Boring cutter

Abstract

A connecting hole and a damping hole which are sequentially communicated are formed in one end of the boring rod, one end of the boring head is connected into the connecting hole, the damping assembly is arranged in the damping hole, the damping assembly comprises a weight increasing module and two elastic pieces which abut against the two sides of the weight increasing module respectively, one elastic piece abuts against the boring head, and the other elastic piece abuts against the other end of the boring rod. The weight of the weight increasing module is larger than that of the hole forming part, and the hole forming part is the part removed from the boring rod and used for forming the damping hole. According to the boring cutter, the vibration of the boring head and the boring rod is counteracted through the combined action of the weight increasing module and the elastic piece, the resonance among the boring head, the boring rod and the metal workpiece is eliminated, the vibration generated by the boring cutter in the boring process is reduced, and the machining quality and the machining efficiency of boring are improved. The weight of the weight increasing module is larger than that of the hole forming part, so that the weight of the boring rod is increased, vibration transmitted to the boring rod by the boring head is weakened through weight increasing of the boring rod, and stable boring of a boring cutter is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of cutting tools, and in particular to a boring tool. Background Art

[0002] In the field of metal processing, the processing of slender rods, deep holes, and thin-walled parts usually uses long cantilever tool bars for metal machining such as boring and milling. In deep hole processing, boring cutters with large long diameters are generally used for processing, but the weak rigidity and low natural frequency of boring cutters are prone to cause processing vibration, which seriously affects the processing quality and efficiency of boring. Utility Model Content

[0003] In view of the above, it is necessary to propose a boring tool to reduce the vibration of the boring tool during boring and improve the processing quality and processing efficiency of the boring tool during boring.

[0004] The embodiment of the present application provides a boring tool, including a boring bar and a boring head, wherein a connecting hole and a shock-absorbing hole are formed at one end of the boring bar and are connected in sequence from the end surface of the boring bar inward, the connecting hole and the shock-absorbing hole both extend along the axial direction of the boring tool, one end of the boring head is connected to the connecting hole, the boring tool also includes a shock-absorbing assembly, the shock-absorbing assembly is arranged in the shock-absorbing hole, the shock-absorbing assembly includes a weight-gaining module and two elastic members respectively abutting on both sides of the weight-gaining module, wherein one end of the elastic member facing away from the weight-gaining module abuts on the boring head, and the other end of the elastic member facing away from the weight-gaining module abuts on the boring bar, the weight of the weight-gaining module is greater than the weight of a hole-forming part, the hole-forming part is a part removed from the boring bar for forming the shock-absorbing hole, and the diameter of the elastic member and the diameter of the weight-gaining module are both smaller than the diameter of the shock-absorbing hole.

[0005] In some embodiments, the weight-increasing module includes a plurality of weight-increasing parts and a plurality of buffer parts, wherein the plurality of weight-increasing parts are spaced apart along the axial direction of the boring tool, and two of the weight-increasing parts on the outer sides of the plurality of weight-increasing parts are respectively abutted against two of the elastic parts, and the buffer part is arranged between any two adjacent weight-increasing parts and respectively abuts against the corresponding buffer parts.

[0006] In some embodiments, diameters of the plurality of weight-increasing pieces decrease uniformly from a side close to the boring head to a side far from the boring head, and diameters of two of the plurality of weight-increasing pieces on two outer sides are equal.

[0007] In some embodiments, the boring tool satisfies the following condition:

[0008] D1=(0.8~0.95)*D2, L1=(1 / 12~1 / 10)*L2, a=(0.02~0.03)*D2;

[0009] Among them, D1 is the diameter of the weight-increasing piece, D2 is the diameter of the shock-absorbing hole, L1 is the thickness of the weight-increasing piece along the axial direction of the boring tool, L2 is the length of the shock-absorbing hole along the axial direction of the boring tool, and a is the tolerance number of the equal reduction in diameter of the several weight-increasing pieces.

