CN113182618A - Method for processing linear contact arc tooth cylindrical gear - Google Patents

Method for processing linear contact arc tooth cylindrical gear Download PDF

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Publication number
CN113182618A
CN113182618A CN202110551486.8A CN202110551486A CN113182618A CN 113182618 A CN113182618 A CN 113182618A CN 202110551486 A CN202110551486 A CN 202110551486A CN 113182618 A CN113182618 A CN 113182618A
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cutter
tooth
shaft
gear
machined
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张学刚
谭兴强
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Panzhihua University
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Panzhihua University
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Priority to CN202110551486.8A priority Critical patent/CN113182618A/en
Publication of CN113182618A publication Critical patent/CN113182618A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F9/00—Making gears having teeth curved in their longitudinal direction
    • B23F9/08—Making gears having teeth curved in their longitudinal direction by milling, e.g. with helicoidal hob
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
    • G05B19/4099—Surface or curve machining, making 3D objects, e.g. desktop manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Gear Processing (AREA)

Abstract

The invention relates to the technical field of arc-tooth cylindrical gears, and provides a method for processing a line-contact arc-tooth cylindrical gear, which comprises the following steps of: s1, mounting the gear to be machined on the workpiece shaft; installing an outer milling cutter on a cutter shaft; s2, adjusting the initial positions of the workpiece shaft and the cutter shaft; s3, processing a concave tooth surface of the tooth groove by an outer milling cutter; s4, indexing the machined gear, and machining the concave tooth surfaces of the other tooth grooves; s5, unloading the outer milling cutter, and installing the inner milling cutter on the cutter shaft; s6, controlling the cutter shaft to move along the Z direction; s7, processing a convex tooth surface of the tooth socket by an inner milling cutter; and S8, indexing the machined gear, and machining convex tooth surfaces of the rest tooth grooves. The invention can process the linear contact arc-tooth cylindrical gear with the same circumferential tooth thickness by adopting the conventional arc-tooth milling cutter and the machine tool without independently developing a special processing cutter or a machine tool, has low processing cost and high efficiency, and can meet the requirements of market-oriented mass production and application.

Description

Method for processing linear contact arc tooth cylindrical gear
Technical Field
The invention relates to the technical field of arc-tooth cylindrical gears, in particular to a method for processing a line contact arc-tooth cylindrical gear.
Background
The arc-tooth cylindrical gear is a parallel shaft gear, and the tooth-shaped structure of the arc-tooth cylindrical gear is in an arc shape which is bent along the tooth width direction. In the meshing process, the gear pair is divided into a point contact arc-tooth cylindrical gear and a line contact arc-tooth cylindrical gear according to different contact forms of tooth surfaces.
In the meshing process of the point contact arc tooth cylindrical gear pair, the contact form on two paired tooth surfaces is local contact, the contact position is mainly concentrated at the position of the middle section of the tooth width, and the contact stress distribution is shown in figure 1. In the meshing process of the linear contact arc tooth cylindrical gear pair, the contact form on the two paired tooth surfaces is curved contact along the tooth width direction, and the contact stress distribution is shown in fig. 2. In fig. 1 and 2, the darker the color indicates the greater the contact stress.
At present, a point contact arc tooth cylindrical gear machining and forming method is available. For example, in the patent application with application number 90105655.3, entitled arc-tooth cylindrical gear and processing method, when the gear is processed, the cylindrical gear is milled by inner and outer edge blades fixed on a rotary cutter disc at the same time, the normal direction of the working base surface of the blades is changed along with a rotary disc constantly, the tooth groove widths in the normal direction of the tooth trace arc of the arc-tooth cylindrical gear processed by the method are equal, namely the normal groove widths of the gear are equal, but the circumferential groove widths of the gear are unequal, so that the tooth thickness in the circumferential direction of the gear is unequal, the circumferential tooth thickness of the gear edge is smaller than the circumferential tooth thickness in the middle of the gear, and the unequal circumferential angle included by the tooth trace arc is larger, the phenomenon is more obvious, and even two sides of the arc tooth are missing to influence the gear strength when the generating method is carried out. When the method is adopted to process the linear contact arc-tooth cylindrical gear, the circumferential tooth thickness of the edge of the gear is smaller than the circumferential tooth thickness of the middle part of the gear, so that the bearing capacity of the arc teeth of the linear contact arc-tooth cylindrical gear at the edge position is poor, and the linear contact arc-tooth cylindrical gear is easy to break in the transmission process.
