A method for machining micro-drum cylindrical gears using an obliquely mounted machining disc

Abstract

The invention discloses a method for machining a micro-drum-shaped cylindrical gear by using an obliquely installed machining disc, comprising the following steps: mounting a gear blank to be machined on a rotating table; adjusting the inclination angle of the machining disc according to the amount of drum shape to be machined; the machining disc rotates, and when cutting the gear blank, the gear blank does not perform a rotating motion but only performs a feeding motion, and after a tool completes cutting, the gear blank performs a feeding motion in a direction close to a large machining disc to cut out the thickness of the gear teeth; after cutting the left half of the tooth groove, the gear blank is directly subjected to a development process; after cutting and developing half of the tooth groove, the gear blank is withdrawn and indexed by 1 / Z circle, and then the lower half of the tooth groove is cut and developed, and when one side of all the tooth grooves is cut and developed, the machining disc rotates so that the other side is close to the gear blank, and after tool alignment, the tooth grooves on the other side of the gear are cut and developed; the invention can directly process a cylindrical gear with a drum shape.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a method for processing a micro-drum cylindrical gear by using an obliquely installed processing disc. Background Art

[0002] The tooth surface of the commonly used standard gear is a theoretical involute, which is widely used in the fields of automobiles, machine tools, etc. In the meshing process of the gear pair, due to the local elastic deformation of the tooth top, the tooth tip angle often hits the tooth surface of another gear first when the gear tooth meshes into the tooth groove, resulting in greater impact and noise. The drum gear can effectively reduce the meshing noise of the cylindrical gear because the contact line is distributed in the middle of the gear teeth and is narrow on both sides during meshing. In the prior art, CN 109834339 A discloses a method for modifying an involute gear, which mainly includes the following steps: when processing the involute gear, performing a drum-shaped modification on the involute tooth profile of the involute gear, so that the modified involute tooth profile curve of the modified involute gear is drum-shaped compared with the involute tooth profile of the theoretical involute gear, and performing a tooth direction modification on the tooth width direction of the involute gear, so that the tooth direction of the modified involute gear is a drum-shaped curve with a large middle and small ends. Different devices need to be used to process the involute tooth profile and the drum shape respectively, and the processing efficiency is not high. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above and / or existing problems in the processing of drum-shaped cylindrical gears, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a method for machining micro-crown cylindrical gears using an obliquely mounted machining disc, which can directly machine cylindrical gears with a crown shape.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for machining a micro-drum cylindrical gear using an obliquely mounted machining disc, comprising the following steps:

[0007] Install the gear blank to be processed on the rotating table;

[0008] The tool is mounted on the processing rod, and each processing rod is mounted on the processing disc;

[0009] Adjust the tilt angle of the processing disc according to the amount of drum shape to be processed;

[0010] The machining disc rotates. When the gear blank is cut deeply, the gear blank does not rotate but only feeds. After one tool completes the cutting, the gear blank feeds in the direction close to the large machining disc to cut out the thickness of the gear teeth.

[0011] After cutting the left half tooth groove, i.e. the slightly convex tooth surface on the right side of the gear tooth, the gear blank is directly subjected to the expansion process;

[0012] After the half-tooth groove is cut and developed, the gear blank is retracted and indexed 1 / Z circle, and then the second half of the tooth groove is cut and developed. When the cutting and development of one side of all the tooth grooves are completed, the processing disc is rotated to make the other side close to the gear blank. After the tool is set, the tooth groove on the other side of the gear is cut and developed.

[0013] Where Z is the number of teeth.

[0014] As a further improvement of the present invention, the gear blank does not make a feed motion during the generating process, and the gear blank rotates around Z at an angular velocity ω'. C Rotate clockwise at a speed of Along X C The axis moves in the positive direction to complete the development of the slightly convex tooth surface on the right side of the gear tooth; establish the coordinate system O C X C Y C Z C , with the center of the gear blank as the origin O C , origin O C The horizontal forward direction is X C Axis positive direction, origin O C The direction of horizontal extension to the right is Y C Axis positive direction, origin O C The vertical upward direction is Z C The positive direction of the axis, where m is the module and z' is the number of teeth.

