Reamer and portable boring machine

Abstract

The utility model relates to the technical field of machining, and discloses a reamer and a portable boring machine. The reamer comprises a reamer handle section, a reamer body section and a cutting section which are sequentially arranged, the reamer handle section of the reamer can be installed on the portable boring machine, a plurality of cutting edges are annularly arranged on the cutting section in the circumferential direction, the tool cutting edge angle kr of the cutting edges ranges from 10 degrees to 12 degrees, and compared with a standard reamer, the tool cutting edge angle kr is reduced, so that the cutting edges can better conform to the shape of the surface of a workpiece, and the machining precision is improved. According to the reamer, friction and resistance between the cutting edge and a workpiece are reduced, the smaller the axial resistance borne by the cutting edge is, the more stable the cutting process is, the range of the front angle gamma of the cutting edge is 0-5 degrees, and compared with a standard reamer, the front angle gamma is increased, tensile fracture of materials is facilitated, the contact area between the cutting edge and the workpiece is reduced, and therefore the cutting resistance is reduced. By reducing the axial resistance of the reamer during machining and reducing the cutting resistance, the large-diameter reamer can be adopted in the portable boring machine.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a reamer and a portable boring machine. Background Technology

[0002] In the field of machining, especially in the machining of reamed holes on shaft flanges, portable boring machines are often used. The portable boring machine is fixed to the outer diameter of the shaft, and a boring bar or reamer is used to machine the reamed holes on the flange.

[0003] However, in practice, the application of portable boring machines faces a series of challenges when the diameter of the flange hole exceeds a certain range (e.g., φ50). The power of a typical portable boring machine is usually around 1.5kW, while even a large portable boring machine only has a power of about 2kW. This power level is particularly insufficient when dealing with flange holes of larger diameters. Especially when using a standard reamer, the load on the cutting edge increases dramatically, leading to low cutting efficiency and potentially damaging the cutting edge. Therefore, when the flange hole diameter is greater than φ50, a standard reamer cannot be effectively used on a portable boring machine. In this case, only a floating boring bar can be used for finishing the flange hole, and the hole diameter tolerance must be adjusted manually by the worker, resulting in extremely low processing efficiency and unstable dimensional consistency.

[0004] Therefore, there is an urgent need for a reamer and a portable boring machine to solve the aforementioned problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a reamer and a portable boring machine. By reducing the axial resistance of the reamer during machining and reducing the cutting resistance, it is possible to use a large-diameter reamer to ream flange holes on a portable boring machine. This greatly reduces preparation time, significantly increases machining efficiency, and improves the dimensional consistency of the reamer, thus ensuring the stability of the part machining quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On the one hand, a reamer is provided, the reamer comprising a shank section, a shank section and a cutting section arranged sequentially, the shank section being used to install in a preset position, the cutting section being provided with a plurality of cutting edges in a circumferential direction, the principal cutting edge angle kr of the cutting edge being in the range of 10°-12°; the rake angle γ of the cutting edge being in the range of 0-5°.

[0008] As a preferred technical solution for a reamer, the number of cutting edges is half that of a standard reamer.

[0009] As a preferred technical scheme of the reamer, the cutting section further comprises a finishing edge, the finishing edge is located at one end of the cutting edge close to the shank section, the finishing edge is inverted conical, and the taper of the finishing edge is 0.005 / 100.

[0010] As a preferred technical scheme of the reamer, the cutting section is provided with an inverted conical part at one end away from the shank section.

[0011] As a preferred technical scheme of the reamer, the cutting diameter of the cutting section is D1, the diameter of the shank section is D2, and D2 is less than D1.

[0012] As a preferred technical scheme of the reamer, D2 is 65%-75% of D1.

[0013] As a preferred technical scheme of the reamer, the length of the cutting section is L1, the length of the shank section is L2, the cutting depth of the reamer is L3, and L1+L2=L3+10.

[0014] As a preferred technical scheme of the reamer, the cutting edge is provided with a TiC coating, a TiN coating or an Al2O3 coating.

[0015] As a preferred technical scheme of the reamer, the shank section adopts a Morse taper shank.

[0016] In another aspect, a portable boring machine is provided, comprising the reamer of any of the above schemes.

