Cutter welding tool
By utilizing the thermal expansion characteristics of V-grooves and expansion blocks in tool welding fixtures, the problems of difficult concentricity control and insufficient welding strength in tool welding were solved, achieving stable concentricity and high strength welding results at high temperatures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-06
AI Technical Summary
In existing technologies, concentricity is difficult to control during tool welding, resulting in insufficient welding strength. In particular, welding devices cannot effectively apply pressure in high-temperature environments, leading to low welding yield.
A tool welding fixture is adopted, including a mounting base, a positioning block, an expansion block, and a locking component. By concentrically setting the V-shaped positioning groove and the positioning hole, the difference in the thermal expansion coefficient of the expansion block provides stable pressure at high temperature, ensuring the concentricity of the tool and improving the welding strength.
It significantly improves welding yield, ensures that the tool does not deviate from concentricity at high temperatures, and produces a thin and high-strength weld layer, solving the problems of difficult concentricity control and insufficient strength in traditional welding methods.
Smart Images
Figure CN223971116U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cutting tool manufacturing technology, and in particular to a cutting tool welding fixture. Background Technology
[0002] In the field of cutting tool manufacturing, tungsten carbide tools are widely used due to their high hardness, high wear resistance, and high red hardness. Current manufacturing methods use high-performance tungsten carbide for the cutting edge and lower-cost tungsten carbide or other suitable materials for the shank. Currently, common welding methods include traditional high-frequency manual welding and vacuum welding. While manual welding offers flexibility, the upper and lower parts are prone to tilting during butt welding, making concentricity difficult to control and resulting in a low weld yield. Vacuum welding, while improving weld quality to some extent, requires pre-adjustment of the butt joint concentricity before welding. Furthermore, during welding, the molten state of the welding machine causes fluidity, leading to displacement between the upper and lower parts, making concentricity control still difficult. Additionally, vacuum welding prevents the direct application of external force, resulting in a thicker weld layer and reduced weld strength.
[0003] To address these issues, some have attempted to apply pressure using spring structures or direct screw tightening, but these methods fail at high temperatures (such as 750°C) and cannot effectively apply pressure. Therefore, providing a welding auxiliary device that can ensure weld concentricity and improve weld strength at high temperatures has become a pressing technical problem. Utility Model Content
[0004] The main purpose of this utility model is to provide a tool welding fixture, which aims to solve the problems of difficulty in controlling the concentricity of tool welding joints and insufficient welding strength in the prior art.
[0005] To achieve the above objectives, this utility model proposes a tool welding fixture, comprising:
[0006] The mounting base has a first positioning hole and a second positioning hole respectively at both ends;
[0007] A positioning block is disposed on the mounting base, and a positioning groove is provided on the positioning block. The positioning groove is concentrically arranged with the first positioning hole and the second positioning hole.
[0008] A locking component, which passes through the first positioning hole and abuts against the cutting tool, and abuts against the expansion block through the second positioning hole;
[0009] The expansion block is located in the second positioning hole, and the other end of the expansion block abuts against the cutting tool.
[0010] Optionally, the coefficient of thermal expansion of the expansion block is greater than that of the mounting base, and the coefficient of thermal expansion of the expansion block is greater than that of the cutting tool.
[0011] Optionally, the diameter of the expansion block is smaller than the diameter of the second positioning hole.
[0012] Optionally, the mounting base is further provided with a suspended groove for preventing flux overflow and limiting the lateral expansion of the expansion block.
[0013] Optionally, the length of the suspended groove is 20%-30% of the length of the tool holder.
[0014] Optionally, the positioning groove is a V-shaped positioning groove, and the angle of the V-shaped positioning groove is 60°-120°.
[0015] Optionally, both the first positioning hole and the second positioning hole include a mounting hole and a threaded hole, the mounting hole and the threaded hole are connected, and the diameter of the mounting hole is smaller than the diameter of the threaded hole.
[0016] Optionally, the locking element is a screw that passes through the threaded hole.
[0017] Optionally, the mounting base is made of high-speed steel, and the expansion block is made of copper.
