阅读说明：本技术 一种多台阶多轮廓涂层成型铰铣刀 (Multi-step multi-profile coating forming reaming milling cutter ) 是由 咸志鹏 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种多台阶多轮廓涂层成型铰铣刀,其包括柄部和阶梯式切削部,阶梯式切削部设有4个自其前端向柄部轴向延伸的阶梯状刀槽,阶梯状刀槽朝向切削旋转方向的面为前刀面,阶梯状刀槽背向切削旋转方向的面为后刀面,前刀面与后刀面相交形成周刃,阶梯式切削部的外径自其前端向柄部呈阶梯式增大,且由小到大依次设置为一级切削部、二级切削部和三级切削部；一级切削部上的周刃设置有宽度为0.4mm～0.45mm的第一圆弧刃带和多个第一后角；二级切削部上的周刃设置有宽度为0.7mm～0.9mm的第二圆弧刃带和多个第二后角；三级切削部上的周刃设置有宽度为1mm～1.3mm的第三圆弧刃带和多个第三后角。采用本发明,具有多用途、高效率、高寿命、高精度优点。(The invention discloses a multi-step multi-profile coating forming reaming milling cutter, which comprises a handle part and a stepped cutting part, wherein the stepped cutting part is provided with 4 stepped cutter grooves axially extending from the front end to the handle part, the surface of the stepped cutter grooves facing to the cutting rotation direction is a front cutter surface, the surface of the stepped cutter grooves facing away from the cutting rotation direction is a rear cutter surface, the front cutter surface and the rear cutter surface are intersected to form a peripheral edge, the outer diameter of the stepped cutting part is increased in a stepped manner from the front end to the handle part, and the stepped cutting part is sequentially provided with a first-stage cutting part, a second-stage cutting part and a third-stage cutting part from small to large; the peripheral edge on the primary cutting part is provided with a first arc edge zone with the width of 0.4-0.45 mm and a plurality of first relief angles; the peripheral edge on the secondary cutting part is provided with a second arc edge zone with the width of 0.7-0.9 mm and a plurality of second relief angles; the peripheral edge on the third-stage cutting part is provided with a third arc edge zone with the width of 1 mm-1.3 mm and a plurality of third relief angles. The invention has the advantages of multiple purposes, high efficiency, long service life and high precision.)

1. The multi-step multi-profile coating forming reaming milling cutter is characterized by comprising a handle part and a stepped cutting part, wherein the stepped cutting part is provided with 4 stepped cutter grooves axially extending from the front end to the handle part, the surface, facing the cutting rotation direction, of each stepped cutter groove is a front cutter surface, the surface, facing the cutting rotation direction, of each stepped cutter groove is a rear cutter surface, the front cutter surface and the rear cutter surface are intersected to form a peripheral edge, the outer diameter of the stepped cutting part is increased in a stepped manner from the front end to the handle part, and the stepped cutting part is sequentially provided with a primary cutting part, a secondary cutting part and a tertiary cutting part from small to large according to the outer diameter of the stepped cutting part; a first arc-shaped cutting edge and a plurality of first relief angles are sequentially arranged on the peripheral edge of the first-stage cutting part from the cutting edge to one side of the rear cutter face, and the width of the first arc-shaped cutting edge is 0.4-0.45 mm; a second arc-shaped cutting edge and a plurality of second relief angles are sequentially arranged on the peripheral edge of the secondary cutting part from the cutting edge to one side of the rear cutter face, and the width of the second arc-shaped cutting edge is 0.7-0.9 mm; and a third arc-shaped cutting edge and a plurality of third relief angles are sequentially arranged on the peripheral edge of the third-stage cutting part from the cutting edge to one side of the rear cutter face, and the width of the third arc-shaped cutting edge ranges from 1mm to 1.3 mm.

2. The multi-step, multi-profile coating shaping backend mill of claim 1, wherein said primary cutting portion has a first rake angle, said first rake angle being 3 degrees to 5 degrees; the secondary cutting part is provided with a second front angle which is 3-5 degrees; the three-stage cutting part is provided with a third front angle which is 3-5 degrees.

