Finish turning and tapping cutter

Abstract

According to the finish turning and tapping tool, the two tool noses used in the two adjacent working procedures are arranged on the same blade side by side, the finish turning tool nose is located in front of the tapping tool nose during machining, and the finish turning working procedure and the tapping working procedure are executed together. A height difference exists between the finish turning tool nose and the tapping tool nose, and the height difference between the finish turning tool nose and the tapping tool nose is equal to the depth of a thread. In the prior art, two working procedures need to be completed by two kinds of blades for clamping twice, tool setting twice and machining twice respectively, after the two tool noses are combined together, only one kind of blade needs to be used for clamping once, tool setting once and machining once, that is, the finish turning working procedure and the tapping working procedure are conducted at the same time, and compared with step-by-step completion in the prior art, the machining efficiency is greatly improved. And the production efficiency is greatly improved. And the re-clamping error and the re-tool-setting error are avoided, the error caused by the shape change of the re-selected tool does not exist, and the machining precision is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of machining tool technology, and more specifically, to a tool that integrates precision turning and tapping. Background Technology

[0002] In the machining industry, thread tapping typically involves finishing followed by thread turning. These two processes require two different types of cutting tools to be clamped twice, with two tool settings and two machining operations. After finishing, re-installing the tapping tool introduces errors during clamping. The two clamping operations also require controlling the height difference between the two tools to ensure the thread depth, further compounding the errors. Re-setting the tool, along with changes in tool shape, and the accumulation of various errors, all negatively impact machining accuracy. The need to stop the machine for clamping and tool setting also leads to low machining efficiency.

[0003] 1. Patent application number 201620168704.4, entitled "Invention Patent for a Multifunctional Lathe Tool," involves welding the head of another ordinary machining tool to the back of a standard sealing surface machining tool. This creates a single tool that retains the original sealing surface machining head for machining the sealing surface and end face of the product, while the other head, similar to an external turning tool, machines the outer diameter of the product. By combining the external turning and sealing surface machining tools into one, a single tool can machine both the outer diameter and the end face and sealing surface of the product. This reduces the number of tool positions occupied on the tool holder, prevents interference when adding tools, reduces the frequency of tool changes during machining, and improves production efficiency. While this solution reduces the number of tool positions occupied on the tool holder, decreases the number of clamping operations, and reduces clamping errors, it still requires stopping the machine and tool setting during use, thus offering limited improvement in production efficiency.

[0004] 2. Application number 202120435401.5, patent title: A Low-Cost, Highly Versatile Turning Combination Tool. This tool employs a single, multi-head, detachable integrated design, offering significant advantages in efficiency and quality compared to multi-tool changing machining. It can simultaneously machine end faces, rear end faces, and inner holes at both ends. Both the first and second tool bodies are replaceable, allowing for machining multiple parts with a single tool. This avoids tool-changing errors, and the limiting effect between the first and second positioning holes and the positioning pin during tool replacement prevents misalignment from affecting subsequent machining dimensions. This solves the tool-changing deviation problem in conventional turning processes, improving product efficiency. Those skilled in the art will recognize the appendix to this patent. Figure 1 It can be seen that this type of knife is generally a chamfering knife, with two blades mounted on one handle, one for chamfering to the left and one for chamfering to the right. They are used separately during processing. Although several blades are mounted on one knife, all processes are completed step by step during processing, and the blades need to be recalibrated for each process.

[0005] The paper, numbered 1002-2333(2004)04-0044-02 and titled "Analysis of Tool Changing Error in CNC Lathes," analyzes the composition of tool changing errors in CNC lathes and proposes methods to reduce these errors. Tool changing errors in CNC lathes include tool setting error, tool turning error, and indexing error. To reduce tool setting error, a constant step feed method is used during tool setting, and a minimum single-step value (e.g., 0.001) is used for trial cutting. Furthermore, a dedicated fixture should be used to improve the accuracy of tool setting in the Z-direction. Since Z-direction tool setting generally requires setting a fixed point in the Z-direction, measuring the distance between different tool tips at the same position, and inputting the result, a dedicated fixture can effectively improve the accuracy of the input value. Alternatively, a face can be machined first, then a step can be machined, and the step width measured for Z-direction tool setting. To reduce tool turning error, one method is to use a high-precision tool post, and the other is to reduce the types of tools to reduce the number of tool changes. For example, using a double-pointed tool (… Figure 2 It replaces the left and right offset cutters, allowing the machining of the forming surface that originally required two cutters to be completed with one cutter, thereby reducing the error of tool turning.