[0010] In some embodiments, the boring tool satisfies the following condition:

[0011] D3=(0.95~0.98)*D2, L3=(1 / 12~1 / 10)*L1, D4=(0.7~0.85)*D3;

[0012] Among them, D3 is the diameter of the buffer, D2 is the diameter of the shock-absorbing hole, L3 is the thickness of the buffer along the axial direction of the boring tool, L1 is the thickness of the weight-increasing part along the axial direction of the boring tool, and D4 is the inner diameter of the buffer.

[0013] In some embodiments, the boring tool satisfies the following condition:

[0014] L4=L5*(0.5~0.6)*Kr*1 / K;

[0015] Among them, L4 is the axial length of the elastic member when it is installed in the shock-absorbing hole and abuts against the boring head along the boring tool, L5 is the extended length of the boring bar, Kr is the cutting performance parameter of the processed material, and K is the elastic coefficient of the elastic member.

[0016] In some embodiments, the boring tool satisfies the following condition:

[0017] d=(0.05~0.15)*D2, D5=(0.8~0.9)*D2, D6=(0.9~0.95)*D2;

[0018] Wherein, d is the wire diameter of the elastic member, D5 is the median diameter of the elastic member, D2 is the diameter of the shock absorbing hole, D6 is the outer diameter of the elastic member, and the elastic coefficient K of the elastic member is in the range of 0.85 to 0.95.

[0019] In some embodiments, the boring tool satisfies the following condition:

[0020] D2=D7*(0.5~0.6)*Kr*∫, ∫=D7 / L6*Kd, L2=(0.15~0.25)*L6;

[0021] Among them, D2 is the diameter of the shock-absorbing hole, D7 is the cutting diameter of the boring tool, Kr is the cutting performance parameter of the material being processed, L6 is the effective processing length of the boring tool, Kd is the strength coefficient of the material of the boring bar, and L2 is the axial length of the shock-absorbing hole along the boring tool.

[0022] In some embodiments, the boring tool satisfies the following condition:

[0023] D8 = (0.8-0.9) * D7;

[0024] D8 is the diameter of the boring bar, and D7 is the cutting diameter of the boring tool.

[0025] In some embodiments, the boring head includes a threaded portion, a connecting portion, a mounting portion, and a blade detachably disposed on the mounting portion, which are connected in sequence. The threaded portion is threadedly connected in the connecting hole and abuts against an end of the elastic member facing away from the weight-increasing module. The connecting portion is located in the connecting hole, and one end of the mounting portion connected to the connecting portion abuts against the end face of the boring bar.

[0026] The above-mentioned boring tool is provided with a connecting hole and a shock-absorbing hole at one end of the boring rod, one end of the boring head is connected to the connecting hole, and two elastic parts and a weight-increasing module are arranged in the shock-absorbing hole. When the boring tool is processing a metal workpiece, such as processing a deep and long hole, the boring head and the boring rod will vibrate during the processing, and the vibration force is transmitted to the two elastic parts of the shock-absorbing assembly, and the two elastic parts then transmit the vibration force to the weight-increasing module. When the weight-increasing module is subjected to the vibration force transmitted by the two elastic parts, it will reciprocate between the two elastic parts in the shock-absorbing hole along the axial direction of the boring tool. The weight-increasing module and the elastic parts work together to offset the vibration of the boring head and the boring rod, eliminate the resonance between the boring head, the boring rod and the metal workpiece, thereby reducing the vibration generated by the boring tool during the boring process and improving the boring processing quality and processing efficiency. In addition, by making the weight of the weight-increasing module greater than the weight of the hole-forming part, the weight of the boring bar will be increased after the weight-increasing module is set on the boring bar. The boring bar is weighted to reduce the vibration transmitted from the boring head to the boring bar, which helps to make the boring tool stable in boring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the boring tool provided in the embodiment of the present application.

[0028] Figure 2 yes Figure 1 Schematic diagram of the exploded view of the boring tool shown.

[0029] Figure 3 yes Figure 1 The cross-sectional view of the boring tool along III-III is shown.

