Circular saw blade, method of manufacturing a circular saw blade, and method of disassembling a circular saw blade

Abstract

The application discloses a circular saw blade, a manufacturing method of the circular saw blade and a dismounting method of the circular saw blade. The circular saw blade comprises a circular saw disc and circumferentially-distributed parallelogram-shaped cutter heads, the third side surface of the cutter head is in an obtuse angle structure with the first side surface, the second and third side surfaces of the cutter head are provided with mounting grooves in protruding interference fit with the protruding interference of the cutter head mounting grooves of the saw disc, and the fourth side surface is in contact with the saw disc to enhance stability. The cutter head is made of special hard alloy powder (WC 72-78%, TiC 5-8%, TaC 8-12%, Co 6-10%) through cold pressing, sintering and precision grinding, and the saw disc is treated through salt bath quenching, high-temperature tempering and oxidation black coating. Special dismounting tools realize quick replacement of the cutter head through the lever principle of double cylindrical pins, and the sliding positioning of installation / dismounting is completed by using the jack and the strip-shaped groove as fulcrums during operation. The application has excellent cutting performance, high structural stability and convenient maintenance, and is particularly suitable for the field of high-precision metal processing.

Description

Technical Field

[0001] This application relates to the field of sawing tool technology, and in particular to a circular saw blade, a method for manufacturing the circular saw blade, and a method for assembling and disassembling the circular saw blade. Background Technology

[0002] Circular saw blades, with their outer cutting edges (toothed edges), are fundamental cutting tools used for sawing, slicing, grooving, and related machining. Based on the material of the tool and the way the cutting edges are fixed, commercially available circular saw blades can be divided into two categories: (1) integral tools made of high-speed steel or cemented carbide; and (2) composite tools consisting of a tool steel base plate (as the main body of the tool) and welded cemented carbide tips. Both types of circular saw blades can be used for cutting wood and metal.

[0003] When the cutting edge is worn or damaged to the point that it cannot be sharpened further, the entire circular saw blade must be replaced. Therefore, Chinese Patent, Publication No. CN103465383B, Publication Date: September 30, 2015, discloses a circular saw blade with a detachable cutter head, comprising a circular saw disc, a cutter head connecting block, and cutter heads. Multiple water grooves are evenly distributed along the circumference of the circular saw disc, each with an arc-shaped bottom. The side walls of the water grooves have circular saw disc connecting half-grooves. The cutter head connecting block is placed inside the water grooves, and its side walls have block connecting half-grooves. The circular saw disc connecting half-grooves and the block connecting half-grooves combine to form a hole. A connecting bolt passes through this hole to fix the cutter head connecting block to the circular saw disc. The cutter heads are fixedly connected to the cutter head connecting block by cutter head fixing bolts. All cutter heads are located on the same side of the cutter head connecting block. The side walls of both sides of the cutter head connecting block also have square grooves for engaging with the side walls of the water grooves.

[0004] The shortcomings of the above technical solution are: it requires connecting bolts to connect the cutter head connecting block and the circular saw blade, and connecting bolts to connect the cutter head fixing bolt and the cutter head connecting block. Since a circular saw blade has many cutter heads, the above structure is troublesome to disassemble and install the cutter heads. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this application is to provide a circular saw blade, a method for manufacturing a circular saw blade, and a method for disassembling and assembling a circular saw blade, which can facilitate the disassembly and assembly of the circular saw blade, the circular saw disc, and the cutter head.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] This application provides a circular saw blade, which includes a disc-shaped circular saw disc and a plurality of cutter heads mounted on the circumference of the circular saw disc. The cutter heads are basically parallelogram-shaped and include a first side with a cutting edge. The two sides of the cutter head adjacent to the first side are a second side and a third side, wherein the 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 that mate with the circular saw disc. A plurality of cutter head mounting grooves are evenly distributed along the circumference of the circular saw disc. Each of the two groove walls corresponding to the second and third sides of the cutter head mounting grooves is provided with a mounting protrusion. The mounting protrusions are interference-fitted with the corresponding mounting grooves. The side of the cutter 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.

[0008] As a preferred technical solution, the blade head is provided with an abutment groove at the corner of the first and second sides, and the circular saw disc is provided with an insertion hole on one side of the blade head mounting groove.

[0009] As a preferred technical solution, the cutter head has a protrusion on the second side near the abutment groove.

[0010] As a preferred technical solution, the circular saw disc has a strip-shaped groove at the bottom of the cutter head mounting groove that communicates with the cutter head mounting groove.