[0015] As a further improvement of the present invention, the drum shape of the gear blank to be processed is determined based on four parameters: gear module m, tooth width B, inclination angle θ of the processing disk, and radius R of the processing disk. The drum shape is reversed by the gear module m, tooth width B, trajectory radius R of the vertex of the outer end of the tool, and the required drum shape.

[0016] As a further improvement of the present invention, the method for calculating the drum shape is:

[0017] The conical surface formed by the tool's blade trajectory is cut to obtain the tooth line at the pitch circle on one side of the gear tooth. The tooth line equation is:

[0018] The intersection point of the tooth line and the gear end face is The midpoint of line segment A1A2 is A3(xa ,0,z a ), the intersection of the tooth line and the midline of the tooth width is B(x b ,0,z b );

[0019] The drum volume is

[0020] In order to further improve the reliability of the connection between the tool and the processing rod, a plurality of processing grooves are arranged at the front end of the processing disc, and the processing rod includes a connecting part, and a processing part is fixed at one end of the connecting part extending outside the processing disc, and the connecting part is inserted into the processing groove, and the connecting part is fixedly connected to the processing disc. A connecting groove is opened at the outer end of the processing part, and the tool is inserted in the connecting groove and fixedly connected to the outer end of the processing part.

[0021] In order to improve the reliability of the connection between the processing rod and the processing disc, a first card is connected to the outer side of the processing disc near the processing groove, and the first card is pressed tightly on the front side of the connecting part, and a second card is connected to the outer side of the processing part near the connecting groove, and the second card is pressed tightly on the tool.

[0022] In order to further facilitate the adjustment of the tool inclination angle, the processing disc is provided with a plurality of mounting ports for mounting the tool and connecting ports corresponding to the mounting ports one by one. The processing discs at both ends of the mounting ports are respectively connected with a first connecting member and a second connecting member. The end of the first connecting member extending into the corresponding mounting port is connected with a first clamping block, and the end of the second connecting member extending into the corresponding mounting port is connected with a second clamping block. The first clamping block and the second clamping block can clamp the tool at the same time.

[0023] In order to further improve the reliability of the connection between the processing rod and the processing disc, a guide opening is opened on the processing rod, and a fastening bolt is used to pass through the guide opening and connect with the processing disc, so that the pressing part of the fastening bolt is pressed on the limit step of the processing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 The three-dimensional structure of the processing rod installed on the processing disc in the present invention Figure 1 .

[0027] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0028] Figure 4 The three-dimensional structure of the processing rod installed on the processing disc in the present invention Figure 2 .

[0029] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0030] Figure 6 This is a schematic diagram of the processing principle of the micro-drum cylindrical gear in the present invention.

[0031] Figure 7 for Figure 6 View from CC in the middle.

[0032] Figure 8 The figure is a schematic diagram of the processing principle of the right tooth surface of the micro-drum cylindrical gear in the present invention.

[0033] Fig. 9 The figure is a schematic diagram of the processing principle of the left tooth surface of the micro-drum cylindrical gear in the present invention.

[0034] Fig.10 It is a schematic diagram of the principle of developing the right tooth surface of the micro-drum cylindrical gear in the present invention.

[0035] Fig.11 It is a schematic diagram of the principle of developing the left tooth surface of the micro-drum cylindrical gear in the present invention.

[0036] Fig.12 The three-dimensional structural diagram of the drum-shaped cylindrical gear processed by the present invention is shown in FIG.

[0037] Fig.13 This is the structural diagram of a single tooth in a drum cylindrical gear.

[0038] Fig.14 This is a schematic diagram of the meshing assembly of a pair of micro-drum cylindrical gears with a diameter of 180 mm and a diameter of 90 mm in the present invention.

[0039] Fig.15 for Fig.14 A partial enlarged view of point D in the middle.

