Boring tool

Abstract

A boring tool comprises a tool holder, an eccentric part fixedly connected to one end of the tool holder, an axis of the eccentric part being offset from an axis of the tool holder, a tool seat sleeved on the eccentric part and rotatable relative to the eccentric part, and a boring insert arranged in the tool seat and having one end extending out of the tool seat along a radial direction of the tool holder, the tool seat being used to drive the boring insert to rotate relative to the eccentric part so as to adjust a radial infeed amount of the boring insert. The boring tool can adjust the radial infeed amount of the boring insert by driving the tool seat to rotate relative to the eccentric part, thereby adjusting a machining size of a hole on a workpiece and being able to adapt to machining of holes with different sizes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hole machining, in particular to a boring tool. BACKGROUND

[0002] With the continuous development of science and technology, the precision machining demand of various workpieces is higher and higher. For example, metal cutting machining has gradually developed from ordinary rough machining to fine machining and super fine machining. In the machining process, because the quality of the hole after machining is good and the efficiency is high, the boring and milling process can become a common machining method for hole precision machining.

[0003] The current boring tool is composed of a tool shank and a boring insert. The boring insert is connected to the tool shank, and one end of the boring insert extends out of the tool shank along the radial direction of the tool shank to machine holes on workpieces. However, because the length of the one end of the boring insert extending out of the tool shank along the radial direction of the tool shank is fixed, the machining size of the hole on the workpiece is also fixed, which is difficult to adapt to the machining of holes of different sizes. SUMMARY

[0004] In view of the above, it is necessary to provide a boring tool to adapt to holes of different machining sizes on workpieces.

[0005] An embodiment of the present application provides a boring tool, comprising: a tool shank; an eccentric part fixedly connected to one end of the tool shank, an axis of the eccentric part deviating from an axis of the tool shank; a tool holder sleeved on the eccentric part and rotatable relative to the eccentric part; and a boring insert arranged in the tool holder, one end of the boring insert extending out of the tool holder along the radial direction of the tool shank, the tool holder being used to drive the boring insert to rotate relative to the eccentric part to adjust the radial feed amount of the boring insert.

[0006] The boring tool described above can adjust the radial feed amount of the boring insert by driving the tool holder to rotate relative to the eccentric part, thereby adjusting the machining size of the hole on the workpiece and adapting to the machining of holes of different sizes.

[0007] In some embodiments, a stop sub-groove is formed in the outer periphery of the eccentric part, a through hole is arranged at a position corresponding to the stop sub-groove of the tool holder, and the boring tool further comprises a locking piece, the locking piece passing through the through hole and the stop sub-groove and abutting against the eccentric part to lock the tool holder and the eccentric part.

[0008] In this way, when it is necessary to adjust the radial feed amount of the boring insert, the locking piece is first disassembled, then the tool holder is rotated relative to the eccentric part by a preset angle, and then the locking piece passes through the through hole and the stop sub-groove and abuts against the eccentric part, thereby locking the tool holder and the eccentric part.

[0009] In some embodiments, one side of the tool holder is provided with a chute, the boring insert is slidably arranged in the chute, the boring insert is provided with a waist hole, the boring hole cutter further comprises a connecting member, the connecting member passes through the waist hole and the chute and abuts against the tool holder to connect the boring insert and the tool holder, and the boring insert is used to slide in the chute by a preset distance and connect the boring insert and the tool holder through the connecting member to adjust the radial feed amount of the boring insert.

[0010] In this way, when the radial feed amount of the boring insert needs to be adjusted, the connecting member is first disassembled, then the boring insert is slid in the chute by a preset length, and then the connecting member passes through the waist hole and the chute and abuts against the tool holder to connect the boring insert and the tool holder.

[0011] In some embodiments, a protruding portion is protrudingly arranged on the chute, the protruding portion is arranged in the waist hole, and the connecting member passes through the waist hole and is connected to the protruding portion.

[0012] In this way, the protruding portion can guide the sliding of the boring insert in the chute of the tool holder and can be connected to the connecting member.

