and synchronously controlling the cutter body 1 to rotate around its own central axis, so as to mill the preformed hole 110 through the third milling part 13.

[0102] Wherein, e2=e1+(d1-d2) / 2; e2 is the second set eccentricity; d2 is the outer diameter corresponding to the third milling part 13.

[0103] S322, determining the feeding speed f of the cutter body 1 along the radial direction of the preformed hole 110 according to the hole diameter D of the target hole 120 and the hole diameter D1 of the preformed hole 110.

[0104] Specifically, step S322 comprises:

[0105] The feeding speed f of the cutter body 1 along the radial direction of the preformed hole 110 is [(D-D1) / 2] / m.

[0106] Wherein, f is the feeding speed of the cutter body 1 along the radial direction of the preformed hole 110; m is the total number of revolutions, and m is an integer greater than or equal to 1.

[0107] S323, controlling the tool body 1 to feed according to the feeding speed f of the tool body 1 along the radial direction of the preformed hole 110, synchronously controlling the tool body 1 to revolve around the fixed axis, and synchronously controlling the tool body 1 to rotate around the central axis of the tool body 1 until the target hole 120 is completely machined.

[0108] Specifically, the step S323 comprises:

[0109] Controlling the tool body 1 to feed according to the feeding speed f of the tool body 1 along the radial direction of the preformed hole 110, synchronously controlling the tool body 1 to revolve around the fixed axis, and synchronously controlling the tool body 1 to rotate around the central axis of the tool body 1.

[0110] Real-time judging whether (2f*m+D1) is equal to the hole diameter D of the target hole 120.

[0111] If (2f*m+D1) is less than the hole diameter D of the target hole 120, it is determined that the target hole 120 is not completely machined. Then, the tool body 1 is continuously controlled to revolve around the fixed axis according to the feeding speed until (2f*m+D1) is equal to the hole diameter D of the target hole 120.

[0112] If (2f*m+D1) is equal to the hole diameter D of the target hole 120, it is determined that the target hole 120 is completely machined. Then, the machining of the target hole 120 on the plate 100 is ended. The target hole 120 is machined again at other positions of the plate 100 where the target hole 120 is expected to be machined according to the steps S100 to S300; or, the tool is controlled to move away from the plate 100.

[0113] Thus, the target hole 120 is machined on the plate 100 through the preformed hole 110, and the service life of the third milling part 13 is effectively improved.

[0114] Preferably, after the target hole 120 is machined, the tool body 1 is controlled to continue revolving around the fixed axis for at least one circle. Thus, the machining precision of the target hole 120 is ensured. That is, after the target hole 120 is machined, the tool body 1 is controlled to continue revolving around the fixed axis for at least one circle with an eccentricity equal to [(D-d2) / 2].

[0115] Specifically, in the embodiment, the target hole 120 with a diameter of 20mm is machined on the plate 100 with a thickness of 40mm, and the value of k is 3.4mm.

[0116] When the step S100 is performed, the hole diameter D1 of the preformed hole 110 needs to be less than 33.2mm, and the hole diameter D1 of the preformed hole 110 is exemplarily taken as 13mm. It can be understood that the smaller the value of the hole diameter D1 of the preformed hole 110, the better the effect of avoiding the delamination of the composite plate and even the tearing of the part of the composite plate around the outer periphery of the preformed hole 110 when the preformed hole 110 is machined.

[0117] In the step S200, the first milling part 11 corresponds to the outer diameter equal to the second milling part 12 corresponding to the outer diameter, and the first milling part 11 corresponding to the outer diameter and the second milling part 12 corresponding to the outer diameter are both smaller than the hole diameter D1 of the preformed hole 110, and the second milling part 12 corresponding to the outer diameter d1 is 10mm. Along the axial direction of the cutter body 1, the sum of the extension length of the first milling part 11 and the extension length of the second milling part 12 L1 is smaller than the axial length of the target hole 120, and the sum of the extension length of the first milling part 11 and the extension length of the second milling part 12 L1 is 20mm.

[0118] In the step S300, the third milling part 13 corresponds to the outer diameter smaller than the second milling part 12 corresponding to the outer diameter, and the third milling part 13 corresponding to the outer diameter d1 is 9mm. Along the axial direction of the cutter body 1, the extension length L2 of the third milling part 13 is greater than the axial length of the target hole 120, and the extension length L2 of the third milling part 13 is 50mm. The △e=2.5mm, n=4.

[0119] Specifically, for the target hole 120 formed by the steps S321 to S323, the f is 2.5mm / turn, and m=4.

[0120] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A hole making method, characterized in that: A hole-making tool comprises a tool body (1), wherein a first milling portion (11) is fixedly provided on the front end face of the tool body (1) in the axial direction, and a second milling portion (12) is fixedly provided on the outer periphery of the front end of the tool body (1) in the axial direction; the central axis of the first milling portion (11) and the central axis of the second milling portion (12) are collinear, and the outer diameter corresponding to the first milling portion (11) is equal to the outer diameter corresponding to the second milling portion (12); and the hole-making method comprises: S100, determining the aperture of the prefabricated hole (110) according to the aperture of the target hole (120); Wherein, D1<D-2K; D1 is the aperture of the prefabricated hole (110); D is the aperture of the target hole (120); k is the radius change value corresponding to the portion of the plate (100) damaged along the radial direction of the target hole (120) when the target hole (120) is directly milled on the plate (100); S200, processing the plate (100) by the first milling part (11) and the second milling part (12) to form the prefabricated hole (110); S300, forming a target hole (120) on the plate (100) through the prefabricated hole (110); Wherein, the central axis of the prefabricated hole (110) and the central axis of the target hole (120) are collinear.

