CN218139096U - Tool for machining cover plate - Google Patents

Abstract

The utility model relates to a cutter for processing apron, including main shaft and spot facing work portion, spot facing work portion joins in marriage in the one end of main shaft, from the directional main shaft's of spot facing work portion direction on, spot facing work portion opens thick section, first changeover portion and the section of polishing of truing hole including coaxial coupling's punching in proper order. Wherein, punch and open thick section including the rough trimming section, the section of polishing in the finishing hole includes the finishing section, and the external diameter of rough trimming section is greater than the external diameter of finishing section, and the external diameter of first changeover portion is greater than the external diameter of rough trimming section. Because set up first changeover portion for need not to punch and open thick section and finish and repair the hole and polish and set up the sand separating section between the section, avoided in cutter sand plating process the easy long-pending sand of sand separating section, and then appear Kong Beng and the problem of hole split easily. The problem of punch and open thick section because the diameter is too big be difficult for punching on the apron is solved, also reduced punch and open thick section and finish hole section because the diameter undersize and cause the little easy degritting risk of cutter intensity, avoided frequently changing the cutter, improved the production efficiency of product.

Description

Tool for machining cover plate

Technical Field

The utility model relates to a machine-shaping technical field especially relates to a cutter for processing apron.

Background

Since the touch era, the capacitive touch screen has become a main component of a mobile phone, a tablet, a touch notebook and other human-computer interactive mobile terminals by virtue of its advantages of stable performance, good touch feeling and the like. No matter what kind of touch technology, the apron all is essential protection component, and cover plate glass has been used on many electronic equipment because its high light transmissivity, strong scratch resistance etc. characteristic, becomes the mainstream product of apron, lid, on-vehicle screen apron etc. around the cell-phone. In the electronic product, the cover plate usually needs to be provided with a hole and a groove structure to meet the use requirements of various electronic products. With the gradual maturity and popularization of the full-screen technology, the functions of electronic products are diversified, the requirements on the dimensional accuracy of holes of cover plate glass in the electronic products are stricter, the size specifications of the holes are smaller, and the traditional processing technology is challenged more and more.

In the operation step of processing the small hole or the long slot on the cover plate, a through hole is usually drilled on the cover plate glass by a drill, then a rough trimming and hole grinding section is used to roughly grind the inner side wall of the through hole or directly rough trim the long slot, then a fine trimming and hole grinding section is used to finely grind the inner side wall of the through hole or the slot, and a chamfer is processed to complete the processing of the through hole or the slot. However, in the design of the existing cover plate processing tool, if the sizes of the diamond grit layers of the finishing hole polishing section and the rough hole polishing section are not consistent, a sand separation groove needs to be designed between the finishing hole polishing section and the rough hole polishing section to prevent sand grains of different sizes from mixing into each other and affecting the product quality. However, due to the limitation of the existing sand plating process, floating sand is easily accumulated in the sand separating groove in the sand plating process of the cutter, so that the sand accumulation phenomenon is caused, and Kong Beng and hole cracking phenomena are easily caused when the cutter performs rough machining on a through hole of a product, so that the quality of the product is seriously influenced; and because the cutter desanding leads to the lack of cutter rigidity, the cutter has short service life, and further the cutter changing is frequent, and the production efficiency of products is influenced.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to be directed against the easy sand accumulation in the sand separating groove in the cutter based on current apron processing, leads to the product to appear Kong Beng and hole crack easily in the course of working to because the cutter desanding makes the cutter rigidity not enough, and then leads to the frequent problem of tool changing, provide a life is longer and can not the sand accumulation in the course of working be used for processing the cutter of apron.

According to an aspect of the present application, there is provided a tool for machining a cover plate, comprising: a main shaft controlled to be rotatable around its own axis direction; the hole machining part is matched and connected with one end of the main shaft along the axis direction of the main shaft, and points to the direction of the main shaft from the hole machining part, and the hole machining part comprises a punching rough section, a first transition section and a finishing hole grinding section which are coaxially connected in sequence; the punching and roughing section comprises a roughing section, the finishing hole polishing section comprises a finishing section, the outer diameter of the roughing section is larger than the outer diameter of the finishing section, and the outer diameter of the first transition section is larger than the outer diameter of the roughing section.

