Circular saw blade, method for manufacturing circular saw blade, and method for attaching and detaching circular saw blade

Abstract

The invention discloses a circular saw blade, a manufacturing method of the circular saw blade and a dismounting and mounting method of the circular saw blade. The circular saw blade comprises a circular saw disc and parallelogram tool bits evenly distributed on the circumference, the third side face and the first side face of each tool bit are of an obtuse angle structure, the second side face and the third side face of each tool bit are provided with installation grooves in interference fit with protrusions of installation grooves of the tool bits of the saw disc, and the fourth side face makes contact with the saw disc to enhance stability. The tool bit is made of special hard alloy powder (72%-78% of WC, 5%-8% of TiC, 8%-12% of TaC and 6%-10% of Co) through cold pressing sintering and precise grinding, and the saw disc is subjected to salt bath quenching, high-temperature tempering and oxidation black coating treatment. According to the special disassembling and assembling tool, quick replacement of the tool bit is achieved through the lever principle of double cylindrical pins, and during operation, the insertion hole and the strip-shaped groove are used as fulcrums to complete sliding positioning of assembling / disassembling. The high-precision metal cutting device has excellent cutting performance, high structural stability and convenient maintainability, and is particularly suitable for the field of high-precision metal machining.

Description

Technical Field

[0001] This application relates to the technical field of sawing tools, and in particular to a circular saw blade, a manufacturing method thereof, and a disassembly and assembly method thereof. Background Art

[0002] A circular saw blade has an outer peripheral cutting edge (saw teeth) and is a basic cutting tool for sawing, slicing, grooving, and related processing. According to the different tool materials and cutting edge fixing methods, commercially available circular saw blades can be divided into two categories: (1) integral tools made of high-speed steel or cemented carbide; (2) composite tools composed of a tool steel substrate (as the tool body) and welded cemented carbide cutting heads. Both types of circular saw blades can be used for wood and metal cutting.

[0003] When the cutting edge is worn or damaged to the extent that it can no longer be sharpened, the circular saw blade must be replaced as a whole. Therefore, Chinese Patent, Publication No.: CN103465383B, Publication Date: September 30, 2015, discloses a circular saw blade with detachable cutting heads, including a saw blade circular saw disc, a cutting head connecting block body, and a cutting head. A plurality of water grooves are evenly distributed along the circumference of the circular saw disc. The water grooves have an arc bottom, and a circular saw disc connecting half groove is provided on the side wall of the water groove; the cutting head connecting block body is placed in the water groove, and a block body connecting half groove is provided on the side wall of the cutting head connecting block body. The circular saw disc connecting half groove and the block body connecting half groove are combined into a hole, and a connecting bolt passes through the hole to fixedly connect the cutting head connecting block body and the circular saw disc. The cutting head is fixedly connected to the cutting head connecting block body through a cutting head fixing bolt; all the cutting heads are located on the same side of the cutting head connecting block body. Square grooves for engaging the side walls of the water grooves are further provided on the side walls on both sides of the cutting head connecting block body.

[0004] The disadvantages of the above technical solution are as follows: It is necessary to connect the cutting head connecting block body and the circular saw disc through a connecting bolt, and connect the cutting head fixing bolt and the cutting head connecting block body through a cutting head fixing bolt. Since a circular saw blade has many cutting heads, the above structure is troublesome to disassemble and install the cutting heads. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the purpose of this application is to provide a circular saw blade, a manufacturing method thereof, and a disassembly and assembly method thereof, which can facilitate the disassembly and assembly of the circular saw disc and the cutting head of the circular saw blade.

[0006] To achieve the above purpose, the following technical solutions are adopted in this application: The present application provides a circular saw blade, which includes a disc-shaped circular saw plate and a plurality of cutting heads installed on the circumference of the circular saw plate. The cutting heads are basically parallelogram-shaped. The cutting head includes a first side provided with a cutting edge. The two sides adjacent to the first side on the cutting head are the second side and the third side. Among them, the included angle between the third side and the first side is an obtuse angle. Both the second side and the third side are provided with mounting grooves for mounting and cooperating with the circular saw plate; a plurality of cutting head mounting grooves are evenly distributed along the circumference of the circular saw plate. The cutting head mounting grooves are provided with mounting protrusions on the two groove walls corresponding to the second side and the third side. The mounting protrusions are in interference fit with the corresponding mounting grooves. The side of the cutting head opposite to the first side is the fourth side, and the circular saw plate is at least partially in contact with the fourth side.

