CN118650188A - Channel steel groove milling system and method - Google Patents

Abstract

The application relates to a channel steel groove milling system, which comprises: the tooling comprises a tooling bottom plate, wherein the tooling bottom plate is fixedly provided with a tooling back plate, the tooling back plate divides the tooling bottom plate into a first area and a second area, a plurality of groups of clamping assemblies are arranged in the first area, the clamping assemblies are arranged side by side, the clamping ends of each group of clamping assemblies extend forwards into the second area, and the second area is used for holding channel steel; the combined milling cutter comprises a rod body, and a first blade group and a second blade group which are fixed on the rod body, wherein two first blades of the first blade group are positioned on the same horizontal plane, and two second blades of the second blade group are positioned on the same horizontal plane and below the first blade group. The traditional repeated clamping can be changed into one-time clamping, so that the labor intensity is reduced, and the auxiliary time is shortened; the traditional two times of feeding is changed into one time of feeding, and the processing quality and efficiency of the channel steel welding groove are improved.

Description

Channel steel groove milling system and method

Technical Field

The application relates to the field of metal cutting machining, in particular to a channel steel groove milling system and method.

Background

A metal cutting process is a process in which a workpiece and a tool interact. The cutter cuts redundant metal from the workpiece to be processed, and on the premise of controlling the production rate and the cost, the workpiece is enabled to obtain geometric precision, dimensional precision and surface quality which meet the design and process requirements. To achieve this, there is a relative movement, i.e. a cutting movement, between the workpiece and the tool, which is provided by a metal cutting machine. The machine tool, the clamp, the tool and the workpiece form a machining process system. Various phenomena and laws of the metal cutting process will be studied in the state of motion of this system.

In the related art, the channel steel parts which are formed by metal plates but have not processed side profiles and grooves usually need to be clamped for multiple times, and the common chamfering cutters are used for chamfering edges respectively, so that the defect of non-uniform reference exists.

Disclosure of Invention

The application provides a channel steel groove milling system and a channel steel groove milling method, which can change the traditional repeated clamping into one-time clamping, thereby reducing the labor intensity and the auxiliary time; the traditional two times of feeding is changed into one time of feeding, and the processing quality and efficiency of the channel steel welding groove are improved.

In a first aspect, an embodiment of the present application provides a channel groove milling system, including:

the tooling comprises a tooling bottom plate, wherein the tooling bottom plate is fixedly provided with a tooling back plate, the tooling back plate divides the tooling bottom plate into a first area and a second area, a plurality of groups of clamping assemblies are arranged in the first area, the clamping assemblies are arranged side by side, the clamping ends of each group of clamping assemblies extend forwards into the second area, and the second area is used for holding channel steel;

the combined milling cutter comprises a rod body, and a first blade group and a second blade group which are fixed on the rod body, wherein two first blades of the first blade group are positioned on the same horizontal plane, and two second blades of the second blade group are positioned on the same horizontal plane and below the first blade group.

With reference to the first aspect, in one embodiment, the clamping assembly includes:

The first threaded rod, one end of first threaded rod is put in the frock bottom plate to be located first region, the other end threaded connection of first threaded rod has the clamp plate, the one end of clamp plate rotatable and stretch out to in the second region.

With reference to the first aspect, in one implementation manner, a strip-shaped hole is formed in the middle of the pressing plate, and a plurality of first threaded holes are formed in the part, located in the first area, of the tool bottom plate;

the clamping assembly further comprises:

and one end of the second threaded rod penetrates through the strip-shaped hole and is in threaded connection with the first threaded hole.

With reference to the first aspect, in one embodiment, a plurality of second threaded holes are provided in the first region, and each of the first threaded holes is located between two of the second threaded holes.

With reference to the first aspect, in one embodiment, the channel groove milling system further includes a plurality of spacers, and a plurality of the spacers are disposed in the second area.

With reference to the first aspect, in one embodiment, the channel groove milling system further includes a plurality of adjustable support assemblies for being disposed within the channel.