At present, various machining and forming methods capable of achieving the linear contact arc-tooth cylindrical gear can machine the linear contact arc-tooth cylindrical gear with the same circumferential tooth thickness, guarantee stable meshing of a linear contact arc-tooth cylindrical gear pair and prevent the phenomenon that the linear contact arc-tooth cylindrical gear is broken. For example, the name of the authorized bulletin is CN103203647A, which is a translation processing device for circular arc toothed cylindrical gears; the application publication number is CN112170974A, and the name is an elliptic arc tooth trace cylindrical gear and a processing method thereof; the authorized notice number is CN101890540B, and the name is a processing method of the arc-tooth cylindrical gear; the name of the authorized notice is CN100335821C, namely, the arc-tooth cylindrical gear and the processing method and the processing device thereof. Although the above-mentioned several machining methods can indeed obtain the linear contact arc-tooth cylindrical gear meeting the strength requirement, all of them need to develop a special machining tool or machine tool separately, and such machining methods have high cost and low efficiency, and are difficult to achieve the purpose of marketable mass production and application.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for processing a linear contact arc-tooth cylindrical gear, which can process the linear contact arc-tooth cylindrical gear with equal circumferential tooth thickness without independently developing a special processing cutter or a machine tool.
The technical scheme adopted by the invention for solving the technical problems is as follows: the machining method of the linear contact arc-tooth cylindrical gear comprises the following steps of sequentially carrying out:
s1, mounting the gear to be machined on a workpiece shaft of the machining tool; installing an outer milling cutter on a cutter shaft of a processing machine tool; the workpiece shaft is arranged in parallel to the X direction, the cutter shaft is arranged in parallel to the Y direction, and the X direction is vertical to the Y direction; the outer milling cutter comprises a first cutter disc and a plurality of outer-edge cutter teeth which are uniformly distributed on the end face of the first cutter disc in the circumferential direction; the distance from the position on the tooth surface of the outer blade cutter tooth, which corresponds to the pitch circle of the machined gear, to the center line of the first cutter head is Rob;
s2, adjusting the initial positions of the workpiece shaft and the cutter shaft according to the design parameters of the gear to be processed; the distance between the central line of the workpiece shaft and the central line of the cutter shaft in the Z direction is Z1; the Z direction is respectively vertical to the X direction and the Y direction;
s3, controlling the cutter shaft to rotate around the axis of the cutter shaft, controlling the workpiece shaft to feed along the Y direction, and processing a concave tooth surface of a tooth groove by an outer milling cutter;
s4, when the concave tooth surface of one tooth groove is machined, the machined gear is indexed, and the step S3 is repeated until the concave tooth surfaces of all the tooth grooves are machined;
s5, unloading the outer milling cutter, and installing the inner milling cutter on a cutter shaft of the processing machine tool; the inner milling cutter comprises a second cutter head and a plurality of inner-edge cutter teeth which are uniformly distributed on the end face of the second cutter head in the circumferential direction; the distance from the position on the tooth surface of the inner-edge cutter tooth, which corresponds to the pitch circle of the machined gear, to the center line of the second cutter head is Rib(ii) a Wherein R isob＝Rib；
S6, controlling the cutter shaft to move along the Z direction, and enabling the distance between the central line of the workpiece shaft and the central line of the cutter shaft in the Z direction to be Z2; wherein, Z2 is Z1+ pi m/2; m is the module of the gear to be processed;
s7, controlling the cutter shaft to rotate around the axis of the cutter shaft, controlling the workpiece shaft to feed along the Y direction, and machining a convex tooth surface of a tooth socket by an inner milling cutter;
and S8, after the convex tooth surface of one tooth groove is machined, indexing the machined gear, and repeating the step S7 until the convex tooth surfaces of all the tooth grooves are machined.
