A replaceable multi-layer PCD disc cutter

Abstract

A replaceable position multi-layer PCD disc cutter comprises a cutter handle 1, a positioning shaft 13 integrally formed at one end of the cutter handle, a cutter disc four 6, a positioning sleeve three 9, a cutter disc three 5, a positioning sleeve two 8, a cutter disc two 4, a positioning sleeve one 7, a cutter disc one 3 and an end face shrinkage seat ring 3 fixedly installed on the positioning shaft in sequence, and an end face shrinkage bolt 10 installed between the end face shrinkage seat ring and the positioning shaft. The cutter discs are all left-right double blade edges, the cutter disc one and the cutter disc four are the same in shape and size and can be replaced, the cutter disc two and the cutter disc three are the same in shape and size and can be replaced, and the positioning sleeve one and the positioning sleeve three are the same in shape and size. The cutting teeth of the cutter discs are all of unequal division structure, i.e. the included angles between each cutting tooth are different, and the cutting teeth are fixedly installed with PCD cutter grains at the end portions. In the application, the four-layer disc cutter is of split type and left-right double blade edge, the cutter disc one and the cutter disc four are replaced, the cutter disc two and the cutter disc three are replaced and assembled after the service life of the cutter disc, the machining efficiency is high, and the tool use cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of superhard cutting tools, and in particular to an exchangeable multi-layer PCD disc cutter. Background Art

[0002] PCD tools offer high hardness, high compressive strength, excellent thermal conductivity, and wear resistance, enabling high precision and efficiency in high-speed cutting. PCD's hardness can reach 8,000 HV, 8 to 12 times that of cemented carbide. Its thermal conductivity is 700 W / mK, 1.5 to 9 times that of cemented carbide and even higher than PCBN and copper, resulting in rapid heat transfer. PCD's coefficient of friction is generally only 0.1 to 0.3 (compared to 0.4 to 1 for cemented carbide), significantly reducing cutting forces. PCD's coefficient of thermal expansion is only 0.9 to 1.18 × 10-6, only one-fifth that of cemented carbide, resulting in minimal thermal deformation and high precision. PCD tools also exhibit minimal affinity for nonferrous and non-metallic materials, preventing chips from adhering to the tool tip and forming built-up edge during machining. When using PCD tools to machine metal-matrix composites, failure occurs primarily through adhesive wear and microscopic intergranular cracks caused by diamond grain defects. Adhesive wear is less pronounced when machining high-hardness, high-brittle materials. Conversely, tool wear increases when machining less brittle materials (such as carbon fiber reinforced materials), with adhesive wear playing a dominant role. Therefore, adequate tool cooling plays a role in reducing wear.

[0003] In the prior art, PCD tools for machining the upper and lower ears of automobile steering knuckle brackets use a long and short PCD double-layer cutterhead, which can only machine one side ear of the automobile steering knuckle bracket at a time. Therefore, the PCD cutterhead used in the prior art must be used in two steps to machine the two ears on the same side of the same workpiece. After machining one side ear of the automobile steering knuckle bracket, the relative position between the cutter and the workpiece needs to be readjusted before machining the other side ear of the automobile steering knuckle bracket. This results in low machining efficiency, a more complex fixture structure for fixing the cutter and the workpiece, and low machining accuracy. In addition, the cutterhead and the tool holder are integral and cannot be disassembled, and the cutterhead and tool cannot be replaced. Once the cutterhead is worn, the entire tool needs to be sent back to the manufacturer for replacement and grinding, resulting in high tool manufacturing and use costs.

[0004] Moreover, in the prior art, the cutting teeth of the cutter disc adopt an equally divided structure, that is, the angles between the cutting teeth of the cutter disc are the same, which easily causes the blade to vibrate, thereby affecting the service life of the cutter disc. Summary of the Invention

[0005] The present application provides a replaceable multi-layer PCD disc cutter to solve the problems in the prior art that the cutter disc and the tool holder of the PCD cutter are integral and inseparable, resulting in low processing efficiency and high tool manufacturing and use costs.