In one embodiment, the punching rough section further comprises a punching section arranged at the bottom of the rough trimming section, and the outer diameter of the punching section is gradually reduced and converged at one point from the direction from the main shaft to the hole processing part.

In one embodiment, the finishing hole polishing section includes a first chamfer section and a second chamfer section which are arranged at two opposite ends of the finishing section in the axial direction of the main shaft, and the outer diameter of the first chamfer section gradually decreases and the outer diameter of the second chamfer section gradually increases in the direction from the main shaft to the hole machining part.

In one embodiment, the outer surfaces of the rough perforated section and the finishing perforated section are covered with a first layer of diamond grit.

In one embodiment, the tool further comprises a shape processing portion and a first transition portion, one end of the shape processing portion is coupled to the spindle, and the other end of the shape processing portion is coupled to the hole processing portion through the first transition portion.

In one embodiment, the shape processing portion includes a rough shape polishing section, a fine shape polishing section, and a semi-fine shape polishing section coaxially arranged in this order in a direction from the spindle toward the hole processing portion.

In one embodiment, a sand separation section for separating the rough appearance polishing section from the fine appearance polishing section is arranged between the rough appearance polishing section and the fine appearance polishing section, the outer diameter of the sand separation section is smaller than the outer diameter of the rough appearance polishing section and the outer diameter of the fine appearance polishing section, a second diamond sand layer covers the outer surface of the rough appearance polishing section, a third diamond sand layer covers the outer surfaces of the fine appearance polishing section and the semi-fine appearance polishing section, and the mesh number of the second diamond sand layer is smaller than that of the third diamond sand layer.

In one embodiment, in the direction in which the main axis points to the hole machining portion, the first transition portion includes a second transition section and a third transition section which are coaxially connected in sequence; wherein, in the direction that the main shaft points to the hole machining part, the outer diameter of the second transition section is gradually reduced, and the outer diameter of the third transition section is equal to the outer diameter of one end of the second transition section close to the third transition section.

In one embodiment, the tool further comprises a second transition portion, and two opposite ends of the second transition portion are respectively connected with the main shaft and the profile machining portion.

In one embodiment, the second transition portion is provided with a positioning line which surrounds the second transition portion along the circumferential direction of the second transition portion, and the positioning line is used for providing a reference datum for the installation height of the tool during machining.

The aforesaid a cutter for processing apron, the hole processing portion through in the cutter is coaxial in proper order sets up and punches and opens thick section, first changeover portion and finishing hole section of polishing, make to punch and open thick section and finishing hole section of polishing direct through first changeover portion be connected, thereby need not to punch and open and set up at thick section and finishing hole section of polishing and separate the sand groove, avoided the cutter to separate the easy accumulation of sand groove and float sand in the course of working, and then appear Kong Beng and the problem of hole split when processing easily. And owing to set up the changeover portion for punch and open thick section and finish off the hole section and can design for comparatively suitable diameter, solved and punched and opened thick section and cause the problem that is difficult to punch on the apron because the diameter is too big, also reduced simultaneously and punched and opened thick section and finish off the hole section and cause the risk that cutter intensity is little and the easy degritting because the diameter undersize, avoided frequently changing the cutter, improved the production efficiency of product.

Drawings

Fig. 1 is a schematic structural diagram of a cutting tool according to an embodiment of the present invention;

fig. 2 is a detail view showing a cutter according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating operations of drilling and rough grinding the cover glass by the cutter according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating a finishing and polishing operation performed on a cover glass by a cutter according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of the cutter provided by the embodiment of the present invention for performing the finishing and polishing operation on the cover glass.

Description of reference numerals:

10. a cutter; 100. a hole processing section; 110. punching and opening a thick section; 111. a rough trimming section; 112. punching a hole section; 120. a first transition section; 130. finely trimming a hole grinding section; 131. a fine trimming section; 132. a first chamfered section; 133. a second chamfer section; 200. a first transition portion; 210. a second transition section; 220. a third transition section; 300. a shape processing section; 310. a coarse-profile grinding section; 320. a sand separation section; 330. a fine profile grinding section; 340. a semi-finish profile grinding section; 350. a third chamfer section; 400. a second transition portion; 410. a fourth transition section; 420. a columnar section; 421. positioning a line; 500. a main shaft; 60. a cover glass.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a cutter for processing apron, this sword can be used for processing, polishing and the chamfer to the outline of apron, also can slot or drill to the apron to carry out the truing to the inner wall in hole or groove and polish, in order to obtain final apron finished product.

