Involute internal helical gear cutting tool suitable for different spiral angles

Abstract

The application discloses a tooth meshing cutter suitable for machining involute inner helical gear with different helix angles, wherein the tooth meshing cutter is provided with tooth along the circumference, the structure of the tooth includes a cutting edge, a relief surface and a rake surface, the cutting edge includes a left side edge, a right side edge and a top edge, wherein the left side edge and the right side edge are left and right involute profile lines on the section of a drum type external spur gear engaged with the inner helical gear part, the top edge is a circular arc in the same plane with the left side edge and the right side edge and tangent to the left side edge and the right side edge, the relief surface is formed by lofting the cutting edge and a series of relief surface construction lines, the relief surface construction lines are connected by the left and right involute profile lines on the section of the drum type external spur gear with gradually decreasing diameters and the circular arcs tangent to the left and right involute profile lines, and the rake surface is a free curved surface capable of forming a cutting rake angle and is fitted by the cutting edge and the series of relief surface construction lines. The tooth meshing cutter can be used to machine workpieces with different helix angles and greatly reduce the production cost.

Description

Technical Field

[0001] This invention relates to a cutting tool for machining involute internal helical teeth, and more particularly to a tooth-removing tool suitable for machining involute internal helical teeth with different helix angles. Background Technology

[0002] Gear cutting tools are currently a hot topic in the field of gear processing. However, gear cutting tools designed and manufactured according to the current gear cutting tool design theory can only process one type of workpiece and lack versatility, which limits the widespread application of gear cutting technology. Summary of the Invention

[0003] The purpose of this invention is to address the problem that current gear cutting tools lack versatility by providing a gear cutting tool suitable for machining involute internal helical teeth with different helix angles, thus achieving the goal of machining involute internal helical teeth with different helix angles with a single tool.

[0004] The technical solution adopted to achieve the purpose of this invention is:

[0005] A rebar cutting tool suitable for machining involute internal helical teeth with different helix angles, wherein the rebar cutting tool has cutting teeth distributed along its circumference, and each cutting tooth includes a cutting edge, a flank face, and a rake face.

[0006] The cutting edge includes a left cutting edge, a right cutting edge, and a top cutting edge, wherein:

[0007] The left and right cutting edges are the involute profiles on the left and right sides of the cross section of the drum-shaped external spur gear that meshes with the internal helical gear parts; the top cutting edge is an arc that is in the same plane as the left and right cutting edges and is tangent to the left and right cutting edges respectively.

[0008] The flank face is formed by the cutting edge and a series of flank face construction lines; the flank face construction lines are formed by connecting the involute profiles on the left and right sides of the cross section of the drum-shaped external spur gear with successively decreasing diameter and the circular arcs tangent to them.

[0009] The rake face is a free-form surface that can form a cutting rake angle, which is formed by fitting the cutting edge and a series of flank face construction lines.

[0010] In the above technical solution, the front angle is -5 to 20°.

[0011] In the above technical solution, the left and right cutting edges are constructed as follows:

[0012] Construct a drum-shaped external spur gear that meshes with the internal helical gear ring without backlash. Take the mid-section of the drum-shaped external spur gear. This mid-section intersects with the cutter teeth to form the left and right involute profiles. The two involute profiles serve as the left and right cutting edges of the cutter, respectively.

[0013] In the above technical solution, the top cutting edge is constructed by the following method:

[0014] On the plane containing the mid-section of the drum-shaped external spur gear, construct a circular arc tangent to the left and right cutting edges to form the top cutting edge.

[0015] In the above technical solution, the cutting edge is constructed by connecting the left edge, the right edge and the top edge to form the cutting edge.

[0016] In the above technical solution, the flank face is constructed by the following method:

[0017] Reduce the diameter of the drum-shaped external spur gear that meshes with the internal helical gear part, and cut the involute profiles on the left and right sides of the mid-section. Construct a circular arc tangent to the involute profiles on both sides on the same plane. Connect the involute profiles and the circular arcs to form a flank face construction line. Continue to reduce the diameter of the drum-shaped external spur gear in this way to form flank face construction lines arranged sequentially along the tool axis. Fit the cutting edge and all flank face construction lines to form the flank face.

[0018] In the above technical solution, the rake face is constructed by the following method:

[0019] The cutting edge is discretized into a set of cutting points. Based on the cutting principle, a rake face construction line that reflects the rake angle is constructed at each cutting point. The surface is constructed using all the rake face construction lines to form the rake face.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention provides an involute internal helical gear cutting tool applicable to different helix angles. By setting different axial angles between the tool and the workpiece, internal helical gear parts with different helix angles within a certain range can be processed.

[0022] 2. The cutting tool of the present invention has a rake angle on the front face, which can significantly improve cutting conditions and extend tool life. Attached Figure Description

[0023] Figure 1 The diagram shown is a structural diagram of the toothed cutter of the present invention;

[0024] Figure 2 The diagram shown is a schematic of the cutting edge composition.

[0025] Figure 3 The diagram shows the left and right blades;

[0026] Figure 4 The diagram shown is a schematic of the back face of the tool.

[0027] Figure 5 The diagram shown is a schematic of the rake face;

[0028] In the diagram: 1-cutting tooth, 2-cutting edge, 3-flank face, 4-rake face, 5-left side edge, 6-right side edge, 7-top edge, 8-flank face construction line, 9-rake angle, 10-rake face construction line, 11-base plane, 12-middle section, 13-involute profile, 14-circular arc;

[0029] A - Gear cutter, B - Drum-shaped external spur gear, C - Internal helical gear ring. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] like Figures 1-5 As shown, the present invention provides a tooth-removing tool A suitable for machining involute internal helical teeth with different helix angles, wherein a plurality of cutting teeth 1 are evenly distributed on its circumference. Each cutting tooth 1 includes a cutting edge 2, a flank face 3, and a rake face 4. Figure 2 As shown, the cutting edge 2 includes a left cutting edge 5, a right cutting edge 6, and a top cutting edge 7.