[0013] In some embodiments, the outer periphery of the tool holder is provided with an abutting portion, a plurality of scale lines are arranged at intervals on the outer periphery of the abutting portion, one side of the tool holder abuts against the abutting portion, and one side of the tool holder close to the abutting portion is provided with a reference line, the abutting portion is used to rotate relative to the tool holder to rotate the abutting portion relative to the reference line of the tool holder by a preset scale line to represent the radial feed amount of the boring insert.

[0014] In this way, since the axis of the eccentric portion deviates from the axis of the tool holder, by rotating the tool holder relative to the abutting portion, the abutting portion can be rotated relative to the reference line of the tool holder by a preset scale line, so as to accurately represent the radial feed amount of the boring insert.

[0015] In some embodiments, a plurality of mark lines are arranged on one side of the boring insert close to the tool holder, and the boring insert is used to slide in the chute to slide the boring insert relative to the reference line of the tool holder by a preset mark line to represent the radial feed amount of the boring insert.

[0016] In this way, by sliding the boring insert in the chute, the boring insert can be slid relative to the reference line of the tool holder by a preset mark line, so as to accurately represent the radial feed amount of the boring insert.

[0017] In some embodiments, the radial feed amount of the boring insert satisfies the following relationship: (r+X) 2 = H 2 +(r+H) 2-2*H*(r+H)*cosα; wherein, r is a distance between a tool tip of the boring tool and a center of the tool holder when the boring tool is in the first position, X is a radial feed amount of the boring tool when the boring tool is rotated from the first position to the second position, H is a distance between the center of the eccentric part and the center of the tool holder, and a is a rotation angle of the tool holder when the boring tool is rotated from the first position to the second position.

[0018] Thus, by the above formula and adjusting the rotation angle a of the tool holder when the boring tool is rotated from the first position to the second position, the radial feed amount of the boring tool can be calculated.

[0019] In some embodiments, the axial rake angle of the boring tool ranges from 6 degrees to 10 degrees.

[0020] Thus, while ensuring the sharpness of the tool tip of the boring tool, the chip removal is made more smooth, and the high strength of the tool tip of the boring tool is also taken into account.

[0021] In some embodiments, the radial rake angle of the boring tool ranges from 5 degrees to 10 degrees.

[0022] Thus, while ensuring the sharpness of the tool tip of the boring tool, the chip removal is made more smooth, and the high strength of the tool tip of the boring tool is also taken into account.

[0023] In some embodiments, the relief angle of the boring tool ranges from 5 degrees to 9 degrees.

[0024] Thus, the strength of the boring tool is ensured, the friction between the boring tool and the machined surface of the workpiece is reduced, and the service life of the boring tool is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a boring tool according to an embodiment of the present application.

[0026] Figure 2 is a schematic diagram of a boring tool according to an embodiment of the present application. Figure 1 is a schematic diagram of an exploded structure of the boring tool shown in

[0027] Figure 3 is a schematic diagram of a boring tool according to an embodiment of the present application. Figure 2 is a schematic diagram of a boring tool according to an embodiment of the present application.

[0028] Figure 4 is a schematic diagram of a boring tool according to an embodiment of the present application. Figure 1 is a schematic diagram of the boring tool shown in

[0029] Figure 5 is a schematic diagram of a boring tool according to an embodiment of the present application. Figure 1 is a schematic diagram of a boring tool according to an embodiment of the present application.

[0030] Figure 6 yes Figure 1 A schematic diagram of the radial rake angle of the boring insert in the boring tool shown.

[0031] Figure 7 This is a flowchart illustrating the adjustment method of a boring tool according to an embodiment of this application.

[0032] Figure 8 This is an exploded structural diagram of the boring tool and pre-adjustment fixture proposed in an embodiment of this application.

[0033] Figure 9 yes Figure 8 A schematic diagram of the assembly structure of the boring tool and the pre-adjustment fixture.

[0034] Explanation of main component symbols

[0035] Boring tool 100

[0036] Handle 10

[0037] Eccentric part 20

[0038] Stop slot 22

[0039] Knife holder 30

[0040] Connecting hole 32

[0041] Inclined groove 34

[0042] Protrusion 36

[0043] Reference line 38

[0044] Flattened part 39

[0045] Boring blade 40

[0046] Waist hole 42

[0047] Marker line 44

[0048] Locking part 50

[0049] Connector 60

[0050] Resistance Department 70

[0051] Scale line 72

[0052] Pre-adjusted fixture 200

[0053] First surface 210

[0054] Second surface 220

[0055] Container 230

[0056] Limiting groove 240

[0057] Pre-groove 250

[0058] Directional restriction groove 260 DETAILED DESCRIPTION

[0059] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by the same or similar reference signs, and the embodiments described below are examples for explaining the present application, and are not intended to limit the present application.

