阅读说明：本技术 一种叶片周向圆弧锤足型榫头加工装置及其加工方法 (Blade circumferential arc hammer foot-shaped tenon machining device and machining method thereof ) 是由 蒲双龙 陈勇 邓杰 陈蕊 朱才彬 蔡典祥 周勇 易杰 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种叶片周向圆弧锤足型榫头加工装置及其加工方法,包括用于对待加工叶片进行装夹的装夹组件以及用于对待加工叶片进行加工的刀具组件,刀具组件包括用于榫头盆背径向平面加工的螺旋齿圆柱铣刀以及用于加工叶片进排气边转接曲面的球头铣刀；通过装夹组件能够适应不同尺寸的叶片,有效的提升装夹的柔性,避免对叶片外壁的损伤,通过螺旋齿圆柱铣刀有效的解决了叶片大平面加工尺寸不稳定和表面质量差的问题,同时通过球头铣刀成型铣削大大满足了转接圆弧曲面的加工效率和尺寸精度,实现周向圆弧锤足型榫头卧加集成铣削,满足榫头尺寸精度、表面质量及加工效率要求,提高了叶片成品质量。(The invention discloses a blade circumferential arc hammer foot-shaped tenon machining device and a machining method thereof, wherein the blade circumferential arc hammer foot-shaped tenon machining device comprises a clamping assembly for clamping a blade to be machined and a cutter assembly for machining the blade to be machined, and the cutter assembly comprises a helical tooth cylindrical milling cutter for machining a radial plane of a tenon basin back and a ball end milling cutter for machining a blade air inlet and outlet edge switching curved surface; can adapt to the blade of unidimensional not through the clamping subassembly, the flexibility of effectual promotion clamping, avoid the damage to the blade outer wall, through the effectual big planar machining dimension of blade unstable and the poor problem of surface quality of having solved of helical tooth cylinder milling cutter, mill through the ball head milling cutter shaping simultaneously and mill machining efficiency and the size precision that has satisfied switching circular arc curved surface greatly, realize that circumference circular arc hammer sufficient tenon crouches and adds integrated milling, satisfy tenon size precision, surface quality and machining efficiency requirement, blade finished product quality has been improved.)

1. The blade circumferential arc hammer foot-shaped tenon machining device is characterized by comprising a clamping assembly and a cutter assembly, wherein the clamping assembly is used for clamping a blade to be machined;

the clamping assembly comprises a base and a horizontal clamping device (11) arranged on the base, wherein the horizontal clamping device (11) comprises a first positioning seat (11-3) and a second positioning seat (11-4) which are respectively in sliding fit with two sides of the base and are in an inclined structure, and a pressing piece (13) which is arranged on the first positioning seat (11-3) and the second positioning seat (11-4) and is used for pressing the upper surface of a blade to be machined; the clamping length of the blade to be processed is adapted through the sliding of the first positioning seat (11-3) and the second positioning seat (11-4);

the lower parts of the first positioning seat (11-3) and the second positioning seat (11-4) are respectively provided with a first limiting part (11-1) and a second limiting part (11-2) which are used for limiting the first positioning seat (11-3) in an angular direction, the first positioning seat (11-3) is provided with a blade body process table which is used for adapting to different widths of blades, and the second positioning seat (11-4) is provided with a blade tip process table which is used for adapting to different widths of blades.

2. The blade circumferential arc hammer foot-shaped tenon machining device according to claim 1, wherein a sliding groove (11-5) is formed in the base, the second positioning seat (11-4) is in sliding fit with the sliding groove (11-5), and a sliding position is fixed through a fixing piece (11-6) arranged on the second positioning seat (11-4).

3. The blade circumferential arc hammer foot-shaped tenon machining device according to claim 1, wherein the blade body process platform comprises a first adjusting piece (11-7) corresponding to the end part of the upper surface of the first positioning seat (11-3), a clamping cavity for clamping the blade to be machined in the width direction is formed between the first adjusting piece (11-7) and the end part of the upper surface of the first positioning seat (11-3), and the size of the clamping cavity is adjusted through length adjustment of the first adjusting piece (11-7).

