Compound tool for machining threaded hole

Abstract

The compound tool for machining the threaded hole comprises a drill tip, a tool body front section, a tool body middle section, a tool body rear section and a tool body handle, at least two spiral cutting edges used for drilling holes are evenly distributed in the circumferential direction of the tool body front section, and two spiral chip grooves are distributed between the two spiral cutting edges. The spiral chip groove spirally extends to the cutter body middle section, the cutter body rear section is connected to the cutter body handle, the spiral cutting edge spirally extends to the cutter body middle section, the spiral cutting edge located in the cutter body middle section is provided with a spiral reaming edge used for reaming, and the cutter body rear section is provided with a threaded edge used for tapping. According to the composite tool for machining the threaded hole, machining of the threaded hole can be achieved only through one tool, and the problem that the machining precision of the threaded hole is reduced due to positioning errors caused by tool changing of multiple tools is solved. And meanwhile, the machining time can also be shortened, and the machining efficiency of the threaded hole is improved.

Description

A composite tool for machining threaded holes Technical Field

[0001] This invention relates to the field of cutting tools, and more particularly to a composite cutting tool for machining threaded holes. Background Technology

[0002] In the machining process of parts, the machining of threaded holes is an important step. The machining of threaded holes in conventional parts generally involves rough drilling with a drill bit, finishing with a reamer, and finally tapping with a tap.

[0003] In the process of developing the existing technology, the inventors discovered that:

[0004] Multiple tool changes can easily lead to positioning errors, resulting in a decrease in the accuracy of threaded hole machining. At the same time, the time cost incurred by multiple tool changes is also high, resulting in low accuracy of the final machined threaded hole and low machining efficiency.

[0005] Therefore, this application provides a composite tool that improves machining efficiency while ensuring the quality of threaded hole machining, in order to solve the problems of decreased accuracy and low machining efficiency caused by positioning errors in threaded hole machining in the prior art. Summary of the Invention

[0006] The main technical problem solved by this invention is to provide a composite tool that improves machining efficiency while ensuring the quality of threaded hole machining, so as to solve the problems of decreased accuracy and low machining efficiency caused by positioning errors in threaded hole machining in the prior art.

[0007] This application provides a tool for machining threaded stepped holes, including:

[0008] The tool includes a drill tip, a front section of the tool body, a middle section of the tool body, a rear section of the tool body, and a tool shank. The front section of the tool body has at least two helical cutting edges evenly distributed circumferentially for drilling. There are two helical chip removal grooves distributed between the two helical cutting edges. The helical chip removal grooves extend helically to the middle section of the tool body and are connected to the tool shank at the rear section of the tool body. The helical cutting edges extend helically to the middle section of the tool body. The helical cutting edge located in the middle section of the tool body is provided with a helical reaming edge for reaming. The rear section of the tool body is provided with a threading edge for tapping.

[0009] Furthermore, the helical cutting edge located in the middle section of the tool body is provided with a helical reaming edge for reaming holes, specifically including:

[0010] The spiral cutting edge is located on both sides of the spiral chip removal groove in the middle section of the tool body, and spiral reaming edges for reaming are respectively provided.

[0011] Furthermore, a sub-helical chip removal groove is provided at the middle position of the end face of the helical cutting edge located in the middle section of the tool body.

[0012] Furthermore, one end of the sub-spiral chip removal groove spirally penetrates the middle section of the cutter body to the connection point at the rear section of the cutter body.

[0013] Furthermore, the cutting diameter d1 of the front section of the cutter body is determined according to the diameter of the connecting hole to be machined, specifically including:

[0014] Aperture - D1 = 0.3 mm.

[0015] Furthermore, the relationship between the inner diameter d3 and the outer diameter d4 of the threaded cutting edge of the rear section of the cutter body is d4-d3=0.2mm.

[0016] Furthermore, the relationship between the outer diameter d4 of the thread cutting edge at the rear section of the cutter body and the cutting edge diameter d2 at the middle section of the cutter body is d2-d4=0.1mm.

[0017] Furthermore, the connection between the tool body and the tool holder and the rear section of the tool body is provided with a chamfer, which is used to chamfer the opening of the hole to be machined.

[0018] The embodiments provided in this application have at least the following beneficial effects: The composite tool for machining threaded holes provided in this application enables the machining of threaded holes using only one tool, reducing the positioning errors caused by changing multiple tools, which in turn leads to a decrease in the machining accuracy of the threaded holes. Simultaneously, the composite tool of this application also reduces machining time, thereby improving the machining efficiency of threaded holes. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 is a schematic diagram of the composite tool structure for machining threaded holes provided in this application;

[0021] Figure 2 is a schematic diagram of the composite tool for machining threaded holes provided in this application from another angle.