Further, in step S2, the centerline of the outer cutter is coplanar with the tooth width intermediate section of the gear to be machined.
Further, the processing machine tool is a six-axis numerical control gear milling machine.
Furthermore, the outer milling cutter is arranged on a cutter shaft of the processing machine tool through a first fixed shaft which is coaxially fixed on the first cutter disc.
Furthermore, the inner milling cutter is arranged on a cutter shaft of the processing machine tool through a second fixed shaft which is coaxially fixed on a second cutter head.
The invention has the beneficial effects that: according to the method for machining the linear contact arc-tooth cylindrical gear, a special machining tool or a machine tool does not need to be independently developed, the linear contact arc-tooth cylindrical gear with the same circumferential tooth thickness can be machined by adopting a conventional arc-tooth milling cutter and the machine tool, the machining cost is low, the efficiency is high, and the market-oriented mass production and application can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a graph of contact stress of a point contact curved tooth cylindrical gear pair when engaged;
FIG. 2 is a graph of contact stress of a line contact curved tooth cylindrical gear pair when engaged;
FIG. 3 is a schematic structural view of a concave tooth flank of a tooth slot machined by an outside mill in an embodiment of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic structural view of a convex tooth surface of a tooth slot machined by an inner milling cutter in an embodiment of the present invention;
FIG. 6 is a cross-sectional view B-B of FIG. 5;
fig. 7 is a schematic view of a processing machine according to an embodiment of the present invention.
The reference numbers in the figures are: 1-a gear to be processed, 2-a processing machine tool, 3-an outer milling cutter, 4-an inner milling cutter, 11-a tooth groove, 21-a workpiece shaft, 22-a cutter shaft, 31-a first cutter disc, 32-an outer blade cutter tooth, 33-a first fixed shaft, 41-a second cutter disc, 42-an inner blade cutter tooth, 43-a second fixed shaft, 111-a concave tooth surface and 112-a convex tooth surface.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following further description is provided in conjunction with the accompanying drawings and examples. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Referring to fig. 3 to 7, a method for machining a linear contact helical gear according to an embodiment of the present invention includes the following steps performed in sequence:
s1, mounting the gear 1 to be machined on the workpiece shaft 21 of the machining tool 2; installing the outer milling cutter 3 on a cutter shaft 22 of the processing machine tool 2; wherein the workpiece shaft 21 is arranged parallel to the X direction, the cutter shaft 22 is arranged parallel to the Y direction, and the X direction is vertical to the Y direction(ii) a The outer milling cutter 3 comprises a first cutter disc 31 and a plurality of outer-edge cutter teeth 32 which are uniformly distributed on the end surface of the first cutter disc 31 in the circumferential direction; the distance from the position on the tooth surface of the outer cutting edge cutter tooth 32 corresponding to the pitch circle of the gear 1 to be machined to the center line of the first cutter disc 31 is Rob；
S2, adjusting the initial positions of the workpiece shaft 21 and the cutter shaft 22 according to the design parameters of the gear 1 to be processed; wherein, the distance between the central line of the workpiece shaft 21 and the central line of the cutter shaft 22 in the Z direction is Z1; the Z direction is respectively vertical to the X direction and the Y direction;