[0006] Both of the above patents involve adding cutting blades to the tool holder to reduce the number of clamping operations, decrease errors caused by tool changes, and improve production efficiency. However, in actual use, the machine still needs to stop and change tools and set them after each machining operation, meaning errors from tool changes and setting still exist. Although the tool change and clamping time is reduced, the improvement in production efficiency is limited. Similarly, in the aforementioned papers, to reduce tool turning errors, the paper uses... Figure 2 The double-pointed knife in the invention allows the forming surface processing that originally required two knives to be completed with one knife. The principle of the double-pointed knife is the same as that of the two patents mentioned above. Both add a blade to the original knife handle. Although one knife has the function of two knives, the two processes are still completed in separate steps.

[0007] Existing technologies contain many multi-functional cutting tools proposed in the two patents and papers mentioned above, and even tools with 8 or 16 cutting tips, such as... Figure 1 and Figure 2 As shown, these tools can reduce the number of setups, improve the cost-effectiveness of the tools, and increase production efficiency, but they still require stopping the machine for tool setting, resulting in tool setting errors and limited improvement in production efficiency.

[0008] 3. The application number is 201920475713.1, and the patent name is an invention patent for a multi-functional cutting tool. It integrates a drilling tool, a chamfering tool, and a milling tool into one unit. When in use, the drill bit first drills a hole, then the chamfering tool chamfers the hole, and finally the milling tool mills the surface. There is no need to change tools during use. Multiple processes are completed in one positioning, which improves the processing efficiency of the workpiece.

[0009] The third patent is an improvement over the first and second patents, reducing the number of clamping operations and eliminating the need for tool setting, allowing multiple processes to be completed in one go. However, each process is still performed step-by-step. For example, in the third patent, drilling is performed first, followed by chamfering, and finally milling. Chamfering can only be performed after drilling is complete, and milling can only be performed after chamfering is complete, thus proceeding in steps. This patent includes a drill bit, the length of which must be matched to the hole depth; it cannot be too short to ensure the hole depth and the correct chamfering position. Therefore, in the third patent, these three steps are not performed simultaneously. Summary of the Invention

[0010] The technical problem to be solved by the present invention is that although the existing multi-functional cutting tools have solved the technical problems of stopping and clamping and tool setting errors, the improvement in production efficiency is limited. The present invention provides a cutting tool that can improve production efficiency by eliminating the need for stopping and clamping and resetting the tool.

[0011] A tool integrating finishing and tapping is provided, comprising an insert and a tool holder. The insert includes a body and a tip, and the tip includes a finishing tip and a tapping tip. The finishing tip and the tapping tip are arranged side by side on the same insert, with the finishing tip located in front of the tapping tip. There is a height difference between the finishing tip and the tapping tip, and the height difference between the finishing tip and the tapping tip is equal to the depth of the thread.

[0012] The statement that the finishing tool tip is located in front of the tapping tool tip means that after tool setting, the tool tip closer to the workpiece surface to be machined is considered forward. In a finishing and tapping process, finishing is performed first, followed by tapping; therefore, the finishing tool tip is located in front of the tapping tool tip. When the workpiece is on the right side of the tool, the finishing tool tip is closer to the workpiece surface on the right, while the tapping tool tip is on the left.

[0013] In existing threading technology, the rotating surface is first finished before tapping. Therefore, the tapping tool tip described in this application is longer than the finishing tool tip to ensure the thread depth. Existing technology requires two separate clamping operations, two tool settings, and two machining operations for each of the two processes. This application combines the two tool tips, requiring only one clamping operation, one tool setting, and one machining operation using only one tool. That is, finishing and tapping are performed simultaneously, significantly improving production efficiency compared to the step-by-step process of existing technology. It avoids re-clamping and re-setting errors, and eliminates errors caused by shape changes when re-selecting tools, greatly increasing machining accuracy. Structurally, in general tool tip use only the cutting edge on one side, while the other side does not contact the workpiece and mainly serves to increase strength. In this application, the finishing and tapping tool tips are combined, and both are in contact with the workpiece, providing mutual support and increasing strength during machining.