Next, the structure of the tool for machining a cover plate in the present application will be described by taking the machining of a cover plate glass as an example. The present embodiment is described as an example, and the technical scope of the present application is not limited thereto. It is understood that in other embodiments, the tool can be used to machine workpieces that are not limited to cover plates, and can machine any other type of workpiece, without limitation.

A preferred embodiment of the tool for machining a cover plate is described further below.

As shown in fig. 1 and 2, a tool 10 for machining a cover plate (e.g., a cover glass) includes a hole machining portion 100, a first transition portion 200, an outer shape machining portion 300, a second transition portion 400, and a main shaft 500, which are sequentially connected in an axial direction thereof. Wherein the main shaft 500 is used for connecting a driving mechanism such as a motor and the like so that the tool 10 can rotate around the axis direction thereof in a controlled manner, and the main shaft 500 is preferably made of high-speed steel material so as to ensure the working life of the whole tool 10 structure; the hole machining part 100 is arranged at the bottom end of the cutter 10, is connected to one end of the main shaft 500 sequentially through the first transition part 200, the shape machining part 300 and the second transition part 400, and is used for drilling holes or grooves in the cover glass 60 and performing rough trimming and fine trimming on the inner walls of the holes or the grooves so that the inner diameters of the holes or the grooves reach the specified dimensional accuracy; one end of the outline machining part 300 is coupled to the main shaft 500 through the second transition part 400, and the other end is coupled to the hole machining part 100 through the first transition part 200, and is used for machining, chamfering and polishing the outline of the cover glass 60 so that the outline of the cover glass 60 reaches a specified outline and size. The first transition portion 200 is used to connect the hole processing portion 100 and the shape processing portion 300 and to separate the hole processing portion 100 and the shape processing portion 300 of different sand models, and the second transition portion 400 is used to connect the shape processing portion 300 and the main shaft 500.

In some embodiments, the hole machining portion 100 includes a rough hole drilling section 110, a first transition section 120, and a finishing hole polishing section 130, which are coaxially connected in sequence, in a direction from the hole machining portion 100 to the main shaft 500 (i.e., a bottom-up direction). Punching and opening thick section 110 and being used for trompil on the apron to roughly repair the inside wall of hole, make the aperture in the hole after roughly repairing leave certain surplus, be close to the aperture size who will process promptly, the section 130 of polishing in the truing hole is used for carrying out the truing to the inside wall of hole, polishes the surplus that leaves after roughly repairing, makes the internal diameter in hole reach the precision size and the shape that need. The first transition section 120 is used to connect the rough perforated section 110 and the finishing polished section 130.

In one embodiment, the punching rough section 110 includes a rough trimming section 111 and a punching section 112 disposed at the bottom of the rough trimming section 111, wherein the rough trimming section 111 is in a column shape, and the outer diameter of the punching section 112 gradually decreases and converges at a point in the direction in which the main shaft 500 points to the hole processing portion 100. In the embodiment shown in the figures, the perforated section 112 is spherically arcuate. Finishing hole section 130 of polishing includes finishing section 131, and sets up first chamfer section 132 and second chamfer section 133 at the axial direction (being cutter 10 self axial direction) both ends of finishing section 131, and finishing section 131 is the column, and first chamfer section 132 and second chamfer section 133 are the halfpace form, and on the direction of the directional spot facing work portion 100 of autonomic axle 500, the external diameter of first chamfer section 132 reduces gradually, and the external diameter of second chamfer section 133 increases gradually. The first and second chamfered sections 132 and 133 are used for the finishing section 131 to chamfer the upper and lower edges of the hole together when finishing the inner side wall of the hole. The first transition section 120 is also cylindrical. Preferably, the outer diameter of the rough trimming section 111 is larger than that of the finishing section 131, and the outer diameter of the first transition section 120 is larger than that of the rough trimming section 111. The outer diameter of the first transition section 120 is slightly smaller than the inner diameter of the hole to be machined or the width of the groove to be machined, for example, 0.05mm to 0.15mm smaller than the inner diameter of the hole or the width of the groove, so that the first transition section 120 can pass through the hole to be machined when the tool 10 needs to grind the inner side wall of the hole by using the finishing section 131.