3. The multi-step multi-profile coating forming reamer as claimed in claim 1, wherein the primary cutting portion, the secondary cutting portion and the tertiary cutting portion are each provided with an inverted taper in the axial direction, and the taper of the inverted taper is 0.01 to 0.015.

4. The multi-step, multi-profile coating contour reaming milling cutter of claim 1, wherein the first cutting portion has a chamfer at a leading tip.

5. The multi-step, multi-profile coating contour reaming milling cutter of claim 1, wherein a first stress relief is provided at a change between the primary cutting portion and the secondary cutting portion; and a second stress relieving part is arranged at the diameter changing position between the secondary cutting part and the tertiary cutting part.

6. The multi-step multi-profile coating shaping reamer of claim 1, wherein a first relief angle of the plurality of first relief angles adjacent to the first rounded land is between 14 degrees and 16 degrees, and a width of a flank corresponding to the first relief angle is between 1.1mm and 1.3 mm; a second relief angle, which is close to the second arc-shaped blade edge, among the plurality of second relief angles is 14 to 16 degrees, and the width of a relief surface corresponding to the second relief angle is 1.1 to 1.3 mm; among the plurality of third relief angles, a second relief angle closer to the second arc land is 14 to 16 degrees, and a width of a relief surface corresponding to the third relief angle is 1.1 to 1.3 mm.

7. The multi-step multi-profile coating contour reaming milling cutter as claimed in claim 1, wherein the cutting edge of the peripheral edge on the primary cutting portion has a center of height of 0.1mm to 0.15 mm; the high center of the cutting edge of the peripheral edge on the secondary cutting part is 0.1 mm-0.15 mm; the high center of the cutting edge of the peripheral edge on the three-stage cutting part is 0.1 mm-0.15 mm.

8. The multi-step, multi-profile coating contour reaming milling cutter of claim 1, wherein the stepped cutting portion is coated with a coating.

9. The multi-step multi-profile coating forming reamer as claimed in any one of claims 1 to 8, wherein a cooling flow passage is further provided, the cooling flow passage comprising a main flow passage extending through the stepped cutting portion and the shank portion and forming a coolant inlet at a rear end surface of the shank portion, and a plurality of branch flow passages extending through the stepped cutting portion and having one end communicating with the main flow passage and the other end forming a coolant outlet in the stepped cutter groove, the coolant outlet being directed to the peripheral edge side.

10. The multi-step, multi-profile coating milling cutter of claim 9, wherein the front face of the stepped cutting portion is provided with a counterbore, the counterbore being in communication with the primary flow passage, the counterbore being provided with a plug for plugging the primary flow passage from which coolant flows.

Technical Field

The invention belongs to the technical field of machining cutters, and particularly relates to a multi-step multi-profile coating forming reaming cutter.

Background

A milling cutter is a rotating tool with one or more cutter teeth for milling. When in work, each cutter tooth cuts off the allowance of the workpiece in sequence and intermittently. The milling cutter is mainly used for processing planes, steps, grooves, formed surfaces, cut-off workpieces and the like on a milling machine.

The milling cutter may be further classified into a cylindrical milling cutter, a face milling cutter, an end milling cutter, a face milling cutter, an angle milling cutter, a saw blade milling cutter and a T-shaped milling cutter according to the purpose. The milling cutter can be divided into an integral milling cutter, an integral welding tooth type milling cutter, an insert tooth type milling cutter and an indexable type milling cutter according to the assembling form of the milling cutter and the cutter body.

With the development of milling cutter industry, milling cutters are also widely used in the hole machining and cavity machining directions. The milling of holes is widely used in the machining industry, in particular to the machining of complex holes in the aerospace field, the automobile engine field and the complex equipment field. The requirements of machining of various composite holes on machine tool equipment and cutters are higher and higher, the machining precision requirements are met, the service life of the cutters is guaranteed, and meanwhile, the machining cost is low.

The machining of the stepped hole is mainly carried out in a mode of combining an alloy drill bit and an end mill, firstly, the alloy drill bit is used for roughly machining a small-diameter hole and a large-diameter hole in sequence, and then the end mill is used for finely machining the small-diameter hole and the large-diameter hole in sequence.