[0018] The beneficial effects of this utility model are as follows: It solves the problems of difficulty in controlling the concentricity of tool welding joints and insufficient welding strength in the prior art. By setting the V-shaped positioning groove and positioning hole concentrically, it ensures that the cutting edge and the tool holder of the tool are always on the same axis during the welding process, avoiding concentricity deviations caused by tilting or displacement during manual welding or vacuum welding, thus significantly improving the welding yield. Utilizing the difference in thermal expansion coefficients between the expansion block, the mounting base, and the tool material, the expansion block expands axially after being heated during the vacuum welding heating process and squeezes the tool component to be welded, achieving continuous and stable pressure application at high temperatures, effectively reducing the thickness of the weld layer and improving the welding strength. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of a tool welding fixture according to the present invention;
[0021] Figure 2This is a cross-sectional view of a tool welding fixture according to the present invention;
[0022] Figure 3 This is a schematic diagram of a tool welding fixture according to the present invention (excluding the tool).
[0023] Figure 4 This is a cross-sectional view (excluding the cutting tool) of a cutting tool welding fixture according to the present invention.
[0024] Figure 5 This is a side view of a tool welding fixture according to the present invention;
[0025] Label Explanation:
[0026] 1. Mounting bracket;
[0027] 2. Positioning block; 21. Positioning groove;
[0028] 3. Expansion block;
[0029] 4. Suspended groove;
[0030] 5. Locking components;
[0031] 6. Knife; 61. Knife handle; 62. Blade;
[0032] 7. First positioning hole;
[0033] 8. Second positioning hole; 81. Mounting hole; 82. Threaded hole;
[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0038] One embodiment of this utility model provides a welding fixture for a cutting tool 6, as shown in the reference. Figure 1-5 ,include:
[0039] Mounting base 1, with a first positioning hole 7 and a second positioning hole 8 respectively provided at both ends;
[0040] A positioning block 2 is disposed on the mounting base 1. A positioning groove 21 is provided on the positioning block 2. The positioning groove 21 is concentrically arranged with the first positioning hole 7 and the second positioning hole 8.
[0041] Locking member 5, the locking member 5 passes through the first positioning hole 7 and abuts against the cutter 6, the locking member 5 passes through the second positioning hole 8 and abuts against the expansion block 3;
[0042] The expansion block 3 is located in the second positioning hole 8, and the other end of the expansion block 3 abuts against the cutter 6.
[0043] This invention solves the problems of difficulty in controlling the concentricity of the welding joint of the cutting tool 6 and insufficient welding strength in the prior art. By setting the V-shaped positioning groove 21 and the positioning hole concentrically, it ensures that the cutting edge 62 and the tool holder 61 of the cutting tool 6 are always on the same axis during the welding process, avoiding concentricity deviations caused by tilting or displacement during manual welding or vacuum welding, and significantly improving the welding yield. By utilizing the difference in thermal expansion coefficients between the expansion block 3, the mounting base 1, and the cutting tool 6, the expansion block 3 expands axially after being heated during the vacuum welding heating process and squeezes the cutting tool 6 component to be welded, achieving continuous and stable pressure application at high temperature, effectively reducing the thickness of the weld layer and improving the welding strength. In this embodiment, the mounting base 1 has a first positioning block 2 and a second positioning hole 8 at both ends, which are used to position the cutting tool 6 and the expansion block 3, respectively. The cutting tool 6 includes a handle 61 and a cutting edge 62. The handle 61 is placed in the positioning groove 21, and the cutting edge 62 is inserted into the first positioning hole 7. Specifically, the positioning block 2 has a positioning groove 21, the handle 61 is placed in the positioning groove 21, and the cutting edge 62 is inserted into the first positioning hole 7. The positioning groove 21 is concentric with the first positioning hole 7 and the second positioning hole 8. The penguin bag cutting tool 6 maintains concentricity on the mounting base 1. The locking member 5 passes through the first positioning hole 7 and abuts against the cutting edge 62. The locking member 5 passes through the second positioning hole 8 and abuts against the expansion block 3. By screwing the locking member 5, the handle 61 and the cutting edge 62 can still be in close contact under high temperature. The expansion block 3 is located in the second positioning hole 8. Through the thermal expansion characteristics of the expansion block 3, continuous pressure is applied to the cutting tool 6 under high temperature, ensuring the concentricity and welding strength of the cutting tool 6.
