Welded complex large rake angle finishing tool

Abstract

The utility model discloses a kind of welding composite large front angle finishing tool, including tool bar and blade, tool bar front side is equipped with tool groove, blade tail part is embedded and welded in tool groove, tool groove includes bottom support surface and inner end surface, bottom support surface lower end connects tool bar front end surface, bottom support surface upper end connects inner end surface, the included angle between inner end surface and bottom support surface is 90 degrees, inner end surface top and tool bar side surface between being equipped with one concave transition curved surface;Tool bar front end surface is inclined plane, the included angle between tool bar front end surface and tool bar radial direction is 30 degrees, the included angle between tool bar front end surface and bottom support surface is 20 degrees, it is 90 degrees between the blade back and top surface, blade back and tool groove bottom support surface corresponding welding, blade top surface and tool groove inner section surface corresponding welding, the rake face of blade is parallel with blade back, the back of blade and blade edge are connected by multiple continuous transition plane;The large front angle of the present tool is more suitable for the processing of thin-walled parts or soft materials, and the machining precision is high.

Description

Technical Field

[0001] This utility model belongs to the field of machining tool technology, specifically relating to a welded composite large rake angle finishing tool. Background Technology

[0002] Lathe tools are generally made of high-speed steel or cemented carbide. Standard lathe tools have a relatively small rake angle (typically 5°-15°) and a blunter cutting edge, leading to increased main cutting forces, higher machine tool power consumption, and increased friction causing higher temperatures in the cutting zone, thus accelerating tool wear. When machining thin-walled or low-rigidity workpieces, ordinary lathe tools are prone to chatter, resulting in chatter marks or dimensional deviations. When machining soft or highly ductile materials, such as aluminum, copper, magnesium alloys, or low-carbon steel, tool sticking is likely to occur, affecting surface finish and limiting workpiece surface roughness. Furthermore, cemented carbide lathe tools have low toughness and are prone to chipping or breakage during interrupted cutting, while high-speed steel lathe tools are prone to softening due to high temperatures during high-speed machining, requiring frequent cooling or speed reduction, thus limiting tool life and reliability. Utility Model Content

[0003] To address the aforementioned problems and technical needs, this utility model provides a welded composite large rake angle finishing tool. This tool welds a tungsten carbide insert to the front end of a high-speed steel tool holder, combining the advantages of both. The tool has a large rake angle, making it more suitable for machining thin-walled parts or soft materials.

[0004] The technical solution of this utility model is as follows: A welded composite large rake angle finishing tool includes a tool shank and a cutting insert. A groove is provided on the front side of the tool shank, and the tail of the cutting insert is embedded and welded in the groove. The groove is located on the side of the front end of the tool shank and includes a bottom support surface and an inner end surface. The lower end of the bottom support surface is connected to the front end surface of the tool shank, and the upper end of the bottom support surface is connected to the inner end surface. The included angle between the inner end surface and the bottom support surface is 90 degrees. Both the inner end surface and the bottom support surface are flat. A concave transition surface is provided between the top of the inner end surface and the side of the tool shank. The front end surface of the tool shank is an inclined surface. The included angle between the front end surface of the tool shank and the radial direction of the tool shank is 30 degrees. The included angle between the front end surface of the tool shank and the bottom support surface is 20 degrees. The included angle between the back surface and the top surface of the cutting insert is 90 degrees. The back surface of the cutting insert is welded to the bottom support surface of the groove, and the top surface of the cutting insert is welded to the inner section of the groove. The rake face of the cutting insert is parallel to the back surface of the cutting insert. The included angle between the rake face of the cutting insert and the axial direction of the tool shank is 40 degrees. The back surface and the cutting edge of the cutting insert are connected by multiple continuous transition planes.

[0005] Furthermore, the transition plane includes a front section plane, a middle section plane, and a rear section plane connected sequentially from the cutting edge. The front section plane is parallel to the radial direction of the tool holder, the middle section plane has an angle of 8 degrees with the radial direction of the tool holder, the rear section plane has an angle of 30 degrees with the radial direction of the tool holder, and the rear section plane is on the same plane as the front end face of the tool holder.

[0006] Furthermore, the width of the rear section of the blade is the same as that of the blade shank, and one side of the blade is provided with a narrowing bevel, the front end of which extends to the cutting edge, and the width of the cutting edge is 2.0mm.