In order to improve the machining efficiency, the common conventional step milling cutter is adopted to machine the step hole at one time in the market at present, but the risks of serious cutter breakage and increased rejection rate of the milling cutter exist, so that the production cost is high.

Disclosure of Invention

The invention aims to provide a multi-step multi-profile coating forming reaming cutter with the advantages of multiple purposes, high efficiency, long service life and high precision.

In order to achieve the above object, the present invention provides a multi-step multi-profile coating formed reamer, comprising a shank and a stepped cutting portion, wherein the stepped cutting portion is provided with 4 stepped sipes axially extending from the front end to the shank, the surface of the stepped sipe facing the cutting rotation direction is a rake surface, the surface of the stepped sipe facing away from the cutting rotation direction is a flank surface, the rake surface and the flank surface intersect to form a peripheral edge, the outer diameter of the stepped cutting portion increases in a stepped manner from the front end to the shank, and the stepped cutting portion is sequentially provided with a first-stage cutting portion, a second-stage cutting portion and a third-stage cutting portion from small to large; a first arc-shaped cutting edge and a plurality of first relief angles are sequentially arranged on the peripheral edge of the first-stage cutting part from the cutting edge to one side of the rear cutter face, and the width of the first arc-shaped cutting edge is 0.4-0.45 mm; a second arc-shaped cutting edge and a plurality of second relief angles are sequentially arranged on the peripheral edge of the secondary cutting part from the cutting edge to one side of the rear cutter face, and the width of the second arc-shaped cutting edge is 0.7-0.9 mm; and a third arc-shaped cutting edge and a plurality of third relief angles are sequentially arranged on the peripheral edge of the third-stage cutting part from the cutting edge to one side of the rear cutter face, and the width of the third arc-shaped cutting edge ranges from 1mm to 1.3 mm.

As a preferable aspect of the present invention, the first-stage cutting portion is provided with a first rake angle, and the first rake angle is 3 degrees to 5 degrees; the secondary cutting part is provided with a second front angle which is 3-5 degrees; the three-stage cutting part is provided with a third front angle which is 3-5 degrees.

According to the preferable scheme of the invention, inverted cones are reserved on the first-stage cutting part, the second-stage cutting part and the third-stage cutting part in the axial direction, and the taper of each inverted cone is 0.01-0.015.

In a preferred embodiment of the present invention, a chamfer is provided at a sharp corner at the front end of the primary cutting portion.

As a preferable aspect of the present invention, a first stress relief portion is provided at a diameter change portion between the primary cutting portion and the secondary cutting portion.

As a preferable aspect of the present invention, a second stress relief portion is provided at a diameter change portion between the secondary cutting portion and the tertiary cutting portion.

In a preferred embodiment of the present invention, a first relief angle closer to the first arc land among the plurality of first relief angles is 14 to 16 degrees, and a width of a flank corresponding to the first relief angle is 1.1 to 1.3 mm; a second relief angle, which is close to the second arc-shaped blade edge, among the plurality of second relief angles is 14 to 16 degrees, and the width of a relief surface corresponding to the second relief angle is 1.1 to 1.3 mm; among the plurality of third relief angles, a second relief angle closer to the second arc land is 14 to 16 degrees, and a width of a relief surface corresponding to the third relief angle is 1.1 to 1.3 mm.

In a preferred embodiment of the present invention, the height center of the cutting edge of the peripheral edge on the primary cutting portion is 0.1mm to 0.15 mm; the high center of the cutting edge of the peripheral edge on the secondary cutting part is 0.1 mm-0.15 mm; the high center of the cutting edge of the peripheral edge on the three-stage cutting part is 0.1 mm-0.15 mm.

In a preferred embodiment of the present invention, the stepped cutting portion is coated with a nano-scale high silica alumina hard coat layer.