[0032] The left blade 5 and the right blade 6 can be constructed as follows:

[0033] A drum-shaped external spur gear B is constructed to mesh with the internal helical gear ring C without backlash, such as... Figure 3 As shown, take the mid-section 12 of the drum-shaped external spur gear B. The mid-section 12 intersects with the cutting tooth 1 to form the left and right involute profiles 13. The two involute profiles 13 serve as the left cutting edge 5 and the right cutting edge 6 of the cutting tool, respectively.

[0034] like Figure 2 As shown, the top cutting edge 7 can be constructed as follows:

[0035] Construct an arc tangent to the left edge 5 and the right edge 6 in the plane containing the left edge 5 and the right edge 6. This arc is the top edge 7.

[0036] like Figure 2 As shown, the cutting edge 2 can be constructed as follows:

[0037] Connecting the left edge 5, the right edge 6, and the top edge 7 together forms the cutting edge 2.

[0038] The flank face 3 is formed by lofting the cutting edge 2 and a series of flank face construction lines 8, and can be constructed as follows:

[0039] exist Figure 4 In the middle, place the cutting edge 2 in the first layer, and set the back face construction lines 8 and S. C2 S C3 S C4 SC5 ...arranged sequentially along the tool axis, the arranged curves are fitted with a surface, and the resulting surface is the back face 3.

[0040] The flank face construction line 8 can be constructed as follows:

[0041] According to the cutting edge 2 construction method, the diameter of the drum-shaped external spur gear B is reduced. The involute profiles 13 on the left and right sides of the mid-section 12 of the drum-shaped external spur gear B are taken. Arcs 14 tangent to the involute profiles 13 are constructed on the same plane of the two involute profiles 13. The two involute profiles 13 and the arcs 14 are connected to form a flank face construction line 8, such as... Figure 4 As shown.

[0042] Following the construction method of the aforementioned single rake face construction line 8, the diameter of the drum-shaped external spur gear B that meshes with the internal helical gear part is successively reduced to construct a series of rake face construction lines S. C2 S C3 S C4 S C5 ……,like Figure 4 As shown.

[0043] like Figure 5 As shown, the rake face 4 can be constructed as follows:

[0044] The cutting edge 2 is discretized into several cutting points, and a ray with a rake angle of 9 is drawn at each cutting point as the rake face construction line 10. The angle between the rake face construction line 10 and the base plane 11 is the rake angle 9. A curved surface is constructed using these rake face construction lines 10, and this curved surface is the rake face 4.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A cutting tool suitable for machining involute internal helical teeth with different helix angles, wherein the cutting tool has cutting teeth (1) distributed along its circumference, and each cutting tooth (1) includes a cutting edge (2), a flank face (3), and a rake face (4), characterized in that, The cutting edge (2) includes a left cutting edge (5), a right cutting edge (6), and a top cutting edge (7), wherein: the left cutting edge (5) and the right cutting edge (6) are the left and right involute profiles (13) on the middle section (12) of the drum-shaped external spur gear (B) that meshes with the internal helical gear part; the top cutting edge (7) is an arc that is in the same plane as the left cutting edge (5) and the right cutting edge (6) and is tangent to the left cutting edge (5) and the right cutting edge (6) respectively; the flank face (3) is formed by the cutting edge (2) and a series of flank face construction lines (8); the flank face construction lines (8) are formed by connecting the left and right involute profiles (13) on the middle section (12) of the drum-shaped external spur gear (B) with successively decreasing diameter and the arcs (14) tangent to them; the rake face (4) is a free surface with a rake angle (9) constructed with the cutting edge (2) as the boundary; The flank face (3) is constructed by the following method: reducing the diameter of the drum-shaped external spur gear (B) that meshes with the internal helical gear part, cutting the involute profiles (13) on the left and right sides of the mid-section (12), constructing a circular arc (14) on the same plane of the involute profiles (13) on both sides respectively tangent to the involute profiles (13) on both sides, and connecting the involute profiles (13) on both sides and the circular arc (14) to form a flank face construction line (8); in this way, the diameter of the drum-shaped external spur gear (B) is reduced in sequence to form flank face construction lines (8) arranged sequentially along the tool axis, and the cutting edge (2) and all flank face construction lines (8) are fitted with a curved surface to form the flank face (3); The rake face (4) is constructed by the following method: the cutting edge (2) is discretized into a set of cutting edge points, and a rake face construction line (10) that embodies the rake angle (9) is constructed at each cutting edge point according to the cutting principle. The rake face (4) is formed by constructing a curved surface using all the rake face construction lines (10). The front angle (9) is -5 to 20°; The left cutting edge (5) and the right cutting edge (6) are constructed by the following method: constructing a drum-shaped external spur gear (B) that meshes with the internal helical gear ring (C) without backlash, taking the mid-section (12) of the drum-shaped external spur gear (B), the mid-section (12) intersects with the cutting tooth (1) to form the left and right involute profiles (13), the two involute profiles (13) serve as the left cutting edge (5) and the right cutting edge (6) of the cutting tool, respectively.

2. The tooth-removing tool as described in claim 1, characterized in that, The top edge (7) is constructed by means of the following method: on the plane of the mid-section (12) of the drum-shaped external spur gear (B), a circular arc tangent to the left edge (5) and the right edge (6) is constructed to form the top edge (7).

3. The tooth-removing tool as described in claim 2, characterized in that, The cutting edge (2) is constructed by connecting the left cutting edge (5), the right cutting edge (6) and the top cutting edge (7) to form the cutting edge (2).

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