2. The hole making method according to claim 1, characterized in that: Step S200 includes: S210, moving the tool body (1) to a position on the plate (100) directly above the position where the target hole (120) is expected to be machined, and making the first milling portion (11) face the position on the plate (100) where the target hole (120) is expected to be machined; S220, controlling the tool body (1) to revolve around a fixed axis with a first set eccentricity e1, synchronously controlling the tool body (1) to rotate around its own central axis, and synchronously controlling the tool body (1) to feed along its own axial direction, and processing the plate (100) to form the prefabricated hole (110) through the first milling part (11) and the second milling part (12); The first set eccentricity e1=(D1-d1) / 2; e1 is the first set eccentricity; d1 is the outer diameter corresponding to the second milling portion (12); and the fixed axis is collinear with the central axis of the target hole (120).

3. The hole making method according to any one of claims 1 to 2, characterized in that: The outer periphery of the tool body (1) is further provided with a third milling portion (13), the third milling portion (13) being away from the first milling portion (11) relative to the second milling portion (12) along the axial direction of the tool body (1), the central axis of the third milling portion (13) being collinear with the central axis of the second milling portion (12), and the outer diameter corresponding to the third milling portion (13) being smaller than the outer diameter corresponding to the second milling portion (12); step S300 comprises: S311, controlling the tool body (1) to initially revolve around a fixed axis at a second set eccentricity e2, and synchronously controlling the tool body (1) to rotate around its own central axis, and milling the prefabricated hole (110) through the third milling part (13); Wherein, e2=e1+(d1-d2) / 2; e2 is the second set eccentricity; d2 is the corresponding outer diameter of the third milling portion (13); the fixed axis and the central axis of the target hole (120) are collinear; S312, increasing the eccentricity of the tool body (1) to a third set eccentricity e3, controlling the tool body (1) to revolve around the fixed axis at the third set eccentricity e3, and synchronously controlling the tool body (1) to rotate around its own central axis, and continuing to mill the prefabricated hole (110) through the third milling portion (13); The third set eccentricity e3=e2+n*Δe; e3 is the third set eccentricity determined this time; Δe is the change in the single revolution radius, Δe>0; n is the number of times the third set eccentricity is increased, and n is an integer greater than or equal to 1; S313, determining whether the target hole (120) is completed according to the third set eccentricity e3; If the target hole (120) is not processed, the process returns to step S312.

4. The hole making method according to claim 3, characterized in that: Step S313 includes: Determine whether the third set eccentricity e3 is equal to [(D-d2) / 2]; If the third set eccentricity e3 is less than [(D-d2) / 2], it is determined that the target hole (120) is not processed; if the third set eccentricity e3 is equal to [(D-d2) / 2], it is determined that the target hole (120) is processed.

5. The hole making method according to any one of claims 1 to 2, characterized in that: The outer periphery of the tool body (1) is further provided with a third milling portion (13), the third milling portion (13) being away from the first milling portion (11) relative to the second milling portion (12) along the axial direction of the tool body (1), the central axis of the third milling portion (13) being collinear with the central axis of the second milling portion (12), and the outer diameter corresponding to the third milling portion (13) being smaller than the outer diameter corresponding to the second milling portion (12); step S300 comprises: S321, controlling the tool body (1) to initially revolve around a fixed axis at a second set eccentricity e2, and synchronously controlling the tool body (1) to rotate around its own central axis, and milling the prefabricated hole (110) through the third milling part (13); Wherein, e2=e1+(d1-d2) / 2; e2 is the second set eccentricity; d2 is the corresponding outer diameter of the third milling portion (13); the fixed axis and the central axis of the target hole (120) are collinear; S322, determining a feed speed f of the tool body (1) along the radial direction of the preformed hole (110) based on the hole diameter D of the target hole (120) and the hole diameter D1 of the preformed hole (110); S323, controlling the feed of the tool body (1) according to the radial feed speed f of the tool body (1) along the prefabricated hole (110), synchronously controlling the tool body (1) to revolve around the fixed axis, and synchronously controlling the tool body (1) to rotate around its own central axis until the target hole (120) is processed.

6. The hole making method according to claim 5, characterized in that: Step S322 includes: The feed speed f of the tool body (1) along the radial direction of the prefabricated hole (110) = [(D-D1) / 2] / m; Wherein, f is the feed speed of the tool body (1) along the radial direction of the prefabricated hole (110); m is the total number of revolutions, and m is an integer greater than or equal to 1.

7. Hole making tool, characterized in that, Used to implement the hole-making method described in any one of claims 1 to 6, the hole-making tool includes a tool body (1), a first milling portion (11) is fixedly provided on the front end face of the tool body (1) along the axial direction, and a second milling portion (12) is fixedly provided on the outer periphery of the front end of the tool body (1) along the axial direction; the central axis of the first milling portion (11) and the central axis of the second milling portion (12) are collinear, and the outer diameter corresponding to the first milling portion (11) is equal to the outer diameter corresponding to the second milling portion (12).

8. The hole making tool according to claim 7, characterized in that: A third milling portion (13) is further provided on the outer periphery of the tool body (1), and the third milling portion (13) is away from the first milling portion (11) relative to the second milling portion (12) along the axial direction of the tool body (1), the central axis of the third milling portion (13) is collinear with the central axis of the second milling portion (12), and the outer diameter corresponding to the third milling portion (13) is smaller than the outer diameter corresponding to the second milling portion (12).

9. The hole making tool according to claim 8, characterized in that: Along the axial direction of the tool body (1), an extension length L2 of the third milling portion (13) is greater than an axial length of the target hole (120).

10. The hole making tool according to any one of claims 7 to 9, characterized in that: Along the axial direction of the tool body (1), the sum L1 of the extension length of the first milling portion (11) and the extension length of the second milling portion (12) is smaller than the axial length of the target hole (120).

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