4. The blade circumferential arc hammer foot-shaped tenon machining device according to claim 1, wherein the tip technological table comprises a positioning block (11-8) detachably connected to a second positioning seat (11-4) and a second adjusting piece (11-9) corresponding to the positioning block (11-8), a clamping cavity for clamping the blade to be machined in the width direction is formed between the second adjusting piece (11-9) and the positioning block (11-8), and the size of the clamping cavity is adjusted through length adjustment of the second adjusting piece (11-9) and replacement of the positioning block (11-8).

5. The blade circumferential arc hammer-foot type tenon machining device according to any one of claims 1 to 3, wherein the helical tooth cylindrical milling cutter comprises a cutter body (12-1) and a helical blade (12-2) which is arranged on the cutter body (12-1) and is of an integral structure with the cutter body (12-1);

the helical angle of the helical tooth cylindrical milling cutter is 25-35 degrees, the front angle is 2-6 degrees, the first back angle is 8-12 degrees, and the second back angle is 16-22 degrees.

6. The blade circumferential arc hammer foot type tenon machining device according to claim 5, wherein the ball-end milling cutter comprises a cutter handle (13-1) and a milling cutter head (13-2) which is coaxially arranged with the cutter handle (13-1);

the edge at the front end of the milling cutter head (13-2) is in a ball head shape, and a large arc surface (13-3) of the milling cutter head (13-2) is matched with a large arc (4-3) of the transfer curved surface (4) of the blade;

the rear end of the milling cutter head (13-2) is in a blade shape and is provided with a small straight line section (13-4) and a small circular arc (13-5), the small straight line section (13-4) is matched with a small straight line section (4-2) of the transfer curved surface (4) of the blade, and the small circular arc (13-5) is matched with a small circular arc (4-1) of the transfer curved surface (4) of the blade.

7. The blade circumferential arc hammer foot type tenon machining device according to claim 6, wherein a transition position of the rear end of the milling cutter head (13-2) and the neck part of the milling cutter head (13-1) is in a clearance groove (13-6) structure.

8. The blade circumferential arc hammer foot-shaped tenon machining device according to claim 6, wherein a helix angle of the ball end mill is 25-35 °, a rake angle is 0-4 °, a first relief angle is 10-14 °, and a second relief angle is 16-20 °.

9. A method for processing a blade circumferential arc hammer-foot-shaped tenon, which is characterized by adopting the processing device of any one of claims 1 to 8 to process and comprises the following steps:

s1: clamping a blade blank (10) with a blade body and a blade tip process platform through a first positioning seat (11-3) and a second positioning seat (11-4), wherein the front end face and the rear end face of a tenon after clamping are parallel to the direction of a plumb bob, and the back face of a basin is inclined to the horizontal plane;

s2: roughly processing and scanning the bottom surface and the periphery of the milling tenon by adopting a universal milling cutter with a circular blade, and reserving a margin of 0.5-0.7 mm;

s3: the method comprises the following steps of (1) milling a rabbet basin back radial plane 3 on the periphery of a helical tooth cylindrical milling cutter, feeding along an oblique line during milling to process a side face, wherein the rotating speed of a machine tool is 200-300 r/min, feeding is 50-100 mm/min, feeding cutting is carried out for three times, the rough machining depth is 0.4-0.5 mm, the finish machining depth is 0.1-0.2 mm, and the surface quality is improved by feeding a blank cutter once;

s4: the end faces (2) of the air inlet and outlet edges are peripherally milled by adopting a common high-speed steel spiral tooth cylindrical milling cutter;

s5: before machining, the workbench rotates 90 degrees anticlockwise or clockwise, a ball-end milling cutter is adopted to perform one-step forming milling machining on a small arc (4-1), a small section of straight line (4-2) and a large arc (4-3) of an air inlet and exhaust edge transfer curved surface, the rotating speed of a machine tool is 300-400 r/min, feeding is 50-100 mm/min, cutting by feeding twice, the rough machining depth is 0.4-0.5 mm, and the finish machining depth is 0.1-0.2 mm;

s6: and (3) keeping the position of S5 by the workbench, machining circular arc surfaces (1) of two shoulders of an air inlet and outlet edge by adopting an end mill, aligning a coordinate system after aligning the bottom surface of the tenon, and feeding along a circular arc track on an X-O-Y plane of a machine tool to finish machining.