In order to enable the cutter 10 to have cutting force when the cover glass 60 is machined, the outer surfaces of the punching rough section 110 and the finishing hole grinding section 130 are covered with a first diamond layer in a plating mode or the like, and the mesh number of the first diamond layer is 600-1200 meshes. Further, the mesh number of the first diamond dust layer may be 800 mesh to 1000 mesh.

Thus, when the cutter 10 is used for processing the cover glass 60, firstly, the drilling section 112 drills a through hole in a spiral feeding mode, the through hole can be a decoration hole, a mic hole and the like, then the rough trimming section 111 polishes and roughly trims the inner side wall of the through hole, and finally the finishing section 131 performs finishing polishing and chamfering on the inner side wall of the through hole, so that the processing of the through hole on the cover glass is completed.

The outer diameters of the rough hole-making section 110, the first transition section 120, and the finish hole-grinding section 130 of the hole-machining section 100 are determined according to the inner diameter or the groove width of the hole to be machined, and the shape of the hole-machining section 100 is not limited to the above-described shape, and may be designed separately as necessary. For example, the perforated thick section 110 may not include the perforated section 112, and drilling can be performed even if the bottom end of the perforated thick section 110 is a plane, but obviously, the spherical perforated section 112 is included, so that drilling is better, and Kong Beng and hole cracking are not easily generated. For another example, when the hole is not required to be chamfered, the finishing hole grinding section 130 may not include the first chamfer section 132 and the second chamfer section 133, but only include the finishing section 131, and is not limited thereto.

In some embodiments, the contour machining portion 300 includes a rough contour polishing section 310, a sand exclusion section 320, a fine contour polishing section 330, and a semi-fine contour polishing section 340, which are coaxially arranged in this order, from the direction in which the main shaft 500 points toward the hole machining portion 100. In the embodiment shown in the drawings, the rough outer shape polishing section 310, the fine outer shape polishing section 330 and the semi-fine outer shape polishing section 340 are all columnar and have equal outer diameters, and the rough outer shape polishing section 310, the fine outer shape polishing section 330 and the semi-fine outer shape polishing section 340 are all connected with a third chamfer section 350 in a trapezoidal shape at respective ends thereof so as to machine a chamfer on the outer contour of the cover glass 60 when the outer contour of the cover glass 60 is machined, and the specific structure of the third chamfer section 350 is similar to the structures of the first chamfer section 132 and the second chamfer section 133, and is not described herein again. The rough-contour polishing section 310 is used for primarily processing the outer contour of the cover plate to enable the outer contour size of the cover plate to be close to a target size, and a certain processing allowance is reserved, the semi-fine-contour polishing section 340 is used for removing part of the processing allowance to enable the outer contour size of the cover plate to be closer to the target size, and the fine-contour polishing section 330 is used for removing the remaining processing allowance to enable the outer contour size of the cover plate to reach the target size.

In one embodiment, the outer surface of the coarse profile sanding section 310 is covered with a second layer of diamond grit, and the outer surfaces of the fine profile sanding section 330 and the semi-fine profile sanding section 340 are covered with a third layer of diamond grit of a different type than the second layer of diamond grit, wherein the mesh count of the second layer of diamond grit is less than the mesh count of the third layer of diamond grit, and therefore, the third layer of diamond grit is finer than the second layer of diamond grit. Preferably, the mesh number of the second carborundum layer is 300 meshes to 600 meshes, further 400 meshes to 500 meshes, and the mesh number of the third carborundum layer is 1000 meshes to 1400 meshes, further 1200 meshes to 1300 meshes.

Preferably, a sand isolating section 320 is arranged between the rough-shape polishing section 310 and the fine-shape polishing section 330 to isolate the rough-shape polishing section 310 from the fine-shape polishing section 330, and the outer diameter of the sand isolating section 320 is smaller than that of the rough-shape polishing section 310 and smaller than that of the fine-shape polishing section 330, so as to ensure that sand grains of different types of diamond sand layers are not mixed with each other to cause desanding or scratch on the cover glass 60 to affect the product quality of the cover glass 60.

It should be noted that the rough-contour polishing section 310, the fine-contour polishing section 330, and the semi-fine-contour polishing section 340 may be provided with diamond sand layers of the same type, and at this time, the sand-separating section 320 may not be provided between the rough-contour polishing section 310 and the fine-contour polishing section 330, which is not limited specifically.

