Disc-shaped milling cutter suitable for large-modulus span multi-tooth-number involute tooth profile gear

Abstract

The utility model relates to a disc-shaped milling cutter suitable for a large-modulus span multi-tooth-number involute tooth profile gear, belongs to the field of machining and manufacturing, and aims to improve the milling efficiency. Comprising a left-side-edge blade, a right-side-edge blade and a top-edge blade, a plurality of left side edge blades are combined into a group of left side cutting knives, the left side edge blades in each group of left side cutting knives are distributed in a staggered manner, and an effective cutting edge contour formed by overlapping the left side edge blades in each group is an involute contour matched with a theoretical tooth profile contour; a plurality of right side edge blades are combined into a group of right side cutting knives, the right side edge blades in each group of right side cutting knives are distributed in a staggered mode, and the contour of an effective cutting edge formed by lap joint of the right side edge blades in each group is an involute contour matched with the theoretical tooth profile contour. The machined tooth surface allowance is uniform, the step of hobbing a tooth profile with non-uniform tooth surface allowance to an involute tooth profile is reduced, machining procedures are saved, and cutting is more efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining manufacturing, and particularly relates to a disc type milling cutter for involute profile gears with large module and multiple teeth. Background Art

[0002] The tooth profile of the existing disc type milling cutter for large module gears (Mn>12) is a straight line. After milling the tooth part of the gear, its tooth profile is an inclined tooth profile, and the uniformity of the tooth surface allowance is poor. After milling with the milling cutter, a hob is needed to roll cut the tooth surface to roll the inclined tooth profile into an involute tooth profile, and finally the hob is used to roll cut and process the tooth surface of the gear to the process requirements. Such a straight type milling cutter has low overall processing efficiency. And the roll cutting of the uneven tooth surface allowance reduces the service life of the hob. Content of the Utility Model

[0003] The purpose of the utility model is to provide a disc type milling cutter for involute profile gears with large module and multiple teeth, so as to improve the milling efficiency.

[0004] The technical scheme adopted by the utility model is: a disc type milling cutter for involute profile gears with large module and multiple teeth, which includes a cutter disc base body and blades fixed in corresponding blade grooves of the cutter disc base body by screws; the blades include left side cutting blades, right side cutting blades and top cutting blades;

[0005] The top cutting blades are arranged on the outer peripheral surface of the cutter disc base body;

[0006] A group of left cutting blades are composed of multiple left side cutting blades. The left side cutting blades in each group of left cutting blades are staggered with each other, and the effective cutting edge profile formed by the overlapping of the left side cutting blades in each group is an involute profile adapted to the theoretical tooth profile; the left side cutting blades are fixed in the left cutting area of the cutter disc base body;

[0007] A group of right cutting blades are composed of multiple right side cutting blades. The right side cutting blades in each group of right cutting blades are staggered with each other, and the effective cutting edge profile formed by the overlapping of the right side cutting blades in each group is an involute profile adapted to the theoretical tooth profile; the right side cutting blades are fixed in the right cutting area of the cutter disc base body.

[0008] Furthermore, multiple groups of left cutting blades and right cutting blades are evenly distributed along the circumferential direction of the cutter disc base body.

[0009] Furthermore, the number of the left side cutting blades is equal to the number of the right side cutting blades.

[0010] Furthermore, the cutting edges of the left side cutting blades and the right side cutting blades are designed according to the involute fitting of the tooth surfaces of several teeth.

[0011] Further, the top-edge blade includes a top-tooth blade and a top-side-tooth blade; the top-tooth blade is installed at the center of the outer peripheral surface of the cutter disk base body, and the top-side-tooth blades are stagger-toothed and distributed on both sides of the outer peripheral surface of the cutter disk base body;

[0012] The cutting edge of the top-side-tooth blade has a rounded corner transition, and the rounded cutting edge of the top-side-tooth blade has a root-cutting amount;

[0013] The cutting edge of the top-tooth blade is arc-shaped, and the cutting edge of the top-tooth blade and the cutting edge of the top-side-tooth blade overlap to form a rounded corner.

[0014] Further, a plurality of top-tooth blades are evenly distributed around the outer peripheral surface of the cutter disk base body; along the circumferential direction, two of the top-side-tooth blades are distributed between two adjacent top-tooth blades, and the two top-side-tooth blades are located on the left and right sides of the top-tooth blade along the axial direction of the cutter disk base body.