[0044] Furthermore, the coefficient of thermal expansion of the expansion block 3 is greater than that of the mounting base 1, and the coefficient of thermal expansion of the expansion block 3 is greater than that of the cutting tool 6. Specifically, by selecting an expansion block 3 with a coefficient of thermal expansion greater than that of the mounting base 1 and the cutting tool 6, in a high-temperature environment, the expansion block 3 will expand more than the mounting base 1 and the cutting tool 6, thereby providing pressure during the welding process. This causes the tool holder 61 to continuously press towards the cutting edge 62, thereby thinning the flux-formed weld layer at the joint between the tool holder 61 and the cutting edge 62, preventing the weld layer from becoming too thick and thus reducing the weld strength.
[0045] Furthermore, the diameter of the expansion block 3 is smaller than the diameter of the second positioning hole 8. In this embodiment, since the expansion block 3 expands in a high-temperature environment, it is necessary to set the diameter of the expansion block 3 to be smaller than the diameter of the second positioning hole 8. By designing the diameter of the expansion block 3 to be smaller than the diameter of the second positioning hole 8, it can be ensured that the expansion block 3 has enough space to expand during the high-temperature welding process without exerting excessive pressure on the positioning hole, thereby effectively avoiding deformation of the second positioning hole 8 and maintaining the coaxiality between the tool 6 and the mounting base 1. If the diameter of the expansion block 3 is the same as or slightly larger than the diameter of the second positioning hole 8, then at high temperatures, the expansion block 3 may exert excessive pressure on the second positioning hole 8, causing deformation of the positioning hole, thereby affecting the coaxiality between the cutting edge 62 and the tool holder 61, and reducing the strength and stability of the connection between the tool holder 61 and the cutting edge 62.
[0046] Furthermore, the mounting base 1 is also provided with a suspended groove 4 to prevent flux overflow and limit the lateral expansion of the expansion block 3. In this embodiment, there are two suspended grooves 4, located between the first positioning hole 7 and the positioning block 2 and the second positioning hole 8 and the positioning block 2, respectively. The positioning groove 21 is integrally formed with the mounting base 1. When the entire device is placed in a vacuum welding furnace for heating, the joint between the handle 61 and the blade 62 is filled with flux. The flux will become molten when heated in a high-temperature environment. The molten flux will drip downwards. Since the suspended groove 4 is provided, the flux will drip into the suspended groove 4, thereby preventing the flux from continuing to flow and thus preventing welding adhesion between the handle 61 and the mounting base 1. Furthermore, the expansion block 3 will expand along its periphery under high temperature conditions. Since the suspension groove 4 is provided, the suspension groove 4 can accommodate the expansion of the expansion block 3. Without the suspension groove 4, the expansion block 3 would be in close contact with the wall of the positioning groove 21 during the expansion process. The expansion of the expansion block 3 in all directions will cause the tool holder 61 to move upward, thereby affecting the concentricity of the tool 6.
[0047] Furthermore, the length of the suspended groove 4 is 20%-30% of the length of the handle 61. In this embodiment, the suspended grooves 4 are arranged side by side on the mounting base 1, and the length of the suspended grooves 4 is set to 20%-30% of the length of the handle 61. This avoids the problem of the positioning groove 21 being too short due to the length of the suspended groove 4 being too long, thus affecting the concentricity of the handle 61 when it is placed. Specifically, both the suspended groove 4 and the positioning groove 21 are arranged on the mounting base 1. The positioning groove 21 is used to place the handle 61. If the length of the suspended groove 4 is too long, the length of the corresponding positioning groove 21 needs to be shortened. If the length of the positioning groove 21 is too short, the handle 61 is easily placed unevenly, thus affecting the concentricity of the handle 61 and the blade 62 when they are joined. Therefore, limiting the length of the suspending groove 4 to 20%-30% of the length of the tool holder 61 can effectively control the flow range of the flux, prevent flux overflow, and avoid the problem of the positioning groove 21 being too short due to the suspending groove 4 being too long, thus affecting the concentricity of the tool holder 61 when it is placed. It should be noted that the shape of the suspending groove 4 can be rectangular or trapezoidal, etc.