[0014] Furthermore, the distance between the finishing tool tip and the tapping tool tip is between 0.5 and 2 thread pitches.

[0015] Furthermore, the precision turning tool tip and the tapping tool tip are connected by a circular arc transition, and the diameter of the arc is 0.1-0.2mm.

[0016] Furthermore, the precision turning tool tip and the tapping tool tip have a clearance design, that is, during machining, there is a gap between the arc transition and the workpiece.

[0017] There is a rounded transition between the finishing tool tip and the tapping tool tip, which prevents interference with the workpiece during machining. Therefore, the rounded transition has a free-flow design.

[0018] Furthermore, the insert is an indexable insert, and each tip of the indexable insert includes both a finishing cutting tip and a tapping tip. This improves the cost-effectiveness of the insert.

[0019] Furthermore, the body has a triangular structure, with each corner having a cutting tool tip and a tapping tool tip. The body has a screw hole in the middle for mounting screws, and the three corners are evenly distributed at 120 degrees along the axis of the screw hole.

[0020] Furthermore, the end of the handle has a notch with a blade mounting surface, and the blade is mounted in the notch. The blade has a triangular shape, with a positioning surface between its two corners. The shape of the notch matches the shape of the blade, and the two positioning surfaces contact the inner wall of the notch. The blade tip does not contact the inner wall of the notch. A clearance design is provided between the blade tip and the inner wall of the notch to prevent damage to the blade tip.

[0021] Furthermore, the precision turning tool tip, the tapping tool tip, and the body are an integrated structure.

[0022] Furthermore, the cutting edge of the finishing tool tip and the cutting edge of the tapping tool tip are on the same horizontal plane.

[0023] Furthermore, chip-breaking grooves are respectively formed on the rake face of the finishing tool tip and the tapping tool tip.

[0024] Furthermore, a cutting edge band is provided at the transition between the rake face and the flank face of the precision turning tool tip. The cutting edge band increases the thickness of the cutting edge, that is, increases the strength of the cutting edge, and can be used to cut harder workpieces.

[0025] Furthermore, a gasket is fixed between the blade and the blade mounting surface.

[0026] During installation, a shim is placed between the cutting insert and the notching tool mounting surface. The shim is used to adjust the cutting insert angle; different shims are required to adjust the cutting insert angle for different thread diameters. On the other hand, because the cutting insert is much harder than the tool holder, the direct contact between the insert and the tool holder causes the tool holder to wear easily, quickly reducing accuracy. Therefore, from a wear resistance perspective, a tool shim is also necessary. Tool shims with threading tips require different angle adjustments depending on the size of the workpiece being machined; ordinary cutting inserts do not require adjustment and only one is needed.

[0027] The present invention has the following beneficial effects:

[0028] The finishing and tapping tools of this invention arrange two tool tips for adjacent operations side-by-side on the same insert. Specifically, the tool tips for finishing and tapping operations are arranged side-by-side on the same insert. During machining, the finishing tool tip is positioned in front of the tapping tool tip, and the finishing and tapping operations are performed simultaneously. There is a height difference between the finishing tool tip and the tapping tool tip, which is equal to the thread depth. Existing technologies require two separate clamping operations, two tool settings, and two machining operations for each of the two operations. This invention, by combining the two tool tips, only requires one clamping operation, one tool setting, and one machining operation using one insert. That is, the finishing and tapping operations are performed simultaneously, significantly improving production efficiency compared to the step-by-step operation of existing technologies. It avoids re-clamping and re-setting errors, and eliminates errors caused by shape changes due to tool re-selection, greatly increasing machining accuracy. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0030] In the picture:

[0031] Figure 1 A schematic diagram of an indexable cutting tool with eight cutting tips;

[0032] Figure 2 A schematic diagram of an indexable cutting tool with 16 cutting tips;

[0033] Figure 3 A schematic diagram of a finishing insert with three cutting edges in the prior art;

[0034] Figure 4 A schematic diagram of a three-pointed tapping insert structure in the prior art;

[0035] Figure 5 This is a partial view of the cutting tip portion of the integrated precision turning and tapping tool of the present invention;

[0036] Figure 6 This is a schematic diagram of the integrated precision turning and tapping tool structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the insert structure of the precision turning and tapping integrated tool of the present invention;

[0038] Figure 8 This is a diagram showing the position of the tool and workpiece that integrates precision turning and tapping in this invention.