[0030] Main component symbols

[0031] Boring tool 100

[0032] Boring bar 10

[0033] Connection hole 11

[0034] Shock-absorbing hole 12

[0035] End face 13

[0036] Boring head 20

[0037] Threaded portion 21

[0038] Connecting part 22

[0039] Mounting section 23

[0040] Mounting slot 231

[0041] Mounting hole 232

[0042] Blade 24

[0043] Fastening screw 25

[0044] Shock absorber assembly 30

[0045] Weight gain module 31

[0046] Weight gain piece 311

[0047] Buffer 312

[0048] Elastic member 32

[0049] Chuck 40

[0050] Axial 200 DETAILED DESCRIPTION

[0051] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0052] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0055] Please refer to Figure 1 , Figure 2 and Figure 3 The embodiment of the present application provides a boring tool 100. The boring tool 100 is used for deep and long hole processing of a metal workpiece (not shown). The boring tool 100 includes a boring bar 10, a boring head 20, a shock absorbing assembly 30, and a chuck 40. The boring tool 100 has an axial direction 200. One end of the boring head 20 is connected to the inside of one end of the boring bar 10. The shock absorbing assembly 30 is movably arranged inside the boring bar 10 and abuts against one end of the boring head 20. The chuck 40 is connected to the other end of the boring bar 10.

[0056] The boring bar 10 is cylindrical, and one end of the boring bar 10 close to the boring head 20 is provided with a connecting hole 11 and a damping hole 12 extending from the end face 13 of the boring bar 10 along the axial direction 200 of the boring cutter 100 to the chuck 40 and connected in sequence. The connecting hole 11 and the damping hole 12 both extend along the axial direction 200 of the boring cutter 100, wherein at least part of the connecting hole 11 is an internal threaded hole. Among them, one end of the boring head 20 is connected to the connecting hole 11, and the damping assembly 30 is accommodated in the damping hole 12. The material of the boring bar 10 can be 42CrMo, and the hardness of the boring bar 10 can be HRC50-55. By limiting the material and hardness of the boring bar 10, the dynamic stiffness and toughness of the boring bar 10 are large, the natural oscillation frequency of the boring bar 10 is increased, and the boring bar 10 is not easy to resonate.

[0057] The boring head 20 includes a threaded portion 21 threadedly connected to the connecting hole 11 and abutting against the shock absorbing assembly 30, a connecting portion 22 connected to one end of the threaded portion 21 away from the shock absorbing assembly 30 and located in the connecting hole 11, a mounting portion 23 connected to one end of the connecting portion 22 away from the threaded portion 21 and abutting against the end face 13 of the boring bar 10 close to the boring head 20, and a blade 24 detachably arranged on the mounting portion 23, and the blade 24 is used for boring metal workpieces. Specifically, the mounting portion 23 is provided with a mounting groove 231 and a mounting hole 232 provided at the bottom of the mounting groove 231, and the boring head 20 also includes a fastening screw 25. When clamping the blade 24, the blade 24 is placed in the mounting groove 231, and the fastening screw 25 passes through the blade 24 and is threadedly connected to the mounting hole 232, so as to achieve the clamping of the blade 24. When disassembling the blade 24, the blade 24 can be disassembled by unscrewing the fastening screw 25. The threaded portion 21, the connecting portion 22 and the mounting portion 23 are integrally formed. The material of the threaded portion 21, the connecting portion 22 and the mounting portion 23 may be 4Cr13. The hardness of the threaded portion 21, the connecting portion 22 and the mounting portion 23 may be HRC45-48. By limiting the material and hardness of the threaded portion 21, the connecting portion 22 and the mounting portion 23, the rigidity and weight of the boring head 20 are increased.

[0058] The shock absorbing assembly 30 includes a weight-increasing module 31 and two elastic members 32 respectively abutting on both sides of the weight-increasing module 31 along the axial direction 200. The two elastic members 32 are springs, one of which is abutted between one end of the weight-increasing module 31 and the threaded portion 21, and the other elastic member 32 is abutted between the other end of the weight-increasing module 31 and the inner side of the boring bar 10. The weight of the weight-increasing module 31 is greater than the weight of the hole-forming portion. The hole-forming portion is the portion removed from the boring bar 10 for forming the shock absorbing hole 12. By limiting the weight of the weight-increasing module 31 to be greater than the weight of the hole-forming portion, the weight of the boring bar 10 is increased and the strength of the boring bar 10 is enhanced. The diameter of the elastic member 32 and the diameter of the weight-increasing module 31 are both smaller than the diameter of the shock absorbing hole 12, so that the elastic member 32 and the weight-increasing module 31 can move in the shock absorbing hole 12 along the axial direction 200 of the boring tool 100.