[0007] Furthermore, the included angle between the narrowing bevel and the axial direction of the tool holder does not exceed 50 degrees.

[0008] Furthermore, a chamfer is provided between the back and top surfaces of the blade. This chamfer reduces the impact of the tip on the two vertical planes, prevents the back and top surfaces of the blade from not fitting tightly against the groove, and improves the subsequent welding strength.

[0009] Furthermore, the cross-section of the tool holder is square, and chamfers are provided between the tail end face and the four sides of the tool holder.

[0010] Furthermore, the tool holder is made of high-speed steel, and the blade is made of tungsten carbide alloy.

[0011] The beneficial effects of this utility model are as follows: 1) By welding, the tungsten carbide alloy blade is welded to the front end of the high-speed steel tool holder. Tungsten carbide alloy has high hardness and heat resistance, while high-speed steel is more economical. The composite welding structure combines the advantages of both materials, reducing production costs while maintaining better cutting performance; 2) A continuous transition plane is provided from the back of the blade to the cutting edge, making the blade thickness gradually decrease from back to front. The narrowing bevel on the side of the blade makes the blade width gradually narrow from back to front. This makes the cutting edge of the blade more... The sharper the blade, the lower the resistance to cutting into the material, and the better the support for the cutting edge, preventing the cutting edge from chipping, improving cutting stability, and extending the tool life; 3) The angle between the rake face of the insert and the axis of the tool holder is 40 degrees. The large rake angle is more suitable for cutting high-plasticity materials such as aluminum and copper. The large rake angle can prevent the material from sticking to the tool. At the same time, the sharp cutting edge can significantly reduce the main cutting force and radial force, reduce the machine tool load and energy consumption, and produce high surface quality. It can reduce the generation of built-up edge and is suitable for machining thin-walled parts with high surface finish requirements and high machining accuracy. Attached Figure Description

[0012] Figure 1 This is a front structural view of the cutting tool of this utility model; Figure 2 for Figure 1 Enlarged structural diagram of the blade section; Figure 3 This is a side view of the cutting tool of this utility model; Figure 4 This is a structural diagram of the tool holder in this utility model; Figure 5 This is a schematic diagram of the blade structure in this utility model; The markings in the figure are as follows: tool holder 1, tool holder front face 11, chamfer 12, blade 2, blade top face 21, blade front face 22, blade back face 23, transition plane 24, front section plane 241, middle section plane 242, rear section plane 243, narrowing bevel 25, mounting chamfer 26, cutting edge 27, tool groove 3, bottom support surface 31, inner end face 32, transition curved surface 4. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1-5 The diagram shows a welded composite high rake angle finishing tool of this utility model, comprising a tool holder 1 and an insert 2. A groove 3 is provided on the front side of the tool holder 1, and the tail of the insert 2 is embedded and welded into the groove 3. The groove 3 is located on the side of the front end of the tool holder 1 and includes a bottom support surface 31 and an inner end surface 32. The lower end of the bottom support surface 31 is connected to the front end face of the tool holder 1, and the upper end of the bottom support surface 31 is connected to the inner end surface 32. The included angle between the inner end surface 32 and the bottom support surface 31 is 90 degrees. Both the inner end surface 32 and the bottom support surface 31 are flat. A concave transition surface 4 is provided between the top of the inner end surface 32 and the side of the tool holder. The tool holder 1 is made of high-speed steel, and the insert 2 is made of tungsten carbide alloy. The transition surface 4 provides a clearance area for the installation of the insert 2. The tungsten carbide insert is welded to the front end of the high-speed steel tool holder by welding. Tungsten carbide has high hardness and heat resistance, while high-speed steel is more economical. The composite welding structure can combine the advantages of the two materials, reducing production costs while maintaining better cutting performance.

[0015] The front end face of the tool holder is beveled, the angle between the front end face 11 and the radial direction of the tool holder is 30 degrees, the angle between the front end face 11 and the bottom support surface 31 is 20 degrees, the angle between the back surface 23 and the top surface 21 of the blade is 90 degrees, the back surface 23 of the blade is welded to the bottom support surface 31 of the groove 3, and the top surface of the blade is welded to the inner section of the groove 3. The cross-section of the tool holder 1 is square, and chamfers 12 are provided between the tail end face and the four sides of the tool holder 1.