[0006] The technical solutions adopted in this application are as follows:

[0007] A replaceable multi-layer PCD disc cutter comprises a tool holder, a positioning shaft is integrally formed at one end of the tool holder, a cutter disc four, a positioning sleeve three, a cutter disc three, a positioning sleeve two, a cutter disc two, a positioning sleeve one, a cutter disc one and an end face tightening seat ring are fixedly installed in sequence in a colinear manner on the positioning shaft, an end face tightening bolt is installed between the end face tightening seat ring and the positioning shaft to press and fix the various parts of the above-mentioned cutter disc and the positioning sleeve; the cutter discs all have left and right double-edge structures, wherein the cutter disc one and the cutter disc four have the same shape and size and can be interchanged, the cutter disc two and the cutter disc three have the same shape and size and can be interchanged, and the positioning sleeve one and the positioning sleeve three have the same shape and size; the cutting teeth of the cutter disc all adopt an unequal structure, that is, the angles between each cutting tooth are different, and PCD cutting particles are fixedly installed at the ends of the cutting teeth.

[0008] The positioning sleeve and the cutter disc are fixedly connected to the positioning shaft in the axial direction via a transmission key, and the transmission key and the positioning shaft are fixedly connected via a tightening screw.

[0009] A top screw is also installed between the transmission key and the positioning shaft.

[0010] The position of each cutter disc mounted on the positioning shaft is provided with a positioning shaft water guide groove, and each cutter disc is provided with a cutter disc water guide groove corresponding to the position of the positioning shaft water guide groove to guide cooling water to flow to the blade.

[0011] The positioning shaft water guide grooves provided on the portion of the positioning shaft where the cutter disc is installed are also connected to each other through a plurality of inclined holes.

[0012] Each of the cutter discs comprises a cutter disc base, a cutter disc keyway for mounting the transmission key is provided in a positioning shaft mounting hole on the cutter disc base, and the PCD cutting grains are fixedly mounted on the cutting tooth ends of the cutter disc base.

[0013] Each of the cutter discs has cutting edges on the left and right sides, and 6 PCD cutting grains are evenly installed on each cutting edge, comprising a total of 12 PCD cutting grains.

[0014] Each of the positioning sleeves comprises a positioning sleeve base, and a positioning sleeve keyway for mounting the transmission key is provided on the positioning shaft mounting hole on the positioning sleeve base.

[0015] The shape of each positioning sleeve is a hollow cylinder, and each positioning sleeve is fixedly sleeved on the positioning shaft by using clearance fit.

[0016] The end face tightening seat ring is cylindrical, and a countersunk hole for installing the end face tightening bolt is opened in the central axial direction of the end face tightening seat ring.

[0017] The beneficial effects of adopting the technical solution of this application are as follows:

[0018] 1. The PCD four-layer disc cutter in this application is a split type with double-edged design on both sides. When the cutter disc reaches the end of its service life after the first assembly, the cutter disc one and the cutter disc four are swapped, and the cutter disc two and the cutter disc three are swapped for a second assembly, and the cutting edge on the other side of the cutter disc is used, thereby extending the tool life by at least twice and improving the processing efficiency by at least twice. The cutter disc swap design has an ingenious structure, simple assembly and high processing precision.

[0019] 2. Repeated assembly and swap assembly runout can be guaranteed to be within 0.02mm, saving the time and cost of replacing and remaking the cutter disc, more than doubling the life of a single cutter disc, and improving the overall efficiency by 70%, greatly reducing the cost of tool use.

[0020] 3. The positioning shaft water guide groove is connected to the cutter disc water guide groove on the split cutter disc, and the positioning shaft water guide grooves are also connected to each other through a structural design of a plurality of inclined holes, so as to guide the cooling water from the positioning shaft to the cutting edge of the cutter disc, so that the tool cooling is more uniform and more sufficient.

[0021] 4. The single cutter disc adopts an unequal teeth structure design, which reduces the risk of tool chattering. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the PCD four-layer interchangeable disc cutter in this application;

[0024] Figure 2 for Figure 1 Left view of;

[0025] Figure 3 This is a schematic structural diagram of the integrated knife handle in this application;

[0026] Figure 4 This is a schematic diagram of the structure of the cutter head in this application;

[0027] Figure 5 This is a schematic diagram of the structure of the positioning sleeve in this application;

[0028] Figure 6 This is a schematic diagram of the structure of the end face tightening seat ring in this application;

[0029] Figure 7 A schematic diagram of the structure of a workpiece processed using a PCD disc cutter in the prior art;