[0007] As a preferred technical solution, a butting groove is provided at the corner of the first side and the second side of the cutting head, and a jack is provided on one side of the cutting head mounting groove of the circular saw plate.

[0008] As a preferred technical solution, a protrusion is provided on the second side of the cutting head near the butting groove.

[0009] As a preferred technical solution, a strip-shaped groove communicating with the cutting head mounting groove is provided at the bottom of the cutting head mounting groove of the circular saw plate.

[0010] As a preferred technical solution, a concave stepped portion is provided on the fourth side of the cutting head near the third side.

[0011] As a preferred technical solution, a chip removal groove is provided on the first side of the cutting head along the length direction of the cutting edge.

[0012] As a preferred technical solution, the circular saw plate includes a front side and a rear side, and the chip removal grooves of adjacent two cutting heads are respectively close to the front side and the rear side.

[0013] The present application also provides a manufacturing method of the above circular saw blade, and the manufacturing method includes: Step A, manufacturing the cutting head by the following method: Step A1, preparing tungsten carbide with a mass fraction of 72-78%, titanium carbide with a mass fraction of 5-8%, tantalum carbide with a mass fraction of 8-12% and cobalt powder with a mass fraction of 6-10% and mixing them, and cold pressing and compacting in a mold to form a green body; Step A2, further sintering the green body through a liquid phase sintering mechanism to form a blank; Step A3, using a diamond grinding wheel to perform profile grinding on the blank to generate the designed geometric shape and size. Step B: The circular saw blade is manufactured by the following method: Step B1, the steel plate is quenched in a salt bath and then tempered at a high temperature above 560 °C to improve its hardness and toughness simultaneously; Step B2, after heat treatment, the steel plate is surface ground to achieve the required thickness and flatness; Step B3, profiling is carried out by numerical control machining to produce the designed geometric shape and dimensions, obtaining a semi-finished product after processing; Step B4, the semi-finished product after processing is finally subjected to surface treatment with an oxide black coating.

[0014] As a preferred technical solution, in Step A1, the mass fraction of the powder is preferably 75.8% tungsten carbide, 6.2% titanium carbide, 10% tantalum carbide, and 8% cobalt powder.

[0015] This application also provides a method for disassembling and assembling a circular saw blade. The disassembling and assembling method includes the installation method of the cutting head and the circular saw blade: Step C, use a disassembly and assembly tool to install each cutting head onto the corresponding cutting head installation groove on the circular saw blade. The disassembly and assembly tool includes a handle and a first cylindrical pin and a second cylindrical pin fixed at the end of the handle: Step C1, insert the first cylindrical pin into the jack on one side of the cutting head installation groove, and press the second cylindrical pin against the abutment groove of the cutting head; Step C2, with the first cylindrical pin as the rotation axis, rotate and press down the second cylindrical pin, and the installation grooves on the second side and the third side of the cutting head slide along the corresponding two installation protrusions on the groove wall of the cutting head installation groove respectively; Step C3, until the fourth side of the cutting head contacts the circular saw blade, the installation of the cutting head and the circular saw blade is completed; The disassembling and assembling method includes the disassembly method of the cutting head and the circular saw blade: Step D, use a disassembly and assembly tool to disassemble each cutting head from the corresponding cutting head installation groove on the circular saw blade: Step D1, insert the first cylindrical pin into the strip-shaped groove, and press the second cylindrical pin against the circumference of the circular saw blade; Step D2, with the second cylindrical pin as the fulcrum, lift the first cylindrical pin, and the installation grooves on the second side and the third side of the cutting head slide along the corresponding two installation protrusions on the groove wall of the cutting head installation groove respectively; Step D3, until the cutting head completely disengages from the cutting head installation groove, the disassembly of the cutting head and the circular saw blade is completed.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: For the circular saw blade of this application, there is no need for connecting parts such as connecting bolts to connect the cutting head and the circular saw blade, which facilitates the disassembly and assembly of the cutting head and the circular saw blade, and thus facilitates the replacement of the cutting head. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the circular saw blade of this application; Figure 2 It is a schematic structural diagram of the cutting head of this application; Figure 3 It is a top view of the cutting head of this application; Figure 4 It is a front view of the cutting head of this application; Figure 5 For Figure 1 The partial enlarged view at position A in Figure 6 The schematic installation structure diagram of the tool head and the circular saw blade of the present application; Figure 7 The schematic disassembly structure diagram of the tool head and the circular saw blade of the present application; Wherein: 1. Circular saw blade; 11. Circular saw disk; 111. Tool head installation groove; 112. Jack; 113. Strip-shaped groove; 12. Tool head; 121. First side surface; 122. Second side surface; 123. Third side surface; 124. Fourth side surface; 125. Installation groove; 126. Chip removal groove; 127. Abuttment groove; 128. Protrusion; 129. Step portion; 21. Handle; 22. First cylindrical pin; 23. Second cylindrical pin. Detailed implementation manners