[0011] As a preferred technical solution, the cutter head has a concave step on the fourth side near the third side.

[0012] As a preferred technical solution, the cutter head has a chip removal groove on its first side surface that is arranged along the length of the cutting edge.

[0013] As a preferred technical solution, the circular saw disc includes a front side and a rear side, and the chip removal grooves of two adjacent cutter heads are located close to the front side and the rear side, respectively.

[0014] This application also provides a method for manufacturing the above-mentioned circular saw blade, the method comprising:

[0015] Step A, the cutting head is manufactured by the following method: Step A1, prepare powders with a mass fraction of 72-78% tungsten carbide, 5-8% titanium carbide, 8-12% tantalum carbide and 6-10% cobalt and mix them, then compact them in a mold by cold pressing to form a green blank; Step A2, the green blank is further sintered by a liquid phase sintering mechanism to form a blank; Step A3, the blank is shaped and ground using a diamond grinding wheel to produce the designed geometry and size;

[0016] Step B involves manufacturing the circular saw blade using 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 simultaneously improve its hardness and toughness; Step B2, after heat treatment, the steel plate is surface-ground to achieve the required thickness and flatness; Step B3, the shape is copied using CNC machining to produce the designed geometry and dimensions, resulting in a semi-finished product; Step B4, the semi-finished product is finally surface-treated with an oxide black coating.

[0017] As a preferred technical solution, in step A1, the powder is preferably composed of 75.8% tungsten carbide, 6.2% titanium carbide, 10% tantalum carbide and 8% cobalt powder by mass.

[0018] This application also provides a method for disassembling and assembling a circular saw blade, which includes a method for installing the blade head and the circular saw disc: Step C, using a disassembly and assembly tool to install each blade head into the corresponding blade head mounting slot on the circular saw disc, the disassembly and assembly tool including a handle and a first cylindrical pin and a second cylindrical pin fixed to the end of the handle: Step C1, inserting the first cylindrical pin into the insertion hole on one side of the blade head mounting slot, and abutting the second cylindrical pin against the abutting slot of the blade head; Step C2, using the first cylindrical pin as a pivot, rotating and pressing down the second cylindrical pin, the mounting slots on the second and third sides of the blade head slide along the two corresponding mounting protrusions on the groove wall of the blade head mounting slot; Step C3, until the fourth side of the blade head contacts the circular saw disc, the blade head and the circular saw disc are installed;

[0019] The disassembly and assembly method includes the disassembly method of the cutter head and the circular saw disc: Step D, using disassembly and assembly tools, remove each cutter head from the corresponding cutter head mounting slot on the circular saw disc: Step D1, insert the first cylindrical pin into the strip groove, and place the second cylindrical pin against the circumference of the circular saw disc; Step D2, using the second cylindrical pin as a fulcrum, lift the first cylindrical pin, and the mounting slots on the second and third sides of the cutter head slide along the two corresponding mounting protrusions on the groove wall of the cutter head mounting slot; Step D3, until the cutter head is completely detached from the cutter head mounting slot, the cutter head and the circular saw disc are disassembled.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] The circular saw blade of this application does not require connecting bolts or other connecting parts to connect the cutter head and the circular saw disc, which facilitates the disassembly and assembly of the cutter head and the circular saw disc, thereby making it easier to replace the cutter head. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the circular saw blade of this application;

[0023] Figure 2 This is a schematic diagram of the cutter head of this application;

[0024] Figure 3 This is a top view of the cutting head of this application;

[0025] Figure 4 This is a front view of the cutting head of this application;

[0026] Figure 5 for Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 6 This is a schematic diagram of the installation structure of the saw head and circular saw disc in this application;

[0028] Figure 7 This is a schematic diagram of the disassembly structure of the cutter head and circular saw disc in this application;

[0029] Wherein: 1. Circular saw blade; 11. Circular saw disc; 111. Cutter head mounting groove; 112. Insertion hole; 113. Strip groove; 12. Cutter head; 121. First side; 122. Second side; 123. Third side; 124. Fourth side; 125. Mounting groove; 126. Chip removal groove; 127. Abutment groove; 128. Protrusion; 129. Stepped part; 21. Handle; 22. First cylindrical pin; 23. Second cylindrical pin. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, this application provides a circular saw blade 1, which includes a disc-shaped circular saw disk 11 and a plurality of cutting heads 12 mounted on the circumference of the circular saw disk 11. The circular saw blade 1 has a nominal diameter of 200 mm, a nominal kerf thickness of 2.5 mm, and 20 cutting teeth.