[0017] The reamer has the following beneficial effects:

[0018] The reamer and the portable boring machine have the following beneficial effects: the reamer can be installed on the portable boring machine, the cutting edge can better conform to the shape of the workpiece surface, the friction and resistance between the cutting edge and the workpiece are reduced, the axial resistance of the cutting edge is smaller, the cutting process is more stable, the rake angle of the cutting edge is increased, the material is stretched and fractured, the cutting deformation and the cutting force are reduced, the contact area between the cutting edge and the workpiece is reduced, and thus the cutting resistance is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the contents of the embodiments of the present application and these drawings without any creative effort.

[0020] Figure 1 is a structural schematic diagram of the reamer provided by the embodiment of the present application;

[0021] Figure 2 is Figure 1 the enlarged view at A-A.

[0022] The drawings are marked as follows:

[0023] 1, the shank section;

[0024] 2, the cutter body section;

[0025] 3, the cutting section; 31, the cutting edge; 32, the finishing edge; 33, the inverted taper portion. Embodiment

[0026] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limit the present application. In addition, it should be noted that in order to facilitate the description, only the relevant part structure of the present application is shown in the drawings, rather than the whole structure.

[0027] 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 communication between 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.

[0028] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature "on", "above" and "on" of second feature include that first feature is directly above and obliquely above of second feature, or only indicate that horizontal height of first feature is higher than second feature.First feature "under", "below" and "under" of second feature include that first feature is directly below and obliquely below of second feature, or only indicate that horizontal height of first feature is less than second feature.

[0029] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, 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, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0030] In the prior art, when the diameter of the flange hole exceeds a certain range (such as φ50), the application of the portable boring machine faces a series of challenges.The power of the ordinary portable boring machine is usually about 1.5kW, and the power of the large portable boring machine is only 2kW.This power level is particularly insufficient when facing larger diameter flange holes.Especially when using ordinary standard reamers for cutting, the load of the cutting edge will increase sharply, resulting in low cutting efficiency, and even the cutting edge may be damaged.Therefore, in the case of flange hole diameter greater than φ50, ordinary standard reamers cannot be effectively applied on the portable boring machine.In this case, only the floating boring cutter can be used to finish the flange hole, and the hole diameter tolerance can only be adjusted manually by the worker, the processing efficiency is extremely low, and the size consistency is unstable.

[0031] To solve the above problems, such as Figure 1 and Figure 2As shown, the embodiment provides a portable boring machine, the portable boring machine comprising a reamer, the reamer comprising a shank section 1, a body section 2 and a cutting section 3 arranged in sequence, the shank section 1 of the reamer can be installed on the portable boring machine, the cutting section 3 is circumferentially annularly provided with a plurality of cutting edges 31, the main rake angle kr of the cutting edge 31 ranges from 10° to 12°, compared with the standard reamer, the main rake angle kr is reduced, so that the cutting edge 31 can better adapt to the shape of the workpiece surface, reducing the friction and resistance between the cutting edge 31 and the workpiece, the smaller the axial resistance of the cutting edge 31, the more stable the cutting process, the rake angle γ of the cutting edge 31 ranges from 0° to 5°, compared with the standard reamer, the rake angle γ is increased, which is beneficial to the tensile fracture of the material, reduces the cutting deformation and cutting force, reduces the contact area between the cutting edge 31 and the workpiece, thereby reducing the cutting resistance. The embodiment reduces the axial resistance of the reamer during machining and reduces the cutting resistance, making it possible to use a large-diameter reamer to ream the flange hole on the portable boring machine, which can avoid manual adjustment when using a floating boring tool, greatly reducing the preparation time, significantly increasing the processing efficiency, and the reaming size consistency is better, ensuring the stability of the part processing quality. In the embodiment, the main rake angle and the rake angle of the cutting edge 31 are both academic names, the main rake angle of the cutting edge 31 refers to the angle between the main cutting edge 31 and the assumed feed motion direction measured in the base surface, and the rake angle of the cutting edge 31 refers to the angle between the cutting edge 31 and the workpiece surface to be machined.

[0032] Preferably, the number of cutting edges 31 is half the number of cutting edges 31 of the standard reamer. For example, the number of cutting edges 31 of a φ80H7 standard reamer is 12, and the number of cutting edges 31 of the embodiment is 6, which can greatly reduce the load of the cutting edge 31, making it possible to ream the hole on the portable boring machine.

