阅读说明：本技术 刀杆强化结构 (Cutter bar strengthening structure ) 是由 林国棋 于 2020-04-21 设计创作，主要内容包括：本发明提供一种刀杆强化结构,解决现有的切削刀具凭借V形构造的外部焊接手段容易锈蚀致生断裂的缺点,其采用内部熔接方式,包括：一刀杆具备一凹槽；一堵塞件结合于凹槽的开口；一刚体被堵塞件封在刀杆的凹槽；一空隙存在该刚体、刀杆与堵塞件之间；一通孔连接空隙至刀杆的外表；以及,一金属熔接部填补通孔和空隙而使刚体结合刀杆成为一体。如此,该金属熔接部属于内部的熔接构造,不仅提升刀杆的强度,同时解决外露焊接式切削刀具容易断裂的弊端。(The invention provides a cutter bar strengthening structure, which solves the defect that the existing cutting tool is easy to rust and cause fracture by an external welding means with a V-shaped structure, adopts an internal welding mode and comprises the following steps: a cutter bar is provided with a groove; a blocking piece is combined with the opening of the groove; a rigid body is sealed in the groove of the cutter bar by a plug; a gap is arranged among the rigid body, the cutter bar and the blocking piece; a through hole connects the gap to the outer surface of the cutter bar; and a metal welding part fills the through hole and the gap to integrate the rigid body with the cutter bar. Therefore, the metal welding part belongs to an internal welding structure, the strength of the cutter bar is improved, and the defect that an exposed welding type cutting tool is easy to break is overcome.)

1. A cutter bar reinforcing structure, comprising:

a cutter bar is provided with a groove;

a blocking piece is combined with the opening of the groove;

a rigid body is sealed in the groove of the cutter bar by a plug;

a gap is arranged among the rigid body, the cutter bar and the blocking piece;

a through hole connects the gap to the outer surface of the cutter bar; and

a metal weld fills the through hole and the gap to integrate the rigid body with the tool holder.

2. The shank reinforcing structure of claim 1, wherein the metal weld is a welding material having a melting point lower than that of the shank, the plug, and the rigid body.

3. The shank reinforcing structure of claim 1, wherein the shank and the plug are alloy steels having the same melting point, and the rigid body is tungsten steel having a higher melting point than the shank.

4. The tool holder reinforcing structure as claimed in claim 1, wherein the recess of the tool holder is formed as a concave conical surface, and the rigid body has a convex conical surface with a tip directed toward a converging end of the concave conical surface.

5. The toolholder reinforcing structure as set forth in claim 1, wherein the blocking member has a concave conical surface and the rigid body has a convex conical surface with a tip directed toward a converging end of the concave conical surface.

6. The shank-reinforcing structure as claimed in claim 1, wherein the recess of the shank has a flat surface, and the rigid body forms a flat end surface facing the flat surface.

7. The shank-reinforcing structure as claimed in claim 1, wherein the blocking member has a flat surface, and the rigid body forms a flat end surface facing the flat surface.

8. The toolholder reinforcing structure as set forth in claim 7, wherein the blocking member is a stud.

9. The tool bar reinforcement structure as claimed in claim 1, wherein at least one layer of protection is attached to the exterior of the tool bar, and the protection shields the metal weld from the external atmosphere.

Technical Field

The invention relates to the field of hardness of cutting tools, in particular to a cutter bar reinforcing structure.

Background

Such as turning tools, boring tools, milling tools, drill bits, reamers, sintered cutters, etc., perform cutting operations on metal materials.

A boring cutter is disclosed in chinese patent No. 206839200, and is formed by combining a cutter head with a cutter bar by welding. Wherein, the cutter arbor adopts the alloy material of high proportion, and the tool bit selects alloy steel, and the boring cutter of high proportion alloy is constituteed jointly to the two. The welding mode is a V-shaped butt joint structure, and the combination area of the cutter head and the cutter bar is increased.

However, since the butt structure is exposed to the outside of the boring cutter, the welded portion is easily corroded, which causes a drawback that the boring cutter is broken.

The same disadvantages occur with other cutting tools using exposed welding, such as the reamer of chinese patent 102672277, the slot milling tool of chinese patent 207942035, and the micro-tool (such as micro-drill or micro-milling cutter) of taiwan patent I296949.