Technical Field

The invention relates to the technical field of blade tenon machining, in particular to a blade circumferential arc hammer foot-shaped tenon machining device and a machining method thereof.

Background

As shown in figure 1, the circumferential arc hammer foot-shaped tenon blade of the gas turbine compressor is circumferentially installed in a rotor wheel groove through the root of the hammer foot shape, and is respectively in installation contact with the radial and axial limiting surfaces of the wheel groove through arcs 1 of two shoulders of the tenon and end surfaces 2 of an air inlet and outlet edge. Due to the adoption of the blade type wide chord design and the extension of the radial depth of the wheel groove, the axial and radial sizes of the tenon are increased, and a large-size basin back radial plane 3 is formed. In order to relieve stress concentration, the tenon is switched into a complex curved surface 4 formed by a small arc 4-1, a small segment of straight line 4-2 and a large arc 4-3 which rotate around the axis of the engine in the circumferential direction; in order to strictly control the shape and position errors of the tenon, the design reference and the size of the tenon are complexly upgraded, a symmetrical bisection plane 6 of a radial surface of a basin back, reference points 7 and 8 on two sides of circular arcs of two shoulders and a symmetrical bisection plane 9 of an end surface of an air inlet and exhaust edge are respectively used as a first reference, a second reference and a third reference (as shown in figure 2), and the size of the tenon is the size of the profile degree of a plane of an associated reference position; the processing difficulty of the blade circumferential arc hammer-foot-shaped tenon is that (1) the tenon is horizontally and integrally milled, the surface quality and the planeness of a large-size plane are poor, the processing efficiency of a large-diameter transfer arc curved surface is low, the surface quality and the size precision are difficult to guarantee, and the requirement on the height deviation precision of arcs at two shoulders is high.

For milling of the existing common high-speed steel spiral tooth cylindrical milling cutter on a large-size plane, the long overhanging cutter has poor rigidity, large cutter relieving deformation, easy abrasion of the cutter and quick loss of the straightness accuracy of a cutting edge, so that the surface quality is poor and the surface gradient is large;

the large-diameter complex transfer curved surface is milled in a layering mode by using a small-diameter ball-end milling cutter, so that the processing efficiency is low, the surface quality and the dimensional precision are difficult to meet the requirements, and the large-diameter complex transfer curved surface is difficult to grind due to the limitation of the size of a cutter; the disc-shaped forming milling cutter cannot be used in the space of the tenon groove limited by the space, so that the processing difficulty is high and the efficiency is low.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a blade circumferential arc hammer foot-shaped tenon machining device and a machining method thereof.

The technical scheme for solving the technical problems is as follows: a blade circumferential arc hammer foot-shaped tenon machining device comprises a clamping assembly and a cutter assembly, wherein the clamping assembly is used for clamping a blade to be machined, the cutter assembly is used for machining the blade to be machined, and the cutter assembly comprises a helical tooth cylindrical milling cutter and a ball end milling cutter, the helical tooth cylindrical milling cutter is used for machining a radial plane of a tenon basin back, and the ball end milling cutter is used for machining a blade air inlet and outlet edge switching curved surface;

the clamping assembly comprises a base and a horizontal clamping device arranged on the base, wherein the horizontal clamping device comprises a first positioning seat and a second positioning seat which are respectively in sliding fit with two sides of the base and are in an inclined structure, and a pressing piece which is arranged on the first positioning seat and the second positioning seat and is used for pressing the upper surface of the blade to be processed; the clamping length of the blade to be machined is adapted through sliding of the first positioning seat and the second positioning seat;

the lower sides of the first positioning seat and the second positioning seat are respectively provided with a first limiting part and a second limiting part which are used for limiting the angle direction of the first positioning seat, the first positioning seat is provided with a blade body process table which is used for adapting to different widths of blades, and the second positioning seat is provided with a blade tip process table which is used for adapting to different widths of blades.

Furthermore, a sliding groove is formed in the base, the second positioning seat is in sliding fit with the sliding groove, and the sliding position is fixed through a fixing piece arranged on the second positioning seat.