[0039] Figure 9 This is a diagram showing the position of the blade and notch in this invention.

[0040] The serial numbers are: 1-Insert tool, 11-Precision turning tool tip, 12-Tapping tool tip, 13-Body, 14-Circular transition, 15-Screw hole, 16-Locating surface, 17-Chip breaker groove, 18-Cutting edge, 2-Tool holder, 21-Notch, 3-Workpiece. Detailed Implementation

[0041] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0042] Example 1

[0043] This embodiment provides a tool that integrates precision turning and tapping, such as... Figure 6 As shown, it includes a blade 1 and a handle 2, as... Figure 5As shown, the cutting tool 1 includes a body 13 and a cutting tip. The cutting tip includes a finishing cutting tip 11 and a tapping cutting tip 12. The finishing cutting tip 11 and the tapping cutting tip 12 are arranged side by side on the same cutting tool 1, with the finishing cutting tip 11 located in front of the tapping cutting tip 12. There is a height difference between the finishing cutting tip 11 and the tapping cutting tip 12, and the height difference between the finishing cutting tip 11 and the tapping cutting tip 12 is equal to the depth of the thread.

[0044] like Figure 3 and Figure 4 As shown, these are the precision turning tool tip and the tapping tool tip of the prior art. In the prior art, the rotating surface is first precision machined before tapping. Therefore, the tapping tool tip 12 described in this application is longer than the precision turning tool tip 11 to ensure the thread depth. The prior art requires two separate clamping operations, two tool setting operations, and two machining operations for each of the two processes. With the two tool tips combined in this application, only one clamping operation, one tool setting operation, and one machining operation are needed, meaning the precision turning and tapping processes are performed simultaneously. Compared to the step-by-step operation of the prior art, this significantly improves production efficiency. It avoids re-clamping and re-setting errors, and eliminates errors caused by changes in tool shape due to tool re-selection, greatly increasing machining accuracy. Structurally, in general tool tips, only the cutting edge on one side is in use, while the other side does not contact the workpiece and mainly serves to increase strength. In this application, the precision turning tool tip 11 and the tapping tool tip 12 are combined, and both are in contact with the workpiece, providing mutual support and increasing strength during machining.

[0045] The distance between the finishing turning tool tip 11 and the tapping tool tip 12 is between 0.5 and 2 thread pitches. The finishing turning tool tip 11 and the tapping tool tip 12 are connected by a circular arc transition, and the diameter of the arc is 0.1-0.2 mm.

[0046] The finishing turning tool tip 11 and the tapping tool tip 12 have a clearance design, meaning that during machining, there is a gap between the arc transition section 14 and the workpiece. The arc transition section 14 between the finishing turning tool tip 11 and the tapping tool tip 12 prevents interference with the workpiece during machining; therefore, the arc transition section 14 has a clearance design.

[0047] The precision turning tool tip 11, the tapping tool tip 12, and the body 13 are an integrated structure.

[0048] The cutting edge of the precision turning tool tip 11 and the cutting edge of the tapping tool tip 12 are on the same horizontal plane.

[0049] A cutting edge band 18 is also provided at the transition between the rake face and the flank face of the precision turning tool tip 11. The cutting edge band 18 increases the thickness of the cutting edge, that is, increases the strength of the cutting edge, and can be used to cut harder workpieces.

[0050] A gasket is also fixed between the blade 1 and the blade mounting surface.