[0032] like Figure 2 As shown, the cutter head 12 is basically parallelogram-shaped. The cutter head 12 includes a first side 121 with a cutting edge, and two sides adjacent to the first side 121 are a second side 122 and a third side 123, wherein the angle between the third side 123 and the first side 121 is an obtuse angle. Both the second side 122 and the third side 123 are provided with mounting grooves 125 for mounting and mating with the circular saw disc 11, and the cross-section of the mounting grooves 125 is configured as V-shaped.

[0033] like Figure 3 and Figure 4As shown, the total length of the cutter head 12 (the distance between the two farthest ends of the cutter head 12 projected onto the third side surface 123) is 11.98~12.02 mm, the thickness of the cutter 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 cutter head 12 and its side plane is 0.11 to 0.13 mm to ensure the basic accuracy of each insert.

[0034] To achieve optimal performance in steel cutting, the cutter head 12 is designed with a retaining edge configuration, featuring a face angle α of 54°, a clearance angle β of 33°, and a cutting edge angle γ of 8°. This retaining edge design reduces the initial contact area / impact force between the cutting edge and the workpiece, thereby decreasing the likelihood of breakage at the cutting edge.

[0035] like Figure 3 As shown, the cutter head 12 has a chip removal groove 126 on the first side 121 along the length of the cutting edge, which helps to prevent chips from getting stuck in the cutting edge. The cross-section of the chip removal groove 126 is configured as a semi-circle.

[0036] like Figure 5 As shown, the circular saw disc 11 includes a front side and a rear side, and the chip removal grooves 126 of two adjacent cutter heads 12 are located close to the front side and the rear side, respectively. That is, the chip removal grooves 126 of each cutter head 12 of the circular saw blade 1 are arranged alternately to prevent hot chips from clogging the saw kerf.

[0037] The circular saw disc 11 has multiple blade mounting grooves 111 evenly distributed along its circumference, and the edges of the blade mounting grooves 111 are chamfered. Each blade mounting groove 111 has mounting protrusions on two groove walls corresponding to the second side 122 and the third side 123. These mounting protrusions are interference-fitted with the corresponding mounting grooves 125 to restrict the relative front-to-back displacement of the blade 12 and the circular saw disc 11. The side of the blade 12 opposite to the first side 121 is the fourth side 124, and the circular saw disc 11 is in at least partial contact with the fourth side 124.

[0038] The outer diameter of the circular saw disc 11 is 197.8–198.0 mm, and its thickness is 2.20–2.23 mm. The inner diameter of the circular saw disc 11 is 25.4 mm, and the inner diameter has a 6 mm semi-circular keyway for easy installation. To ensure the rotational stability of the circular saw disc 11, the total axial runout tolerance of the two end faces of the circular saw disc 11 is 0.03 mm.

[0039] like Figure 4 As shown, the cutter head 12 has an abutment groove 127 at the corner of the first side 121 and the second side 122, and the abutment groove 127 is configured in an arc shape. Figure 5 As shown, the circular saw disc 11 has an insertion hole 112 on one side of the cutter head mounting groove 111. The insertion hole 112 has a diameter of 2.5 mm and is used for mounting the cutter head 12 and the circular saw disc 11.

[0040] like Figure 6 As shown, specifically, each cutter head 12 is installed onto the corresponding cutter head mounting slot 111 on the circular saw disc 11 using a disassembly and assembly tool. 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 insertion hole 112 on one side of the cutter head mounting slot 111, and abut the second cylindrical pin 23 against the abutment groove 127 of the cutter head 12; Step C2, using the first cylindrical pin 22 as a pivot, rotate and press down the second cylindrical pin 23, and the mounting slots 125 of the second side 122 and the third side 123 of the cutter head 12 slide along the two corresponding mounting protrusions on the groove wall of the cutter head mounting slot 111; Step C3, until the fourth side 124 of the cutter head 12 contacts the circular saw disc 11, the cutter head 12 and the circular saw disc 11 are installed.

[0041] like Figure 4 As shown, the blade 12 has a protrusion 128 on the second side 122 near the abutment groove 127 to increase the rigidity of the blade 12 at the abutment groove 127, thereby preventing the blade 12 from breaking due to the pressure of the second cylindrical pin 23 when the blade 12 is installed on the circular saw disc 11.