[0040] In the figure, 1 is a transmission motor, 2 is a second slide, 3 is a processing platform, 4 is a disc mounting bracket, 5 is an angle adjustment motor, 6 is a tool, 7 is a processing rod, 701 is a connecting part, 702 is a processing part, 703 is a limit step, 8 is a processing disc, 9 is a gear blank, 10 is a rotating table, 11 is a transmission seat, 12 is a second fixing bolt, 13 is a first card, 14 is a first fixing bolt, 15 is a third fixing bolt, 16 is a second card, 17 is a first nut, 18 is a first connecting piece, 19 is a first clamping block, 20 is a fastening bolt, 21 is a second clamping block, 22 is a second nut, 23 is a second connecting piece, a is a processing sink, b is a connecting sink, c is a mounting port, d is a connecting port, f is a tool trajectory, g is a plane Σ, and h is a conical surface. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] Example 1

[0045] Reference Figure 1 to Figure 3 , Figure 6 to Figure 15 , which is the first embodiment of the present invention, provides a method for machining micro-drum-shaped cylindrical gears using an obliquely installed machining disc, which can directly machine cylindrical gears with a drum shape.

[0046] A method for machining a micro-drum cylindrical gear using an obliquely mounted machining disc 8 comprises the following steps:

[0047] (S1) installing the gear blank 9 to be processed on the rotating table 10;

[0048] (S2) installing the tool 6 onto the processing rod 7;

[0049] (S3) adjusting the inclination angle of the processing disc 8 according to the drum shape to be processed, and installing each processing rod 7 on the processing disc 8 so that the central axis of the tool 6 is aligned with the center of the gear blank 9;

[0050] (S4) The processing disc 8 rotates. When the gear blank 9 is cut deep, the gear blank 9 does not rotate but only feeds. After the cutting of one tool 6 is completed, the gear blank feeds in the direction close to the large processing disc 8 to cut out the thickness of the gear teeth. When the tool 6 cuts deep, two slightly convex and slightly concave surfaces are formed. One deep cutting process only completes the processing of half of a tooth groove. Two deep cutting processes complete the processing of a tooth groove, so that both sides of the tooth groove are slightly convex surfaces. After cutting the left half tooth groove, that is, the slightly convex tooth surface on the right side of the gear tooth, the gear blank 9 is directly expanded. After cutting and expanding half of the tooth groove, the gear blank 9 is retracted and indexed by 1 / Z circle, and then the cutting and expanding of the lower half of the tooth groove are carried out. During the expansion process, the gear blank 9 does not feed. The gear blank 9 rotates around Z at an angular velocity ω'. C Rotate clockwise at a speed of Along X C The axis moves in the positive direction to complete the development of the slightly convex tooth surface on the right side of the gear tooth. When the cutting depth and development of one side of all the tooth grooves are completed, the processing disc 8 is rotated to make the other side close to the gear blank 9. After the tool is set, the cutting depth and development of the tooth groove on the other side of the gear are carried out until the cutting depth and development of all the tooth grooves are completed.

[0051] Where Z is the number of teeth; establish coordinate system O C X C Y C Z C , with the center of the gear blank 9 as the origin O C , origin O C The horizontal forward direction is X C Axis positive direction, origin O C The direction of horizontal extension to the right is Y C Axis positive direction, origin O C The vertical upward direction is Z C The positive direction of the axis, where m is the module and z' is the number of teeth.

[0052] The structure used for mounting the gear blank 9 and the processing disc 8 during processing is arranged on the processing machine tool, the processing platform 3 is connected to the machine tool, the first slide seat and the second slide seat 2 which can slide left and right are slidably connected on the processing platform 3, the first slide seat is equivalent to a gearbox, the upper end of the first slide seat is fixedly connected to the gearbox to transmit power to the angle adjustment motor 5 for adjusting the inclination angle of the processing disc 8, the first slide seat is connected to a vertically arranged disc mounting bracket 4, the angle adjustment motor 5 and the disc mounting bracket 4 are transmission-connected, the disc mounting bracket 4 is fixedly connected to the processing motor, and the processing motor The machine is connected to the processing disc 8 by transmission, the second slide 2 is connected with a transmission seat 11 which slides back and forth along the length direction of the second slide 2, the upper end of the transmission seat 11 is fixedly connected with a transmission motor 1 for driving the gear blank 9 to rotate, the transmission seat 11 is rotatably connected with a rotating table 10, the transmission seat 11 is equivalent to a power box for power transmission, the transmission motor 1 is connected to the rotating table 10 through the transmission structure inside the transmission seat 11, the transmission motor 1 is connected to the rotating table 10, and the structure for realizing the rotation of the disc mounting bracket 4 and the rotating table 10 is prior art and will not be repeated here.