[0030] Figure 8 This is a schematic diagram of the structure of using the PCD four-layer disc cutter in this application to process a workpiece;

[0031] Illustration:

[0032] Among them, 1- tool handle, 2- end face tightening seat ring, 3- cutter disc one, 4- cutter disc two, 5- cutter disc three, 6- cutter disc four, 7- positioning sleeve one, 8- positioning sleeve two, 9- positioning sleeve three, 10- end face tightening bolt, 11- positioning shaft water guide groove, 12- transmission key, 13- positioning shaft, 14- top screw, 15- tightening screw, 16- PCD tool grain, 17- cutter disc base, 18- cutter disc keyway, 19- positioning sleeve base, 20- positioning sleeve keyway, 21- workpiece. DETAILED DESCRIPTION

[0033] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0034] See also Figure 1 and 2 , which is a structural diagram of the PCD interchangeable four-layer disc cutter in this application.

[0035] The present application provides a replaceable multi-layer PCD disc cutter, including a tool handle 1, with a positioning shaft 13 integrally formed at one end of the tool handle 1. The tool handle 1 in the present application adopts a BT40 tool handle. The positioning shaft 13 is fixedly installed in sequence on the same line with a cutter disc 4 6, a positioning sleeve 3 9, a cutter disc 3 5, a positioning sleeve 2 8, a cutter disc 2 4, a positioning sleeve 1 7, a cutter disc 1 3 and an end face tightening seat ring 2. An end face tightening bolt 10 is installed between the end face tightening seat ring 2 and the positioning shaft 13 to tighten and fix the above-mentioned cutter disc and positioning sleeve parts. Figure 7 As shown, in the prior art, two cutter discs, one long and one short, are used to process the ears on both sides of the automobile steering knuckle bracket twice, wherein the long cutter disc processes the left ear and the short cutter disc processes the right ear; Figure 8As shown, in the present application, cutter disc 1 3 and cutter disc 4 6 are relatively short cutter discs, and cutter disc 2 4 and cutter disc 3 5 are relatively long cutter discs. In the present application, four layers of cutter discs, one long and one short, are combined in pairs to simultaneously complete the processing of the ears on both sides of the automobile steering knuckle bracket. There is no need to readjust the relative position between the tool and the workpiece 21. Only one processing is required to form the workpiece, and the processing efficiency is high.

[0036] The cutter discs are all left and right double-edge structures, wherein the cutter disc 1 3 and the cutter disc 4 6 have the same shape and size and can be swapped, the cutter disc 2 4 and the cutter disc 3 5 have the same shape and size and can be swapped, and the positioning sleeve 1 7 and the positioning sleeve 3 9 have the same shape and size. When the cutter disc reaches the end of its service life after the first assembly, the cutter disc 1 and the cutter disc 4 are swapped, and the cutter disc 2 and the cutter disc 3 are swapped for a second assembly, and the other side edge of each cutter disc is used, thereby extending the tool life by at least twice; the cutting teeth of the cutter disc all adopt an unequal structure, that is, the angles between each cutting tooth are different, and the PCD blade grains 16 are fixedly installed on the ends of the cutting teeth. The unequal design of the cutter disc cutting teeth greatly reduces the risk of tool chattering, and overcomes the problem of easy chattering of the cutter disc cutting teeth in the prior art using an equal design.

[0037] The positioning sleeve and the cutter disc are fixedly connected to the positioning shaft 13 in the axial direction via a transmission key 12 , and the transmission key 12 and the positioning shaft 13 are fixedly connected via a tightening screw 15 .

[0038] A top screw 14 is installed between the transmission key 12 and the positioning shaft 13 .

[0039] like Figure 3 As shown, the cutter disc 1 3, the positioning sleeve 1 7, the cutter disc 2 4 and one end of the positioning sleeve 2 8 are fixedly connected by the transmission key 12, the tightening screw 15 and the top screw 14, and the cutter disc 3 5, the positioning sleeve 3 9, the cutter disc 4 6 and the other end of the positioning sleeve 2 8 are also fixedly connected by the transmission key 12, the tightening screw 15 and the top screw 14. Repeated assembly and swap assembly runout can be guaranteed to be within 0.02 mm, with a simple structure, reliable connection and high assembly precision.