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific implementation manners of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the implementation manners of the present application.

[0019] As Figure 1 shown, the present application provides a circular saw blade 1, which includes a disk-shaped circular saw disk 11 and a plurality of tool heads 12 installed on the circumference of the circular saw disk 11. The nominal diameter of the circular saw blade 1 is 200 mm, the nominal saw kerf thickness is 2.5 mm, and the cutting tooth number is 20.

[0020] As Figure 2 shown, the tool head 12 is basically in the shape of a parallelogram. The tool head 12 includes a first side surface 121 provided with a cutting edge. The two side surfaces adjacent to the first side surface 121 on the tool head 12 are the second side surface 122 and the third side surface 123. Among them, the included angle between the third side surface 123 and the first side surface 121 is an obtuse angle. Both the second side surface 122 and the third side surface 123 are provided with installation grooves 125 for installation and cooperation with the circular saw disk 11, and the cross section of the installation groove 125 is configured as a V shape.

[0021] As Figure 3 and Figure 4 shown, the total length of the tool head 12 (the distance between the two farthest ends of the tool head 12 projected on the third side surface 123) is 11.98 - 12.02 mm, the thickness of the tool head 12 is 2.48 - 2.52 mm, and the cutting tip height is 2.83 - 2.86 mm. The gap d between each side tip of the tool head 12 and its side plane is 0.11 to 0.13 mm to ensure the basic accuracy of each blade.

[0022] In order to generate reasonable performance during steel cutting, the tool tip 12 is designed with a card-shaped cutting edge configuration, with a face angle α of 54°, a back angle β of 33°, and a cutting edge angle γ of 8°. The design of the card-shaped cutting edge can make the initial contact area / impact force between the cutting edge and the workpiece smaller, thereby reducing the possibility of fracture at the cutting edge.

[0023] As Figure 3 shown, the tool tip 12 is provided with a chip groove 126 along the length of the cutting edge on the first side 121, which helps prevent chips from getting stuck in the cutting edge. The cross-section of the chip groove 126 is configured as a semicircle.

[0024] As Figure 5 shown, the circular saw blade 11 includes a front side and a back side. The chip grooves 126 of two adjacent tool tips 12 are respectively close to the front side and the back side. That is, the chip grooves 126 of each tool tip 12 on the circular saw blade 1 are arranged alternately front and back to prevent hot chips from clogging the saw kerf.

[0025] A plurality of tool tip mounting grooves 111 are evenly distributed along the circumference of the circular saw blade 11, and the edges of the tool tip mounting grooves 111 are chamfered. The tool tip mounting grooves 111 are provided with mounting protrusions on both groove walls corresponding to the second side 122 and the third side 123. The mounting protrusions are in interference fit with the corresponding mounting grooves 125 to limit the relative displacement of the tool tip 12 and the circular saw blade 11 in the front and back directions. The side of the tool tip 12 opposite to the first side 121 is the fourth side 124, and the circular saw blade 11 is at least partially in contact with the fourth side 124.

[0026] The outer diameter of the circular saw blade 11 is 197.8 - 198.0 mm, and the thickness is 2.20 - 2.23 mm. The inner hole size of the circular saw blade 11 is 25.4 mm, and there is a 6 mm semi-circular keyway in the inner hole for easy installation. To ensure the rotational stability of the circular saw blade 11, the total axial runout tolerance of both end faces of the circular saw blade 11 is 0.03 mm.

[0027] As Figure 4 shown, the tool tip 12 is provided with an abutting groove 127 at the corner of the first side 121 and the second side 122, and the abutting groove 127 is configured as an arc. As Figure 5 shown, the circular saw blade 11 is provided with a jack hole 112 on one side of the tool tip mounting groove 111. The diameter of the jack hole 112 is 2.5 mm, and this jack hole 112 is used for the installation of the tool tip 12 and the circular saw blade 11.