[0053] In actual implementation, a structure for respectively driving the first slide and the second slide 2 to adjust their positions in the left-right direction, and a structure for driving the transmission seat 11 to adjust their positions in the front-rear direction may be provided on the processing platform 3 .

[0054] The gear blank 9 is mounted on the rotating table 10, which is driven by the transmission motor 1 to rotate around Z C Rotate the table 10 along the machine tool Y C The rotary table 10 can move along the X axis of the machine tool to achieve the deep cutting of the tooth surface. C The tool 6 makes a linear motion in the axial direction to realize the tooth surface development processing. According to the design parameters and drum shape of the processed gear, the trajectory radius R of the vertex of the outer end of the tool 6 and the relationship between the processing disc 8 and the X C O C Z C In this embodiment, there are 4 processing rods 7 on the processing disc 8, and the angle between two adjacent processing rods 7 is 90°; during the cutting process, the first to third processing rods roughly cut out the tooth shape in sequence, and then the fourth processing rod 7 performs precise cutting. C The feed is completed by linear motion in the axial direction. When the right side of the processing disc 8 is close to the gear blank 9, the processing disc 8 rotates one circle to complete the cutting depth of the left half of the tooth groove. After the cutting depth of the left half of a tooth groove is completed, the left half of the tooth groove is expanded, such as Figure 8 The figure shows the motion relationship of the left half of the tooth groove. During the development, the processing disc 8 rotates and the rotating table 10 moves at an angular velocity w. cThe gear blank is driven to rotate, and at the same time, the transmission seat 11 drives the rotating table 10 along the X direction of the machine tool. C The axis moves in the positive direction to complete the development of the right side of a gear tooth. When the cutting and development of the left side of a gear tooth is completed, the second slide 2 moves along the Y C The turntable 10 drives the gear blank 9 to rotate one tooth, and then continues the cutting and developing process of the left half of the next tooth groove. When the cutting and developing process of the left half of all tooth grooves are completed, the second slide 2 drives the turntable 10 along the Y C The angle adjustment motor 5 moves, and the disc mounting bracket 4 rotates, so that the processing disc 8 is aligned with the X C O C Z C The angle of the surface is the set inclination angle θ and the left side of the processing disc 8 is close to the gear blank 9. The cutting depth and expansion processing of the right half of the tooth groove are the same as the cutting depth and expansion processing of the left half of the tooth groove, which will not be repeated.

[0055] In step (S3), the drum shape of the gear blank 9 to be processed is determined based on four parameters: the gear module m, the tooth width B, the inclination angle θ of the processing disk 8, and the radius R of the processing disk 8. The inclination angle of the processing disk 8 is reversed by the gear module m, the tooth width B, the trajectory radius R of the outer end vertex of the tool 6 and the required drum shape.

