A detachable wear-resistant saw blade based on a shape memory alloy and a dismounting method thereof

Abstract

This invention discloses a wear-resistant saw blade with a detachable cutter head based on shape memory alloy. The blade includes a saw blade body and an inlay groove on the circumference of the saw blade body. A detachable cutter head is embedded in the inlay groove, and the end of the detachable cutter head is provided with a diamond. The detachable cutter head is detachably connected to the saw blade body via a U-shaped clip made of shape memory alloy. The saw blade body and the detachable cutter head are connected by the U-shaped clip made of shape memory alloy. When the saw blade wears out, the cutter head can be removed and replaced without complicated operations. Furthermore, this invention also provides a method for assembling and disassembling the wear-resistant saw blade with a detachable cutter head based on shape memory alloy. The assembly and disassembly of the detachable cutter head and the saw blade body are very simple and easy to operate.

Description

Technical Field

[0001] This invention relates to the field of saw blade technology, and more particularly to a wear-resistant saw blade with a detachable blade head based on shape memory alloy. Background Technology

[0002] In today's rapidly developing economy, high-efficiency and energy-saving cutting tools are highly favored by users. Diamond saw blades are a type of cutting tool widely used in the processing of hard and brittle materials such as concrete, refractory materials, stone, and ceramics. A diamond saw blade mainly consists of two parts: the matrix and the cutting head. The matrix is ​​the main supporting part and experiences minimal wear during use. The matrix material is required to have good elasticity, be crack-free, and have strong resistance to tempering softening. Commonly used materials include high-carbon tool steels such as 65Mn, 75Cr1, and 50Mn2V, as well as high-carbon low-alloy tool steels. However, these materials have high strength but low plasticity and toughness, making them prone to cracking during production. Furthermore, they have low hardenability and poor weldability. The cutting head of the saw blade contains very hard diamond particles, which perform the cutting action. The diamond particles are encased in metal within the cutting head. During the cutting process, impact loads can cause them to loosen and fall off, affecting the cutting effect. High-performance saw blades require strict control over factors such as the particle size and concentration of the diamond cutting head. In traditional saw blades, the cutting head and the base are joined together by welding. Therefore, once the cutting head wears out, the entire saw blade is either rendered unusable or requires significant repair effort. Furthermore, the materials for the cutting head and base are limited by the welding process, restricting the selection and preventing the achievement of an optimal material combination. Consequently, the saw blade's performance rarely reaches its theoretical best. Therefore, high-performance saw blades require breakthrough research into the connection between the cutting head and the base.

[0003] Chinese Patent Publication No. CN209775176U discloses a method for connecting the saw head and the base with bolts; Chinese Patent Publication No. CN105345936A discloses a method for connecting the saw head and the base with an elastic buckle that is limited in an inlay groove. Both of these Chinese patents disclose a method for manufacturing a saw blade with a detachable saw head. However, the saw blade manufacturing process in these two patents requires complex design of the saw head and the base, and it is difficult to ensure accurate positioning during long-term use. In addition, the process of disassembling and installing the saw head is complicated. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a wear-resistant saw blade with a detachable cutter head based on shape memory alloy, wherein the saw blade body and the detachable cutter head are connected by a U-shaped clip of shape memory alloy. This saw blade has a simple structure, reasonable design, and is easy to operate. When the saw blade is worn, the cutter head can be disassembled and replaced without complicated operations. Furthermore, this invention also provides a method for disassembling and assembling the wear-resistant saw blade with a detachable cutter head based on shape memory alloy, which is very simple and easy to operate. To achieve the above objectives, the technical solution of this invention is:

[0005] A wear-resistant saw blade with a detachable blade head based on shape memory alloy includes a saw blade body and an inlay groove provided around the periphery of the saw blade body. A detachable blade head is embedded in the inlay groove. The end of the detachable blade head is provided with a diamond. The detachable blade head is detachably connected to the saw blade body by a clip, which is a U-shaped clip made of shape memory alloy.

[0006] The inlay grooves are distributed at equal intervals around the periphery of the saw blade body, and the thickness of the inlay grooves is less than or equal to the thickness of the saw blade body.

[0007] The saw blade body and the detachable cutter head are respectively provided with a first groove and a second groove that allow the two ends of the U-shaped clip to be engaged.

[0008] The inlay groove has an oblique opening shape, and a positioning pin is fixedly provided at the bottom of the inlay groove. The lower end of the detachable cutter head is provided with a limiting groove corresponding to the positioning pin. The thickness of the positioning pin is equal to the thickness of the inlay groove, and the length of the positioning pin is equal to the depth of the inlay groove.