[0060] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0061] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or 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-mentioned term in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a 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, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0063] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0064] Please refer to Figure 1 and Figure 2 , Figure 1 is a perspective structural schematic diagram of a boring tool 100 according to an embodiment of the present application. Figure 2 is Figure 1 an exploded structural schematic diagram of the boring tool 100 shown in FIG. 1. An embodiment of the present application proposes a boring tool 100 for machining a hole in a workpiece (not shown). The boring tool 100 includes a tool shank 10, an eccentric portion 20, a tool holder 30, and a boring blade 40.

[0065] The tool shank 10 is cylindrical. The eccentric portion 20 is fixedly connected to one end of the tool shank 10, and the axis L1 of the eccentric portion 20 deviates from the axis L2 of the tool shank 10, i.e. the axis L1 of the eccentric portion 20 and the axis L2 of the tool shank 10 do not coincide. The tool holder 30 is sleeved on the eccentric portion 20 and can rotate relative to the eccentric portion 20. The boring blade 40 is arranged in the tool holder 30, and one end of the boring blade 40 protrudes out of the tool holder 30 along the radial direction of the tool shank 10. The tool holder 30 is used to drive the boring blade 40 to rotate relative to the eccentric portion 20 to adjust the radial infeed amount of the boring blade 40.

[0066] The boring tool 100 described above can adjust the radial infeed amount of the boring blade 40 by driving the boring blade 40 to rotate relative to the eccentric portion 20, thereby adjusting the machining size of the hole on the workpiece, and can adapt to the machining of holes of different sizes, thereby expanding the application range of the boring tool 100.

[0067] In the embodiment, the material of the shank 10 is medium carbon quenched and tempered steel, which has good low-temperature impact toughness. It can be understood that in other embodiments, the shank 10 can also be made of other materials, such as stainless steel, aluminum alloy.

[0068] In the embodiment, the diameter of the shank 10 is 6 mm, so that the shank 10 can be conveniently clamped by the main shaft, thereby machining a hole of a required size on the workpiece. It can be understood that in other embodiments, the diameter of the shank 10 can also be 5 mm or 7 mm, but is not limited thereto.

[0069] In the embodiment, the diameter of the hole machined on the workpiece is 13.95 mm-14.05 mm. It can be understood that in other embodiments, the diameter of the hole machined on the workpiece is 10 mm or 15 mm, but is not limited thereto.

[0070] In the embodiment, the eccentric portion 20 is cylindrical. It can be understood that in other embodiments, the eccentric portion 20 can be prismatic or cuboid, but is not limited thereto.

[0071] In the embodiment, the diameter of the shank 10 is greater than the diameter of the eccentric portion 20, for example, the diameter of the eccentric portion 20 is 4 mm. It can be understood that in other embodiments, the diameter of the shank 10 can be equal to or less than the diameter of the eccentric portion 20.

[0072] In the embodiment, the shank 10 and the eccentric portion 20 are integrally formed by stamping or casting. It can be understood that in other embodiments, the shank 10 and the eccentric portion 20 are first obtained in a separate structure by stamping or casting, and then the shank 10 and the eccentric portion 20 are connected together by welding or bolt fixing.

[0073] In the embodiment, the boring blade 40 can be a structure made of a recycled old tungsten steel shank, so that the cost of the boring blade 40 can be reduced. It can be understood that in other embodiments, the boring blade 40 can also be made of other materials, such as stainless steel, aluminum alloy.

[0074] The material of the machined workpiece is high-strength aluminum alloy, for example, the tensile strength of the aluminum alloy is 524 MPa. It can be understood that in other embodiments, the machined workpiece can also be made of other materials, such as stainless steel.