[0056] like Figure 6 As shown, the processing disc 8 plane g and X C O C Z C The angle between the surface and the angle between the center axis of the processing rod 7 and the processing disk 8 are both θ, that is, the center axis of the processing rod 7 is perpendicular to the X C O C Z C When machining a micro-drum cylindrical gear, the machining disk 8 rotates clockwise at a constant speed. At this time, the motion trajectory of the tool 6 is at X C O C Z C The surface is an ellipse with a major semi-axis a = R and a minor semi-axis b = R*cosθ (where R is the trajectory radius of the right vertex of the tool 6, and θ is the distance between the plane of the processing disk 8 and X C O C Z C The angle between the two surfaces), passing through the tool 6 width m and X C O C Z C The conical surface formed by the blade trajectory of tool 6 is cut by a plane Σ parallel to the surface, and the tooth line at the pitch circle on one side of the gear tooth can be obtained, as shown in Figure 7 As shown, the center of the processing disk 8 is the origin O D Establish coordinate system S D (O D XD Y D Z D ), the part parallel to the surface of the processing disc 8 and extending away from the direction where the gear blank 9 is located is X D Positive direction of axis, perpendicular to X D The axis is tilted and extends backward in the direction of Z D Positive direction of axis, perpendicular to X D O D Y D The direction of the plane and vertically extending upward is Y D Axis positive direction, coordinate system S D Along Z D The axis is translated in the positive direction by Rtan(θ+20°) to obtain the coordinate system S D '(O D 'X D 'Y D 'Z D '), the conical surface formed by the blade trajectory of the tool 6 is in the coordinate system S D The equation in ' can be obtained by Find, for z 2 =tan 2 (70°-θ)(x 2 +y 2 ), where the gear pressure angle is 20°, and (x0, y0, 0) is the circular trajectory formed by the movement of the tool tip 6 in the coordinate system S D '(O D 'X D 'Y D 'Z D '), z0 is the vertex of the cone formed by the blade trajectory in the coordinate system S D '(O D 'X D 'Y D 'Z D ') D coordinates, t is the parameter, (x, y, z) is the conical surface formed by the blade trajectory in the coordinate system S D '(O D 'X D 'Y D 'Z D The coordinates of any point in the coordinate system S are obtained by translational coordinate transformation. D The equation in is (z-Rtan(70°-θ)) 2 =tan 2 (70°-θ)(x 2 +y 2 ), the plane Σ is in the coordinate system S D The equation in is: Then the tooth line equation is:

[0057] The equations can be written as: (x d ,y d , z d ) is the tooth line in the coordinate system S D (O D X D Y D Z D ),

[0058] The intersection point of the tooth line and the gear end face is The midpoint of line segment A1A2 is A3(x a ,0,z a ), the intersection of the tooth line and the midline of the tooth width is B(x b ,0,z b );

[0059] The drum volume is It can be seen from the above that the drum shape of the cylindrical gear after processing can be determined according to the gear module m, tooth width B, inclination angle θ of the processing disk 8, and radius R of the processing disk 8; for example, when the gear module m=3, tooth width B=30, trajectory radius R=500mm of the right vertex of the tool 6, and inclination angle θ of the processing disk 8 is between 65° and 70°, the drum shape of the gear is between 0 and 0.1621mm.

[0060] The tooth width of the processed micro-drum cylindrical gear is bulging at the midline, narrow on both sides, with a small amount of drum shape, and the whole is symmetrical. The whole tooth model is as follows Fig.12 As shown in Figure 2, the single tooth model is Fig.13 as shown; Fig.14 and 15 As shown in the figure, when a pair of micro-drum cylindrical gears are in standard meshing, the contact line is mainly distributed in the middle of the gear teeth. The force in the middle of the gear teeth is greater, and the force at both ends of the gear teeth is smaller. This can reduce the stress concentration at the root of the gear teeth at both ends, improve the bearing capacity of the gears, and make the transmission between gears smoother. When a pair of micro-drum cylindrical gears are in non-standard meshing, they are point contact when not under force, and the force point is biased toward one end of the gear teeth. Under force, due to elastic deformation, the point contact becomes a local line contact extending from the contact point to both ends of the gear teeth. The stress in the middle part of the tooth surface is significantly greater than the stress at both ends of the tooth surface, which solves the technical problems of easy overload and pitting failure caused by existing spur gears due to problems such as axis deviation.

[0061] In order to further improve the reliability of the connection between the tool 6 and the processing rod 7, a plurality of processing grooves a are arranged at the front end of the processing disc 8, and the processing rod 7 includes a connecting portion 701, and a processing portion 702 is fixed to the end of the connecting portion 701 extending outside the processing disc 8, and the connecting portion 701 is inserted into the processing groove a, and the connecting portion 701 is fixedly connected to the processing disc 8. A connecting groove b is opened at the outer end of the processing portion 702, and the tool 6 is inserted into the connecting groove b and fixedly connected to the outer end of the processing portion 702. A first card 13 is connected to the outer side of the processing disc 8 near the processing groove a, and the first card 13 is pressed tightly on the front side of the connecting portion 701, and a second card 16 is connected to the outer side of the processing portion 702 near the connecting groove b, and the second card 16 is pressed tightly on the tool 6.