[0009] The detachable cutting head is divided into a connecting section and a working section connected to the connecting section. The upper end of the working section is connected to a diamond. The connecting section is provided with a limiting groove, and the working section is provided with a second groove.

[0010] The working section and diamond thickness of the detachable cutter head are equivalent to or greater than the thickness of the saw blade body; the connecting section thickness of the detachable cutter head is equivalent to the thickness of the inlay groove; and the sum of the saw blade body thickness and the U-shaped clip thickness is less than or equal to the diamond thickness.

[0011] The U-shaped clip includes a main connecting piece and side connecting pieces that are perpendicularly connected to both ends of the main connecting piece.

[0012] The shape memory alloy is any one of NiTiZr, NiTiHf, and NiPdTiHfZr.

[0013] The NiTiZr composition is 50-51 at.%Ni, 27-30 at.%Ti, and 20-22 at.%Zr; the NiTiHf composition is 50-51 at.%Ni, 27-30 at.%Ti, and 20-22 at.%Hf; the NiPdTiHfZr composition is 10-30 at.%Ni, 10-30 at.%Pd, 10-30 at.%Ti, 10-30 at.%Hf, and 10-30 at.%Zr.

[0014] A method for assembling and disassembling a wear-resistant saw blade with detachable blade heads based on shape memory alloy is disclosed. The detachable blade includes a saw blade body and an inlay groove on the periphery of the saw blade body. A detachable blade head is embedded in the inlay groove, and the end of the detachable blade head is provided with a diamond. During installation, the limiting grooves of each detachable blade head are aligned with the positioning pins in the inlay groove, so that the positioning pins are inserted into the limiting grooves. When the U-shaped clip is heated to exist in the austenitic phase, the two ends of the U-shaped clip are inserted into the first groove and the second groove of the saw blade body and the detachable blade head, respectively. When disassembly is required, the wear-resistant saw blade with detachable blade heads is heated to above the critical temperature, and the detachable blade heads automatically loosen, allowing them to be pulled out from the inlay groove.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] (1) By setting a U-shaped clip, the detachable cutter head and saw blade body can be quickly connected by the U-shaped clip made of shape memory alloy. This enables quick replacement of the detachable cutter head, reduces the cost of cutting head replacement, increases the utilization rate of the saw blade body, and greatly improves the service life of the saw blade.

[0017] (2) When the shape memory alloy of the U-shaped clip is made of NiPdTiHfZr high entropy alloy, the critical temperature of the U-shaped clip can be as high as 750°C. At this time, the saw blade can be used under ultra-high temperature conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a front view of the saw blade body in this invention.

[0020] Figure 3 This is a front view of the detachable cutter head in this invention.

[0021] Figure 4 This is a schematic diagram of the U-shaped clip in this invention.

[0022] Figure 5This is a cross-sectional schematic diagram of the connection between the detachable blade head and the saw blade body in this invention.

[0023] In the figure, 1 is the saw blade body, 1-1 is the positioning pin, 1-2 is the inlay groove, 1-3 is the first groove, 2 is the detachable cutter head, 2-1 is the diamond, 2-2 is the connecting section, 2-3 is the second groove, 2-4 is the limiting groove, 3 is the U-shaped clip, 3-1 is the main connecting piece, and 3-2 is the side connecting piece. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 and Figure 5 The diagram illustrates a wear-resistant saw blade with a detachable cutter head based on shape memory alloy. It includes a saw blade body 1 and an inlay groove 1-2 around the circumference of the saw blade body 1. A detachable cutter head 2 is embedded in the inlay groove 1-2, and a diamond 2-1 is provided at the end of the detachable cutter head 2. The detachable cutter head 2 is detachably connected to the saw blade body 1 via a U-shaped clip 3 made of shape memory alloy. The shape memory alloy is NiTiZr (nickel-titanium-zirconium), with a composition of 50-51 at.%Ni, 27-30 at.%Ti, and 20-22 at.%Zr; preferably, the NiTiZr composition is 50.3 at.%Ni, 29.7 at.%Ti, and 20 at.%Zr. The critical temperature of the U-shaped clip 3 of the shape memory alloy is approximately 120°C. The U-shaped clip 3 exists as a martensitic phase at room temperature and as an austenitic phase at high temperatures (above 300°C).