With reference to the first aspect, in one embodiment, the channel groove milling system further includes two locating pins, and the locating pins are fixed to the bottom surface of the tooling bottom plate.

With reference to the first aspect, in one embodiment, the rod body includes a main rod and an auxiliary rod, the opposite sides of the main rod are provided with first grooves, the first blades are installed in the corresponding first grooves, the opposite sides of the auxiliary rod are provided with second grooves, and the second blades are installed in the corresponding second grooves;

The end face of the bottom end of the main rod is provided with a third threaded hole, the end face of the top end of the auxiliary rod is fixedly provided with a third threaded rod, the outer wall of the third threaded rod is in threaded connection with at least one locking nut, the outer wall of the third threaded rod is sleeved with a gasket, and the gasket is located above the locking nut.

With reference to the first aspect, in one embodiment, the two second blades are asymmetrically distributed, and an included angle between the first second blade and the second blade is 195 degrees in a clockwise direction.

In a second aspect, an embodiment of the present application provides a channel groove milling method, including the following steps:

Placing the channel steel in the second area, backing the channel steel against the tool backboard, and fixing the channel steel in the second area of the tool backboard by using a plurality of groups of clamping assemblies;

Aligning a first blade group of the combined milling cutter with a groove of a first layer of the channel steel, and aligning a second blade group with a groove of a second layer of the channel steel;

and starting the machine tool to work to drive the combined milling cutter to rotate, and finishing milling of grooves of the first layer and the second layer of the channel steel.

The technical scheme provided by the embodiment of the application has the beneficial effects that:

the channel steel is placed in the second area and is backed against the tool backboard, the clamping ends of the clamping assemblies extend into the second area, the channel steel can be fixed in the second area of the tool backboard by utilizing the plurality of groups of clamping assemblies, and then the combined milling cutter is utilized, so that grooves on two sides of the channel steel can be machined simultaneously due to the fact that the first blades of the first blade group and the second blades of the second blade group are vertically distributed. In one-time clamping, all grooves on two sides of the channel steel are machined in one-time feeding by using a combined milling cutter, so that the traditional multiple-time clamping is changed into one-time clamping, the labor intensity is reduced, and the auxiliary time is shortened; the traditional two times of feeding is changed into one time of feeding, and the processing quality and efficiency of the channel steel welding groove are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a front view structure of a tooling bottom plate;

FIG. 2 is a schematic top view of a tooling bottom plate;

FIG. 3 is a schematic side view of a tooling bottom plate;

FIG. 4 is a schematic perspective view of a gang tool;

FIG. 5 is a schematic view of a sectional front view of a combination milling cutter

Fig. 6 is a schematic diagram of a front view structure of the boom;

FIG. 7 is a schematic view of the front view of the auxiliary lever;

FIG. 8 is a schematic top view of two first blades;

fig. 9 is a schematic top view of two second blades.

In the figure: 1. a tool bottom plate; 101. a first region; 102. a second region; 103. a second threaded hole; 2. a tool backboard; 3. a clamping assembly; 301. a first threaded rod; 302. a pressing plate; 303. a bar-shaped hole; 304. a second threaded rod; 4. channel steel; 5. a combination milling cutter; 501. a rod body; 5011. a main rod; 5012. an auxiliary rod; 502. a first blade set; 503. a second blade set; 504. a first groove; 505. a second groove; 506. a third threaded hole; 507. a third threaded rod; 508. a lock nut; 509. a gasket; 6. a cushion block; 7. an adjustable support assembly; 8. and (5) positioning pins.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a channel steel groove milling system and a channel steel groove milling method, which can change the traditional repeated clamping into one-time clamping, thereby reducing the labor intensity and the auxiliary time; the traditional two times of feeding is changed into one time of feeding, and the processing quality and efficiency of the channel steel welding groove are improved.