s3, controlling the cutter shaft 22 to rotate around the axis of the cutter shaft, controlling the workpiece shaft 21 to feed along the Y direction, and processing a concave tooth surface 111 of a tooth groove 11 by the outer milling cutter 3;
s4, after the concave tooth surface 111 of one tooth slot 11 is machined, the machined gear 1 is divided, and the step S3 is repeated until the machining of the concave tooth surfaces 111 of all the tooth slots 11 is completed;
s5, unloading the outer milling cutter 3, and installing the inner milling cutter 4 on the cutter shaft 22 of the processing machine tool 2; the inner milling cutter 4 comprises a second cutter disc 41 and a plurality of inner-edge cutter teeth 42 which are uniformly distributed on the circumference of the end face of the second cutter disc 41; the distance from the position on the tooth surface of the inner cutter tooth 42 corresponding to the pitch circle of the gear 1 to be machined to the center line of the second cutter disc 41 is Rib(ii) a Wherein R isob＝Rib；
S6, controlling the cutter shaft 22 to move along the Z direction, and enabling the distance between the central line of the workpiece shaft 21 and the central line of the cutter shaft 22 in the Z direction to be Z2; wherein, Z2 is Z1+ pi m/2; m is the modulus of the gear 1 to be machined;
s7, controlling the cutter shaft 22 to rotate around the axis of the cutter shaft, controlling the workpiece shaft 21 to feed along the Y direction, and processing a convex tooth surface 112 of a tooth groove 11 through the inner milling cutter 4;
s8, after the convex tooth surface 112 of one tooth slot 11 is machined, the machined gear 1 is indexed, and the step S7 is repeated until the machining of the convex tooth surfaces 112 of all the tooth slots 11 is completed.
The processing machine 2 is a device for processing an arc-tooth cylindrical gear. In the embodiment of the present invention, the processing machine 2 is preferably a six-axis numerical control gear milling machine. Of course, the processing machine 2 may be other common machine tools, and is not limited in particular.
A specific structure of the processing machine 2 is shown in fig. 7.
Referring to fig. 7, the X direction, the Y direction and the Z direction in the figure are three mutually perpendicular directions, wherein the X direction and the Y direction are two horizontal directions, and the Z direction is a vertical direction. The processing machine 2 is provided with a workpiece shaft 21 and a cutter shaft 22 which are horizontally arranged. The workpiece shaft 21 can rotate around the axis thereof, the workpiece shaft 21 can also rotate around a vertical central line in the horizontal plane, and the workpiece shaft 21 can also reciprocate along the Y direction. The knife shaft 22 can rotate around the axis of the knife shaft 22, the knife shaft 22 is arranged in parallel to the Y direction, and the knife shaft 22 can respectively reciprocate along the X direction and the Z direction. The workpiece shaft 21 is used for mounting the gear 1 to be machined; the cutter shaft 22 is used for mounting a curved-tooth milling cutter.
The following describes a method for machining a linear contact helical gear according to an embodiment of the present invention with reference to the structure of the machining tool 2 shown in fig. 3 to 6 and fig. 7.
In step S1, the gear 1 to be machined is mounted on the workpiece shaft 21 of the machining tool 2, so that the gear 1 to be machined is ensured to be coaxial with the workpiece shaft 21, and the gear 1 to be machined can be driven to rotate around its own axis by the workpiece shaft 21. The position of the work shaft 21 is adjusted so that the axis of the work shaft 21 is parallel to the X direction.