[0028] As Figure 6As shown, specifically, a disassembly and assembly tool is used to install each cutting head 12 onto the corresponding cutting head installation slots 111 on the circular saw blade 11. The disassembly and assembly tool includes a handle 21 and a first cylindrical pin 22 and a second cylindrical pin 23 fixed to the end of the handle 21: Step C1, insert the first cylindrical pin 22 into the jack 112 on one side of the cutting head installation slot 111, and abut the second cylindrical pin 23 against the abutting groove 127 of the cutting head 12; Step C2, with the first cylindrical pin 22 as the rotation axis, rotate and press down the second cylindrical pin 23, and the installation slots 125 on the second side surface 122 and the third side surface 123 of the cutting head 12 slide along the corresponding two installation protrusions on the groove wall of the cutting head installation slot 111 respectively; Step C3, until the fourth side surface 124 of the cutting head 12 contacts the circular saw blade 11, the installation of the cutting head 12 and the circular saw blade 11 is completed.

[0029] As Figure 4 shown, the cutting head 12 is provided with a protrusion 128 near the abutting groove 127 on the second side surface 122 to increase the rigidity of the cutting head 12 at the abutting groove 127, thereby preventing the cutting head 12 from cracking due to the abutting pressure of the second cylindrical pin 23 when the cutting head 12 is installed on the circular saw blade 11.

[0030] As Figure 5 shown, the circular saw blade 11 is provided with a strip-shaped groove 113 communicating with the cutting head installation slot 111 at the bottom of the cutting head installation slot 111, and this strip-shaped groove 113 is used for the disassembly of the cutting head 12 and the circular saw blade 11.

[0031] As Figure 7 shown, specifically, a disassembly and assembly tool is used to disassemble each cutting head 12 from the corresponding cutting head installation slots 111 on the circular saw blade 11: Step D1, insert the first cylindrical pin 22 into the strip-shaped groove 113, and abut the second cylindrical pin 23 against the circumference of the circular saw blade 11; Step D2, with the second cylindrical pin 23 as the fulcrum, lift the first cylindrical pin 22, and the installation slots 125 on the second side surface 122 and the third side surface 123 of the cutting head 12 slide along the corresponding two installation protrusions on the groove wall of the cutting head installation slot 111 respectively; Step D3, until the cutting head 12 is completely separated from the cutting head installation slot 111, the disassembly of the cutting head 12 and the circular saw blade 11 is completed.

[0032] As Figure 4 shown, the cutting head 12 is provided with an inwardly concave stepped portion 129 near the third side surface 123 on the fourth side surface 124 to facilitate the first cylindrical pin 22 to be stuck at the stepped portion 129, thereby preventing the first cylindrical pin 22 from slipping when disassembling the cutting head 12.

[0033] Through the above settings, it is made that: for the circular saw blade 1 of the present application, there is no need for connecting parts such as connecting bolts to connect the cutting head 12 and the circular saw blade 11, which is convenient for the disassembly and assembly of the cutting head 12 and the circular saw blade 11, and thus convenient for the replacement of the cutting head 12.

[0034] The present application also provides a manufacturing method of the above circular saw blade 1, and the manufacturing method includes: Step A, manufacturing the cutting head 12 by the following method: Step A1, preparing tungsten carbide powder with a mass fraction of 72-78%, titanium carbide powder with a mass fraction of 5-8%, tantalum carbide powder with a mass fraction of 8-12% and cobalt powder with a mass fraction of 6-10%, mixing them, and forming a green compact by cold pressing in a mold; Step A2, further sintering the green compact through a liquid phase sintering mechanism to form a blank; Step A3, performing profile grinding on the blank using a diamond grinding wheel to generate a designed geometry and size; In Step A1, the mass parts of the powder are preferably 75.8% tungsten carbide, 6.2% titanium carbide, 10% tantalum carbide and 8% cobalt powder. Among them, 75.8% tungsten carbide, 6.2% titanium carbide and 10% tantalum carbide powders are used as hard carbides, and 8% cobalt powder is used as a binder. Compared with the traditional WC-Co (tungsten carbide-cobalt) cutting head, 16.2 wt% WC is replaced by a combination of titanium carbide and tantalum carbide to improve the resistance to crater wear in steel cutting. Through sintering, titanium carbide and tantalum carbide cubic carbides are formed, presenting the structural characteristics of an alloying grade.