Therefore, how to improve the structure of the cutting tool becomes an urgent issue to be solved by the present invention.

Disclosure of Invention

In view of this, the present invention provides a new cutting tool, the main objects of which are: by adopting an internal welding mode, the strength of the cutter bar is improved, and the defect that an exposed welding type cutting tool is easy to break is overcome.

In view of the above, the present invention provides a cutter bar reinforcing structure, comprising:

a cutter bar is provided with a groove;

a blocking piece is combined with the opening of the groove;

a rigid body is sealed in the groove of the cutter bar by a plug;

a gap is arranged among the rigid body, the cutter bar and the blocking piece;

a through hole connects the gap to the outer surface of the cutter bar; and

a metal weld fills the through hole and the gap to integrate the rigid body with the tool holder.

The cutter bar strengthening structure is characterized in that the metal welding part is a welding material with a melting point lower than that of the cutter bar, the blocking piece and the rigid body.

The cutter bar is reinforced, wherein the cutter bar and the blocking piece are alloy steel with the same melting point, and the rigid body is tungsten steel with the melting point higher than that of the cutter bar.

The cutter bar strengthening structure is characterized in that the groove of the cutter bar forms a concave conical surface, the rigid body is provided with a convex conical surface, and the tip of the convex conical surface faces the gathering end of the concave conical surface.

The cutter bar strengthening structure is characterized in that the blocking piece is provided with a concave conical surface, the rigid body is provided with a convex conical surface, and the tip end of the convex conical surface faces the gathering end of the concave conical surface.

The cutter bar strengthening structure is characterized in that the groove of the cutter bar is provided with a plane, and a flat end face is formed at the position of the rigid body facing to the plane.

The cutter bar strengthening structure is characterized in that the blocking piece is provided with a plane, and a flat end face is formed at the position, facing the plane, of the rigid body.

The cutter bar strengthening structure is characterized in that the plugging piece is a stud.

The cutter bar strengthening structure is characterized in that at least one layer of protection part is attached to the outside of the cutter bar, and the protection part isolates the metal welding part from contacting with the outside air.

Thus, in the cutting tool, the metal welding part belongs to the welding structure in the cutter bar, so that the tungsten steel and the alloy steel are combined together, the strength of the cutter bar is improved, and the defect that the exposed welding type cutting tool is easy to break is overcome.

To further clarify the objects, structures, features and advantages of the present invention, one or more preferred embodiments will be described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a flow chart of the manufacturing process of the strengthened tool bar of the present invention.

Fig. 2-5 are schematic views of a first embodiment of a cutting tool for understanding the process.

Fig. 6 is a schematic view of a second embodiment of a cutting tool.

Description of reference numerals: a combination 10; fusion welding 12; surface treatment 14; a cutting tool 20; a first end 21; a second end 22; a head portion 23; a tool bar 24; a blade 25; a cutting portion 251; a recess 26; concave conical surfaces 27, 32; the gathering terminals 271, 321; the flat surfaces 272, 322; through holes 28, 281, 34; a blocking member 30; a stud 301; a rigid body 40; the convex conical surface 42; a flat end surface 421; a tip 44; a void 46; a surface 48; a metal welding liquid 50; a remainder 52; a metal weld 54; and a protection portion 56.

Detailed Description

Fig. 1 is a manufacturing flow chart illustrating a process of improving the strength of a shank of a cutting tool according to the present invention, including: three steps of assembly 10, fusion welding 12 and surface treatment 14.

It is advantageous to interpret the request to select a cutting tool 20 as shown in fig. 2-5 to describe the manufacturing process of the present invention.

Specifically, the cutting tool 20 is a first embodiment, depicting a head 23 adjacent a first end 21 of the cutting tool 20, and a shank 24 extending from a second end 22 of the cutting tool 20 to the head 23, the shank 24 being integrally formed with the head 23.

In the present embodiment, the head 23 incorporates a blade 25, and a cutting portion 251 of the blade 25 extends from the first end 21 of the cutting tool 20 for cutting the exterior of a metal workpiece (not shown). Thus, the cutting tool 20 is a turning tool.

In some embodiments, the head 23 incorporates a plurality of inserts, allowing the cutting tool 20 to be used as a milling cutter or a slot milling cutter. Alternatively, the head 23 may be provided with one or more helical blades so that the cutting tool 20 cuts a metal workpiece like a reamer or a drill.