[0042] like Figure 5 As shown, the circular saw disc 11 has a strip-shaped groove 113 at the bottom of the cutter head mounting groove 111 that communicates with the cutter head mounting groove 111. The strip-shaped groove 113 is used for disassembling the cutter head 12 and the circular saw disc 11.

[0043] like Figure 7 As shown, specifically, each cutter head 12 is removed from its corresponding cutter head mounting slot 111 on the circular saw disc 11 using disassembly tools: Step D1, insert the first cylindrical pin 22 into the strip groove 113, and place the second cylindrical pin 23 against the circumference of the circular saw disc 11; Step D2, using the second cylindrical pin 23 as a fulcrum, lift the first cylindrical pin 22, and the mounting slots 125 of the second side 122 and the third side 123 of the cutter head 12 slide along the two corresponding mounting protrusions on the groove wall of the cutter head mounting slot 111; Step D3, until the cutter head 12 is completely removed from the cutter head mounting slot 111, the cutter head 12 and the circular saw disc 11 are completely disassembled.

[0044] like Figure 4 As shown, the cutter head 12 has a recessed step portion 129 on the fourth side 124 near the third side 123, so that the first cylindrical pin 22 can be locked in the step portion 129, thereby preventing the first cylindrical pin 22 from slipping when disassembling the cutter head 12.

[0045] With the above configuration, the circular saw blade 1 of this application does not require connecting bolts or other connecting parts to connect the blade head 12 and the circular saw disc 11, so as to facilitate the disassembly and assembly of the blade head 12 and the circular saw disc 11, thereby facilitating the replacement of the blade head 12.

[0046] This application also provides a method for manufacturing the above-mentioned circular saw blade 1, the method comprising:

[0047] Step A, the cutter head 12 is manufactured by the following method: Step A1, prepare powders with a mass fraction of 72-78% tungsten carbide, 5-8% titanium carbide, 8-12% tantalum carbide and 6-10% cobalt and mix them, then compact them in a mold by cold pressing to form a green blank; Step A2, the green blank is further sintered by a liquid phase sintering mechanism to form a blank; Step A3, the blank is shaped and ground using a diamond grinding wheel to produce the designed geometry and size;

[0048] In step A1, the preferred mass fraction of the powder is 75.8% tungsten carbide, 6.2% titanium carbide, 10% tantalum carbide, and 8% cobalt powder. The 75.8% tungsten carbide, 6.2% titanium carbide, and 10% tantalum carbide powders serve as hard carbides, while the 8% cobalt powder acts as a binder. Compared to traditional WC-Co (tungsten carbide-cobalt) cutting tools, 16.2 wt% WC is replaced by a combination of titanium carbide and tantalum carbide to improve resistance to crater wear in steel cutting. Through sintering, cubic titanium carbide and tantalum carbide carbides are formed, exhibiting an alloy-grade structural characteristic.

[0049] Step B, the circular saw disc 11 is manufactured using 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 simultaneously improve its hardness and toughness; Step B2, after heat treatment, the steel plate is surface ground to achieve the required thickness and flatness; Step B3, it is shaped by CNC machining to produce the designed geometry and dimensions, resulting in a semi-finished product; Step B4, the semi-finished product is finally surface treated with an oxide black coating.

[0050] It should be noted that the order of steps A and B can be reversed.

[0051] The circular saw blade 1 manufactured using the above method exhibits a troostite-sorbite structure, consisting of lamellar cementite (mixed with a small amount of spheroidal cementite) embedded in a ferrite matrix. 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 simultaneously improved, thereby ensuring its reliability in use.

[0052] Furthermore, since the rigidity of the circular saw disc 11 (made of steel plate) is much smaller than that of the cutter head 12 (made of cemented carbide), the volume interference will cause the circular saw disc 11 to undergo slight elastic deformation at the cutter head mounting groove 111. This elastic deformation forms an effective self-damping mechanism for the cutter head 12.