[0035] Step B, manufacturing the circular saw disc 11 by the following method: Step B1, quenching the steel plate in a salt bath and then tempering it at a high temperature above 560 °C to improve its hardness and toughness simultaneously; Step B2, after heat treatment, the steel plate is surface ground to achieve the required thickness and flatness; Step B3, performing profiling by numerical control machining to generate a designed geometry and size to obtain a processed semi-finished product; Step B4, the processed semi-finished product is finally subjected to an oxidized black coating surface treatment.

[0036] It should be noted that the sequence of Step A and Step B can be adjusted.

[0037] The circular saw blade 1 manufactured by the above method presents a troostite-sorbite structure, which is composed of lamellar cementite (mixed with a small amount of spherical cementite) embedded in a ferrite matrix, and this is a typical microstructure of tool steel after quenching and tempering. Therefore, the strength and toughness of the manufactured circular saw blade 1 are improved simultaneously, thus ensuring its reliability in use.

[0038] In addition, since the stiffness of the circular saw disc 11 (made of a steel plate) is much smaller than the stiffness of the cutting head 12 (made of cemented carbide), volumetric interference will cause slight elastic deformation of the circular saw disc 11 at the cutting head mounting groove 111, and this elastic deformation forms an effective self-damping mechanism for the cutting head 12.

[0039] The present application also provides a method for disassembling and assembling a circular saw blade 1. The disassembly and assembly method includes the installation method of the cutter head 12 and the circular saw disc 11: Step C, use a disassembly and assembly tool to install each cutter head 12 onto each cutter head installation groove 111 on the circular saw disc 11. The disassembly and assembly tool includes a handle 21, a first cylindrical pin 22 and a second cylindrical pin 23 fixed to the end of the handle 21: Step C1, insert the first cylindrical pin 22 into the jack 112 on one side of the cutter head installation groove 111, and abut the second cylindrical pin 23 against the abutting groove 127 of the cutter head 12; Step C2, with the first cylindrical pin 22 as the rotation axis, rotate and press down the second cylindrical pin 23, and the installation grooves 125 on the second side 122 and the third side 123 of the cutter head 12 slide along two corresponding installation protrusions on the groove wall of the cutter head installation groove 111 respectively; Step C3, until the fourth side 124 of the cutter head 12 contacts the circular saw disc 11, and the installation of the cutter head 12 and the circular saw disc 11 is completed. The disassembly and assembly method includes the disassembly method of the cutter head 12 and the circular saw disc 11: Step D, use a disassembly and assembly tool to disassemble each cutter head 12 from each cutter head installation groove 111 on the circular saw disc 11: Step D1, insert the first cylindrical pin 22 into the strip-shaped groove 113, and abut the second cylindrical pin 23 against the circumference of the circular saw disc 11; Step D2, with the second cylindrical pin 23 as the fulcrum, lift the first cylindrical pin 22, and the installation grooves 125 on the second side 122 and the third side 123 of the cutter head 12 slide along two corresponding installation protrusions on the groove wall of the cutter head installation groove 111 respectively; Step D3, until the cutter head 12 is completely separated from the cutter head installation groove 111, and the disassembly of the cutter head 12 and the circular saw disc 11 is completed.

[0040] It should be noted that the "first", "second" and similar terms used in the specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not indicate a quantity limitation, but indicate that there is at least one. "Multiple" or "several" means at least two. Unless otherwise specified, terms such as "front", "rear", "left", "right", "lower" and / or "upper" are only for convenience of description and are not limited to a position or a spatial orientation. The terms "include" or "comprise" and similar terms mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The terms "connect" or "be connected" and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0041] As used in the specification of this application and the appended claims, the singular forms "a", "the" and "said" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term " / and" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0042] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the scope of protection of the appended claims of this application.