[0075] In some embodiments, the axis L1 of the eccentric portion 20 deviates from the axis L2 of the shank 10 by a range of 0.04mm-0.05mm. In this way, the diameter range of the hole processed by the boring tool 100 can be expanded. However, when the axis L1 of the eccentric portion 20 deviates from the axis L2 of the shank 10 by less than 0.04mm, the boring tool 100 is difficult to manufacture. When the axis L1 of the eccentric portion 20 deviates from the axis L2 of the shank 10 by more than 0.05mm, although the difficulty of manufacturing the boring tool 100 is reduced, the size of the processed hole is too large and is not suitable for processing requirements.

[0076] Please see Figure 3 , Figure 3 is Figure 2 the boring tool 100 shown in the perspective structural schematic view of the tool holder 30. In some embodiments, the outer periphery of the eccentric portion 20 is provided with a secondary stop groove 22, the secondary stop groove 22 is annular, the tool holder 30 is provided with a through hole 32 corresponding to the position of the secondary stop groove 22, and the boring tool 100 further comprises a locking member 50, the locking member 50 passes through the through hole 32 and the secondary stop groove 22 and abuts against the groove bottom of the secondary stop groove 22 of the eccentric portion 20, so as to lock the tool holder 30 and the eccentric portion 20.

[0077] When it is necessary to adjust the radial feed amount of the boring insert 40, the locking member 50 is first disassembled, and then the tool holder 30 is rotated by a preset angle relative to the eccentric portion 20. It can be understood that the preset angle can be set according to actual needs, which is not specifically limited here. Then the locking member 50 is made to pass through the through hole 32 and the secondary stop groove 22 again and abut against the groove bottom of the secondary stop groove 22 of the eccentric portion 20, so as to lock the tool holder 30 and the eccentric portion 20.

[0078] In the present embodiment, the locking member 50 is a bolt. It can be understood that in other embodiments, the locking member 50 can also be other structures, as long as it can pass through the through hole 32 and the secondary stop groove 22 and abut against the groove bottom of the secondary stop groove 22 of the eccentric portion 20, and lock the tool holder 30 and the eccentric portion 20.

[0079] In some embodiments, one side of the tool holder 30 is provided with an inclined groove 34, two opposite groove walls of the inclined groove 34 penetrate the side surface of the tool holder 30, the upper groove wall of the inclined groove 34 and the lower groove wall of the inclined groove 34 are both planes and are arranged in parallel, and the included angle between the upper groove wall of the inclined groove 34 and the lower groove wall of the inclined groove 34 and the horizontal plane is an acute angle. The boring insert 40 is slidingly arranged in the inclined groove 34, the boring insert 40 is provided with a waist hole 42, and the boring tool 100 further comprises a connecting member 60, the connecting member 60 passes through the waist hole 42 and the inclined groove 34 and abuts against the tool holder 30 to connect the boring insert 40 and the tool holder 30. The boring insert 40 is used to slide in the inclined groove 34 by a preset length and connect the boring insert 40 and the tool holder 30 through the connecting member 60, so as to adjust the radial feed amount of the boring insert 40.

[0080] In use, when the radial feed amount of the boring blade 40 needs to be adjusted, the connecting member 60 is first disassembled, and then the boring blade 40 is slid in the inclined groove 34 by a preset length, which can be understood as being set according to actual needs and is not specifically limited here. Then the connecting member 60 is passed through the waist hole 42 and the inclined groove 34 and abuts against the groove bottom of the inclined groove 34 of the tool holder 30, thereby connecting the boring blade 40 and the tool holder 30.

[0081] In the present embodiment, the connecting member 60 is a bolt. It can be understood that in other embodiments, the connecting member 60 can also be other structures, as long as it can pass through the waist hole 42 and the inclined groove 34 and abut against the tool holder 30, and connect the boring blade 40 and the tool holder 30.

[0082] In some embodiments, a protruding portion 36 protrudes on the inclined groove 34, the protruding portion 36 is a cylindrical structure, the protruding portion 36 is provided in the waist hole 42, and the connecting member 60 passes through the waist hole 42 and is connected to the protruding portion 36. In this way, the sliding of the boring blade 40 in the inclined groove 34 of the tool holder 30 can be guided by the protruding portion 36, and the connecting member 60 can be connected.

[0083] In the present embodiment, the protruding portion 36 and the tool holder 30 are an integrally formed structure obtained by stamping or casting. It can be understood that in other embodiments, the protruding portion 36 and the tool holder 30 are first obtained as a separate structure by stamping or casting, and then the protruding portion 36 and the tool holder 30 are fixedly connected together by welding.