Just because it has the first diamond dust layer to open thick section 110 and cover to punch, appearance processing portion 300 covers has second diamond dust layer and third diamond dust layer, connects and separates each other through first transition portion 200 between hole processing portion 100 and the appearance processing portion 300, and first transition portion 200 has the effect of connecting and separating sand this moment. In a direction from the main shaft 500 to the hole machining portion 100, the first transition portion 200 includes a second transition section 210 and a third transition section 220 coaxially connected in sequence, wherein one end of the third transition section 220 is connected to the hole machining portion 100. The third transition section 220 is cylindrical, two opposite ends of the third transition section 220 are respectively connected with the second transition section 210 and the first chamfer section 132 of the finishing hole polishing section 130, in the above direction, the outer diameter of the second transition section 210 is gradually reduced, the outer diameter of the third transition section 220 is equal to the outer diameter of one end of the second transition section 210 close to the third transition section 220, and is equal to the outer diameter of one end of the first chamfer section 132 close to the third transition section 220.

In some embodiments, the second transition 400 includes a fourth transition section 410 in the shape of a step and a cylindrical section 420 connected to the fourth transition section 410, wherein the fourth transition section 410 is connected to the rough contour grinding section 310 of the contour machining part 300, one end of the cylindrical section 420 is connected to the fourth transition section 410, and the other end is connected to the spindle 500 to connect the spindle 500 and the contour machining part 300.

Preferably, referring to fig. 1, a positioning line 421 surrounding the cylindrical section 420 along the circumferential direction of the second transition portion 400 is disposed on the cylindrical section 420 of the second transition portion 400, the positioning line 421 may be a mark engraved on the cylindrical section 420 or a mark coated on the surface of the cylindrical section 420, and the positioning line 421 is used to provide a reference for the installation height of the tool 10 during machining, so as to prevent the installation height of the tool 10 from being too high or too low to affect the machining quality of the cover glass 60.

In order to make those skilled in the art better understand the structure of the tool 10 for machining a cover plate provided in the embodiments of the present application, the following description will be further made with reference to fig. 3 to 5, taking the diameter of the hole drilling section 112 and the diameter of the rough trimming section 111 as 0.45mm, the diameter of the fine trimming section 131 as 0.33mm, the thickness of the cover glass 60 as 0.5mm, the diameter of the micro hole to be machined as 0.7mm, and the dimensions of the upper and lower chamfers as 0.12mm × 45 °, and the machining steps for machining the micro hole by using the tool 10 are as shown in the following table.

Watch 1

Firstly, as shown in fig. 3, a punching section 112 of a cutter 10 is used for punching holes in a pre-processing hole position of cover glass 60 in a spiral feeding mode, wherein 0.04mm is used as a spiral radius, the feeding speed is 25mm/min, each layer of spiral is fed downwards by 0.009mm, the rotation speed of the cutter 10 is about 28000r/min, the total feeding depth is 0.64mm, so that a pre-processing hole position is obtained, and a rough trimming allowance of a single side with 0.085mm is left;

the second step is that: after the pre-hole position is opened, the rough trimming section 111 is directly used for carrying out outline reaming rough trimming and polishing operation without lifting a cutter, the process parameters are 25mm/min of feeding speed at the moment, the rotating speed of a polishing cutter 10 is about 28000r/min, the rough trimming and polishing operation is finished, and a finishing allowance of 0.02m on a single side is reserved;

the third step: as shown in fig. 4 and 5, after rough trimming and polishing, the tool 10 is retracted to the center of the hole without lifting the tool, the transition section vertically penetrates through the through hole downwards at this time, so that the outer peripheral surface of the finishing section 131 is attached to the inner side surface of the hole wall, finishing polishing and chamfering are performed, the processing parameters are about 28000r/min of the rotating speed of the tool 10, the feeding speed is 30mm/min, the tool is fed to finish trimming and polishing the hole wall, the final size of the hole is obtained, then the tool 10 is retracted to the center of the hole and lifted to a safe height, namely, the processing of a micropore with the diameter of 0.7mm is completed, and the total processing time is about 32s.