[0027] In this embodiment, the saw blade body 1 is made into a circular saw blade; in addition to a circular saw blade, the saw blade body 1 can be made into a strip saw blade or a ring saw blade as needed.

[0028] like Figure 4 As shown, the U-shaped clip 3 includes a main connecting piece 3-1 and side connecting pieces 3-2 that are perpendicularly connected to both ends of the main connecting piece 3-1. The saw blade body 1 and the detachable cutter head 2 are respectively provided with a first groove 1-3 and a second groove 2-3 that allow the side connecting pieces 3-2 at both ends of the U-shaped clip 3 to be engaged.

[0029] like Figure 2As shown, the mounting grooves 1-2 are evenly distributed around the periphery of the saw blade body 1, and the thickness of the mounting grooves 1-2 is less than or equal to the thickness of the saw blade body 1. The mounting grooves 1-2 are obliquely open, and the two included angles at the bottom of the mounting grooves 1-2 are both approximately 120 degrees. A positioning pin 1-1 is fixedly provided at the bottom of the mounting groove 1-2, and the lower end of the detachable cutter head 2 is provided with a limiting groove 2-4 corresponding to the positioning pin 1-1. The thickness of the positioning pin 1-1 is equal to the thickness of the mounting groove 1-2, and the length of the positioning pin 1-1 is equal to the depth of the mounting groove 1-2.

[0030] like Figure 3 As shown, the detachable cutter head 2 is divided into a connecting section 2-2 and a working section connected to the connecting section 2-2. The upper end of the working section is connected to a diamond 2-1. The connecting section 2-2 has a limiting groove 2-4, and the working section has a second groove 2-3. The thickness of the connecting section 2-2 of the detachable cutter head 2 is approximately equal to the thickness of the inlay groove 1-2. The sum of the thickness of the saw blade body 1 and the thickness of the U-shaped clip 3 is less than or equal to the thickness of the diamond 2-1. The thickness of the working section and the diamond 2-1 of the detachable cutter head 2 is approximately equal to the thickness of the saw blade body 1, or the thickness of the working section and the diamond 2-1 of the detachable cutter head 2 is greater than the thickness of the saw blade body 1.

[0031] By setting positioning pin 1-1 and limiting groove 2-4, the detachable cutter head 2 is pre-assembled with the saw blade body 1; then the detachable cutter head 2 is connected to the saw blade body 1 by a U-shaped clip 3 made of shape memory alloy, so that the detachable cutter head 2 can be easily installed on the saw blade body 1 and can also be easily disassembled. Thus, the saw blade can be repaired without disassembling the saw blade, which greatly saves time and improves work efficiency.

[0032] Example 2

[0033] The disassembly and assembly method of the detachable wear-resistant saw blade based on shape memory alloy is as follows: The detachable cutting saw blade includes a saw blade body 1 and an inlay groove 1-2 provided around the saw blade body 1. A detachable cutting head 2 is embedded in the inlay groove 1-2, and a diamond 2-1 is provided at the end of the detachable cutting head 2. During installation, the limiting grooves 2-4 of each detachable cutting head 2 are aligned with the positioning pins 1-1 in the inlay groove 1-2, so that the positioning pins 1-1 are inserted into the limiting grooves 2-4, thereby completing the pre-assembly of the detachable cutting head 2 and the saw blade body 1. When the U-shaped clip 3 is heated to exist in the austenitic phase, the two ends of the U-shaped clip 3 are respectively inserted into the first groove 1-3 and the second groove 2-3 of the saw blade body 1 and the detachable cutting head 2. After the temperature of the U-shaped clip 3 drops to room temperature, based on the transformation of austenite to martensite inside the shape memory alloy, the length of the U-shaped clip 3 shortens and forms a strong internal stress, which firmly locks the detachable cutting head 2 and the saw blade body 1. When the detachable blade head 2 is worn and damaged and needs to be removed, the detachable wear-resistant saw blade is heated to above the critical temperature, and the detachable blade head 2 will automatically loosen. The detachable blade head 2 can then be pulled out from the mounting slot 1-2.

[0034] Example 3

[0035] The difference between this embodiment and Embodiment 1 is that the shape memory alloy is NiTiHf (nickel-titanium hafnium), and the composition of NiTiHf is 50-51 at.% Ni, 27-30 at.% Ti, and 20-22 at.% Hf; the preferred composition of NiTiHf is 50 at.% Ni, 35 at.% Ti, and 15 at.% Hf. In this case, the critical temperature of the U-shaped clip 3 is approximately 120°C, and it exists as an austenitic phase at high temperatures (above 300°C).