[0084] Please continue to see Figure 1 In some embodiments, the outer periphery of the tool shank 10 protrudes a abutting portion 70, the abutting portion 70 is an annular structure, the diameter of the abutting portion 70 is greater than the diameter of the tool shank 10, the outer periphery of the abutting portion 70 is spaced apart a plurality of scale lines 72, one side of the tool holder 30 abuts against the abutting portion 70, the side of the tool holder 30 close to the abutting portion 70 is provided with a reference line 38, and the abutting portion 70 is used for rotating relative to the tool holder 30 to make the abutting portion 70 rotate the preset scale line 72 relative to the reference line 38 of the tool holder 30, so as to represent the radial feed amount of the boring blade 40.

[0085] In the present embodiment, since the axis L2 of the eccentric portion 20 deviates from the axis L1 of the tool shank 10, by rotating the tool holder 30 relative to the abutting portion 70, the abutting portion 70 can be rotated by the preset scale line 72 relative to the reference line 38 of the tool holder 30, thereby accurately representing the radial feed amount of the boring blade 40.

[0086] In the present embodiment, the range of the plurality of scale lines 72 on the outer periphery of the abutting portion 70 is 0-360, and is equally spaced, and the included angle corresponding to the two adjacent scale lines 72 is 5 degrees.

[0087] In this embodiment, the boring bar 40 has multiple marking lines 44 on the side near the tool holder 30. The boring bar 40 slides within the inclined groove 34, allowing it to slide relative to the reference line 38 of the tool holder 30 along the preset marking lines 44, thus characterizing the radial feed rate of the boring bar 40. In this way, by sliding the boring bar 40 within the inclined groove 34, the boring bar 40 can slide relative to the reference line 38 of the tool holder 30 along the preset marking lines 44, thereby accurately characterizing the radial feed rate of the boring bar 40.

[0088] In some embodiments, a flattened portion 39 is provided on each side of the tool holder 30. The two flattened portions 39 are arranged in parallel and located on both sides of the inclined groove 34. The tip of the boring bar 40 extends radially out of one of the flattened portions 39 of the tool holder 30 to machine the workpiece. In this embodiment, the flattened portion 39 is a plane on the tool holder 30.

[0089] Please see below. Figure 4 , Figure 4 yes Figure 1 This diagram shows the boring tool 100 after fine-tuning, rotating from position B to position A. The tip of the boring insert 40, after fine-tuning, rotates from... Figure 4 When the first position B is rotated to the second position A, the line connecting the tip A of the boring bar 40, the center O1 of the tool holder 10, and the center O2 of the eccentric part 20 can form a triangle AO1O2. According to the law of cosines, for any triangle, the square of any side is equal to the sum of the squares of the other two sides minus twice the product of the two sides and the cosine of the angle between them. Therefore, the radial feed rate of the boring bar 40 at this time satisfies the following relationship:

[0090] (AO1) 2 =(O1O2) 2 +(AO2) 2 -2*(O1O2)*(AO2)*cosα;

[0091] Since AO1 = L2, O1O2 = H, and AO2 = L3;

[0092] Therefore, we can obtain: (L2) 2 =(H) 2 +(L3) 2 -2*H*(L3)*cosα;

[0093] Since L2 = r + X, L3 = r + H;

[0094] Therefore, we can conclude that:

[0095] (r+X) 2 =H 2 +(r+H) 2 -2*H*(r+H)*cosα;

[0096] Where r is the distance between the tip of the boring bar 40 and the center O1 of the tool holder 10 when the boring bar 40 is in the first position B; X is the radial feed amount of the boring bar 40 when it rotates from the first position B to the second position A; H is the distance between the center O1 of the tool holder 10 and the center O2 of the eccentric part 20, i.e., the eccentricity value; α is the rotation angle of the tool holder 10 when the boring bar 40 rotates from the first position B to the second position A.

[0097] Since the eccentricity H and the distance r between the tip of the boring bar 40 and the center O1 of the tool holder 10 when the boring bar 40 is in the first position B are both known values, it can be seen from the above-mentioned relationship that the radial feed of the boring bar 40 can be calculated by adjusting the angle α. For example, when the eccentricity H is 0.05mm and the diameter of the boring tool 100 is Φ14mm, the radial feed of the boring bar 40 is approximately 1μm when the tool holder 30 rotates one scale line 72 relative to the supporting part 70, and α is 5 degrees.