Further, the blade body process platform comprises a first adjusting piece corresponding to the end part of the upper surface of the first positioning seat, a clamping cavity used for clamping the blade to be machined in the width direction is formed between the first adjusting piece and the end part of the upper surface of the first positioning seat, and the size of the clamping cavity is adjusted through length adjustment of the first adjusting piece.

Further, the tip technology platform comprises a positioning block detachably connected to the second positioning seat and a second adjusting piece corresponding to the positioning block, a clamping cavity used for clamping the blade to be machined in the width direction is formed between the second adjusting piece and the positioning block, and the size of the clamping cavity is adjusted by adjusting the length of the second adjusting piece and replacing the positioning block.

Further, the helical tooth cylindrical milling cutter comprises a cutter body and a helical blade arranged on the cutter body;

the helical angle of the helical tooth cylindrical milling cutter is 25-35 degrees, the front angle is 2-6 degrees, the first back angle is 8-12 degrees, and the second back angle is 16-22 degrees.

Further, the ball-end milling cutter comprises a cutter handle and a milling cutter head which is coaxial with the cutter handle;

the edge at the front end of the milling cutter head is in a ball head shape, and the large arc surface of the milling cutter head is matched with the large arc of the transfer curved surface of the blade;

the rear end of the milling cutter head is in a blade shape and is provided with a small straight line section and a small circular arc, the small straight line section is matched with a small straight line section of the transfer curved surface of the blade, and the small circular arc is matched with a small circular arc of the transfer curved surface of the blade.

Further, the switching position of the rear end of the milling cutter head and the neck part is an empty cutter groove structure.

Further, the helix angle of the ball end mill is 25-35 degrees, the front angle is 0-4 degrees, the first back angle is 10-14 degrees, and the second back angle is 16-20 degrees.

The invention also provides a method for processing the circumferential arc hammer foot-shaped tenon of the blade, which comprises the following steps:

s1: clamping a blade blank with a blade body and a blade tip process platform through a first positioning seat and a second positioning seat, wherein the front end face and the rear end face of a clamped tenon are parallel to the direction of a plumb bob, and the back face of a basin is inclined to the horizontal plane;

s2: roughly processing and scanning the bottom surface and the periphery of the milling tenon by adopting a universal milling cutter with a circular blade, and reserving a margin of 0.5-0.7 mm;

s3: the method comprises the following steps of (1) milling a rabbet basin back radial plane 3 on the periphery of a helical tooth cylindrical milling cutter, feeding along an oblique line during milling to process a side face, wherein the rotating speed of a machine tool is 200-300 r/min, feeding is 50-100 mm/min, feeding cutting is carried out for three times, the rough machining depth is 0.4-0.5 mm, the finish machining depth is 0.1-0.2 mm, and the surface quality is improved by feeding a blank cutter once;

s4: the end faces of the air inlet and outlet edges are peripherally milled by adopting a common high-speed steel spiral tooth cylindrical milling cutter;

s5: before machining, the workbench rotates 90 degrees anticlockwise or clockwise, a ball end milling cutter 13 is adopted to perform one-step forming and milling machining on a small arc, a small segment of straight line and a large arc of an air inlet and exhaust edge transfer curved surface, the rotating speed of a machine tool is 300-400 r/min, feeding is 50-100 mm/min, cutting is performed by feeding twice, the rough machining cutting depth is 0.4-0.5 mm, and the finish machining cutting depth is 0.1-0.2 mm;

s6: and (4) keeping the position of S5 by the workbench, machining arc surfaces of two shoulders of an air inlet and outlet edge by using an end mill, aligning a coordinate system after aligning the bottom surface of the tenon, and feeding along an arc track on an X-O-Y plane of the machine tool to finish machining.

The invention has the following beneficial effects: according to the blade circumferential arc hammer foot-shaped tenon machining device and the machining method thereof, provided by the invention, the clamping assembly can adapt to blades of different sizes, the clamping flexibility is effectively improved, the damage to the outer wall of the blade is avoided, the problems of unstable machining size and poor surface quality of a large plane of the blade are effectively solved through the helical tooth cylindrical milling cutter, meanwhile, the machining efficiency and the dimensional precision of a transfer arc curved surface are greatly met through the ball-end milling cutter forming milling, the horizontal and integrated milling of the circumferential arc hammer foot-shaped tenon is realized, the requirements of the size precision, the surface quality and the machining efficiency of the tenon are met, and the finished product quality of the blade is improved.