[0040] like Figure 3 As shown, the portion of the positioning shaft 13 where each of the cutter discs is installed is provided with a positioning shaft water guide groove 11, and each of the cutter discs is provided with a cutter disc water guide groove corresponding to the position of the positioning shaft water guide groove 11, which guides the cooling water to flow to the cutting edge, thereby avoiding overheating of the cutting edge during machining of the workpiece and causing wear, thereby extending the service life of the cutting edge.

[0041] like Figure 3As shown, the positioning shaft water guide grooves 11 provided on the position of the positioning shaft 13 where the cutter disc is installed are also connected to each other through a plurality of inclined holes, so that the cooling from the positioning shaft 13 to each of the cutter disc blades is more sufficient and uniform.

[0042] like Figure 4 As shown, each of the cutter discs includes a cutter disc base 17, a cutter disc keyway 18 for installing the transmission key 12 is opened in the positioning shaft mounting hole on the cutter disc base 17, and the PCD cutting grain 16 is fixedly installed on the cutting tooth end of the cutter disc base 17, which can meet the needs of superhard cutting finishing.

[0043] like Figure 4 As shown, each of the cutter discs has a cutting edge on the left and right. In this embodiment, 6 PCD blade grains 16 are evenly installed on each of the cutting edges, including a total of 12 PCD blade grains 16. The cutting teeth of the cutter disc adopt an unequal design, that is, the angles between adjacent cutting teeth are not all 30°, but vary around 30°, avoiding resonance, reducing the risk of tool vibration, extending the tool life to a certain extent, and high processing accuracy.

[0044] like Figure 5 As shown, each positioning sleeve includes a positioning sleeve base 19. In this embodiment, the positioning shaft mounting hole on the positioning sleeve base 19 is provided with two positioning sleeve key slots 20 for mounting the transmission key 12. The structure is simple and easy to assemble.

[0045] The shape of each positioning sleeve is a hollow cylinder. Each positioning sleeve is fixedly sleeved on the positioning shaft 13 by a clearance fit, can be repeatedly installed, and has high assembly precision.

[0046] like Figure 6 As shown, the end face tightening seat ring 2 is cylindrical, and a countersunk hole for installing the end face tightening bolt 10 is opened in the central axial direction of the end face tightening seat ring 2. The structure is simple and easy to disassemble and reassemble.

[0047] The installation and working process of a replaceable multi-layer PCD disc cutter provided in this application: When assembling the cutter disc in this application, assemble the various parts of the cutter disc from right to left, such as Figure 1As shown, the cutter disc four 6, the positioning sleeve three 9, the cutter disc three 5, the positioning sleeve two 8, the cutter disc two 4, the positioning sleeve one 7, the cutter disc one 3 and the end face tightening seat ring 2 are fixedly installed in sequence on the positioning shaft 13 in a colinear manner, wherein the width between the right edge of the cutter disc one 3 and the left edge of the cutter disc two 4 is the width of the side ear of the automobile steering knuckle bracket, the width between the right edge of the cutter disc three 5 and the left edge of the cutter disc four 6 is also the width of the side ear of the automobile steering knuckle bracket, the width between the left edge of the cutter disc two 4 and the right edge of the cutter disc three 5 is the width between the left and right ears of the automobile steering knuckle bracket, and the cutter disc one 3 is the width between the left and right ears of the automobile steering knuckle bracket. The disc one 3, the positioning sleeve one 7, the cutter disc two 4 and one end of the positioning sleeve two 8 are fixedly connected by the transmission key 12, the tightening screw 15 and the top screw 14. The cutter disc three 5, the positioning sleeve three 9, the cutter disc four 6 and the other end of the positioning sleeve two 8 are also fixedly connected by the transmission key 12, the tightening screw 15 and the top screw 14. Finally, the end face tightening bolt 10 is installed in the countersunk hole in the center of the end face tightening seat ring 2 to fix the end face tightening seat ring 2 and the positioning shaft 13. The end face tightening bolt 10 is used to press the positioning surfaces of the above-mentioned cutter disc and positioning sleeve parts to ensure assembly accuracy.

