High rigidity non-supported tooth precision chamfering cutter

Abstract

The present invention discloses a high-rigidity precision chamfering tool without supporting teeth, comprising a tool body, an axial hole is opened in the center of the tool body 1, a plurality of connecting holes are arranged around the axial hole, a circle of teeth are evenly distributed on the outer periphery of the tool body, a back support is arranged at the rear half of the teeth, and the outer circle semi-cone angle of the teeth is 5°-25°. The present invention does not require supporting teeth, and the tool rigidity is increased several times by grinding with a gear grinder with an increased grinding angle, without the risk of tooth jumping; the rigidity is increased, the elastic deformation of the chamfering tool under the extrusion force is reduced, and the chamfer width can be controlled more accurately; the outer circle semi-cone angle of the teeth is smooth and the gear root is chamfered to reduce the step.

Description

Technical Field

[0001] The invention belongs to the technical field of machining, and in particular relates to a high-rigidity support-free tooth precision chamfering cutter. Background Art

[0002] The common chamfering cutter first processes the supporting gear, and then processes the left and right working surfaces on the left and right tooth surfaces of the supporting gear. Due to the existence of the supporting gear, the tool is not rigid enough, and the tooth popping phenomenon is easy to occur. Moreover, it is easy to elastically deform under force, resulting in low chamfering precision, which requires increased processing time and low efficiency. The present invention eliminates the supporting gear, effectively solves the rigidity problem, and improves the chamfering precision. Summary of the invention

[0003] The object of the present invention is to provide a high-rigidity support-free tooth precision chamfering cutter to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-rigidity support-free tooth precision chamfering knife, comprising a knife body, an axial hole (which can be made into a waist-shaped groove according to the machine tool) is opened in the center of the knife body, a plurality of connecting holes are arranged around the axial hole, a circle of teeth are evenly distributed on the outer periphery of the knife body, a back support is provided on the rear half of the teeth, the semi-cone angle of the outer edge of the teeth 4 is 5°-25°, the back support does not have symmetrical teeth, and the function of the back support is to increase the rigidity because there is no tooth groove.

[0005] Preferably, the width of the back support is 2 mm to 5 mm, which ensures the rigidity of the tool without increasing too much material cost.

[0006] Preferably, the chamfer angle of the right tooth surface of the cutter tooth is 10°-50°, and the chamfer angle of the left tooth surface of the cutter tooth is 10°-55°. This angle is controlled based on the calculation of the material extrusion amount, effectively balancing the forces of the left and right tooth surfaces, making the chamfers of the left and right tooth surfaces uniform.

[0007] Preferably, the chamfer amount a of the cutter teeth is 0.3mm-1mm, the outer reserve amount b of the cutter teeth in contact with the gear is greater than 0.5mm, and the inner reserve amount c is greater than 0.3mm. The reserve amount ensures that the working surface has sufficient chamfer width to prevent steps from occurring during processing.

[0008] Preferably, the meshing clearance between the cutter teeth and the gear is 0.3 mm to 0.5 mm. The clearance ensures that the chamfering cutter does not interfere with the gear tooth top during processing, but it may cause processing difficulties.

[0009] Technical effects and advantages of the present invention:

[0010] 1. This chamfering cutter does not need to support the teeth. The cutting tool can be ground with a larger grinding angle by a gear grinder, which increases the rigidity of the cutter several times and eliminates the risk of tooth jumping.

[0011] 2. The rigidity of this structure is enhanced, the elastic deformation of the chamfering knife under the extrusion force is reduced, and the chamfering width can be controlled more accurately;

[0012] 3. The outer edge of the cutter teeth of this tool has a semi-conical angle, and the root of the gear is chamfered to a smooth finish to prevent steps and flanging burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 is a side view of the present invention;

[0015] Figure 3 It is the expanded view of the working pitch circle of the present invention;

[0016] Figure 4 This is the meshing diagram of the chamfered end face;

[0017] Figure 5 This is the meshing diagram of the chamfered side.

[0018] Numbers in the figure: 1 cutter body, 2 shaft hole, 3 connecting hole, 4 cutter teeth, 5 back support, 41 chamfered right tooth surface, 42 chamfered left tooth surface. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 5 A specific implementation of a high-rigidity, support-free, precision chamfering knife of the present invention is shown: it comprises a knife body 1, an axial hole 2 is opened in the center of the knife body 1, a plurality of connecting holes 3 are arranged around the axial hole 2, a circle of knife teeth 4 are evenly distributed on the outer periphery of the knife body 1, a back support 5 is arranged at the rear half of the knife teeth 4, the width of the back support 5 is 2mm-5mm, and the semi-cone angle of the outer edge of the knife teeth 4 is 5°-25°; the chamfer angle of the chamfered right tooth surface 41 of the knife teeth 4 is 10°-50°, and the chamfer angle of the chamfered left tooth surface 42 of the knife teeth 4 is 10°-55°; the chamfer amount a of the knife teeth 4 is 0.3mm-1mm, the outer reserved amount b of the knife teeth 4 in contact with the gear is greater than 0.5mm, and the inner reserved amount c is greater than 0.3mm; the meshing clearance between the knife teeth 4 and the gear is 0.3mm-0.5mm.

[0021] The chamfering knife does not need to support the teeth. By increasing the grinding angle on a gear grinder, the rigidity of the tool is enhanced several times, and there is no risk of tooth popping. With the enhanced rigidity, the elastic deformation of the chamfering knife under the extrusion pressure is reduced, and the chamfer width can be controlled more accurately. Ordinary chamfering knives must increase the number of chamfering circles due to elastic deformation to achieve the chamfering height. The chamfering knife of the present application does not need to increase the number of circles to resist the error caused by the chamfering deformation, so the chamfering efficiency can be improved by more than 50%. The outer edge of the tooth of the tool has a semi-conical angle, and the root of the gear is chamfered to a smooth end to prevent steps and flange burrs.

[0022] The applicant further declares that the present invention illustrates the implementation method and device structure of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned implementation methods, that is, it does not mean that the present invention must rely on the above-mentioned methods and structures to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of the implementation method selected by the present invention, addition of steps, selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

[0023] The present invention is not limited to the above-mentioned embodiments, and all methods that use structures and methods similar to the present invention to achieve the purpose of the present invention are within the protection scope of the present invention.

Claims

1. A high-rigidity non-supported tooth precision chamfering knife, comprising a knife body (1), an axial hole (2) is opened in the center of the knife body (1), and a plurality of connecting holes (3) are arranged around the axial hole (2), characterized in that: A circle of blade teeth (4) is evenly distributed on the outer periphery of the blade body (1); a back support (5) is provided at the rear half of the blade teeth (4); the semi-cone angle of the outer edge of the blade teeth (4) is 5°-25°; the width of the back support (5) is 2mm-5mm; the chamfer angle of the chamfered right tooth surface (41) of the blade teeth (4) is 10°-50°, and the chamfer angle of the chamfered left tooth surface (42) of the blade teeth (4) is 10°-55°; the chamfer amount a of the blade teeth (4) is 0.3mm-1mm, the outer reserved amount b of the blade teeth (4) in contact with the gear is greater than 0.5mm, and the inner reserved amount c is greater than 0.3mm; the meshing clearance between the blade teeth (4) and the gear is 0.3mm-0.5mm.

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