Drawings

FIG. 1 is a schematic view of a blade circumferential arc hammer foot-shaped tenon according to the present invention;

FIG. 2 is a schematic diagram of a design reference of a circumferential arc hammer foot-shaped tenon of a blade according to the invention;

FIG. 3 is a schematic view of clamping a circumferential arc hammer-foot-shaped tenon of the blade according to the invention;

FIG. 4 is a schematic view of the clamping assembly of the present invention;

FIG. 5 is a schematic view of the helical tooth cylindrical milling cutter of the present invention;

FIG. 6 is a schematic view of the first and second relief angles of the helical tooth cylindrical mill of the present invention;

FIG. 7 is a schematic view of a ball end mill according to the present invention;

fig. 8 is a schematic view of the configuration of the first and second clearance angles of the ball nose mill of the present invention.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the processed blade circumferential arc hammer foot-shaped tenon is made of stainless steel, the maximum width of a radial surface 3 of a basin back of the tenon is 95-154 mm, and the flatness requirement is 0.1 mm; the transfer curved surface 4 is formed by circumferentially revolving around the axis of the engine around a small arc 4-1 with the radius R3.5mm, a small segment of straight line 4-2 and a large arc 4-3 with the radius R18-25.4 mm; the profile tolerance of the two-shoulder arc 1 is 0.05mm, and the height deviation of the reference points 7 and 8 is less than 0.02 mm; the design references respectively use a symmetrical bisection plane 6 of a radial surface 4 of the basin back, reference points 7 and 8 on two sides of the circular arc 1 of the two shoulders and a symmetrical bisection plane 9 of the end surface 3 of the air inlet and exhaust edge as a first reference, a second reference and a third reference, the design references are mutually related, and the size of the tenon is complexly upgraded.

In view of the above problems, as shown in fig. 3 to 4, the invention provides a blade circumferential arc hammer foot-shaped tenon machining device, which comprises a clamping assembly for clamping a blade to be machined and a cutter assembly for machining the blade to be machined, wherein the cutter assembly comprises a helical tooth cylindrical milling cutter for machining a radial plane of a tenon basin back and a ball end milling cutter for machining a blade air inlet and exhaust edge switching curved surface. The whole clamping assembly is an adjustable horizontal clamping device, can be adjusted according to different sizes of the blades, and improves the clamping flexibility. The helical tooth cylindrical milling cutter solves the problems of unstable machining size and poor surface quality of a large plane of the blade, and the ball head milling cutter is formed and milled to meet the machining efficiency and the dimensional precision of the transfer arc curved surface.

The clamping assembly comprises a base and a horizontal clamping device 11 arranged on the base, wherein the horizontal clamping device 11 comprises a first positioning seat 11-3 and a second positioning seat 11-4 which are respectively in sliding fit with two sides of the base and are in an inclined structure, and a pressing piece 13 which is arranged on the first positioning seat 11-3 and the second positioning seat 11-4 and is used for pressing the upper surface of a blade to be machined; the pressing piece 13 is a pressing cover and a screw rod connected with the pressing cover, and the pressing cover is driven to be pressed on the surface of the blade through the rotation of the screw rod. The clamping length of the blade to be processed is adapted through sliding of the first positioning seat 11-3 and the second positioning seat 11-4; the inclination angles of the first positioning seat 11-3 and the second positioning seat 11-4 can be set to 23 degrees, 24 degrees and 25 degrees.

A first limiting part 11-1 and a second limiting part 11-2 for angularly limiting the first positioning seat 11-3 are respectively arranged below the first positioning seat 11-3 and the second positioning seat 11-4, a blade body process table for adapting to different widths of the blade is arranged on the first positioning seat 11-3, and a blade tip process table for adapting to different widths of the blade is arranged on the second positioning seat 11-4. The first limiting part 11-1 and the second limiting part 11-2 adopt limiting bolts, and the limiting bolts are abutted against the lower part of the positioning seat to change the inclination angle of the positioning seat.