[0098] In this embodiment, in order to obtain a high surface quality, the feed rate per revolution of the boring tool 100 is small, for example, 0.02 mm / r, so as to control the flow direction of machining chips and avoid damaging the quality of the bored surface hole.

[0099] Please see Figure 5 , Figure 5 yes Figure 1 This diagram illustrates the axial rake angle β and clearance angle θ of the boring insert 40 in the boring tool 100. In some embodiments, the axial rake angle β of the boring insert 40 ranges from 6 degrees to 10 degrees. This ensures a sharp cutting edge for the boring insert 40, facilitates smoother chip removal, maintains high strength of the cutting edge, provides good cutting performance, and does not affect chip formation or the direction of axial force. However, when the axial rake angle β of the boring insert 40 is less than 6 degrees, the cutting edge of the boring insert 40 in the boring tool 100 is not sharp enough, chip removal is not smooth enough, and the strength is relatively low. When the axial rake angle β of the boring insert 40 is greater than 10 degrees, although the cutting edge of the boring insert 40 in the boring tool 100 has high strength, the cutting edge of the boring insert 40 is not sharp enough, and chip removal is not smooth enough.

[0100] In some embodiments, the relief angle θ of the boring blade 40 ranges from 5 degrees to 9 degrees. In this way, the strength of the boring blade 40 is ensured, the friction between the boring blade 40 and the machining surface of the workpiece is reduced, and the service life of the boring blade 40 is improved. However, when the relief angle θ of the boring blade 40 is less than 5 degrees, the strength of the boring blade 40 of the boring tool 100 is weak, the cutting edge of the boring blade 40 is easy to be damaged, and the service life is low; when the relief angle θ of the boring blade 40 is greater than 9 degrees, the cutting edge of the boring blade 40 of the boring tool 100 has greater strength, but the cutting edge of the boring blade 40 has greater friction with the machining surface of the workpiece, and the service life is low.

[0101] Referring to Figure 6 , Figure 6 is Figure 1 a schematic diagram of the radial rake angle γ of the boring blade 40 in the boring tool 100 shown in FIG. 1. In some embodiments, the radial rake angle γ of the boring blade 40 ranges from 5 degrees to 10 degrees. In this way, the cutting edge of the boring blade 40 is sharp while ensuring smooth chip removal, and the cutting edge of the boring blade 40 has high strength, good cutting performance, and does not affect the cutting efficiency. However, when the radial rake angle γ of the boring blade 40 is less than 5 degrees, the cutting edge of the boring blade 40 of the boring tool 100 is not sharp enough, chip removal is not smooth enough, and the strength is small; when the radial rake angle γ of the boring blade 40 is greater than 10 degrees, the cutting edge of the boring blade 40 of the boring tool 100 has greater strength, but the cutting edge of the boring blade 40 is not sharp enough, and chip removal is not smooth enough.

[0102] Referring to Figure 7 , Figure 7 is a flowchart of the adjustment method of the boring tool 100, including the following steps:

[0103] S210, placing the boring tool 100 in the pre-adjustment jig 200 for positioning;

[0104] Referring to Figure 8 and Figure 9 , Figure 8 is an exploded structural schematic diagram of the boring tool 100 and the pre-adjustment jig 200 according to an embodiment of the present application. Figure 9 is Figure 8 Figure 8Assembly structure schematic diagram of the middle boring tool 100 and the pre-adjusting jig 200. The pre-adjusting jig 200 is a block structure. The pre-adjusting jig 200 comprises adjacent first surface 210 and second surface 220, the first surface 210 is provided with a containing groove 230 for containing the tool shank 10, a limiting groove 240 for limiting the abutting part 70 and a pre-adjusting groove 250, the second surface 220 is provided with a directional limiting groove 260 for limiting the tool holder 30, the limiting groove 240 is communicated with the containing groove 230 to limit the movement of the abutting part 70 along the axis of the tool shank 10; the directional limiting groove 260 is communicated with the limiting groove 240, the tool holder 30 is arranged in the directional limiting groove 260, and the two flat parts 39 of the tool holder 30 abut the two groove walls of the directional limiting groove 260 respectively, the directional limiting groove 260 is used for limiting the rotation of the tool holder 30; the pre-adjusting groove 250 is communicated with the directional limiting groove 260 and the limiting groove 240, the boring blade 40 is located in the pre-adjusting groove 250, and the space of the pre-adjusting groove 250 is greater than the size of the boring blade 40, so as to facilitate the adjustment of the radial feed amount of the boring blade 40, that is, the boring blade 40 can move in the pre-adjusting groove 250. In this embodiment, the containing groove 230 is a V-shaped groove.