[0059] The chuck 40 is used to clamp the end of the boring bar 10 away from the boring head 20 and is used to connect with an external spindle (not shown). It can be understood that the chuck 40 can also be a part of the external spindle.

[0060] When the above-mentioned boring tool 100 performs deep and long hole processing on a metal workpiece, the boring head 20 and the boring bar 10 will vibrate during the processing, and the vibration force is transmitted to the two elastic members 32 of the shock-absorbing assembly 30, and the two elastic members 32 then transmit the vibration force to the weight-increasing module 31. When the weight-increasing module 31 is subjected to the vibration force transmitted by the two elastic members 32, it will reciprocate between the two elastic members 32 along the axial direction 200 of the boring tool 100 in the shock-absorbing hole 12. It should be noted that the amplitude of the reciprocating motion of the weight-increasing module 31 in the shock-absorbing hole 12 is relatively small, and the weight-increasing module 31 and the elastic member 32 work together to offset the vibration of the boring head 20 and the boring bar 10, thereby eliminating the resonance between the boring head 20, the boring bar 10 and the metal workpiece, reducing the vibration generated by the boring tool 100 during the boring process, and improving the boring processing quality and processing efficiency. In addition, by making the weight of the weight-increasing module 31 greater than the weight of the hole-forming portion, i.e., the portion on the boring bar 10 where the shock-absorbing hole 12 is formed, the weight of the boring bar 10 can be increased and the strength of the boring bar 10 can be enhanced after the weight-increasing module 31 is provided on the boring bar 10. The boring bar 10 is weighted to reduce the vibration transmitted to the boring bar 10 by the boring head 20, which helps to enable the boring tool 100 to perform stable boring.

[0061] In this embodiment, the weight-increasing module 31 includes a plurality of weight-increasing pieces 311 and a plurality of buffer pieces 312, wherein the plurality of weight-increasing pieces 311 means one or more weight-increasing pieces 311 are spaced apart along the axial direction 200 of the boring tool 100, and the two weight-increasing pieces 311 on the two outer sides of the plurality of weight-increasing pieces 311 are respectively abutted against the two elastic pieces 32, and a buffer piece 312 is provided between any two adjacent weight-increasing pieces 311 and respectively abuts against the corresponding buffer pieces 312. It can also be understood that the plurality of weight-increasing pieces 311 and the plurality of buffer pieces 312 are stacked in sequence along the axial direction 200, a buffer piece 312 is provided between every two adjacent weight-increasing pieces 311, and a weight-increasing piece 311 is provided between every two buffer pieces 312. The two outer sides of the weight-increasing module 31 are weight-increasing pieces 311, wherein the buffer piece 312 is an elastic rubber ring, and the material of the weight-increasing piece 311 may be tungsten steel. Specifically, the number of weight-increasing pieces 311 is one more than the number of buffer pieces 312. In this embodiment, the number of weight-increasing pieces 311 is seven, and the number of buffer pieces 312 is six. In this way, by providing a weight-increasing module 31 having a plurality of weight-increasing pieces 311 and a plurality of buffer pieces 312, when the weight-increasing module 31 as a whole reciprocates under the action of two elastic pieces 32, the plurality of weight-increasing pieces 311 as independent individuals also reciprocate independently under the action of the corresponding buffer pieces 312, thereby offsetting the vibration force on the boring head 20 and the boring bar 10, which is more conducive to offsetting resonance, and the plurality of buffer pieces 312 also help to absorb and offset the vibration force.

[0062] In this embodiment, the diameters of the two outer weight-increasing pieces 311 among the plurality of weight-increasing pieces 311 are equal, and the diameters of the plurality of weight-increasing pieces 311 decrease arithmetic-gradiently from top to bottom along the axial direction 200. In this way, by making the masses of the plurality of weight-increasing pieces 311 different, the natural oscillation frequencies of the plurality of weight-increasing pieces 311 are different, and resonance between the plurality of weight-increasing pieces 311 and the boring bar 10 and the boring head 20 is avoided. Air is left between the plurality of weight-increasing pieces 311, and the compressed air generates a viscous attenuation force when the plurality of weight-increasing pieces 311 reciprocate, consuming the oscillation energy, thereby reducing the vibration of the boring tool 100, and reducing the friction between the weight-increasing pieces 311 and the boring bar 10.