The outer cutter 3 is used for machining a concave tooth surface 111 of a tooth groove 11 of the gear 1 to be machined. Referring to fig. 3, the outer milling cutter 3 includes a first cutter disc 31 having a disc shape, a plurality of outer cutter teeth 32 which are circumferentially and evenly arranged on a right end surface of the first cutter disc 31 with an axis of the first cutter disc 31 as a center, and a first fixed shaft 33 coaxially fixed on a left end surface of the first cutter disc 31. The side of the outer cutting edge tooth 32 facing the edge of the first cutter disk 31 has an arcuate convex tooth surface for fitting into the concave tooth surface 111 of the tooth slot 11. The distance from the position on the arc convex tooth surface of the outer blade cutter tooth 32 corresponding to the pitch circle of the gear 1 to be processed to the center line of the first cutter disc 31 is Rob。
The outer milling cutter 3 is arranged on the cutter shaft 22 of the processing machine tool 2, specifically, the first fixed shaft 33 is arranged on the cutter shaft 22 of the processing machine tool 2, so that the outer milling cutter 3 and the cutter shaft 22 are coaxial, and the outer milling cutter 3 is driven to rotate around the axis of the outer milling cutter 3 through the cutter shaft 22. The cutter shaft 22 is parallel to the Y direction, so that when the workpiece shaft 21 is adjusted to be parallel to the X direction, the state that the axis of the gear 1 to be machined is perpendicular to the axis of the outer milling cutter 3 can be ensured.
In step S2, the initial positions of the workpiece spindle 21 and the arbor 22 are adjusted according to the design parameters of the gear 1 to be machined. Specifically, the positions of the cutter shaft 22 in the X direction and the Z direction are adjusted according to the design parameters of the gear 1 to be machined. For example, referring to fig. 3, the positions of the cutter shaft 22 in the X direction and the Z direction can be adjusted, so that the center line of the outer milling cutter 3 is located below the center line of the gear 1 to be machined, and the outer cutting teeth 32 of the outer milling cutter 3 face the left 180 ° position of the gear 1 to be machined, and at this time, the distance between the center line of the gear 1 to be machined and the center line of the outer milling cutter 3 in the Z direction is Z1. Of course, after the initial positions of the workpiece shaft 21 and the cutter shaft 22 are adjusted, the center line of the outer milling cutter 3 may be located above the center line of the gear 1 to be machined, and is not limited in detail here.
Preferably, the central line of the outer milling cutter 3 is coplanar with the middle section of the tooth width of the gear 1 to be machined. Referring to fig. 4, an arc-shaped tooth slot symmetrical about the middle section of the tooth width can be manufactured.
In step S3, the machine tool 2 is started to machine the gear 1 to be machined. Specifically, referring to fig. 3, the control cutter shaft 22 rotates around its axis to drive the outer milling cutter 3 to rotate, the control workpiece shaft 21 feeds along the Y direction, and the outer milling cutter 3 machines the concave tooth surface 111 of one tooth slot 11 at a position 180 ° on the left side of the gear 1 to be machined, as shown in fig. 4, the radius of the concave tooth surface 111 of the tooth slot 11 at the pitch circle position of the gear is Rob。
In step S4, after the concave tooth surface 111 of one tooth slot 11 is machined in the gear 1, the gear 1 is then indexed, and step S3 is repeated to machine the concave tooth surfaces 111 of the remaining tooth slots 11 in the gear 1.
In step S5, the inner cutter 4 is used to machine the convex tooth surface 112 of the tooth slot 11 of the gear 1 to be machined. With reference to fig. 5, the inner milling cutter 4 comprises a second cutter in the shape of a discThe cutter disc 41 is provided with a plurality of inner-edge cutter teeth 42 which are circumferentially and uniformly arranged on the right end surface of the second cutter disc 41 and are centered on the axis of the second cutter disc 41, and a second fixed shaft 43 which is coaxially fixed on the left end surface of the second cutter disc 41. The side of the inner-edge cutter teeth 42 facing the center of the second cutter disk 41 has an arc-shaped concave tooth surface for fitting with the convex tooth surface 112 of the tooth groove 11. The distance from the position on the arc concave tooth surface of the inner-edge cutter tooth 42 corresponding to the pitch circle of the gear 1 to be machined to the center line of the second cutter disc 41 is Rib(ii) a Wherein R isob＝Rib。
After the concave tooth surfaces 111 of all tooth grooves 11 on the gear 1 to be machined are machined, the outer milling cutter 3 is removed, the positions of the workpiece shaft 21 in the Y direction and the Z direction are ensured to be unchanged, the positions of the cutter shaft 22 in the X direction and the Z direction are ensured to be unchanged, and then the inner milling cutter 4 is installed on the cutter shaft 22 of the machining machine tool 2. Specifically, the second fixing shaft 43 is mounted on the cutter shaft 22 of the processing machine tool 2, so that the inner milling cutter 4 is ensured to be coaxial with the cutter shaft 22, and the inner milling cutter 4 is driven to rotate around the axis of the inner milling cutter 4 through the cutter shaft 22.