[0062] When installing the processing rod 7, use the first fixing bolt 14 to screw into the connecting part 701, insert the connecting part 701 connected with the first fixing bolt 14 into the processing groove a, so that the rear side of the connecting part 701 contacts the processing disc 8, continue to rotate the first fixing bolt 14, and the first fixing bolt 14 is screwed into the processing disc 8 to achieve a preliminary connection between the connecting part 701 and the processing disc 8, use the second fixing bolt 12 to preliminarily connect the first card 13 to the processing disc 8, continue to screw in the second fixing bolt 12, and press the first card 13 to the outside of the connecting part 701, use the third fixing bolt 15 to preliminarily connect the second card 16 to the outer end of the processing part 702, and continue to screw in the third fixing bolt 15 to press the second card 16 on the tool 6, so as to achieve the connection between the processing rod 7 and the processing disc 8 and the connection between the tool 6 and the processing rod 7.

[0063] Example 2

[0064] Reference Figure 4 and Figure 5 , which is the second embodiment of the present invention, this embodiment can further realize the adjustment of the installation angle of the processing rod.

[0065] A method for machining a micro-drum cylindrical gear using an obliquely installed machining disc 8. In order to further facilitate the adjustment of the inclination angle of a tool 6, a plurality of mounting openings c for mounting the tool 6 and connection openings d corresponding to the mounting openings c are arranged on the machining disc 8. A first connecting member 18 and a second connecting member 23 are respectively connected to the machining disc 8 at both ends of the mounting openings c. The inner end of the first connecting member 18 is connected to a first clamping block 19. The end of the second connecting member 23 extending into the corresponding mounting opening c is connected to a second clamping block 21. The first clamping block 19 and the second clamping block 21 can clamp the tool 6 at the same time. The outer end of the first connecting member 18 is threadedly connected to a first nut 17. The second connecting member 23 is threadedly connected to a second nut 22 at one end of the connection opening d. A guide opening is opened on the machining rod 7. A fastening bolt 20 is used to pass through the guide opening and connect to the machining disc 8 so that the outer end of the fastening bolt 20 is pressed against the limit step 703 of the machining rod 7.