[0063] In this embodiment, the boring tool 100 satisfies the following conditional formula:

[0064] D1=(0.8~0.95)*D2(1),

[0065] L1=(1 / 12~1 / 10)*L2(2),

[0066] a=(0.02~0.03)*D2(3);

[0067] Among them, D1 is the diameter of the weight-increasing piece 311, D2 is the diameter of the shock-absorbing hole 12, L1 is the thickness of the weight-increasing piece 311 along the axial direction 200 of the boring tool 100, L2 is the length of the shock-absorbing hole 12 along the axial direction 200 of the boring tool 100, and a is the tolerance number of the diameter reduction of several weight-increasing pieces 311.

[0068] In this way, the boring tool 100 that satisfies the above-mentioned conditions (1), (2), and (3) makes the diameter of the weight-increasing component 311 smaller than the diameter of the shock-absorbing hole 12, and reduces the tolerances of the diameters of several weight-increasing components 311, and satisfies that the weight of several weight-increasing components 311 is greater than the weight of the material removed from the boring bar 10 for forming the shock-absorbing hole 12.

[0069] In this embodiment, the boring tool 100 also satisfies the following conditional formula:

[0070] D3=(0.95~0.98)*D2(4),

[0071] L3=(1 / 12~1 / 10)*L1(5),

[0072] D4 = (0.7-0.85) * D3 (6);

[0073] Among them, D3 is the diameter of the buffer 312 , D2 is the diameter of the shock absorbing hole 12 , L3 is the thickness of the buffer 312 along the axial direction 200 of the boring tool 100 , L1 is the thickness of the weight-increasing component 311 along the axial direction 200 of the boring tool 100 , and D4 is the inner diameter of the buffer 312 .

[0074] In this way, the boring tool 100 that satisfies the above-mentioned conditions (4), (5), and (6) makes the diameter of the buffer member 312 smaller than the diameter of the shock-absorbing hole 12 and slightly larger than the diameter of the weight-increasing member 311, thereby avoiding contact between several weight-increasing members 311. The buffer member 312 helps the weight-increasing module 31 to absorb and offset the vibration force.

[0075] In this embodiment, the boring tool 100 also satisfies the following conditional formula:

[0076] L4=L5*(0.5~0.6)*Kr*1 / K(7);

[0077] Among them, L4 is the length of the elastic member 32 along the axial direction 200 of the boring cutter 100 when it is installed in the damping hole 12 and abuts against the boring head 20, L5 is the extended length of the boring bar 10, Kr is the cutting performance parameter of the material being processed, and K is the elastic coefficient of the elastic member 32. Among them, the extended length of the boring bar 10 is the length of the boring bar 10 calculated from the chuck 40. The cutting performance of the material being processed can be understood as the processing difficulty of the material being processed. The smaller the parameter, the more difficult it is to process, and vice versa, the easier it is to process. For example, taking the processing difficulty of S5C as the benchmark and defining its cutting performance parameter as 1, the cutting performance parameter range of titanium alloy is approximately 0.01 to 0.02, and the cutting performance parameter range of nickel alloy is approximately 0.2 to 0.4.

[0078] In this way, the boring tool 100 that satisfies the above conditional formula (7) enables the elastic member 32 to absorb and transmit the vibration force on the boring head 20 and the boring rod 10 after being compressed, ensuring that the elastic member 32 has elastic force so as to be able to transmit the vibration force to the weight-increasing module 31.

[0079] In this embodiment, the boring tool 100 also satisfies the following conditional formula:

[0080] d=(0.05~0.15)*D2(8),

[0081] D5=(0.8~0.9)*D2(9),

[0082] D6 = (0.9-0.95) * D2 (10);

[0083] Wherein, d is the wire diameter of the elastic member 32, D5 is the median diameter of the elastic member 32, D2 is the diameter of the shock absorbing hole 12, D6 is the outer diameter of the elastic member 32, and the elastic coefficient K of the elastic member 32 is in the range of 0.85 to 0.95.