In step S6, the cutter shaft 22 is controlled to move in the Z direction so that the distance between the center line of the workpiece shaft 21 and the center line of the cutter shaft 22 in the Z direction is Z2; wherein, Z2 is Z1+ pi m/2; m is the module of the gear 1 to be machined. Specifically, referring to fig. 5, since the center line of the inner milling cutter 4 is located below the center line of the gear 1 to be machined, the cutter shaft 22 is controlled to move downward by pi m/2 along the Z direction, at this time, the inner cutting teeth 42 of the inner milling cutter 4 face the position 180 ° on the left side of the gear 1 to be machined, and the distance between the center line of the gear 1 to be machined and the center line of the inner milling cutter 4 in the Z direction is Z2.
Of course, when the center line of the outer milling cutter 3 is located above the center line of the gear 1 to be machined in step S2, the cutter shaft 22 should be controlled to move upward by pi m/2 in the Z direction in step S6.
In step S7, the machine tool 2 is started to machine the gear 1 to be machined. Specifically, referring to fig. 5, the control cutter shaft 22 rotates around its axis to drive the inner milling cutter 4 to rotate, the control workpiece shaft 21 feeds along the Y direction, and the convex tooth surface 112 of one tooth space 11 is machined at a position 180 ° on the left side of the gear 1 to be machined by the inner milling cutter 4,as shown in FIG. 6, the convex tooth surface 112 of the tooth groove 11 has a radius R at the pitch circle position of the gearibThus, a tooth groove 11 is finished.
In step S8, after the convex tooth surface 112 of one tooth slot 11 is machined on the gear 1 to be machined, the gear 1 to be machined is then indexed, and step S7 is repeated to sequentially machine the convex tooth surfaces 112 of the remaining tooth slots 11 on the gear 1 to be machined.
When the processing of the concave tooth surfaces 111 and the convex tooth surfaces 112 of all the tooth grooves 11 of the gear 1 to be processed is completed, the gear 1 to be processed and the internal milling cutter 4 can be removed. According to the method for processing the linear contact arc-tooth cylindrical gear, provided by the embodiment of the invention, as the radii of the concave tooth surface 111 and the convex tooth surface 112 of the tooth groove 11 are equal, the widths of the tooth groove 11 along the circumferential direction of the gear are equal, namely, the circumferential tooth thicknesses of the gear are equal.