[0033] Preferably, the cutting section 3 further comprises a finishing edge 32, the finishing edge 32 is located at one end of the cutting edge 31 close to the body section 2, the finishing edge 32 is inverted conical, the taper of the finishing edge 32 is 0.005 / 100, the contact area between the finishing edge 32 and the hole wall is as small as possible to minimize the frictional resistance with the hole wall. This design not only helps to reduce the cutting temperature and reduce the accumulation of cutting heat, but also effectively avoids the reamer wear and scratching of the workpiece surface caused by friction, significantly improves the machining accuracy and prolongs the service life of the reamer.

[0034] The end of the cutting section 3 away from the body section 2 is provided with an inverted taper portion 33. The design of the inverted taper portion 33 has multiple effects of reducing frictional resistance, improving machining accuracy, enhancing guiding effect, adapting to slight deviation and improving tool durability in cutting processing.

[0035] Further, the reaming diameter of the cutting section 3 is D1, and the diameter of the tool body section 2 is D2, D2 is less than D1. In the embodiment, D2 is 65%-75% of D1, specifically, D2 is 65%, 70% or 75% of D1, compared with the standard reamer, D2 is appropriately reduced, which maximally reduces the weight of the reamer while ensuring the rigidity requirement of the reamer.

[0036] Further, the length of the cutting section 3 is L1, the length of the tool body section 2 is L2, the reaming depth of the reamer is L3, L1+L2=L3+10. The length of the cutting section 3 and the tool body section meets the reaming depth requirement, and the shorter the length of the cutting section 3 and the tool body section is, the better the rigidity of the reamer is.

[0037] In the embodiment, the reamer is a large-diameter reamer, the cutting edge 31 of the reamer uses a welded hard alloy, and the cutting edge 31 is provided with a TiC coating, a TiN coating or an Al2O3 coating, etc. to improve the wear resistance of the reamer.

[0038] In the embodiment, the tool shank section 1 adopts a Morse taper shank. The Morse taper shank has the advantages of high-precision connection, convenient disassembly and assembly, strong adaptability and large torque transmission in mechanical processing.

[0039] The reamer in the embodiment has achieved good results in production practice, and the large-diameter, low-load machine reamer used in the embodiment has been successfully used in production practice, and the processing efficiency and production quality have been greatly improved.

[0040] Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A reamer, characterized by, The reamer comprises a shank section (1), a body section (2) and a cutting section (3) arranged in sequence, the shank section (1) is used for installation at a preset position, the cutting section (3) is circumferentially provided with a plurality of cutting edges (31), the main offset angle kr of the cutting edge (31) ranges from 10° to 12°, the rake angle γ of the cutting edge (31) ranges from 0° to 5°, the main offset angle kr refers to the included angle between the cutting edge (31) and the assumed feeding direction in the base surface, and the rake angle γ refers to the included angle between the cutting edge (31) and the workpiece surface to be machined.

2. The reamer according to claim 1, wherein The number of the cutting edges (31) is half of that of a standard reamer.

3. The reamer of claim 1, wherein, The cutting section (3) further comprises a light trimming edge (32) located at one end of the cutting edge (31) close to the body section (2), the light trimming edge (32) is in the shape of an inverted cone, and the taper of the light trimming edge (32) is 0.005 / 100.

4. The reamer of claim 1, wherein, An inverted taper part (33) is arranged at one end of the cutting section (3) away from the body section (2).

5. The reamer of claim 1, wherein, The reaming diameter of the cutting section (3) is D1, the diameter of the body section (2) is D2, and D2 is less than D1.

6. The reamer according to claim 5, wherein D2 is 65%-75% of D1.

7. The reamer of claim 1, wherein, The length of the cutting section (3) is L1, the length of the body section (2) is L2, the cutting depth of the reamer is L3, and L1+L2=L3+10.

8. The reamer according to any one of claims 1-7, wherein, The cutting edge (31) is provided with a TiC coating, a TiN coating or an Al2O3 coating.

9. The reamer according to any one of claims 1-7, wherein, The shank section (1) adopts a Morse taper shank.

10. A portable boring machine characterized in that A reamer comprising any one of claims 1-9. A reamer comprising any one of claims 1-9.

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