[0048] Each of the cutter discs has a left and right double-edge structure. During the initial processing, the right edges of the cutter discs 1 3 and 3 5, and the left edges of the cutter discs 2 4 and 4 6 are used. The ears on both sides of the automobile steering knuckle bracket are processed simultaneously by the right edge of the cutter disc 1 3 and the left edge of the cutter disc 2 4, the right edge of the cutter disc 3 5 and the left edge of the cutter disc 4 6, and the forming can be completed in one processing. When the life of the single-sided cutting edge of the tool is reached, that is, the right side cutting edges of the cutter disc 1 3 and the cutter disc 3 5, and the left side cutting edges of the cutter disc 2 4 and the cutter disc 4 6 in this embodiment are reached, the cutter disc 1 3 and the cutter disc 4 6 can be directly swapped, and the cutter disc 2 4 and the cutter disc 3 5 can be directly swapped and reinstalled, and the left side cutting edges of the cutter disc 1 3 and the cutter disc 3 5, and the right side cutting edges of the cutter disc 2 4 and the cutter disc 4 6 can be used. The width between the right side cutting edge of the cutter disc 4 6 and the left side cutting edge of the cutter disc 3 5 is the width of the side ear of the automobile steering knuckle bracket, and the width between the right side cutting edge of the cutter disc 2 4 and the left side cutting edge of the cutter disc 1 3 is also the width of the automobile steering knuckle bracket. The width of the side ear of the car steering knuckle bracket, the width between the left edge of the cutter disc 3 5 and the right edge of the cutter disc 2 4 is the width between the left and right ears of the car steering knuckle bracket. After repeated assembly and swapping, the radial runout and axial runout are guaranteed to be within 0.02mm, that is, the right edge of the cutter disc 4 6 and the left edge of the cutter disc 3 5, the right edge of the cutter disc 2 4 and the left edge of the cutter disc 1 3 are respectively and simultaneously processed on both sides of the car steering knuckle bracket, thereby doubling the theoretical life of the cutter disc. If a single cutter disc is damaged and needs to be replaced, it can be directly disassembled and replaced without replacing the entire tool. In addition, the cutter disc in this embodiment adopts a 12-tooth unequally divided structure design, which improves processing efficiency while preventing the occurrence of tool vibration.

[0049] The PCD four-layer disc cutter in this application adopts a split design with double cutting edges on both sides. When the disc reaches its service life after the first assembly, the disc one and the disc four are directly swapped, and the disc two and the disc three are swapped for a second assembly. The cutting edge on the other side of each disc is used, thereby extending the tool life by at least twice, and improving the processing efficiency by at least twice. The disc swapping design is ingenious, simple to assemble, and has high processing precision. In addition, the four-layer discs, one long and one short, are used in pairs to simultaneously complete the processing of the ears on both sides of the automobile steering knuckle bracket. There is no need to readjust the relative position between the tool and the workpiece. Only one processing is required to form the workpiece, which has high processing efficiency. This overcomes the problem in the prior art of using two discs, one long and one short, to process the ears on both sides of the automobile steering knuckle bracket in two times, which has low processing efficiency and processing precision, and the required tool fixtures are complex, and the tool can only be replaced as a whole, which is costly. The connecting components used in this application, such as positioning sleeves, end face tightening rings, transmission keys, tightening screws, and top screws, can meet the requirements of repeated assembly, and the repeated assembly and adjustment assembly runout can be guaranteed to be within 0.02mm, saving the time and cost of replacing and remaking the cutter disc, increasing the life of a single cutter disc by more than double, and improving the overall efficiency by 70%, greatly reducing the cost of tool use.

[0050] In this application, the positioning shaft water guide groove is connected to the cutter disc water guide groove on the split cutter disc, and the positioning shaft water guide grooves are also connected to each other through a structural design of several inclined holes, which guides cooling water from the positioning shaft to the blade of the cutter disc, making the tool cooling more evenly and more fully, reducing the wear caused by overheating of the tool, and the cooling structure design is exquisite.

[0051] In the present application, each of the cutter discs adopts a structural design of unequal teeth, which reduces the risk of tool chattering and overcomes the problem in the prior art that the cutter disc cutting teeth adopt an equally divided design that is prone to resonance and tool chattering.