[0036] Example 4

[0037] The difference between this embodiment and Embodiment 1 is that the shape memory alloy is a NiPdTiHfZr high-entropy alloy, with each element in NiPdTiHfZr having a composition of 10-30 at.%, i.e., Ni, Pd, Ti, Hf, and Zr. Preferably, the composition of NiPdTiHfZr is 25 at.% Ni, 25 at.% Pd, 16.6 at.% Ti, 16.7 at.% Hf, and 16.6 at.% Zr. In this case, the critical temperature of the U-shaped clamp 3 reaches as high as 750°C, allowing the saw blade to be used under ultra-high temperature conditions.

[0038] Example 5

[0039] The difference between this embodiment and embodiment 4 is that the preferred composition of NiPdTiHfZr is 10 at.%Ni, 10 at.%Pd, 25 at.%Ti, 25 at.%Hf, and 30 at.%Zr.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A detachable wear resistant saw blade based on shape memory alloy, characterized in that: The saw blade includes a saw blade body and an inlay groove around the periphery of the saw blade body. A detachable cutting head is embedded in the inlay groove. The end of the detachable cutting head is provided with a diamond. The detachable cutting head is detachably connected to the saw blade body by a clip. The clip is a U-shaped clip made of shape memory alloy. The inlay groove has an oblique opening shape. The two included angles at the bottom of the inlay groove are both 120 degrees. A positioning pin is fixedly provided at the bottom of the inlay groove. The lower end of the detachable cutting head is provided with a limiting groove corresponding to the positioning pin. The thickness of the positioning pin is equal to the thickness of the inlay groove, and the length of the positioning pin is equal to the depth of the inlay groove. The saw blade body and the detachable cutter head are respectively provided with a first groove and a second groove that allow the two ends of the U-shaped clip to be engaged. The U-shaped clip includes a main connecting piece and side connecting pieces that are perpendicularly connected to both ends of the main connecting piece.

2. A detachable wear-resistant saw blade based on shape memory alloy according to claim 1, characterized in that: The inlay grooves are distributed at equal intervals around the periphery of the saw blade body, and the thickness of the inlay grooves is less than or equal to the thickness of the saw blade body.

3. A detachable wear-resistant saw blade based on shape memory alloy according to claim 2, characterized in that: The detachable cutting head is divided into a connecting section and a working section connected to the connecting section. The upper end of the working section is connected to a diamond. The connecting section is provided with a limiting groove, and the working section is provided with a second groove.

4. A detachable wear-resistant saw blade based on shape memory alloy according to claim 3, characterized in that: The working section and diamond thickness of the detachable cutter head are equivalent to or greater than the thickness of the saw blade body; the connecting section thickness of the detachable cutter head is equivalent to the thickness of the inlay groove; and the sum of the saw blade body thickness and the U-shaped clip thickness is less than or equal to the diamond thickness.

5. A wear-resistant saw blade with a detachable blade head based on shape memory alloy according to claim 1, characterized in that: The shape memory alloy is any one of NiTiZr, NiTiHf, and NiPdTiHfZr.

6. A detachable wear-resistant saw blade based on shape memory alloy according to claim 5, characterized in that: The NiTiZr composition is 50-51 at.% Ni, 27-30 at.% Ti, and 20-22 at.% Zr; the NiTiHf composition is 50-51 at.% Ni, 27-30 at.% Ti, and 20-22 at.% Hf; the NiPdTiHfZr composition is 10-30 at.% Ni, 10-30 at.% Pd, 10-30 at.% Ti, 10-30 at.% Hf, and 10-30 at.% Zr.

7. A method of dismounting a detachable wear-resistant saw blade based on a shape memory alloy according to any one of claims 3-6, characterized in that: During installation, first insert the limiting grooves of each detachable cutter head into the positioning pins in the inlay groove; when the U-shaped clip is heated to the point where it exists in the austenitic phase, insert both ends of the U-shaped clip into the first and second grooves of the saw blade body and the detachable cutter head, respectively; after the temperature of the U-shaped clip drops to room temperature, based on the transformation of austenite to martensite inside the shape memory alloy, the length of the U-shaped clip shortens and forms a strong internal stress, firmly locking the detachable cutter head and the saw blade body; when disassembly is required, heat the detachable wear-resistant saw blade to above the critical temperature, and the detachable cutter head will automatically loosen, allowing you to pull it out of the inlay groove.

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