[0015] The beneficial effects of the present utility model are as follows: The involute profile gear disk-type milling cutter suitable for large module and multiple teeth disclosed by the present utility model combines a plurality of left-side-edge blades into a set of left-side cutting blades, and combines a plurality of right-side-edge blades into a set of right-side cutting blades. The cutting edge profiles of the left-side cutting blades and the right-side cutting blades are adapted to the tooth profile of the gear to be machined, so that the gear tooth profile after milling by the left-side-edge blades and the right-side-edge blades is an involute profile, and the tooth surface allowance is uniform. Compared with the tooth profile with poor uniformity of tooth surface allowance processed by the traditional milling method, the step of hobbing the tooth profile with uneven tooth surface allowance into an involute profile is reduced. Only a hob needs to be used for generating method hobbing to machine the gear tooth surface to the process requirements, saving processing procedures, being more efficient in cutting, more reliable in quality, and having low tool cost at the same time. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a left view of the present utility model;

[0018] Figure 3 is a schematic diagram of the cutting edge overlap of the present utility model.

[0019] In the figure, cutter disk base body 1, left-side-edge blade 2, right-side-edge blade 3, top-edge blade 4, top-tooth blade 41, top-side-tooth blade 42. Detailed Embodiments

[0020] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0021] The "left", "right", etc. indicating directions in the present utility model are all based on its usage state position, based on the attached Figure 3The orientation or positional relationship shown is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0022] The involute profile gear disc type milling cutter adapted to large module and multiple teeth numbers, such as Figure 1 , Figure 2 and Figure 3 shown, includes a cutter disc base body 1 and cutting blades fixed in corresponding blade slots of the cutter disc base body 1 by screws; the cutting blades include a left side cutting edge blade 2, a right side cutting edge blade 3, and a top cutting edge blade 4; the top cutting edge blade 4 is arranged on the outer peripheral surface of the cutter disc base body 1; a group of left cutting tools is formed by combining multiple left side cutting edge blades 2, and the left side cutting edge blades 2 in each group of left cutting tools are staggered, and the effective cutting edge profile formed by the overlapping of the left side cutting edge blades 2 in each group is an involute profile adapted to the theoretical tooth profile; the left side cutting edge blade 2 is fixed in the left cutting area of the cutter disc base body 1; a group of right cutting tools is formed by combining multiple right side cutting edge blades 3, and the right side cutting edge blades 3 in each group of right cutting tools are staggered, and the effective cutting edge profile formed by the overlapping of the right side cutting edge blades 3 in each group is an involute profile adapted to the theoretical tooth profile; the right side cutting edge blade 3 is fixed in the right cutting area of the cutter disc base body 1.

[0023] The involute profile gear disc type milling cutter disclosed by the present utility model forms a group of left cutting tools by combining multiple left side cutting edge blades 2 and a group of right cutting tools by combining multiple right side cutting edge blades 3. The cutting edge profile of the left cutting tools and the cutting edge profile of the right cutting tools are adapted to the tooth profile of the gear to be machined, that is, the cutting edge profile participating in gear cutting is an involute profile. Thus, the gear tooth profile after milling by the left side cutting edge blade 2 and the right side cutting edge blade 3 is an involute tooth profile, and its tooth surface allowance is uniform. Compared with the tooth profile with poor tooth surface allowance uniformity processed by the traditional milling method, it reduces the step of hobbing the tooth profile with non-uniform tooth surface allowance to an involute tooth profile. Only a hob needs to be used for generating method hobbing to machine the gear tooth surface to the process requirements, saving processing procedures, being more efficient in cutting, having more reliable quality, and at the same time, having low tool cost.

[0024] To further improve the milling efficiency, preferably, multiple groups of left cutting tools and right cutting tools are evenly distributed along the circumferential direction of the cutter disc base body 1.

[0025] The number of the left side cutting edge blades 2 is equal to the number of the right side cutting edge blades 3.

[0026] The cutting edges of the left blade 2 and the right blade 3 are designed according to the involute fitting of the tooth surface of a certain number of teeth, which is more applicable and can be extended to the processing of gears with other modules. For the same module, the pitch circles and sizes of gears with different numbers of teeth are different, and the involute profiles of the tooth surface will be different. There are multiple involute profiles for multiple numbers of teeth. The utility model fits multiple involute profiles to form a tool involute, which can process the profiles of multiple numbers of teeth at the same time.

[0027] Preferably, the top blade 4 includes a top tooth blade 41 and a top side tooth blade 42; the top tooth blade 41 is installed at the center of the outer peripheral surface of the cutter disc base 1, and the top side tooth blade 42 is staggered and distributed on both sides of the outer peripheral surface of the cutter disc base 1; the cutting edge of the top side tooth blade 42 is rounded, and the rounded cutting edge of the top side tooth blade 42 has a root digging amount; the cutting edge of the top tooth blade 41 is arc-shaped, and the cutting edge of the top tooth blade 41 overlaps with the cutting edge of the top side tooth blade 42 to form a rounded corner.

[0028] The top side tooth blade 42 is mainly used for root digging treatment, which prevents the gear from being deformed too much during heat treatment, resulting in step surfaces at the root of the gear after fine grinding, affecting subsequent use; moreover, when the gear is fine ground after heat treatment, the fillet of the root digging part is not processed, the root is in a compressive stress state, and the fatigue strength of the tooth root is increased.