In a first aspect, as shown in fig. 1, 2 and 3, an embodiment of the present application provides a channel groove milling system, which may include: the tooling bottom plate 1 is fixedly provided with a tooling bottom plate 2, the tooling bottom plate 1 is divided into a first area 101 and a second area 102 by the tooling bottom plate 2, a plurality of groups of clamping assemblies 3 are arranged in the first area 101, the plurality of groups of clamping assemblies 3 are arranged side by side, the clamping end of each group of clamping assemblies 3 extends forward into the second area 102, and the second area 102 is used for holding channel steel 4; the gang milling cutter 5, the gang milling cutter 5 includes a rod body 501, and a first blade group 502 and a second blade group 503 fixed to the rod body 501, wherein two first blades of the first blade group 502 are located at the same horizontal plane, and two second blades of the second blade group 503 are located at the same horizontal plane and below the first blade group 502.

The length direction of the tooling bottom plate 1 is extended along the left-right direction, the tooling back plate 2 is fixed at the middle of the tooling bottom plate 1 along the left-right direction, the tooling back plate 2 divides the tooling bottom plate 1 into a first area 101 and a second area 102 along the front-back direction, the first area 101 is used for accommodating a plurality of clamping assemblies 3, the clamping assemblies 3 are distributed at intervals along the left-right direction, and the clamping ends of the clamping assemblies 3 extend into the second area 102 to jointly clamp and fix the channel steel 4 in the second area 102. The gang mill 5 includes a first blade group 502 and a second blade group 503, and the first blades of the first blade group 502 and the second blades of the second blade group 503 are distributed at intervals along the up-down direction, and the interval distance is adapted to the groove distance of the upper layer and the lower layer of the channel steel 4.

Specifically, the channel steel 4 is placed in the second area 102 and is supported against the tooling backboard 2, and because the clamping end of the clamping assembly 3 extends forward into the second area 102, the channel steel 4 can be fixed in the second area 102 of the tooling backboard 1 by utilizing the plurality of groups of clamping assemblies 3, and then the two grooves on the two sides of the channel steel 4 can be simultaneously processed by utilizing the combination milling cutter 5 due to the vertical distribution of the first blade group 502 and the second blade group 503. In one-time clamping, all grooves on two sides of the channel steel 4 are machined in one-time feeding by using the combined milling cutter 5, so that the traditional multiple-time clamping is changed into one-time clamping, the labor intensity is reduced, and the auxiliary time is shortened; the traditional two times of feeding is changed into one time of feeding, so that the processing quality and efficiency of the welding groove of the channel steel 4 are improved.

With reference to the first aspect, in one embodiment, as shown in fig. 1,2 and 3, the clamping assembly 3 may include: the first threaded rod 301, one end of the first threaded rod 301 is placed on the tool bottom plate 1 and is located in the first area 101, the other end of the first threaded rod 301 is in threaded connection with a pressing plate 302, and one end of the pressing plate 302 can rotate and extend out into the second area 102. Illustratively, the pressing plate 302 is rotated, so that the height of the pressing plate 302 is changed, and when the other end of the pressing plate 302 rotates and extends out of the second area 102 and abuts against the top surface of the channel steel 4, the channel steel 4 can be limited and fixed.

With reference to the first aspect, in one embodiment, as shown in fig. 1,2 and 3, a strip hole 303 is formed in the middle of the pressing plate 302, and a plurality of first threaded holes are formed in a portion of the tooling bottom plate 1 located in the first area 101; the clamping assembly 3 further comprises: and one end of the second threaded rod 304 penetrates through the strip-shaped hole 303 and is in threaded connection with the first threaded hole. The second threaded rod 304 is in threaded connection with the first threaded hole in the first area 101 and penetrates through the strip-shaped hole 303, so that the pressing plate 302 can be pressed downwards, and the limiting and fixing effect of the pressing plate 302 on the channel steel 4 can be improved.