[0084] In this embodiment, the boring tool 100 also satisfies the following conditional formula:

[0085] D2=D7*(0.5~0.6)*Kr*∫(11),

[0086] ∫=D7 / L6*Kd(12),

[0087] L2=(0.15~0.25)*L6(13);

[0088] Wherein, D2 is the diameter of the damping hole 12, D7 is the cutting diameter of the boring tool 100, Kr is the cutting performance parameter of the material being processed, L6 is the effective processing length of the boring tool 100, Kd is the strength coefficient of the material of the boring bar 10, and L2 is the length of the damping hole 12 along the axial direction 200 of the boring tool 100. Wherein, the effective processing length of the boring tool 100 is the length calculated from the opening of the chuck 40.

[0089] In this way, the boring tool 100 that satisfies the above-mentioned conditional expressions (11), (12), and (13) can be used to obtain the length of the shock-absorbing hole 12 according to the processed material, thereby obtaining the size of the elastic part 32, as well as the number and size of the weight-increasing parts 311 and the buffer parts 312, so that the boring tool 100 can achieve the effect of eliminating resonance.

[0090] In this embodiment, the boring tool 100 also satisfies the following conditional formula:

[0091] D8 = (0.8-0.9) * D7 (14);

[0092] Wherein, D8 is the diameter of the boring bar 10 , and D7 is the cutting diameter of the boring tool 100 .

[0093] In this way, the boring tool 100 that satisfies the above conditional formula (14) reasonably matches the ratio between the diameter of the boring bar 10 and the cutting diameter of the boring tool 100, ensuring that the boring tool 100 can perform boring operations safely and effectively. It can be understood that, in general, the ratio between the diameter of the boring bar 10 and the cutting diameter of the boring tool 100 takes the maximum value, such as 0.9.

[0094] The boring tool 100 provided in the embodiment of the present application increases the weight of the boring bar 10 and enhances the strength of the boring bar 10 by arranging two elastic members 32, a plurality of weight-increasing members 311 and a plurality of buffer members 312 in the shock-absorbing hole 12. When the boring tool 100 processes a deep and long hole on a metal workpiece, the boring head 20 and the boring bar 10 will vibrate during the processing, and the vibration force is transmitted to the two elastic members 32 of the shock-absorbing assembly 30. The two elastic members 32 then transmit the vibration force to the two outer weight-increasing members 311 of the plurality of weight-increasing members 311. The two outer weight-increasing members 311 are The component 311 then transmits the vibration force to other weight-increasing components 311 through the buffer component 312. The weight-increasing components 311 are subjected to the vibration force transmitted by the two elastic components 32 and the buffer components 312 and reciprocate in the shock-absorbing hole 12. The weight-increasing components 311, the buffer components 312 and the elastic components 32 work together to offset the vibration of the boring head 20 and the boring bar 10, and eliminate the resonance between the boring head 20, the boring bar 10 and the metal workpiece, thereby reducing the vibration generated by the boring tool 100 during the boring process and improving the processing quality and processing efficiency of boring. Through verification, the boring tool 100 can increase the hole surface roughness by 50% when processing a deep long hole with a length to diameter ratio of 5, and the taper error of the deep long hole is controlled within 0.005mm.

[0095] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A boring tool, comprising a boring bar and a boring head, characterized in that: A connecting hole and a shock-absorbing hole are provided at one end of the boring bar, which are connected in sequence from the end surface of the boring bar inward, and the connecting hole and the shock-absorbing hole both extend along the axial direction of the boring tool, and one end of the boring head is connected to the connecting hole. The boring tool also includes a shock-absorbing assembly, which is arranged in the shock-absorbing hole. The shock-absorbing assembly includes a weight-gaining module and two elastic members respectively abutting on both sides of the weight-gaining module, wherein one end of the elastic member facing away from the weight-gaining module abuts on the boring head, and the other end of the elastic member facing away from the weight-gaining module abuts on the boring bar, the weight of the weight-gaining module is greater than the weight of a hole-forming part, and the hole-forming part is a part removed from the boring bar for forming the shock-absorbing hole, and the diameter of the elastic member and the diameter of the weight-gaining module are both smaller than the diameter of the shock-absorbing hole.