[0022] Figure Labels

[0023] A composite tool for machining threaded holes - 100; drill tip - 1; front section of tool body - 2; middle section of tool body - 3; rear section of tool body - 4; tool body shank - 5;

[0024] Spiral cutting edge-20; spiral chip removal groove-21; spiral reamer-30; sub-spiral chip removal groove-31; thread cutting edge-40. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Please refer to Figures 1 and 2. A composite tool 100 for machining threaded holes provided in this application includes: a drill tip 1, a front section 2 of the tool body, a middle section 3 of the tool body, a rear section 4 of the tool body, and a tool shank 5. The front section 2 of the tool body has at least two helical cutting edges 20 evenly distributed around its circumference for drilling. Two helical chip removal grooves 21 are distributed between the two helical cutting edges 20. The helical chip removal grooves 21 extend helically to the middle section 3 of the tool body and are connected to the tool shank 5 of the tool body. The helical cutting edges 20 extend helically to the middle section 3 of the tool body. The helical cutting edges 20 located in the middle section 3 of the tool body are provided with helical reaming edges 30 for reaming holes. The rear section 4 of the tool body is provided with threading edges 40 for tapping.

[0027] Specifically, this application replaces the previous method of machining threaded holes using a composite tool, which required drills, reamers, and taps. It's conceivable that using only one tool to perform drilling, reaming, and tapping can largely avoid errors caused by multiple tool changes, thereby improving the machining accuracy of the threaded holes. At the same time, the machining cycle time will also be faster, increasing the machining efficiency of the threaded holes.

[0028] In the cutting tool provided in this application, the drill tip 1 is mainly used for positioning the threaded hole. In order to realize the machining of the threaded hole, the helical cutting edge 20 of the front section 2 of the tool body is set to realize the drilling of the threaded hole, the thread reaming edge of the middle section 3 of the tool body is used for fine reaming to meet the machining requirements of high-precision holes, and the thread machining is realized by the threading edge 40 of the rear section 4 of the tool body.

[0029] It should be noted that the cutting edge of the front section 2 of the tool body can be two or more. In a preferred embodiment provided in this application, two helical cutting edges 20 are evenly distributed in the front section 2 of the tool body, and two helical chip removal grooves 21 are directly set on the two cutting edges.

[0030] In this application, the helical chip removal groove 21 extends to the middle section 3 of the tool body, and the rear section 4 of the tool body is connected to the tool holder 5, which facilitates the discharge of cutting chips. The helical cutting edge 20 extends to the middle section 3 of the tool body, and this setting is mainly used for the installation of the helical reamer 30 in the middle section 3 of the tool body.

[0031] In a preferred embodiment provided in this application, the cutting of the front section 2 of the cutter body adopts a left-handed, right-handed cutting motion to remove chips downwards, thus preventing chip blockage.

[0032] The helical reaming edge 30 of the middle section 3 of the cutter body is provided on the helical cutting edge 20 extending from the front section 2 of the cutter body to the middle section 3 of the cutter body. Specifically, it includes: helical reaming edges 30 for reaming are respectively provided on both sides of the end face of the helical cutting edge 20 of the middle section 3 of the cutter body near the helical chip removal groove 21.

[0033] If the front section 2 of the tool body has two helical cutting edges 20, then the middle section 3 of the tool body has four helical reamers 30. It can be understood that the helical reamers 30 are mainly used to further process the hole cut by the helical cutting edges 20 to ensure the quality of the threaded hole.

[0034] Furthermore, a sub-helical chip removal groove 31 is provided at the middle position of the end face of the helical cutting edge 20 located in the middle section 3 of the cutter body.

[0035] Specifically, the spiral cutting edge 20 has spiral hinge edges 30 at both ends of the middle section 3 of the tool body, and a sub-spiral chip removal groove 31 is provided at the middle position of the end face of the spiral cutting edge 20, that is, between the two spiral hinge edges 30, so as to facilitate the discharge of waste chips cut by the spiral hinge edge 30.

[0036] Furthermore, one end of the sub-spiral chip removal groove 31 spirally penetrates the middle section 3 of the cutter body to the connection point of the rear section 4 of the cutter body.

[0037] Specifically, this design allows the chips cut by the helical reamer 30 to fall into the sub-helical chip removal groove 31 and be discharged at the position where the rear section 4 of the tool body connects to the middle section 3. It can be understood that the chips can be discharged directly through the rear section 4 of the tool body, or they can flow into the helical chip removal groove 21 from the rear section 4 of the tool body and be discharged.