[0048] Furthermore, the positioning groove 21 is a V-shaped positioning groove 21, and the angle of the V-shaped positioning groove 21 is 60°-120°. Specifically, by setting the positioning groove 21 as a V-shaped positioning groove 21, the tool handle 61 can be better positioned. If the positioning groove 21 is set as an arc-shaped groove or other shapes, since the tool handle 61 is cylindrical, during the process of the expansion block 3 expanding and compressing the tool handle 61 under high temperature, the smooth surface of the arc-shaped groove may not provide sufficient resistance to prevent the tool handle 61 from rotating, which can easily cause the tool handle 61 to rotate. Furthermore, the angle of the V-shaped positioning groove 21 is 60°-120°. This angle range can provide sufficient clamping force to prevent the tool handle 61 from moving or rotating during installation, and can also ensure that the tool handle 61 maintains stable positioning when heated and expanded. In this embodiment, the angle of the V-shaped positioning groove 21 is preferably 90°. A 90° V-shaped positioning groove 21 can better clamp the tool handle 61 and prevent the tool handle 61 from moving or rotating within the positioning groove 21.
[0049] Furthermore, both the first positioning hole 7 and the second positioning hole 8 include a mounting hole 81 and a threaded hole 82, which are connected. The diameter of the mounting hole 81 is smaller than the diameter of the threaded hole 82. In this embodiment, the diameter of the mounting hole 81 is smaller than the diameter of the threaded hole 82. The mounting hole 81 is located at the front end of the threaded hole 82. The mounting hole 81 is used to install the expansion block 3 or the blade 62. Specifically, the mounting hole 81 is a rectangular hole, which can provide a larger contact area. Compared with a circular hole, it can prevent the expansion block 3 or the blade 62 from rotating during the insertion process. Since the rectangular hole has four distinct sides, the expansion block 3 or the blade 62 will be restricted by these sides when inserted, thereby avoiding the loosening problem caused by rotation. The threaded hole 82 is provided with an internal thread for threaded connection with the locking member 5. The internal thread in the threaded hole 82 can restrict the position of the locking member 5 and prevent the locking member 5 from rotating excessively. If the diameter of the mounting hole 81 is the same as the diameter of the threaded hole 82, the locking member 5 may be pushed out of the expansion block 3 or the blade 62 due to excessive rotation, resulting in installation failure. However, the design that the diameter of the mounting hole 81 is smaller than the diameter of the threaded hole 82 ensures that when the locking member 5 is tightened to a certain extent, its front end contacts the inner wall of the mounting hole 81, thereby preventing further rotation of the locking member 5 and ensuring that the expansion block 3 or the blade 62 is firmly fixed in the positioning hole. It should be noted that the shape of the mounting hole 81 is not limited to rectangular; it can also be a polygonal hole.
[0050] Furthermore, the locking element 5 is a screw, which passes through the threaded hole 82. In this embodiment, the threaded hole 82 has an internal thread, and the locking element 5 is a screw, which can better connect with the threaded hole 82. Screws have better stability and reliability at high temperatures. By using a screw as the locking element 5, pressure can be effectively applied in a high-temperature environment, avoiding the failure of spring structures or other locking methods at high temperatures, thereby ensuring welding concentricity and improving welding strength. The screw can be made of high-temperature resistant alloy steel to ensure that it does not deform or fail at high temperatures. Compared with traditional spring structures, the screw locking method is more reliable and will not fail due to high temperatures. In this embodiment, the screw size is M5. M5 screws are widely available on the market and are easy to purchase and replace, reducing the maintenance cost and time cost of the tool 6 mounting base 1. At the same time, the standardized design of the M5 screw also facilitates the installation and disassembly operations of operators, improving work efficiency. It should be noted that in actual applications, the size and type of the locking element 5 can be selected according to the needs of the mounting base 1, and no further restrictions are imposed here.