In a preferred embodiment of the present invention, the multi-step multi-profile coating formed reamer is further provided with a cooling flow channel, the cooling flow channel includes a main flow channel and a plurality of branch flow channels, the main flow channel penetrates through the stepped cutting portion and the shank portion, a coolant inlet is formed in a rear end surface of the shank portion, the branch flow channels penetrate through the stepped cutting portion, one end of each branch flow channel is communicated with the main flow channel, the other end of each branch flow channel forms a coolant outlet in the stepped cutter groove, and the coolant outlet faces the peripheral edge side.

As a preferable scheme of the present invention, a counter bore is provided on a front end face of the stepped cutting portion, the counter bore is communicated with the main flow passage, and a plug for plugging coolant in the main flow passage from flowing out of the counter bore is provided in the counter bore.

Compared with the prior art, the multi-step multi-profile coating forming reaming milling cutter provided by the invention has the beneficial effects that:

the first-stage cutting part, the second-stage cutting part and the third-stage cutting part with different outer diameters are arranged, so that the processing requirements of round holes or stepped holes with different apertures can be met, a large amount of processing time and tool setting time are saved, the form and position tolerance precision between two stepped surfaces is greatly improved, the coaxiality (within 0.005) of the stepped holes processed by the stepped holes is effectively ensured, the product quality is improved, and the method is particularly suitable for processing multiple sections of stepped holes in the fields of aerospace, automobiles, ultra-high precision machine tools and the like; in addition, according to each level of cutting parts with different outer diameters, the first arc-shaped cutting edge, the second arc-shaped cutting edge and the third arc-shaped cutting edge with different widths are arranged at the positions close to the cutting edge of the peripheral edge, so that compared with the traditional relief angle plane, the support and firmness of the cutting edge can be enhanced, the service life of a cutter is prolonged, the machining precision is stable, and the surface quality of a machined product is good; in addition, with the design of week sword relief angle for a plurality of relief angle angles, can guarantee that week sword has sufficient rigidity, for week sword provides enough dodges the space simultaneously, reduces the contact friction of the back knife face of week sword and work piece machined surface, is favorable to the cutting into of week sword. Therefore, the multi-step multi-profile coating forming reaming milling cutter has the advantages of multiple purposes, high efficiency, long service life and high precision.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

FIG. 1 is a schematic view of a multi-step multi-profile coated formed end mill according to the present invention;

FIG. 2 is a cross-sectional view of a primary cutting portion;

fig. 3 is a distribution diagram of the cooling flow path.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the machine or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 1 and 2, a multi-step multi-profile coating formed reamer according to a preferred embodiment of the present invention includes a shank 1 and a stepped cutting portion 2, the stepped cutting portion 2 is provided with 4 stepped sipes 21 axially extending from a front end thereof to the shank 1, a surface of the stepped sipe 21 facing a cutting rotation direction is a rake surface 22, a surface of the stepped sipe 21 facing away from the cutting rotation direction is a flank surface 23, the rake surface 22 intersects with the flank surface 23 to form a peripheral edge 24, an outer diameter of the stepped cutting portion 2 is increased in a stepped manner from the front end thereof to the shank 1, and the stepped cutting portion 2 is sequentially provided with a first-stage cutting portion 2a, a second-stage cutting portion 2b and a third-stage cutting portion 2c from small to large according to the outer diameter of the stepped cutting portion 2; a first arc-shaped blade zone 25 and a plurality of first relief angles (261 and 262) are sequentially arranged on the peripheral edge 24 of the primary cutting part 2a from the cutting edge to one side of the relief surface 23, and the width of the first arc-shaped blade zone 25 is 0.4-0.45 mm; a second arc-shaped blade zone and a plurality of second relief angles are sequentially arranged on the peripheral edge 24 of the secondary cutting part 2b from the cutting edge to one side of the relief tool face 23, and the width of the second arc-shaped blade zone is 0.7-0.9 mm; the peripheral edge 24 on the third-stage cutting part 2c is provided with a third arc-shaped edge zone and a plurality of third relief angles in sequence from the cutting edge to the side of the relief tool surface 23, and the width of the third arc-shaped edge zone is 1 mm-1.3 mm.