[0105] S220, measure the distance between the rotation center of the tool shank 10 and the tool tip of the boring blade 40 to obtain the first rotation radius of the boring tool 100;

[0106] Wherein, the distance between the rotation center of the tool shank 10 and the tool tip of the boring blade 40 is measured by scanning the eccentric part 20 and the end of the tool holder 30 using a digital profile measurement projector to obtain a profile image, and then measuring the distance according to the profile image.

[0107] S230, adjust the radial feed amount of the boring blade 40 according to the first rotation radius to obtain a second rotation radius, wherein the second rotation radius is smaller than the radius of the standard hole machined on the workpiece;

[0108] Wherein, when adjusting the radial feed amount of the boring blade 40, the connecting piece 60 is first disassembled, then the boring blade 40 is slid in the inclined groove 34 by a preset length, so that the second rotation radius is smaller than the radius of the standard hole machined on the workpiece, so that the radius of the hole machined by the boring tool 100 on the workpiece is smaller than the radius of the standard hole, and then the connecting piece 60 passes through the waist hole 42 and the inclined groove 34 and abuts against the tool holder 30, thereby connecting the boring blade 40 and the tool holder 30.

[0109] S240, make the adjusted boring tool 100 machine a hole on the workpiece;

[0110] Wherein, since the second rotation radius is smaller than the radius of the standard hole machined on the workpiece, the radius of the machined hole is smaller than the radius of the standard hole.

[0111] Wherein, the process is a trial cut, the purpose is to prevent the boring tool 100 from overcutting the hole on the workpiece, causing the workpiece to be scrapped and unable to be used, and after the trial cut, the radial feed amount of the boring blade 40 is adjusted, on the one hand, the adjustment value of the radial feed amount of the boring blade 40 is small, the adjustment level is microns, which is convenient to adjust, and on the other hand, after the adjustment, the boring tool 100 can also be used for reprocessing the workpiece, which not only saves time and effort, but also has high precision of the hole processed on the workpiece.

[0112] S250, adjusting the radial feed amount of the boring blade 40 according to the radius of the processed hole on the workpiece to obtain a third rotation radius, wherein the third rotation radius is equal to the radius of the processed standard hole on the workpiece.

[0113] Wherein, the difference between the radius of the processed hole on the workpiece and the radius of the processed standard hole on the workpiece can determine the radial feed amount of the boring blade 40 that needs to be adjusted, and when adjusting, the reference line 38 of the tool holder 30 is rotated relative to the abutting portion 70 by the predetermined scale line 72 according to the determined radial feed amount of the boring blade 40 that needs to be adjusted, so that the third rotation radius is equal to the radius of the processed standard hole on the workpiece. In this way, the boring blade 40 can process a hole with the required size on the workpiece, and the precision of the hole is high.

[0114] The above adjustment method first positions the boring tool 100 by the pre-adjustment tool 200, and then pre-adjusts the boring blade 40 of the boring tool 100, so that the second rotation radius of the boring tool 100 is smaller than the radius of the processed standard hole on the workpiece; then the boring tool 100 is used for trial processing of the workpiece, and the radial feed amount of the boring blade 40 of the boring tool 100 is fine-adjusted, so that the third rotation radius of the boring tool 100 is equal to the radius of the processed standard hole on the workpiece, the adjustment precision is high, and the machining precision of the hole on the workpiece is high.

[0115] The boring tool 100 of the present application has a small structure, a simple accessory structure, and a low production cost, which can reduce the production investment cost; and because the boring tool 100 has a small structure, it has high feasibility for use on a carving and milling machine, extends the functional range of the machine, and improves the machining efficiency and quality of the machine.