[0038] Furthermore, in this application, the diameter of the cutting edge 2 of the front section of the cutter body is determined based on the diameter of the helical bore to be machined. It is understood that, to allow for machining allowance in the subsequent machining of the helical reamer 30, the diameter of the cutting edge 2 of the front section of the cutter body can be set to be smaller than the helical bore diameter. In a preferred embodiment provided in this application, the preferred bore diameter -D1 = 0.3 mm.

[0039] Furthermore, the inner diameter d3 and outer diameter d4 of the threaded cutting edge 40 of the rear section 4 of the cutter body are determined according to the requirements of the threaded hole. In a preferred embodiment provided in this application, according to the machining requirements of the threaded hole, the relationship between the inner diameter d3 and outer diameter d4 of the threaded cutting edge 40 of the rear section 4 of the cutter body is set as d4-d3=0.2mm.

[0040] It should also be understood that the machining of the threaded hole in the front section 2 of the cutter body requires a certain machining allowance to be left for the machining of the middle section 3 and the rear section 4 of the cutter body. The machining of the middle section 3 requires allowance to be left for the rear section 4. In a preferred embodiment provided in this application, the relationship between the outer diameter d4 of the thread cutting edge 40 of the rear section 4 and the cutting edge diameter d2 of the middle section 3 is d2-d4=0.1mm.

[0041] It should also be understood that the lengths of the front section 2, middle section 3, and rear section 4 of the cutter body are also determined further according to the threaded hole to be machined.

[0042] Furthermore, a chamfer is provided at the connection position between the tool holder 5 and the rear section 4 of the tool body for chamfering the opening of the hole to be machined. It can be understood that after drilling, reaming, and tapping with the thread cutting edge 40, a chamfer can be provided at the connection position between the tool holder 5 and the rear section 4 of the tool body to facilitate the chamfering of the opening. In a preferred embodiment provided in this application, the chamfer angle between the tool holder 5 and the thread cutting edge 40 of the rear section 4 of the tool body is preferably 45°.

[0043] The composite tool 100 for machining threaded holes provided in this application enables the machining of threaded holes using only one tool, reducing the positioning errors caused by changing multiple tools, which in turn leads to a decrease in the machining accuracy of the threaded holes. At the same time, the composite tool of this application also reduces machining time, thereby improving the machining efficiency of threaded holes.

[0044] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A composite tool for machining threaded holes, comprising: A drill tip, a front section of the drill body, a middle section of the drill body, a rear section of the drill body, and a shank of the drill body, characterized in that: at least two helical cutting edges for drilling are evenly distributed circumferentially in the front section of the drill body, two helical chip removal grooves are distributed between the two helical cutting edges, the helical chip removal grooves extend helically to the middle section of the drill body, the rear section of the drill body is connected to the shank of the drill body, the helical cutting edges extend helically to the middle section of the drill body, the helical cutting edges located in the middle section of the drill body are provided with helical reaming edges for reaming, and the rear section of the drill body is provided with threading edges for tapping.

2. The composite cutting tool as described in claim 1, characterized in that, The helical cutting edge located in the middle section of the tool body is provided with a helical reaming edge for reaming holes. Specifically, the helical cutting edge located in the middle section of the tool body has helical reaming edges for reaming holes on both sides of the end face of the helical cutting edge near the helical chip removal groove.

3. The composite cutting tool as described in claim 2, characterized in that, A sub-helical chip removal groove is also provided at the middle position of the end face of the helical cutting edge located in the middle section of the cutter body.

4. The composite cutting tool as described in claim 3, characterized in that, One end of the sub-spiral chip removal groove spirals through the middle section of the cutter body to the connection point at the rear section of the cutter body.

5. The composite cutting tool as described in claim 1, characterized in that, The cutting diameter d1 of the front section of the cutter body is determined according to the diameter of the spiral hole to be processed, specifically including: hole diameter - D1 = 0.3mm.

6. The composite cutting tool as described in claim 1, characterized in that, The relationship between the inner diameter d3 and the outer diameter d4 of the threaded cutting edge of the rear section of the cutter body is d4-d3=0.2mm.

7. The composite cutting tool as described in claim 6, characterized in that, The relationship between the outer diameter d4 of the thread cutting edge at the rear section of the cutter body and the cutting edge diameter d2 at the middle section of the cutter body is d2-d4=0.1mm.

8. The composite cutting tool as described in claim 1, characterized in that, The connection between the tool holder and the rear section of the tool body is chamfered to chamfer the opening of the hole to be machined.

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