The base is provided with a sliding groove 11-5, the first positioning seat 11-3 is fixed on the base, the second positioning seat 11-4 is in sliding fit with the sliding groove 11-5, and the sliding position is fixed through a fixing piece 11-6 arranged on the second positioning seat. The sliding groove is of a T-shaped structure, and the distance between the first positioning seat 11-3 and the second positioning seat 11-4 can be adjusted conveniently through the sliding groove, so that the blade positioning device is suitable for blades with different lengths.

The blade body process platform comprises a first adjusting piece 11-7 corresponding to the end part of the upper surface of a first positioning seat 11-3, a clamping cavity for clamping the blade to be machined in the width direction is formed between the first adjusting piece 11-7 and the end part of the upper surface of the first positioning seat 11-3, and the size of the clamping cavity is adjusted through length adjustment of the first adjusting piece 11-7. The first adjusting piece adopts an adjusting screw, and the size of the clamping cavity can be adjusted through the adjusting screw, so that blade bodies of different widths of the blades are met.

The blade tip process table comprises a positioning block 11-8 detachably connected to a second positioning seat 11-4 and a second adjusting piece 11-9 corresponding to the positioning block 11-8, a clamping cavity for clamping the blade to be machined in the width direction is formed between the second adjusting piece 11-9 and the positioning block 11-8, and the size of the clamping cavity is adjusted through length adjustment of the second adjusting piece 11-9 and replacement of the positioning block 11-8.

As shown in fig. 5 to 6, the helical tooth cylindrical milling cutter includes a cutter body 12-1 and a helical insert 12-2 provided in the cutter body 12-1; the helical blade 12-2 is welded on the cutter body 12-1, or the helical blade 12-2 and the cutter body 12-1 are integrally formed. The blade is made of hard alloy, the spiral angle of the spiral tooth cylindrical milling cutter is 25-35 degrees, the front angle is 2-6 degrees, the first back angle is 8-12 degrees, and the second back angle is 16-22 degrees.

As shown in fig. 7 to 8, the ball nose milling cutter includes a shank 13-1 and a milling cutter head 13-2 disposed coaxially with the shank 13-1; the edge at the front end of the milling cutter head 13-2 is in a ball head shape, and the large arc surface 13-3 of the milling cutter head 13-2 is matched with the large arc 4-3 of the transfer curved surface 4 of the blade; the rear end of the milling cutter head 13-2 is in the shape of a blade comprising a small straight line section 13-4 and a small arc 13-5, the small straight line section 13-4 is matched with a small straight line section 4-2 of the transfer curved surface 4 of the blade, and the small arc 13-5 is matched with a small arc 4-1 of the transfer curved surface 4 of the blade. The switching position of the rear end of the milling cutter head 13-2 and the neck part of the milling cutter head 13-1 is of an empty cutter groove 13-6 structure. The cutter material is tungsten steel K40UF, and the sword tooth number is 6, and ball end mill's helix angle is 25 ~ 35, and the anterior angle is 0 ~ 4, and first relief angle is 10 ~ 14, and the second relief angle is 16 ~ 20.

The first embodiment is as follows:

the invention also provides a method for processing the circumferential arc hammer foot-shaped tenon of the blade, which comprises the following steps:

s1: clamping a blade blank 10 with a blade body and a blade tip process platform through a first positioning seat 11-3 and a second positioning seat 11-4, wherein the front end face and the rear end face of a clamped tenon are parallel to the direction of a plumb bob, and the back face of a basin is inclined to the horizontal plane; the inclination angle of the first positioning seat 11-3 and the second positioning seat 11-4 is 23 degrees;

s2: roughly processing and scanning the bottom surface and the periphery of the milling tenon by adopting a universal milling cutter with a circular blade, and reserving a margin of 0.5-0.7 mm;

s3: the method comprises the following steps of (1) milling a rabbet basin back radial plane 3 on the periphery of a helical tooth cylindrical milling cutter, feeding along an oblique line during milling to process a side face, wherein the rotating speed of a machine tool is 200-300 r/min, feeding is 50-100 mm/min, feeding cutting is carried out for three times, the rough machining depth is 0.4-0.5 mm, the finish machining depth is 0.1-0.2 mm, and the surface quality is improved by feeding a blank cutter once; the helical tooth cylindrical milling cutter has the cutter teeth number of 6, the helix angle of 25 degrees, the rake angle of 6 degrees, the first relief angle of 12 degrees, the second relief angle of 22 degrees, the blade diameter of 42mm, the core thickness of 32mm, the cutter length of 250mm and the blade length of 160 mm.