[0053] This application also provides a method for disassembling and assembling a circular saw blade 1, which includes a method for installing the blade head 12 and the circular saw disc 11: Step C, using a disassembly and assembly tool to install each blade head 12 onto the corresponding blade head mounting slot 111 on the circular saw disc 11, the disassembly and assembly tool including 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, inserting the first cylindrical pin 22 into the insertion hole 112 on one side of the blade head mounting slot 111, and abutting the second cylindrical pin 23 against the abutting groove 127 of the blade head 12; Step C2, rotating and pressing down the second cylindrical pin 23 with the first cylindrical pin 22 as the pivot, the mounting slots 125 of the second side 122 and the third side 123 of the blade head 12 slide along the two corresponding mounting protrusions on the groove wall of the blade head mounting slot 111; Step C3, until the fourth side 124 of the blade head 12 contacts the circular saw disc 11, the blade head 12 and the circular saw disc 11 are installed;

[0054] The disassembly and assembly method includes the disassembly method of the cutter head 12 and the circular saw disc 11: Step D, using disassembly and assembly tools, each cutter head 12 is removed from the corresponding cutter head mounting groove 111 on the circular saw disc 11: Step D1, insert the first cylindrical pin 22 into the strip groove 113, and abut the second cylindrical pin 23 against the circumference of the circular saw disc 11; Step D2, using the second cylindrical pin 23 as a fulcrum, lift the first cylindrical pin 22, and the mounting grooves 125 of the second side 122 and the third side 123 of the cutter head 12 slide along the two corresponding mounting protrusions on the groove wall of the cutter head mounting groove 111; Step D3, until the cutter head 12 is completely removed from the cutter head mounting groove 111, the cutter head 12 and the circular saw disc 11 are completely disassembled.

[0055] It should be noted that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates at least two. Unless otherwise stated, terms such as "front," "back," "left," "right," "lower," and / or "upper" are for illustrative purposes only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0056] The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0057] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for disassembling and assembling a circular saw blade, characterized in that, The circular saw blade includes a disc-shaped circular saw disc and a plurality of cutting heads mounted on the circumference of the circular saw disc. The blade head is basically parallelogram-shaped. The blade head includes a first side with a cutting edge. The two sides of the blade head adjacent to the first side are the second side and the third side. The 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 that mate with the circular saw disc. The circular saw disc has multiple blade mounting slots evenly distributed along its circumference. Each blade mounting slot has a mounting protrusion on two slot walls corresponding to the second side and the third side. The mounting protrusion is interference-fitted with the corresponding mounting slot. The side of the blade head opposite to the first side is the fourth side. The circular saw disc is in at least partial contact with the fourth side. The blade head is provided with an abutment groove at the corner of the first and second sides, and the circular saw disc is provided with an insertion hole on one side of the blade head mounting groove. The circular saw disc has a strip-shaped groove at the bottom of the cutter head mounting groove that communicates with the cutter head mounting groove; The disassembly and assembly method includes the installation method of the cutter head and the circular saw disc: Step C: Using a disassembly and assembly tool, install each cutter head into its corresponding cutter head mounting slot on the circular saw disc. The disassembly and assembly tool includes a handle and a first cylindrical pin and a second cylindrical pin fixed to the end of the handle. Step C1: Insert the first cylindrical pin into the insertion hole on one side of the cutter head mounting groove, and abut the second cylindrical pin against the abutment groove of the cutter head. Step C2: Using the first cylindrical pin as the pivot, rotate and press down the second cylindrical pin. The mounting grooves on the second and third sides of the cutter head slide along the corresponding two mounting protrusions on the groove wall of the cutter head mounting groove. Step C3 continues until the fourth side of the cutter head contacts the circular saw disc, at which point the cutter head and circular saw disc are installed. The disassembly and assembly method includes methods for disassembling the cutter head and the circular saw disc: Step D: Use the disassembly and assembly tools to remove each cutter head from its corresponding cutter head mounting slot on the circular saw disc. Step D1: Insert the first cylindrical pin into the slot and abut the second cylindrical pin against the circumference of the circular saw disc. Step D2: Using the second cylindrical pin as a fulcrum, lift the first cylindrical pin, and the mounting grooves on the second and third sides of the cutter head slide along the corresponding two mounting protrusions on the groove wall of the cutter head mounting groove. Step D3 continues until the cutter head is completely detached from the cutter head mounting slot, at which point the cutter head and circular saw disc are disassembled.

2. The method for disassembling and assembling a circular saw blade according to claim 1, characterized in that, The cutter head has a protrusion on the second side near the abutment groove.

3. The method for disassembling and assembling a circular saw blade according to claim 1, characterized in that, The cutting head has a recessed step on the fourth side near the third side.

4. The method for disassembling and assembling a circular saw blade according to claim 1, characterized in that, The cutter head has a chip removal groove on the first side surface that is arranged along the length of the cutting edge.

5. The method for disassembling and assembling a circular saw blade according to claim 4, characterized in that, The circular saw disc includes a front side and a rear side, and the chip removal grooves of two adjacent cutter heads are respectively close to the front side and the rear side.

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