[0051] The first patent in the background technology combines an external turning tool and a sealing surface tool into one, allowing a single tool to machine the outer diameter, end face, and sealing surface of a product. As shown in the attached drawings, this tool includes two cutting heads. It's important to note that this involves two inserts (not two cutting tips) on a tool holder. While this reduces the number of clamping operations, a tool change and setting are still required for the second machining operation; the two operations are completed independently. This embodiment differs from this patent. In this embodiment, the tool has one insert on the tool holder, and the cutting tip on the insert includes both a finishing cutting tip 11 and a tapping cutting tip 12. The two operations are completed simultaneously, not in steps. The second patent in the background technology, like the first patent, has more cutting heads, merely increasing the tool's cost-effectiveness. The first and second patents in the background technology are actually indexable inserts. After completing one operation, the next operation requires changing the tool position and using a different insert or cutting tip. Their multiple cutting tips are arranged vertically, similar to... Figure 1 , Figure 2 The structure of the indexable insert is similar. The third patent in the background technology, because it involves machining holes and milling surfaces, allows one drill bit to continuously complete three processes: drilling, chamfering, and milling. Compared to the first and second patents, it eliminates the need for tool re-setting, but these three processes are still completed independently. The biggest difference between this embodiment and the three patents in the background technology is that the two processes are completed simultaneously. By placing two tool tips side-by-side at one of the original tool tips in the insert structure, with the finishing tool tip 11 located in front of the tapping tool tip 12, the work that originally required two clamping, two tool setting, and two machining operations can be completed in one clamping, one tool setting, and one machining operation. The different structure results in higher machining efficiency, higher machining accuracy, and better economy.

[0052] Example 2

[0053] This embodiment provides a tool that integrates precision turning and tapping, such as... Figure 6 As shown, it includes a blade 1 and a handle 2, as... Figure 5As shown, the cutting tool 1 includes a body 13 and a cutting tip. The cutting tip includes a finishing cutting tip 11 and a tapping cutting tip 12. The finishing cutting tip 11 and the tapping cutting tip 12 are arranged side by side on the same cutting tool 1, with the finishing cutting tip 11 located in front of the tapping cutting tip 12. There is a height difference between the finishing cutting tip 11 and the tapping cutting tip 12, and the height difference between the finishing cutting tip 11 and the tapping cutting tip 12 is equal to the depth of the thread.

[0054] The distance between the finishing turning tool tip 11 and the tapping tool tip 12 is between 0.5 and 2 thread pitches. The finishing turning tool tip 11 and the tapping tool tip 12 are connected by a circular arc transition, and the diameter of the arc is 0.1-0.2 mm.

[0055] The precision turning tool tip 11 and the tapping tool tip 12 have a clearance design, that is, during machining, there is a gap between the arc transition 14 and the workpiece.

[0056] The cutting tool 1 is an indexable cutting tool, and each tip of the indexable cutting tool includes a finishing cutting tip 11 and a tapping cutting tip 12. For example... Figure 7 As shown, the body 13 has a triangular structure, and each corner of the blade has a precision turning tip 11 and a tapping tip 12. The body 13 has a screw hole 15 for mounting screws in the middle, and the three corners are evenly distributed at 120 degrees along the axis of the screw hole 15.

[0057] like Figure 9 As shown, the end of the handle 2 has a notch 21, and the notch 21 has a blade mounting surface. The blade 1 is installed in the notch 21. The blade 1 has a triangular shape, with positioning surfaces 16 between its two corners. The shape of the notch 21 is adapted to the shape of the blade, and the two positioning surfaces 16 are in contact with the inner wall of the notch 21. The blade tip is not in contact with the inner wall of the notch 21. A clearance design is made between the blade tip and the inner wall of the notch 21 to avoid damaging the blade tip.

[0058] The precision turning tool tip 11, the tapping tool tip 12, and the body 13 are an integrated structure.

[0059] The cutting edge of the precision turning tool tip 11 and the cutting edge of the tapping tool tip 12 are on the same horizontal plane.

[0060] A cutting edge band 18 is also provided at the transition between the front and rear cutting surfaces of the precision turning tool tip 11.

[0061] A gasket is also fixed between the blade 1 and the blade mounting surface.

[0062] The difference between this embodiment and Embodiment 1 is that the blade 1 is an indexable blade, and each blade includes 3 cutting tips. Each cutting tip is provided with a finishing cutting tip and a tapping cutting tip, which improves the cost performance of the blade.

[0063] Example 3

[0064] This embodiment provides a tool that integrates precision turning and tapping, such as... Figure 6 As shown, it includes a blade 1 and a handle 2, as... Figure 5 As shown, the cutting tool 1 includes a body 13 and a cutting tip. The cutting tip includes a finishing cutting tip 11 and a tapping cutting tip 12. The finishing cutting tip 11 and the tapping cutting tip 12 are arranged side by side on the same cutting tool 1, with the finishing cutting tip 11 located in front of the tapping cutting tip 12. There is a height difference between the finishing cutting tip 11 and the tapping cutting tip 12, and the height difference between the finishing cutting tip 11 and the tapping cutting tip 12 is equal to the depth of the thread.