[0116] It is apparent for a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned. Furthermore, it is expressly intended that the words "comprise", "comprising", "include", "including", and "comprising" should not be construed as limiting but as meaning "including but not limited to".

[0117] It should be noted that the above embodiments are merely used to illustrate, but not limit the technical scheme of the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical scheme of the present application.

Claims

1. A boring tool, characterized in that, include: Handle; An eccentric part is fixedly connected to one end of the tool holder, and the axis of the eccentric part is offset from the axis of the tool holder; A tool holder is fitted onto the eccentric portion and can rotate relative to the eccentric portion; A boring bar is disposed in the tool holder, and one end of the boring bar extends radially out of the tool holder. The tool holder is used to drive the boring bar to rotate relative to the eccentric part in order to adjust the radial feed rate of the boring bar. The tool holder has a slanted groove on one side, and the boring insert is slidably disposed in the slanted groove. The boring insert has a waist hole. The boring tool also includes a connector, which passes through the waist hole and the slanted groove and abuts against the tool holder. The boring insert is used to slide a preset length in the slanted groove and is connected to the tool holder through the connector to adjust the radial feed rate of the boring insert. The tool holder has a supporting portion on its outer periphery. The boring tool is positioned by a pre-adjustment fixture, and then the boring insert of the boring tool is pre-adjusted. The pre-adjustment fixture is a block structure, and includes an adjacent first surface and a second surface. The first surface has a receiving groove for accommodating the tool holder, a limiting groove for limiting the supporting portion, and a pre-adjustment groove. The second surface has an orientation limiting groove for limiting the tool holder. The limiting groove communicates with the receiving groove to limit the movement of the supporting portion along the axis of the tool holder. The orientation limiting groove communicates with the limiting groove. The tool holder is disposed in the orientation limiting groove, and the orientation limiting groove is used to limit the rotation of the tool holder. The pre-adjustment groove communicates with the orientation limiting groove and the limiting groove. The boring insert is located in the pre-adjustment groove, and the space of the pre-adjustment groove is larger than the size of the boring insert.

2. The boring tool as described in claim 1, characterized in that, The outer periphery of the eccentric portion is provided with a stop groove, and the tool holder is provided with a connecting hole corresponding to the position of the stop groove. The boring tool also includes a locking member, which passes through the connecting hole and the stop groove and abuts against the eccentric portion to lock the tool holder and the eccentric portion.

3. The boring tool as described in claim 1, characterized in that, The inclined groove has a protruding part, which is located inside the waist hole. The connector passes through the waist hole and is connected to the protruding part.

4. The boring tool as described in claim 1, characterized in that, The outer periphery of the supporting part is provided with a plurality of scale lines at intervals. One side of the tool holder abuts against the supporting part. The side of the tool holder near the supporting part is provided with a reference line. The supporting part is used to rotate relative to the tool holder so that the supporting part rotates relative to the reference line of the tool holder to preset the scale line, so as to characterize the radial feed amount of the boring tool.

5. The boring tool as described in claim 4, characterized in that, The boring bar has multiple marking lines on the side near the tool holder. The boring bar is used to slide in the inclined groove so that the boring bar slides relative to the reference line of the tool holder to preset the marking lines, thereby characterizing the radial feed amount of the boring bar.

6. The boring tool as described in claim 1, characterized in that, The radial feed rate of the boring bar satisfies the following relationship: (r+X) 2 =H 2 +(r+H) 2 -2×H×(r+H)×cosα; Where r is the distance between the tip of the boring bar and the center of the tool holder when the boring bar is in the first position, X is the radial feed amount of the boring bar when the boring bar rotates from the first position to the second position, H is the distance between the center of the eccentric part and the center of the tool holder, and α is the rotation angle of the tool holder when the boring bar rotates from the first position to the second position.

7. The boring tool as described in claim 1, characterized in that, The axial rake angle of the boring bar ranges from 6 degrees to 10 degrees.

8. The boring tool as described in claim 1, characterized in that, The radial rake angle of the boring tool ranges from 5 degrees to 10 degrees.

9. The boring tool as described in claim 1, characterized in that, The back angle of the boring bar ranges from 5 degrees to 9 degrees.

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