In combination with the first aspect, in one embodiment, as shown in fig. 1, 2 and 3, a plurality of second threaded holes 103 are provided in the first region 101, each of the first threaded holes being located between two of the second threaded holes 103. For example, the second threaded holes 103 are formed at positions near the second threaded rod 304 along the left-right direction, and the inconsistent specifications of the channel steel may cause the rotation angle of the other end of the pressing plate 302 to be too far left or far right, so that the first threaded holes cannot meet the threaded connection of the second threaded rod 304, and the added second threaded holes 103 can meet the distance deviation.

In combination with the first aspect, in one embodiment, as shown in fig. 1 and 3, the channel groove milling system further includes a plurality of spacers 6, and a plurality of spacers 6 are disposed in the second area 102. The bottom of the channel steel 4 can be supported through cushion blocks 6 with different heights, and the channel steel 4 with different height specifications can be met to adapt to the tooling backboard 2.

In combination with the first aspect, in one embodiment, as shown in fig. 1 and 3, the channel groove milling system further includes a plurality of adjustable support assemblies 7, wherein the adjustable support assemblies 7 are configured to be disposed within the channel 4. Illustratively, the plurality of adjustable supporting components 7 are distributed at intervals along the length direction of the channel steel 4 and correspondingly arranged under the pressing plate 302, and can play a role in supporting and reinforcing the channel steel 4 through the adjustable supporting components 7, so that the channel steel 4 is deformed and the processing quality of the channel steel 4 is affected when the pressing plate 302 is prevented from being clamped and fixed.

In combination with the first aspect, in one embodiment, the adjustable support assembly 7 includes a nut and a screw threaded into the nut, and turning the screw adjusts the length of extension to provide support reinforcement to the channel 4.

In combination with the first aspect, in one embodiment, as shown in fig. 1 and 3, the channel groove milling system further includes two locating pins 8, and the locating pins 8 are fixed to the bottom surface of the tooling bottom plate 1. The locating pin 8 can limit and fix the tool bottom plate 1 on the workbench surface, limit the tool bottom plate 1, and facilitate subsequent convenient use.

In combination with the first aspect, in one embodiment, as shown in fig. 4 and 5, the lever 501 includes a main lever 5011 and a secondary lever 5012, wherein first grooves 504 are formed on opposite sides of the main lever 5011, the first blades are mounted in the corresponding first grooves 504, second grooves 505 are formed on opposite sides of the secondary lever 5012, and the second blades are mounted in the corresponding second grooves 505; the bottom end face of the main rod 5011 is provided with a third threaded hole 506, the top end face of the auxiliary rod 5012 is fixed with a third threaded rod 507, the outer wall of the third threaded rod 507 is in threaded connection with at least one lock nut 508, the outer wall of the third threaded rod 507 is sleeved with a gasket 509, and the gasket 509 is located above the lock nut 508. Illustratively, the gang mill 5 includes two first inserts, two second inserts, a lock nut 508, and a washer 509. A washer 509 of an appropriate thickness should be selected first according to the opening width of the channel 4 to be processed. The washer 509 can be used to both protect the primary lever 5011 and to adjust the spacing of the two sets of blade sets (first and second blades) of the primary lever 5011 and the secondary lever 5012. Next, the main lever 5011 and the sub lever 5012 are locked by the third threaded rod 507 using a plurality of lock nuts 508. On the premise of meeting the use requirement, the shorter the exposed part of the thread of the third threaded rod 507 is, the better the overall rigidity of the cutter is, and the better the vibration-proof effect is.

In combination with the first aspect, in one embodiment, as shown in fig. 6, the top-stop profile arcs a and c and the middle portion of the side wall of the mounting surface of the first groove 504 are straight lines b, and the whole side wall d is provided with a draft angle, so that the processing of the blade mounting groove and the corner clearance counter bore thereof is facilitated.