Claims

1. A circular saw blade, which includes a disc-shaped circular saw disc and a plurality of cutting heads installed on the circumference of the circular saw disc, and is characterized in that, the cutting head is substantially parallelogram-shaped, the cutting head includes a first side provided with a cutting edge, and the two sides adjacent to the first side on the cutting head are a second side and a third side, wherein the angle between the third side and the first side is an obtuse angle, and both the second side and the third side are provided with mounting grooves for mounting and cooperating with the circular saw disc; a plurality of cutting head mounting grooves are evenly distributed along the circumference of the circular saw disc, and mounting protrusions are provided on the two groove walls corresponding to the second side and the third side of the cutting head mounting groove, and the mounting protrusions are in interference fit with the corresponding mounting grooves, and the side of the cutting head opposite to the first side is a fourth side, and the circular saw disc is at least partially in contact with the fourth side.

2. The circular saw blade according to claim 1, wherein, The cutting head is provided with an abutting groove at the corner of the first side and the second side, and the circular saw disc is provided with a jack on one side of the cutting head mounting groove.

3. The circular saw blade according to claim 2, wherein, The cutting head is provided with a protruding portion near the abutting groove on the second side.

4. The circular saw blade according to claim 1, wherein The circular saw disc is provided with a strip-shaped groove communicating with the cutting head mounting groove at the bottom of the cutting head mounting groove.

5. The circular saw blade according to claim 4, wherein, The cutting head is provided with a concave stepped portion near the third side on the fourth side.

6. The circular saw blade according to claim 1, characterized in that, The cutting head is provided with a chip discharge groove arranged along the length direction of the cutting edge on the first side.

7. The circular saw blade according to claim 6, characterized in that, The circular saw disc includes a front side and a rear side, and the chip discharge grooves of adjacent two cutting heads are respectively close to the front side and the rear side.

8. The manufacturing method of the circular saw blade according to any one of claims 1-7, characterized in that, The manufacturing method includes: Step A, manufacturing the cutting head by the following method: Step A1, preparing tungsten carbide with a mass fraction of 72-78%, titanium carbide with a mass fraction of 5-8%, tantalum carbide with a mass fraction of 8-12% and cobalt powder with a mass fraction of 6-10% and mixing them, and cold pressing and compacting in a mold to form a green body; Step A2, further sintering the green body through a liquid phase sintering mechanism to form a blank; Step A3, using a diamond grinding wheel to perform profile grinding on the blank to generate the designed geometric shape and size; Step B, manufacturing the circular saw disc by the following method: Step B1, quenching the steel plate in a salt bath and then tempering it at a high temperature above 560°C to improve its hardness and toughness simultaneously; Step B2, after heat treatment, the steel plate is surface ground to achieve the required thickness and flatness; Step B3, performing profiling by numerical control machining to generate the designed geometric shape and size to obtain a processed semi-finished product; Step B4, the processed semi-finished product is finally subjected to an oxide black coating surface treatment.

9. The manufacturing method of the circular saw blade according to claim 8, characterized in that, In Step A1, the preferred mass parts of the powder are 75.8% tungsten carbide, 6.2% titanium carbide, 10% tantalum carbide and 8% cobalt powder.

10. A disassembly and assembly method of a circular saw blade, which is characterized in that, the disassembly and assembly method includes an installation method of the cutting head and the circular saw disc: Step C, using a disassembly and assembly tool to install each cutting head on the corresponding cutting head mounting groove of the circular saw disc, and the disassembly and assembly tool includes a handle and a first cylindrical pin and a second cylindrical pin fixed at the end of the handle: Step C1, inserting the first cylindrical pin into the jack on one side of the cutting head mounting groove, and abutting the second cylindrical pin against the abutting groove of the cutting head; Step C2: Rotate and press down the second cylindrical pin with the first cylindrical pin as the rotation axis, and the mounting grooves on the second side and the third side of the tool head slide along the corresponding two mounting protrusions on the groove wall of the tool head mounting groove respectively; Step C3: Until the fourth side of the tool head contacts the circular saw blade, the tool head and the circular saw blade are installed completely; The disassembly and assembly method includes the disassembly method of the tool head and the circular saw blade: Step D: Use the disassembly and assembly tool to disassemble each tool head from the corresponding tool head mounting groove on the circular saw blade: Step D1: Insert the first cylindrical pin into the strip-shaped groove and abut the second cylindrical pin against the circumference of the circular saw blade; Step D2: Lift the first cylindrical pin with the second cylindrical pin as the fulcrum, and the mounting grooves on the second side and the third side of the tool head slide along the corresponding two mounting protrusions on the groove wall of the tool head mounting groove respectively; Step D3: Until the tool head is completely separated from the tool head mounting groove, the disassembly of the tool head and the circular saw blade is completed.

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