Therefore, the first-stage cutting part 2a, the second-stage cutting part 2b and the third-stage cutting part 2c with different outer diameters are arranged, so that the processing requirements of round holes or stepped holes with different apertures can be met, a large amount of processing time and tool setting time are saved, the form and position tolerance between two stepped surfaces is greatly improved, the coaxiality (within 0.005) of the stepped hole processed by the stepped hole is effectively guaranteed, the product quality is improved, and the method is particularly suitable for processing multiple sections of stepped holes in the fields of aerospace, automobiles, ultra-high precision machine tools and the like; in addition, according to each level of cutting parts with different outer diameters, the first arc-shaped blade zone 25, the second arc-shaped blade zone and the third arc-shaped blade zone with different widths are arranged at the position close to the cutting edge of the peripheral blade 24, compared with the traditional relief angle plane, the support property and firmness of the cutting edge can be enhanced, the service life of the cutter is prolonged, the machining precision is stable, and the surface quality of a machined product is good; in addition, the relief angle of the peripheral edge 24 is designed to be a plurality of relief angles, so that the peripheral edge 24 can be ensured to have sufficient rigidity, meanwhile, a sufficient avoiding space is provided for the peripheral edge 24, the contact friction between the flank surface 23 of the peripheral edge 24 and the workpiece machining surface is reduced, and the cutting-in of the peripheral edge 24 is facilitated. Therefore, the multi-step multi-profile coating forming reaming milling cutter has the advantages of multiple purposes, high efficiency, long service life and high precision.

Illustratively, as shown in fig. 2, the primary cutting portion 2a is provided with a first rake angle 27, and the first rake angle 27 is 3 degrees to 5 degrees; the secondary cutting part 2b is provided with a second front angle which is 3-5 degrees; the three-stage cutting part 2c is provided with a third front angle which is 3-5 degrees. Therefore, the front angle of the whole circumferential edge 24 is designed to be 3-5 degrees, so that the material characteristics of a machined object are met, the sharpness of the circumferential edge 24 is guaranteed, burrs, edge breakage and other phenomena cannot occur in the cutting process, the machining effect is good, and the product rejection rate is low.

It should be noted here that, since the cross-sectional structural shapes of the primary cutting portion 2a, the secondary cutting portion 2b and the tertiary cutting portion 2c are similar, reference numerals of the second circular arc land, the second relief angle and the second rake angle corresponding to the secondary cutting portion 2b c, and reference numerals of the third circular arc land, the third relief angle and the third rake angle corresponding to the tertiary cutting portion 2 can refer to reference numerals of the first circular arc land 25, the first relief angle (261 and 262) and the first rake angle 27 shown in the primary cutting portion 2a in fig. 2.

Illustratively, the first-stage cutting portion 2a, the second-stage cutting portion 2b and the third-stage cutting portion 2c are provided with inverted cones in the axial direction, so that friction between the first-stage cutting portion and the hole wall can be reduced, abnormal scraping between the peripheral edge 24 of the reaming and milling cutter and the hole wall when the center of the tail seat of the machine tool slightly deviates from the center is avoided, the roughness of the hole wall is increased, and the machining stability is maintained. In the embodiment, the taper of the inverted cone is preferably 0.01-0.015.

Illustratively, as shown in fig. 1, a chamfer 28 is provided at a sharp corner of the front end of the primary cutting portion 2a, and the chamfer 28 plays a role in guiding the reaming milling cutter, thereby facilitating the alignment and feeding of the reaming milling cutter. In the present embodiment, the chamfer 28 is preferably 60 to 62 degrees.