[0066] The planes g where the ends of the first clamping block 19 and the second clamping block 21 are relatively arranged are parallel to each other. In this embodiment, the first connecting member 18 and the second connecting member 23 are preferably screws. After the inclination angle adjustment of the processing disc 8 is completed, the installation angle of the processing rod 7 is adjusted. Specifically, the plane g where the ends of the first clamping block 19 and the second clamping block 21 are relatively arranged is the clamping surface. Different clamping surfaces have different inclination angles. According to actual needs, the appropriate first clamping block 19 and the second clamping block 21 are selected, and the connecting bolt passes through the guide port and contacts the limit step 703. The processing rod 7 is inserted into the installation port c and placed between the first clamping block 19 and the second clamping block 21. The first connecting member 18 and the second connecting member 23 are screwed in so that the first clamping block 19 and the second The clamping block 21 clamps the processing rod 7, and the first clamping block 19 and the second clamping block 21 are fixedly connected to the first connecting member 18 and the second connecting member 23 respectively by using fastening screws. The inclination angle of the processing rod 7 is consistent with the inclination angle of the clamping surface. The first nut 17 and the second nut 22 are respectively screwed on the first connecting member 18 outside the processing disk 8 and the second connecting member 23 in the connecting port d. The first nut 17 and the second nut 22 are both pressed on the processing disk 8, and the fastening bolt 20 is screwed in so that the fastening bolt 20 is pressed on the limit step 703 to realize the connection between the processing rod 7 and the processing disk 8; in this design, by replacing different first clamping blocks 19 and second clamping blocks 21, the angle adjustment of the center axis of the processing rod 7 relative to the gear blank 9 is realized.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for machining a micro-drum cylindrical gear using an obliquely mounted machining disc, characterized in that: The following steps are included: Mounting the gear blank (9) to be processed on a rotating table (10); The tool (6) is mounted on the processing rod (7), and each processing rod (7) is mounted on the processing disc (8); adjusting the inclination angle of the processing disc (8) according to the amount of drum shape to be processed; The processing disc (8) rotates, and when the gear blank (9) is cut deeply, the gear blank (9) does not rotate, but only feeds. After a tool (6) completes cutting, the gear blank feeds in a direction close to the large processing disc (8) to cut out the thickness of the gear teeth. After cutting the left half tooth groove, i.e. the slightly convex tooth surface on the right side of the gear tooth, the gear blank (9) is directly subjected to a forming process; After the cutting and developing process of half of the tooth groove is completed, the gear blank (9) is retracted and indexed by 1 / Z circle, where Z is the number of teeth, and then the cutting and developing of the second half of the tooth groove is performed. When the cutting and developing process of one side of all the tooth grooves is completed, the processing disc (8) is rotated to make the other side close to the gear blank (9), and the cutting and developing process of the tooth groove on the other side of the gear is performed after the tool is aligned; During the development process, the gear blank (9) does not make a feed motion, but rotates around Z at an angular velocity ω'. C Rotate clockwise at a speed of Along X C The axis moves in the positive direction to complete the development of the slightly convex tooth surface on the right side of the gear tooth; establish the coordinate system O C X C Y C Z C , with the center of the gear blank (9) as the origin O C , origin O C The horizontal forward direction is X C Axis positive direction, origin O C The direction of horizontal extension to the right is Y C Axis positive direction, origin O C The vertical upward direction is Z C Positive direction of the axis, where m is the module and z' is the number of teeth; The drum shape of the gear blank (9) to be processed is determined according to four parameters: the gear module m, the tooth width B, the inclination angle θ of the processing disk (8), and the radius R of the processing disk (8); the inclination angle of the processing disk (8) is reversely calculated through the gear module m, the tooth width B, the trajectory radius R of the outer end vertex of the tool (6) and the required drum shape; The calculation method of the drum volume is: The conical surface formed by the blade trajectory of the tool (6) is cut to obtain the tooth line at the pitch circle on one side of the gear tooth. The tooth line equation is: The intersection point of the tooth line and the gear end face is The midpoint of line segment A1A2 is A3(x a ,0,z a ), the intersection of the tooth line and the midline of the tooth width is B(x b ,0,z b ); The drum volume is t is a parameter; A plurality of processing grooves (a) are arranged at one end of the processing disc (8) facing forward, the processing rod (7) comprises a connecting portion (701), a processing portion (702) is fixed to one end of the connecting portion (701) extending outside the processing disc (8), the connecting portion (701) is inserted into the processing groove (a), the connecting portion (701) is fixedly connected to the processing disc (8), a connecting groove (b) is formed at the outer end of the processing portion (702), the tool (6) is inserted into the connecting groove (b) and is fixedly connected to the outer end of the processing portion (702), a first card (13) is connected to the outer side of the processing disc (8) near the processing groove (a), the first card (13) is pressed against the front side of the connecting portion (701), a second card (16) is connected to the outer side of the processing portion (702) near the connecting groove (b), the second card (16) is pressed against the tool (6).

2. The method for machining a micro-drum cylindrical gear using an obliquely mounted machining disc as claimed in claim 1, characterized in that: The processing disc (8) is provided with a plurality of mounting openings (c) for mounting the tool (6) and connection openings (d) corresponding to the mounting openings (c). The processing disc (8) at both ends of the mounting openings (c) is respectively connected with a first connection member (18) and a second connection member (23). One end of the first connection member (18) extending into the corresponding mounting opening (c) is connected with a first clamping block (19), and one end of the second connection member (23) extending into the corresponding mounting opening (c) is connected with a second clamping block (21). The first clamping block (19) and the second clamping block (21) can clamp the tool (6) simultaneously.

3. The method for machining a micro-drum cylindrical gear using an obliquely mounted machining disc as claimed in claim 1, characterized in that: The processing rod (7) is provided with a guide opening, and a fastening bolt (20) is passed through the guide opening and connected to the processing disc (8), so that the pressing portion of the fastening bolt (20) is pressed against the limit step (703) of the processing rod (7).

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