[0052] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A replaceable multi-layer PCD disc cutter, characterized in that: The present invention comprises a tool handle (1), wherein a positioning shaft (13) is integrally formed at one end of the tool handle (1), and a cutter disc 4 (6), a positioning sleeve 3 (9), a cutter disc 3 (5), a positioning sleeve 2 (8), a cutter disc 2 (4), a positioning sleeve 1 (7), a cutter disc 1 (3) and an end face tightening seat ring (2) are fixedly installed on the positioning shaft (13) in sequence and in a colinear manner, and an end face tightening bolt (10) is installed between the end face tightening seat ring (2) and the positioning shaft (13) to press and tighten the cutter disc 4 (6), the positioning sleeve 3 (9), the cutter disc 3 (5), the positioning sleeve 2 (8), the cutter disc 2 (4), the positioning sleeve 1 (7) and the cutter disc 1 (3) The cutter disc 4 (6), cutter disc 3 (5), cutter disc 2 (4) and cutter disc 1 (3) are all double-edged structures, wherein the cutter disc 1 (3) and the cutter disc 4 (6) are of the same shape and size and can be swapped, the cutter disc 2 (4) and the cutter disc 3 (5) are of the same shape and size and can be swapped, and the positioning sleeve 1 (7) and the positioning sleeve 3 (9) are of the same shape and size; the cutting teeth of the cutter disc 4 (6), cutter disc 3 (5), cutter disc 2 (4) and cutter disc 1 (3) all adopt an unequal structure, that is, the angles between each of the cutting teeth are different, and the ends of the cutting teeth are fixedly mounted with PCD blade grains (16); The cutter disc 4 (6), cutter disc 3 (5), cutter disc 2 (4), and cutter disc 1 (3) all have cutting edges on the left and right sides, and 6 PCD cutting grains (16) are evenly installed on each cutting edge, comprising a total of 12 PCD cutting grains (16); The positions of the positioning shaft (13) where the cutter disc 4 (6), cutter disc 3 (5), cutter disc 2 (4) and cutter disc 1 (3) are mounted are all provided with positioning shaft water guide grooves (11), and the cutter disc 4 (6), cutter disc 3 (5), cutter disc 2 (4) and cutter disc 1 (3) are all provided with cutter disc water guide grooves corresponding to the positions of the positioning shaft water guide grooves (11) to guide cooling water to flow toward the blades; The positioning shaft water guide grooves (11) provided on the portion of the positioning shaft (13) where the cutter disc is mounted are also connected to each other via a plurality of inclined holes.

2. The replaceable multi-layer PCD disc cutter according to claim 1, characterized in that: Positioning sleeve three (9), positioning sleeve two (8), positioning sleeve one (7) and cutter disc four (6), cutter disc three (5), cutter disc two (4), cutter disc one (3) are fixedly connected to the positioning shaft (13) in the axial direction through a transmission key (12), and the transmission key (12) and the positioning shaft (13) are fixedly connected through a tightening screw (15).

3. The replaceable multi-layer PCD disc cutter according to claim 2, characterized in that: A top screw (14) is also installed between the transmission key (12) and the positioning shaft (13).

4. The replaceable multi-layer PCD disc cutter according to claim 3, characterized in that: Cutter disc four (6), cutter disc three (5), cutter disc two (4), and cutter disc one (3) all include a cutter disc base (17), a cutter disc keyway (18) for mounting the transmission key (12) is provided in a positioning shaft mounting hole on the cutter disc base (17), and the PCD blade grain (16) is fixedly mounted on the cutting tooth end of the cutter disc base (17).

5. The replaceable multi-layer PCD disc cutter according to claim 2, characterized in that: The positioning sleeve three (9), the positioning sleeve two (8), and the positioning sleeve one (7) all include a positioning sleeve base (19), and a positioning sleeve keyway (20) for mounting the transmission key (12) is provided on the positioning shaft mounting hole on the positioning sleeve base (19).

6. The replaceable multi-layer PCD disc cutter according to claim 1, characterized in that: The positioning sleeve three (9), the positioning sleeve two (8), and the positioning sleeve one (7) are all hollow cylindrical in shape. The positioning sleeve three (9), the positioning sleeve two (8), and the positioning sleeve one (7) are all fixedly sleeved on the positioning shaft (13) by using clearance fit.

7. The replaceable multi-layer PCD disc cutter according to claim 1, characterized in that: The end face tightening seat ring (2) is cylindrical, and a countersunk hole for installing the end face tightening bolt (10) is provided in the central axial direction of the end face tightening seat ring (2).

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