For example, as shown in fig. 1, in order to eliminate the stress concentration characteristic in the transition region between two different diameters, a first stress eliminating part 29 is arranged at the reducing part between the primary cutting part 2a and the secondary cutting part 2 b; and a second stress relieving part is arranged at the reducing part between the secondary cutting part 2b and the tertiary cutting part 2 c. In this embodiment, since the difference between the outer diameter of the primary cutting portion 2a and the outer diameter of the secondary cutting portion 2b is small, the first stress relief portion 29 is implemented by a chamfer of 60 to 62 degrees, such a design can also play a role in guiding the secondary cutting portion 2b while relieving the stress concentration characteristic, thereby facilitating the alignment and feeding of the secondary cutting portion 2b, and the hole shape machined at the position does not form a right-angled step surface at the position, thereby effectively preventing chips from being left at the step root to affect the quality of the machined surface. Because the difference between the outer diameter of the secondary cutting part 2b and the outer diameter of the tertiary cutting part 2c is larger, the second stress relief part is realized by two chamfers (210 and 211) and a transition fillet 212, the two chamfers (210 and 211) and the transition fillet 212 are sequentially arranged from the secondary cutting part 2b to the tertiary cutting part 2c, the angles of the two chamfers (210 and 211) are 45 degrees and 15 degrees in sequence, and the radius of the transition fillet 212 is less than or equal to 0.2 mm; the design can play a role in guiding the three-stage cutting part 2c while eliminating stress concentration characteristics, alignment and feed of the three-stage cutting part 2c are facilitated, and a hole formed by machining the part cannot form a right-angle step surface at the part, so that the problem that the quality of a machined surface is influenced due to the fact that chips are left at the root of a step is effectively avoided.

Exemplarily, as shown in fig. 2, a first relief angle 261 near the first circular-arc land 25 among the plurality of first relief angles (261 and 262) is 14 to 16 degrees, and a width of the flank 23 corresponding to the first relief angle 261 is 1.1 to 1.3 mm; a second relief angle, which is closer to the second arc land, among the plurality of second relief angles, is 14 to 16 degrees, and a width of a relief surface 23 corresponding to the second relief angle is 1.1 to 1.3 mm; among the plurality of third relief angles, a second relief angle closer to the second arc land is 14 to 16 degrees, and a width of the relief surface 23 corresponding to the third relief angle is 1.1 to 1.3 mm. By adopting the design, the service life of the peripheral edge 24 under the condition of normal cutting can be ensured, and meanwhile, the peripheral edge 24 has enough wear resistance and cutting force.

Illustratively, as shown in fig. 2, the cutting edge height center of the peripheral edge 24 on the primary cutting part 2a is 0.1 mm-0.15 mm; the cutting edge of the peripheral edge 24 on the secondary cutting part 2b is 0.1 mm-0.15 mm high in center; the cutting edge height center of the peripheral edge 24 on the tertiary cutting part 2c is 0.1 mm-0.15 mm. Due to the design, the supporting performance and firmness of the peripheral edge 24 can be enhanced, the service life is long, the processed aperture is stable, and the surface roughness is excellent.

Illustratively, the stepped cutting portion 2 is coated with a nano-scale high silicon aluminum hard coating (AlTiN-Si) for reducing cutting friction and increasing wear resistance of the tool, so as to ensure the life and machining effect of the punch.

Illustratively, as shown in fig. 3, the multi-step multi-profile coating formed reamer is further provided with a cooling flow channel, the cooling flow channel includes a main flow channel 31 and a plurality of branch flow channels 32, the main flow channel 31 penetrates through the stepped cutting portion 2 and the shank portion 1, and forms a coolant inlet on the rear end surface of the shank portion 1, the branch flow channels penetrate through the stepped cutting portion 2, and one end of the branch flow channels 32 communicates with the main flow channel 21, and the other end of the branch flow channels 32 forms a coolant outlet in the stepped cutter groove, the coolant outlet facing the peripheral edge 24 side. Therefore, each peripheral edge 24 is provided with a special cooling flow channel for cooling, and a good cooling effect of the cutter during machining is guaranteed.

Illustratively, as shown in fig. 3, the front end face of the stepped cutting portion 2 is provided with a counterbore 213 to reduce friction between the front end face of the stepped cutting portion 2 and a machined surface; the counterbore 231 is communicated with the main flow passage 31, and a plug 33 for blocking the coolant in the main flow passage 31 from flowing out of the counterbore is arranged in the counterbore 231. When necessary, can open and block up 33, make the coolant flow out from the front end of cascaded cutting portion 2, effectively erode the reaming cutter front end and remain the smear metal, prevent that the smear metal from piling up in the reaming cutter front end, make things convenient for the smear metal to discharge.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.