Next, with reference to fig. 1-5, the strengthening process of the tool bar 24 is described in detail.

In the step of assembling 10, the tool holder 24 is provided with a recess 26, the recess 26 opening into the second end 22 of the cutting tool 20 for receiving a rigid body 40. A plug 30 is engaged with the opening of the recess 26, the plug 30 sealing the rigid body 40 in the recess 26 of the shank 24 to complete the assembly 10.

In this embodiment, the depth (or bottom) of the recess 26 of the tool holder 24 forms a concave conical surface 27. The end of the rigid body 40 facing the bottom of the recess 26 forms a convex conical surface 42, the tip 44 of the convex conical surface 42 facing a converging end 271 of the concave conical surface 27. In addition, the end of the plug 30 that extends into the recess 26 also has a concave conical surface 32, and the converging end 321 of the concave conical surface 32 faces the tip 44 of the other convex conical surface 42 of the rigid body 40.

Wherein a gap 46 exists between the rigid body 40, the shank 24 and the obturating member 30. The gap 46 is generally defined as a wall of the recess 26 surrounded by two concave conical surfaces 27, 32 engaging the tool holder 24, and a surface 48 extending along the circumferential direction of the rigid body 40 connected by two convex conical surfaces 42, which together form a closed space with a distance of about 0.03mm to 0.6 mm.

In addition, two through holes 28, 34 in opposite directions connect the recess 46 to the outer surface of the tool shank 24. Along the thickness direction of the cutter bar 24, the through hole 28 passes through the cutter bar 24 and penetrates into the gathering end 271 of the concave conical surface 27, and the through hole 34 passes through the cutter bar 24 and the blocking piece 30 and penetrates into the gathering end 321 of the concave conical surface 32.

During the fusion welding 12 step, a welding material contacts any of the through holes 28, 34 of the heated tool shank 24. The tool bar 24 and the plug 30 are made of the same material, such as alloy steel with the same melting point. As for the metal material of the rigid body 40, tungsten steel having a melting point higher than that of the tool bar 24 is used. Because the alloy and tungsten steels have a melting point higher than the melting point of the welding material, the tool holder 24 is heated to a temperature higher than the melting point of the welding material, which melts into the molten metal 50 before the tool holder 24, the plug 30, or the rigid body 40. Under capillary action, the molten metal 50 infiltrates between the tool bar 24, the plug 30 and the rigid body 40 to complete the fusion welding 12.

The term "wetting" as used herein means that the flowing molten metal 50 fills the gap 46 and the through holes 28 and 34. In other words, the metal welding liquid 50 is filled between the tool bar 24, the closing member 30 and the rigid body 40.

After cooling, the molten metal 50 transforms from a liquid state to a solid state, defining a metal weld 54. The metal weld 54 fills the through hole 28 and the gap 46, thereby integrating the rigid body 40 with the tool holder 24. Of course, the molten metal 50 overflows the remainder 52 of the through-holes 28, 34 and is cooled from a liquid state to a solid state.

In the surface treatment 14 step, the solid residue 52 is removed. Optionally, at least one layer of protection 56 is attached to the exterior of the tool bar 24 to isolate the tool bar 24 and the metal weld 54 from the outside atmosphere, thereby reducing the possibility of corrosion.

Removal, as referred to herein, broadly refers to an elimination surplus 52 of a means or device for grinding, cutting or ripping.

Fig. 6 shows a second embodiment of the cutting tool 20, in which the strength of the tool bar 24 is increased by the same process as the first embodiment, with the difference in the slight change of the structure:

first, two through holes 28, 281, which are opposite in direction, are connected to the gap 46 through the tool bar 24, respectively. In particular, the through hole 281 does not have to pass the obstruction 30.

Secondly, the plug is a stud 301, and the stud 301 is locked in the opening of the groove 26, unlike the first embodiment which adopts a tightening means to plug the plug in the groove.

Furthermore, the recess 26 of the tool holder 24 has a plane 272, and the end of the rigid body 40 facing the plane 272 has a flat end surface 421. The plug 30 also has a flat surface 322, the flat surface 322 facing the other flat end surface 421 of the rigid body 40.