[0029] The design of the top blade 4 makes the cut tooth root circle profile match the tooth root profile of the processed gear, and the tooth root margin is more uniform, which is convenient for subsequent processing to meet the process requirements.

[0030] In order to improve the milling efficiency, multiple top tooth blades 41 are evenly distributed around the outer circumference of the cutter disc base 1; along the circumferential direction, two top side tooth blades 42 are distributed between two adjacent top tooth blades 41, and the two top side tooth blades 42 are separated on the left and right sides of the top tooth blade 41 along the axial direction of the cutter disc base 1.

[0031] Figure 1 , Figure 2 and Figure 3 In the disclosed embodiment, six left-side blades 2 are combined to form a group of left-side cutting knives. The six left-side blades 2 are numbered as left-side blade 1 21, left-side blade 2 22, left-side blade 3 23, left-side blade 4 24, left-side blade 5 25, and left-side blade 6 26 in the radial direction of the cutter disc base 1. The specifications of these left-side blades 2 are the same, but the installation positions and directions are different. There are three groups of such left-side cutting knives along the circumferential direction of the cutter disc base 1.

[0032] Similarly, six right-side cutting blades 3 are combined into a set of right-side cutting tools. These six right-side cutting blades 3 are sequentially numbered as right-side cutting blade one 31, right-side cutting blade two 32, right-side cutting blade three 33, right-side cutting blade four 34, right-side cutting blade five 35, and right-side cutting blade six 36 from the outside to the inside along the radial direction of the cutter head base body 1. These right-side cutting blades 3 have the same specifications but different installation positions and directions. There are three sets of such right-side cutting tools along the circumferential direction of the cutter head base body 1.

[0033] Of course, this is only Figure 1 , Figure 2 and Figure 3 the situation shown in the disclosed embodiments. A set of left-side cutting tools or right-side cutting tools can also be composed of other numbers of blades.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The involute profile gear disc milling cutter adapted to large module and multiple teeth includes a cutter disc base body (1) and a cutter blade fixed in a corresponding blade groove of the cutter disc base body (1) by screws; it is characterized in that: The blade includes a left-edge blade (2), a right-edge blade (3) and a top-edge blade (4); The top-edge blade (4) is arranged on the outer peripheral surface of the cutter head base body (1); A group of left cutting blades are formed by combining multiple left-edge blades (2). In each group of left cutting blades, the left-edge blades (2) are staggered with each other, and the effective cutting edge profile formed by the overlapping of the left-edge blades (2) in each group is an involute profile adapted to the theoretical tooth profile; the left-edge blade (2) is fixed in the left cutting area of the cutter head base body (1); A group of right cutting blades are formed by combining multiple right-edge blades (3). In each group of right cutting blades, the right-edge blades (3) are staggered with each other, and the effective cutting edge profile formed by the overlapping of the right-edge blades (3) in each group is an involute profile adapted to the theoretical tooth profile; the right-edge blade (3) is fixed in the right cutting area of the cutter head base body (1).

2. The involute profile gear disc milling cutter adapted to large module and multiple teeth as claimed in claim 1, wherein: Multiple groups of left cutting blades and right cutting blades are evenly distributed along the circumferential direction of the cutter head base body (1).

3. The involute profile gear disk milling cutter adapted to large module and multiple teeth as claimed in claim 1 or 2, wherein: The number of the left-edge blades (2) is equal to the number of the right-edge blades (3).

4. The involute profile gear disk milling cutter adapted to large module and multiple teeth as claimed in claim 1 or 2, characterized in that: The cutting edges of the left-edge blade (2) and the right-edge blade (3) are designed by fitting the involute of the tooth surface according to a certain number of teeth.

5. The involute profile gear disk milling cutter adapted to large module and multiple teeth as claimed in claim 1 or 2, characterized in that: The top-edge blade (4) includes a top tooth blade (41) and a top side tooth blade (42); the top tooth blade (41) is installed at the center of the outer peripheral surface of the cutter head base body (1), and the top side tooth blades (42) are stagger-toothed and distributed on both sides of the outer peripheral surface of the cutter head base body (1); The cutting edge of the top side tooth blade (42) has a rounded corner transition, and the rounded cutting edge of the top side tooth blade (42) has a root cutting amount; The cutting edge of the top tooth blade (41) is in an arc shape adapted to the root circle of the gear tooth, and the cutting edge of the top tooth blade (41) overlaps with the cutting edge of the top side tooth blade (42) to form a rounded corner.

6. The involute profile gear disc milling cutter adapted to large module and multiple teeth numbers as claimed in claim 5, wherein: Multiple top tooth blades (41) are evenly distributed around the outer peripheral surface of the cutter head base body (1); along the circumferential direction, two of the top side tooth blades (42) are distributed between two adjacent top tooth blades (41), and the two top side tooth blades (42) are located on the left and right sides of the top tooth blade (41) along the axial direction of the cutter head base body (1).

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