[0016] The rake face of the blade 2 is parallel to the back face 23 of the blade. The angle between the rake face 22 of the blade and the axial direction of the tool shank is 40 degrees. The back face 23 of the blade and the cutting edge 27 are connected by multiple continuous transition planes 24. The transition planes 24 include a front plane 241, a middle plane 242 and a rear plane 243 connected sequentially from the cutting edge 27. The front plane 241 is parallel to the radial direction of the tool shank. The angle between the middle plane 242 and the radial direction of the tool shank is 8 degrees. The angle between the rear plane 243 and the radial direction of the tool shank is 30 degrees. The rear plane 243 is on the same plane as the front end face 11 of the tool shank.

[0017] The width of the rear section of the blade is the same as that of the tool holder 1. One side of the blade 2 has a narrowing bevel 25, the front end of which extends to the cutting edge 27, which has a width of 2.0 mm. The angle between the narrowing bevel 25 and the axial direction of the tool holder does not exceed 50 degrees. A continuous transition plane 24 is provided from the back of the blade 2 to the cutting edge, so that the thickness of the blade 2 gradually decreases from back to front. The narrowing bevel 25 on the side of the blade makes the width of the blade gradually narrow from back to front. This makes the cutting edge of the blade sharper, reduces the resistance to cutting into the material, provides good support for the cutting edge, prevents the cutting edge from chipping, improves cutting stability, and extends the service life of the tool.

[0018] A chamfer 26 is provided between the back surface 23 and the top surface 21 of the blade. The chamfer 26 reduces the influence of the tip on the two vertical planes, prevents the back surface 23 and the top surface 21 of the blade from not fitting tightly with the groove 3, and improves the subsequent welding strength.

[0019] The above descriptions are merely several preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations and substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A welding composite large rake angle finishing tool, characterized in that: The tool includes a tool holder and a blade. A groove is provided on the front side of the tool holder, and the tail of the blade is embedded and welded into the groove. The groove is located on the side of the front end of the tool holder and includes a bottom support surface and an inner end surface. The lower end of the bottom support surface is connected to the front end face of the tool holder, and the upper end of the bottom support surface is connected to the inner end face. The included angle between the inner end face and the bottom support surface is 90 degrees. Both the inner end face and the bottom support surface are flat. A concave transition surface is provided between the top of the inner end face and the side of the tool holder. The front end face of the tool holder is inclined, and the included angle between the front end face and the radial direction of the tool holder is 30 degrees. The included angle between the front end face and the bottom support surface is 20 degrees. The included angle between the back and top surfaces of the blade is 90 degrees. The back surface of the blade is welded to the bottom support surface of the groove, and the top surface of the blade is welded to the inner section of the groove. The rake face of the blade is parallel to the back surface of the blade, and the included angle between the rake face and the axial direction of the tool holder is 40 degrees. The back surface and the cutting edge of the blade are connected by multiple continuous transition planes.

2. The welding composite large rake angle finishing tool according to claim 1, characterized in that: The transition plane includes a front section plane, a middle section plane, and a rear section plane connected sequentially from the cutting edge. The front section plane is parallel to the radial direction of the tool holder, the middle section plane has an angle of 8 degrees with the radial direction of the tool holder, the rear section plane has an angle of 30 degrees with the radial direction of the tool holder, and the rear section plane is on the same plane as the front end face of the tool holder.

3. The welding composite large rake angle finishing tool according to claim 2, characterized in that: The width of the rear section of the blade is the same as that of the blade holder. One side of the blade has a narrowing bevel, the front end of which extends to the cutting edge, and the width of the cutting edge is 2.0mm.

4. The welding composite large rake angle finishing tool according to claim 3, characterized in that: The included angle between the narrowing bevel and the axial direction of the tool holder shall not exceed 50 degrees.

5. The welding composite large rake angle finishing tool according to claim 1, characterized in that: A chamfer is provided between the back and top surfaces of the blade.

6. The welding composite large rake angle finishing tool according to claim 1, characterized in that: The cross-section of the tool holder is square, and chamfers are provided between the tail end face and the four sides of the tool holder.

7. The welding composite large rake angle finishing tool according to claim 1, characterized in that: The tool holder is made of high-speed steel, and the blade is made of tungsten carbide alloy.

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