[0065] The distance between the finishing turning tool tip 11 and the tapping tool tip 12 is between 0.5 and 2 thread pitches. The finishing turning tool tip 11 and the tapping tool tip 12 are connected by a circular arc transition, and the diameter of the arc is 0.1-0.2 mm.

[0066] The finishing turning tool tip 11 and the tapping tool tip 12 have a clearance design, meaning that during machining, there is a gap between the arc transition section 14 and the workpiece. The arc transition section 14 between the finishing turning tool tip 11 and the tapping tool tip 12 prevents interference with the workpiece during machining; therefore, the arc transition section 14 has a clearance design.

[0067] The precision turning tool tip 11, the tapping tool tip 12, and the body 13 are an integrated structure.

[0068] The cutting edge of the precision turning tool tip 11 and the cutting edge of the tapping tool tip 12 are on the same horizontal plane.

[0069] Chip breaker grooves 17 are respectively opened on the rake face of the finishing tool tip 11 and the tapping tool tip 12 (the chip breaker grooves of the tapping tool tip are not shown).

[0070] A cutting edge band 18 is also provided at the transition between the rake face and the flank face of the precision turning tool tip 11. The cutting edge band 18 increases the thickness of the cutting edge, that is, increases the strength of the cutting edge, and can be used to cut harder workpieces.

[0071] A gasket is also fixed between the blade 1 and the blade mounting surface.

[0072] The difference between this embodiment and embodiment 1 is that chip breaking grooves 17 are respectively opened on the rake face of the finishing tool tip 11 and the tapping tool tip 12.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A combination finishing and tapping tool comprising a blade and a shank, the blade comprising a body and a tip, characterized in that, The tool tip includes a finishing tool tip and a tapping tool tip; the finishing tool tip and the tapping tool tip are arranged side by side on the same blade, and the finishing tool tip is in front of the tapping tool tip; the finishing tool tip and the tapping tool tip have a height difference, and the height difference between the finishing tool tip and the tapping tool tip is equal to the depth of the thread.

2. The combination finish cutting and tapping tool according to claim 1, wherein The distance between the finishing tool tip and the tapping tool tip is between 0.5 and 2 pitches.

3. The combination finish cutting and tapping tool according to Claim 1 wherein, The finishing tool tip and the tapping tool tip are connected by a circular arc transition, and the diameter of the circular arc is 0.1-0.2mm.

4. The combination finish cutting and tapping tool according to claim 3, wherein The finishing tool tip and the tapping tool tip have a space design, that is, there is a gap between the circular arc transition and the workpiece during machining.

5. The combination finish cutting and tapping tool of claim 1 wherein, The blade is an indexable blade, and each tool tip of the indexable blade includes the finishing tool tip and the tapping tool tip.

6. The combination finish cutting and tapping tool of claim 5 wherein, The body is in a triangular shape structure, and each corner of the blade contains the finishing tool tip and the tapping tool tip; the body is provided with a screw hole for mounting a screw, and the three corners are uniformly distributed at an angle of 120 degrees according to the axis of the screw hole.

7. The combination finish cutting and tapping tool of claim 1 wherein, The finishing tool tip and the tapping tool tip and the body are in an integrated structure.

8. The combination finish cutting and tapping tool of claim 1 wherein, The cutting edge of the finishing tool tip and the cutting edge of the tapping tool tip are on the same horizontal plane.

9. The combination finish cutting and tapping tool of claim 1 wherein, A chip breaker groove is formed on the rake face of the finishing tool tip and the tapping tool tip.

10. The combination finish cutting and tapping tool of claim 6 wherein, The end of the tool shank is provided with a notch, and the notch has a blade mounting surface; the blade is mounted in the notch; the triangular-shaped blade has two positioning surfaces between the two corners; the shape of the notch is matched with the shape of the blade, and the two positioning surfaces are in contact with the inner wall of the notch; the tool tip is not in contact with the inner wall of the notch.

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