[0051] Furthermore, the mounting base 1 is made of high-speed steel, and the expansion block 3 is made of copper. In this embodiment, the mounting base 1 is made of high-speed steel, which has high hardness and wear resistance, and can remain undeformed during high-temperature welding, maintaining a stable shape and size, thus providing a stable base. The expansion block 3 is made of copper, which has a high coefficient of thermal expansion and can expand significantly in high-temperature environments, further abutting the tool 6 and applying pressure. The tool 6 is made of tungsten steel, and the mounting base 1 is made of high-speed steel. The coefficient of thermal expansion of the copper in the expansion block 3 is greater than that of tungsten steel and high-speed steel. Through the difference in thermal expansion between high-speed steel, copper, and tungsten steel, the tool 6 can be clamped during welding in high-temperature environments, thereby improving welding strength and concentricity.
[0052] The working process of the welding fixture for the cutting tool 6 is as follows: Place the tool holder 61 in the positioning groove 21, insert the cutting edge 62 into the first positioning hole 7, lock the locking piece 5 at the first positioning hole 7, fill the joint between the tool holder 61 and the cutting edge 62 with flux, insert the expansion block 3 into the second positioning hole 8, insert the locking piece 5 into the second positioning hole 8 and tighten the locking piece 5 so that the expansion block 3 abuts against the tool holder 61, and the tool holder 61 abuts against the cutting edge 62. Then, put the completed welding fixture into a vacuum welding furnace and heat it to 750°. After the expansion block 3 is heated, it expands axially and continuously squeezes the tool holder 61. After the flux melts, a thin welding layer is formed. After the welding is completed, the welding fixture for the cutting tool 6 is taken out and cooled. The expansion block 3 shrinks, the locking piece 5 located in the second positioning hole 8 is loosened, and the welded cutting tool 6 is taken out.
[0053] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A tool welding fixture, characterized by, The utility model relates to a cutting tool locking device, including: A mounting seat is provided with a first positioning hole and a second positioning hole at both ends respectively; A positioning block is arranged on the mounting seat, and a positioning groove is formed in the positioning block, and the positioning groove is concentrically arranged with the first positioning hole and the second positioning hole; A locking piece is arranged through the first positioning hole and abuts against the cutter, and the locking piece is arranged through the second positioning hole and abuts against the expansion block; The expansion block is located in the second positioning hole, and the other end of the expansion block abuts against the cutter.
2. The knife welding fixture of claim 1, wherein, The thermal expansion coefficient of the expansion block is greater than the thermal expansion coefficient of the mounting seat, and the thermal expansion coefficient of the expansion block is greater than the thermal expansion coefficient of the cutter.
3. The knife welding fixture of claim 1, wherein, The diameter of the expansion block is smaller than the hole diameter of the second positioning hole.
4. The knife welding fixture of claim 1, wherein, The mounting seat is further provided with a suspended groove for preventing solder overflow and limiting lateral expansion of the expansion block.
5. The knife welding fixture of claim 4, wherein, The length of the suspended groove is 20%-30% of the length of the tool shank.
6. The knife welding fixture of claim 1, wherein, The positioning groove is a v-shaped positioning groove, and the angle of the v-shaped positioning groove is 60-120 degrees.
7. The knife welding fixture of claim 1, wherein, The first positioning hole and the second positioning hole each include a mounting hole and a threaded hole, the mounting hole and the threaded hole are in communication, and the hole diameter of the mounting hole is smaller than the hole diameter of the threaded hole.
8. The knife welding fixture of claim 7, wherein, The locking piece is a screw, and the screw passes through the threaded hole.
9. The knife welding fixture of claim 1, wherein, The material of the mounting seat is high-speed steel, and the material of the expansion block is red copper.