Compared with the prior art, the method for machining the linear contact arc-tooth cylindrical gear provided by the embodiment of the invention has the advantages that a special machining tool or a machine tool does not need to be independently developed, the linear contact arc-tooth cylindrical gear with the same circumferential tooth thickness can be machined by adopting a conventional arc-tooth milling cutter and the machine tool, the machining cost is low, the efficiency is high, and the market-oriented mass production and application can be met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The machining method of the linear contact arc-tooth cylindrical gear is characterized by comprising the following steps of:
s1, mounting the gear (1) to be machined on a workpiece shaft (21) of the machining machine tool (2); installing an outer milling cutter (3) on a cutter shaft (22) of a processing machine tool (2); the workpiece shaft (21) is arranged in parallel to the X direction, the cutter shaft (22) is arranged in parallel to the Y direction, and the X direction is vertical to the Y direction; the outer milling cutter (3) comprises a first cutter head (31) and a plurality of outer-edge cutters uniformly distributed and installed on the end surface of the first cutter head (31)A tooth (32); the distance from the position on the tooth surface of the outer cutting edge cutter tooth (32) corresponding to the pitch circle of the gear (1) to be processed to the center line of the first cutter disc (31) is Rob；
S2, adjusting the initial positions of the workpiece shaft (21) and the cutter shaft (22) according to the design parameters of the gear (1) to be processed; wherein the distance between the central line of the workpiece shaft (21) and the central line of the cutter shaft (22) in the Z direction is Z1; the Z direction is respectively vertical to the X direction and the Y direction;
s3, controlling the cutter shaft (22) to rotate around the axis of the cutter shaft, controlling the workpiece shaft (21) to feed along the Y direction, and processing a concave tooth surface (111) of a tooth groove (11) by the outer milling cutter (3);
s4, after the concave tooth surface (111) of one tooth groove (11) is machined, the machined gear (1) is divided, and the step S3 is repeated until the concave tooth surfaces (111) of all the tooth grooves (11) are machined;
s5, unloading the outer milling cutter (3), and installing the inner milling cutter (4) on a cutter shaft (22) of the processing machine tool (2); the inner milling cutter (4) comprises a second cutter disc (41) and a plurality of inner-edge cutter teeth (42) which are uniformly distributed on the circumference of the end face of the second cutter disc (41); the distance from the position on the tooth surface of the inner cutting edge cutter tooth (42) corresponding to the pitch circle of the gear (1) to be processed to the center line of the second cutter disc (41) is Rib(ii) a Wherein R isob＝Rib；
S6, controlling the cutter shaft (22) to move along the Z direction, and enabling the distance between the central line of the workpiece shaft (21) and the central line of the cutter shaft (22) in the Z direction to be Z2; wherein, Z2 is Z1+ pi m/2; m is the modulus of the gear (1) to be machined;
s7, controlling the cutter shaft (22) to rotate around the axis of the cutter shaft, controlling the workpiece shaft (21) to feed along the Y direction, and processing a convex tooth surface (112) of a tooth groove (11) through the inner milling cutter (4);
s8, when the convex tooth surface (112) of one tooth groove (11) is machined, the machined gear (1) is divided, and the step S7 is repeated until the convex tooth surfaces (112) of all the tooth grooves (11) are machined.
2. The method for machining a linear contact arc toothed cylindrical gear according to claim 1, wherein in step S2, the centerline of the outer cutter (3) is coplanar with the face width median cross-section of the gear (1) being machined.
3. A method of machining a cylindrical gear with line contact and curved teeth according to claim 1, characterized in that the machine tool (2) is a six-axis numerical control gear milling machine.
4. A method of machining a cylindrical gear with linear contact and curved teeth according to claim 1, characterized in that the outer milling cutter (3) is mounted on the cutter shaft (22) of the machine tool (2) by means of a first fixed shaft (33) coaxially fixed to the first cutter head (31).
5. A method of machining a cylindrical gear with linear contact and curved teeth according to claim 1, characterized in that the inner milling cutter (4) is mounted on the cutter shaft (22) of the machine tool (2) by means of a second fixed shaft (43) coaxially fixed to the second cutter head (41).
CN202110551486.8A 2021-05-20 2021-05-20 Method for processing linear contact arc tooth cylindrical gear Withdrawn CN113182618A (en)

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CN202110551486.8A CN113182618A (en) 2021-05-20 2021-05-20 Method for processing linear contact arc tooth cylindrical gear

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113681088A (en) * 2021-09-26 2021-11-23 重庆齿轮箱有限责任公司 High-precision cylindrical gear milling machining method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113681088A (en) * 2021-09-26 2021-11-23 重庆齿轮箱有限责任公司 High-precision cylindrical gear milling machining method

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Application publication date: 20210730