S4: the end face 2 of the air inlet and outlet edge is peripherally milled by adopting a common high-speed steel spiral tooth cylindrical milling cutter;

s5: before machining, the workbench rotates 90 degrees anticlockwise or clockwise, a ball end milling cutter is adopted to perform one-step forming milling machining on a small arc 4-1, a small section of straight line 4-2 and a large arc 4-3 of an air inlet and exhaust edge transfer curved surface, the rotating speed of a machine tool is 300-400 r/min, feeding is 50-100 mm/min, cutting is performed by two times of feed, the rough machining depth is 0.4-0.5 mm, and the finish machining depth is 0.1-0.2 mm; the ball end mill has the advantages that the number of cutter teeth is 6, the helix angle is 25 degrees, the front angle is 0 degree, the first rear angle is 10 degrees, and the second rear angle is 16 degrees;

s6: and (4) keeping the position of S5 by the workbench, machining arc surfaces 1 of two shoulders of an air inlet and outlet edge by using an end mill, aligning a coordinate system after aligning the bottom surface of the tenon, and feeding along an arc track on an X-O-Y plane of a machine tool to finish machining.

Example two:

the invention also provides a method for processing the circumferential arc hammer foot-shaped tenon of the blade, which comprises the following steps:

s1: clamping a blade blank 10 with a blade body and a blade tip process platform through a first positioning seat 11-3 and a second positioning seat 11-4, wherein the front end face and the rear end face of a clamped tenon are parallel to the direction of a plumb bob, and the back face of a basin is inclined to the horizontal plane; the inclination angle of the first positioning seat 11-3 and the second positioning seat 11-4 is 25 degrees;

s2: roughly processing and scanning the bottom surface and the periphery of the milling tenon by adopting a universal milling cutter with a circular blade, and reserving a margin of 0.5-0.7 mm;

s3: the method comprises the following steps of (1) milling a rabbet basin back radial plane 3 on the periphery of a helical tooth cylindrical milling cutter, feeding along an oblique line during milling to process a side face, wherein the rotating speed of a machine tool is 200-300 r/min, feeding is 50-100 mm/min, feeding cutting is carried out for three times, the rough machining depth is 0.4-0.5 mm, the finish machining depth is 0.1-0.2 mm, and the surface quality is improved by feeding a blank cutter once; the spiral tooth cylindrical milling cutter has the cutter teeth number of 6, the spiral angle of 25 degrees, the front angle of 2 degrees, the first back angle of 8 degrees, the second back angle of 16 degrees, the blade diameter of 42mm, the core thickness of 32mm, the cutter length of 160mm and the blade length of 80 mm.

S4: the end face 2 of the air inlet and outlet edge is peripherally milled by adopting a common high-speed steel spiral tooth cylindrical milling cutter;

s5: before machining, the workbench rotates 90 degrees anticlockwise or clockwise, a ball end milling cutter is adopted to perform one-step forming milling machining on a small arc 4-1, a small section of straight line 4-2 and a large arc 4-3 of an air inlet and exhaust edge transfer curved surface, the rotating speed of a machine tool is 300-400 r/min, feeding is 50-100 mm/min, cutting is performed by two times of feed, the rough machining depth is 0.4-0.5 mm, and the finish machining depth is 0.1-0.2 mm; the ball end mill has the advantages that the number of cutter teeth is 6, the spiral angle is 25 degrees, the front angle is 4 degrees, the first rear angle is 14 degrees, and the second rear angle is 20 degrees;

s6: and (4) keeping the position of S5 by the workbench, machining arc surfaces 1 of two shoulders of an air inlet and outlet edge by using an end mill, aligning a coordinate system after aligning the bottom surface of the tenon, and feeding along an arc track on an X-O-Y plane of a machine tool to finish machining.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.