In combination with the first aspect, in one embodiment, as shown in fig. 7, the starting and stopping contour arcs a 'and c' of the side wall of the mounting surface of the second groove 505 are straight lines b 'in the middle, and the whole side wall d' is provided with a draft angle, so that the processing of the blade mounting groove and the corner clearance counter bore thereof is facilitated.

In combination with the first aspect, in one embodiment, as shown in fig. 8, the two first blades are distributed in a central symmetry.

In combination with the first aspect, in an embodiment, as shown in fig. 9, the two second blades are asymmetrically distributed, and an included angle between the first second blade and the second blade is 195 degrees in a clockwise direction. The purpose is to destroy the periodic vibration occurring with the first blade in the cutting process and avoid generating larger amplitude in the cutting process.

In a second aspect, an embodiment of the present application provides a channel groove milling method, including the following steps:

Step one: placing the channel steel 4 in the second area 102, backing the channel steel 4 against the tooling backboard 2, and fixing the channel steel 4 in the second area 102 of the tooling backboard 1 by using a plurality of groups of clamping assemblies 3;

Step two: aligning a first blade set 502 of the combination milling cutter 5 with a groove of a first layer of the channel steel 4, and aligning a second blade set 503 with a groove of a second layer of the channel steel 4;

step three: and starting the machine tool to work to drive the combined milling cutter 5 to rotate, and finishing milling of grooves of the first layer and the second layer of the channel steel 4.

Specifically, the channel steel 4 is placed in the second area 102 and is backed against the tooling backboard 2, and as the clamping ends of the clamping assemblies 3 extend forward into the second area 102, the channel steel 4 can be fixed in the second area 102 of the tooling backboard 1 by utilizing the plurality of groups of clamping assemblies 3, and then the combined milling cutter 5 is utilized, so that grooves on two sides of the channel steel 4 can be machined simultaneously due to the fact that the first blades and the second blades are distributed vertically. In one-time clamping, all grooves on two sides of the channel steel 4 are machined in one-time feeding by using the combined milling cutter 5, so that the traditional multiple-time clamping is changed into one-time clamping, the labor intensity is reduced, and the auxiliary time is shortened; the traditional two times of feeding is changed into one time of feeding, so that the processing quality and efficiency of the welding groove of the channel steel 4 are improved.

The tool bottom plate 1, the tool back plate 2 and the clamping assembly are used for clamping, a plurality of adjustable supporting assemblies 7 are placed in the U-shaped groove cavity of the channel steel 4in advance, and in a pressing state, a plurality of lacing wires are added in the workpiece, so that the rigidity of the workpiece is enhanced. The asymmetrically distributed second insert reduces vibrations of the process system during milling, substantially eliminating self-excited vibrations. In one clamping, all machining contents are finished: the contour adopts a layer cutting method, and all grooves are processed in one feed. The processing sequence is primary and secondary, from top to bottom, from outside to inside. The axial distance between the first blade of the main rod 5011 and the second blade of the auxiliary rod 5012 is adjusted according to the U-shaped specification of the processed channel steel 4 by selecting a gasket 509 with corresponding thickness; the size of the machined groove is realized by axially and radially translating the combined milling cutter 5 and changing the relative contact position between the side edges of the two groups of blades and the edge of the channel steel 4.

In combination, by utilizing the tooling (the tooling bottom plate 1, the tooling back plate 2 and the clamping assembly) and the combined milling cutter 5, the milling processing of the welding groove of the U-shaped end face and the side surface outline of the channel steel 4 can be efficiently completed in one-time clamping, the processing quality and efficiency of the welding groove of various channel steels 4 are reliably improved, and the applicable channel steel 4 has more varieties and specifications and good application prospect and comprehensive benefit. The multiple clamping is changed into one clamping, so that the labor intensity is reduced, and the auxiliary time is shortened; the upper and lower two times of feeding are changed into one time of feeding, so that the processing efficiency is improved; the adjustable composite chamfer combined milling cutter 5 has low cost, simplicity, practicability, good vibration reduction effect and long service life.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A channel groove milling system, comprising:

The fixture comprises a fixture bottom plate (1), wherein the fixture bottom plate (1) is fixedly provided with a fixture back plate (2), the fixture back plate (2) divides the fixture bottom plate (1) into a first area (101) and a second area (102), a plurality of groups of clamping assemblies (3) are arranged in the first area (101), a plurality of groups of clamping assemblies (3) are arranged side by side, the clamping ends of each group of clamping assemblies (3) extend into the second area (102) forwards, and the second area (102) is used for holding channel steel (4);

The combined milling cutter (5), the combined milling cutter (5) comprises a rod body (501), and a first blade group (502) and a second blade group (503) which are fixed on the rod body (501), wherein two first blades of the first blade group (502) are positioned on the same horizontal plane, and two second blades of the second blade group (503) are positioned on the same horizontal plane and below the first blade group (502).

2. The channel groove milling system of claim 1 wherein,

The clamping assembly (3) comprises:

The tool comprises a first threaded rod (301), wherein one end of the first threaded rod (301) is placed on the tool bottom plate (1) and located in a first area (101), the other end of the first threaded rod (301) is connected with a pressing plate (302) in a threaded mode, and one end of the pressing plate (302) can rotate and extend into the second area (102).

3. The channel groove milling system of claim 2 wherein,

A strip-shaped hole (303) is formed in the middle of the pressing plate (302), and a plurality of first threaded holes are formed in the part, located in the first area (101), of the tool bottom plate (1);

the clamping assembly (3) further comprises:

and one end of the second threaded rod (304) penetrates through the strip-shaped hole (303) and is in threaded connection with the first threaded hole.

4. The channel groove milling system of claim 3 wherein,

A plurality of second threaded holes (103) are formed in the first area (101), and each first threaded hole is located between two second threaded holes (103).

5. The channel groove milling system of claim 1 wherein,

The channel steel groove milling system further comprises a plurality of cushion blocks (6), and the cushion blocks (6) are arranged in the second area (102).

6. The channel groove milling system of claim 1 wherein,

The channel steel groove milling system further comprises a plurality of adjustable supporting components (7), and the adjustable supporting components (7) are used for being arranged in the channel steel (4).

7. The channel groove milling system of claim 1 wherein,

The channel steel groove milling system further comprises two positioning pins (8), and the positioning pins (8) are fixed on the bottom surface of the tool bottom plate (1).

8. The channel groove milling system of claim 1 wherein,

The rod body (501) comprises a main rod (5011) and an auxiliary rod (5012), wherein first grooves (504) are formed in two opposite sides of the main rod (5011), first blades are arranged in the corresponding first grooves (504), second grooves (505) are formed in two opposite sides of the auxiliary rod (5012), and the second blades are arranged in the corresponding second grooves (505);

Third screw hole (506) has been seted up to the bottom terminal surface of mobile jib (5011), the top terminal surface of auxiliary rod (5012) is fixed with third threaded rod (507), the outer wall threaded connection of third threaded rod (507) has at least one lock nut (508), just the outer wall cover of third threaded rod (507) is equipped with packing ring (509), just packing ring (509) are located the top of lock nut (508).

9. The channel groove milling system of claim 1, wherein

The two second blades are asymmetrically distributed, and an included angle between the first second blade and the second blade in the clockwise direction is 195 degrees.

10. The channel steel groove milling method is characterized by comprising the following steps of:

placing the channel steel (4) in the second area (102) and leaning against the tool backboard (2), and fixing the channel steel (4) in the second area (102) of the tool bottom plate (1) by using a plurality of groups of clamping assemblies (3);

Aligning a first blade group (502) of the combined milling cutter (5) with a groove of a first layer of the channel steel (4), and aligning a second blade group (503) with a groove of a second layer of the channel steel (4);

and starting the machine tool to work to drive the combined milling cutter (5) to rotate, and finishing milling of grooves of the first layer and the second layer of the channel steel (4).