Above-mentioned a cutter 10 for apron processing, because the outside diameter size of punching open thick section 110 and the finish machining hole end of polishing should not be too big or undersize, too big can lead to punching open thick section 110 and can't carry out the trompil with the mode of screw feed, undersize can lead to cutter 10's intensity and rigidity not enough, through design first changeover portion 120 in hole processing portion 100 and connect punching open thick section 110 and finish machining hole section of polishing 130, and the surface of punching open thick section 110 and the surface of finish machining hole section of polishing 130 cover the diamond-impregnated sand layer of same model, make punching open between thick section 110 and the finish machining hole section of polishing 130 need not to cut off through separating sand section 320, only need through first changeover portion 120 connect can, the problem that separates Kong Beng or the hole that sand section 320 accumulation float sand and lead to can not appear and split, make the processing of apron glass 60 obtain promoting, reduce cost. And can guarantee to punch and open thick section 110 and the external diameter size of finishing hole section 130 of polishing is suitable, can guarantee to punch and open thick section 110 and can punch with the mode of screw feed, also can guarantee the intensity of cutter 10 and reduce the possibility of desanding, and it is shorter to punch and open thick section 110's length, make the rigidity of punching and opening thick section 110 better, can prolong the life of cutter 10, reduce the number of times of tool changing, avoid because the tool changing leads to product quality to reduce, make production efficiency promote.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, the technical features should be considered as the scope of the present description.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A tool for machining a cover plate, comprising:

a main shaft controlled to be rotatable around its own axis direction;

the hole machining part is matched and connected with one end of the main shaft along the axial direction of the main shaft, and points to the direction of the main shaft from the hole machining part, and the hole machining part comprises a punching rough section, a first transition section and a finishing hole grinding section which are coaxially connected in sequence;

the punching rough section comprises a rough trimming section, the finishing hole polishing section comprises a finishing section, the outer diameter of the rough trimming section is larger than that of the finishing section, and the outer diameter of the first transition section is larger than that of the rough trimming section.

2. The tool according to claim 1, wherein the hole-piercing-roughening section further comprises a hole-piercing section provided at a bottom of the rough-finished section, and an outer diameter of the hole-piercing section is gradually reduced and converged at a point in a direction from the main axis toward the hole-forming portion.

3. The tool according to claim 1 or 2, wherein the finishing hole-grinding section includes a first chamfer section and a second chamfer section provided at axially opposite ends of the finishing section along the spindle, and an outer diameter of the first chamfer section gradually decreases and an outer diameter of the second chamfer section gradually increases in a direction from the spindle toward the hole-machining portion.

4. The tool according to claim 1, wherein the outer surfaces of the rough perforated section and the fine perforated section are covered with a first layer of diamond grit.

5. The tool according to claim 1, further comprising a contour machining portion and a first transition portion, one end of the contour machining portion being coupled to the spindle, the other end of the contour machining portion being coupled to the hole machining portion through the first transition portion.

6. The tool according to claim 5, wherein the contour machining portion includes a rough contour polishing section, a fine contour polishing section, and a semi-fine contour polishing section coaxially arranged in this order in a direction from the spindle toward the hole machining portion.

7. The tool according to claim 6, wherein a sand separation section for separating the rough-outer-shape polishing section from the fine-outer-shape polishing section is arranged between the rough-outer-shape polishing section and the fine-outer-shape polishing section, the outer diameter of the sand separation section is smaller than the outer diameter of the rough-outer-shape polishing section and the outer diameter of the fine-outer-shape polishing section, a second diamond sand layer covers the outer surface of the rough-outer-shape polishing section, a third diamond sand layer covers the outer surfaces of the fine-outer-shape polishing section and the semi-fine-outer-shape polishing section, and the mesh number of the second diamond sand layer is smaller than the mesh number of the third diamond sand layer.

8. The tool according to claim 5, wherein the first transition portion includes a second transition section and a third transition section which are coaxially connected in this order in a direction in which the main axis points to the hole machining portion;

wherein, in the direction that the main shaft points to the hole machining part, the outer diameter of the second transition section is gradually reduced, and the outer diameter of the third transition section is equal to the outer diameter of one end of the second transition section close to the third transition section.

9. The tool according to claim 5, further comprising a second transition portion, opposite ends of which connect the spindle and the profile machining portion, respectively.

10. The tool according to claim 9, wherein the second transition portion is provided with a positioning line surrounding the second transition portion in a circumferential direction of the second transition portion, and the positioning line is used for providing a reference for a mounting height of the tool during machining.

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