2. The boring tool according to claim 1, characterized in that The weight-increasing module includes a plurality of weight-increasing parts and a plurality of buffer parts. The plurality of weight-increasing parts are arranged at intervals along the axial direction of the boring tool, and two of the plurality of weight-increasing parts on the two outer sides are respectively abutted against the two elastic parts. The buffer part is arranged between any two adjacent weight-increasing parts and is respectively abutted against the corresponding buffer parts.

3. The boring tool according to claim 2, characterized in that The diameters of the plurality of weight-increasing pieces decrease equidistantly from a side close to the boring head to a side far from the boring head, and the diameters of two of the plurality of weight-increasing pieces on two outer sides are equal.

4. The boring tool according to claim 3, characterized in that The boring tool satisfies the following conditional formula: D1=(0.8~0.95)*D2, L1=(1 / 12~1 / 10)*L2, a=(0.02~0.03)*D2; Among them, D1 is the diameter of the weight-increasing piece, D2 is the diameter of the shock-absorbing hole, L1 is the thickness of the weight-increasing piece along the axial direction of the boring tool, L2 is the length of the shock-absorbing hole along the axial direction of the boring tool, and a is the tolerance number of the equal reduction in diameter of the several weight-increasing pieces.

5. The boring tool according to claim 2, characterized in that The boring tool satisfies the following conditional formula: D3=(0.95~0.98)*D2, L3=(1 / 12~1 / 10)*L1, D4=(0.7~0.85)*D3; Among them, D3 is the diameter of the buffer, D2 is the diameter of the shock-absorbing hole, L3 is the thickness of the buffer along the axial direction of the boring tool, L1 is the thickness of the weight-increasing part along the axial direction of the boring tool, and D4 is the inner diameter of the buffer.

6. The boring tool according to claim 1, characterized in that The boring tool satisfies the following conditional formula: L4=L5*(0.5~0.6)*Kr*1 / K; Among them, L4 is the axial length of the elastic member when it is installed in the shock-absorbing hole and abuts against the boring head along the boring tool, L5 is the extended length of the boring bar, Kr is the cutting performance parameter of the processed material, and K is the elastic coefficient of the elastic member.

7. The boring tool according to claim 1, characterized in that The boring tool satisfies the following conditional formula: d=(0.05~0.15)*D2, D5=(0.8~0.9)*D2, D6=(0.9~0.95)*D2; Wherein, d is the wire diameter of the elastic member, D5 is the median diameter of the elastic member, D2 is the diameter of the shock absorbing hole, D6 is the outer diameter of the elastic member, and the elastic coefficient K of the elastic member is in the range of 0.85 to 0.

95.

8. The boring tool according to claim 1, characterized in that The boring tool satisfies the following conditional formula: D2=D7*(0.5~0.6)*Kr*∫, ∫=D7 / L6*Kd, L2=(0.15~0.25)*L6; Among them, D2 is the diameter of the shock-absorbing hole, D7 is the cutting diameter of the boring tool, Kr is the cutting performance parameter of the material being processed, L6 is the effective processing length of the boring tool, Kd is the strength coefficient of the material of the boring bar, and L2 is the axial length of the shock-absorbing hole along the boring tool.

9. The boring tool according to claim 1, characterized in that The boring tool satisfies the following conditional formula: D8 = (0.8-0.9) * D7; D8 is the diameter of the boring bar, and D7 is the cutting diameter of the boring tool.

10. The boring tool according to claim 1, characterized in that The boring head includes a threaded portion, a connecting portion, a mounting portion, and a blade detachably arranged on the mounting portion, which are connected in sequence. The threaded portion is threadedly connected in the connecting hole and abuts against an end of the elastic member facing away from the weight-increasing module. The connecting portion is located in the connecting hole, and one end of the mounting portion connected to the connecting portion abuts against the end face of the boring bar.

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