Composite thread machining tool and machining method

Abstract

The present application relates to the technical field of thread processing, and discloses a composite thread processing cutter and a processing method, aiming at solving the problem that the existing composite thread processing cutter cannot meet the precision requirement of thread holes in one-time processing. The present application comprises a cutter handle, a thread processing blade and a thread bottom hole processing blade which are connected in sequence and coaxially arranged. When the cutter is fed forward, the thread processing blade and the thread bottom hole processing blade complete the processing of thread bottom holes and threads. In order to complete the processing of threads and the correction of thread tooth forms in one time and improve the precision of threads, a thread bottom hole correction blade is arranged in the same axial length section part of the thread bottom hole processing blade, and the cutting direction of the thread bottom hole correction blade is opposite to that of the thread bottom hole processing blade. A thread correction blade is arranged in the same axial length section part of the thread processing blade, and the cutting direction of the thread correction blade is opposite to that of the thread processing blade. When the cutter is fed backward, the thread bottom hole correction blade and the thread correction blade complete the correction of thread bottom holes and thread tooth forms.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thread machining, and in particular to a composite thread machining tool and a machining method. BACKGROUND

[0002] Current machining has problems such as burrs, thermal expansion and contraction, deformation, etc. in machining thread holes due to the influence of factors such as materials, tools and processes, which affect the size, shape, surface roughness, etc. of the thread, and also affect the dimensional accuracy of the thread bottom hole. Usually, the thread tooth and the thread bottom hole need to be secondarily machined to correct them, so as to meet the technical parameter requirements of the thread hole. In the machining process, the thread bottom hole, the thread and the correction of the thread and the bottom hole need to be machined in three steps, and the entire thread hole machining can be completed through three times of machining, which needs complex tool mounting, hole alignment and calibration, slow machining speed, complex machining program, and relatively low precision of the machined thread hole.

[0003] In order to simplify the machining program, the prior art CN104625254A discloses a composite thread tool, which comprises a drill head part, a reamer, a tapping thread part, and the top end of the tool is provided with the drill head part, the rear of the drill head part is provided with the reamer, and the rear of the reamer is provided with the tapping thread part. The above patent completes drilling, reaming and tapping at one time, but does not correct the machined thread and bottom hole at the same time, and cannot meet the precision requirements of the thread hole. SUMMARY

[0004] The present application provides a composite thread machining tool and a machining method, which aims to solve the problem that the existing composite thread machining tool cannot meet the precision requirements of the thread hole in one-time machining.

[0005] The technical scheme adopted by the present application to solve the technical problem is that the composite thread machining tool comprises a composite thread machining tool, a thread machining blade and a thread bottom hole machining blade, the shank is connected to one end of the thread machining blade, the other end of the thread machining blade is connected to the thread bottom hole machining blade, the shank, the thread machining blade and the thread bottom hole machining blade are coaxially arranged, the cutting directions of the thread machining blade and the thread bottom hole machining blade are the same, in order to complete the machining of the thread and the correction of the thread tooth at one time, reduce the machining program and improve the thread precision, the composite thread machining tool further comprises a thread bottom hole correction blade and a thread correction blade. The thread bottom hole correction blade and the thread bottom hole machining blade are located in the same axial length section of the composite thread machining tool, and the cutting directions of the thread bottom hole correction blade and the thread bottom hole machining blade are opposite; the thread correction blade and the thread machining blade are located in the same axial length section of the composite thread machining tool, and the cutting directions of the thread correction blade and the thread machining blade are opposite.

[0006] Further, in order to control the outflow direction of the chips, keep the precision of the machined surface, reduce the cutting resistance and prolong the life of the cutting edge, the thread bottom hole correction edge and the thread bottom hole machining edge are provided with a chip removal groove; the thread correction edge and the thread machining edge are provided with a chip removal groove.

[0007] Further, the chip removal groove is a spiral groove.

[0008] Further, the chip removal groove is a straight groove.

[0009] The composite thread machining method is processed by using the composite thread machining tool according to any one of claims 1 to 4, and the method comprises the following steps: step one, fixing and installing the tool handle on the machine tool; step two, rotating and feeding the thread machining edge and the thread bottom hole machining edge at the same time by the tool handle, the thread bottom hole machining edge completes the preliminary machining of the thread bottom hole in advance, and the thread machining edge completes the preliminary machining of the thread in the rear; step three, rotating and retreating the composite thread machining tool towards the opposite direction of the feeding by the tool handle, and the thread bottom hole correction edge and the thread correction edge complete the correction and finishing machining of the thread bottom hole and the thread profile.

[0010] The beneficial effects of the present application are: in order to complete the machining of the thread bottom hole and the thread, and the correction of the thread profile and the bottom hole at one time, reduce the machining procedure and improve the thread precision, the thread bottom hole correction edge and the thread bottom hole machining edge are located in the same axial length section part of the composite thread machining tool, and the cutting directions of the thread bottom hole correction edge and the thread bottom hole machining edge are opposite; the thread correction edge and the thread machining edge are located in the same axial length section part of the composite thread machining tool, and the cutting directions of the thread correction edge and the thread machining edge are opposite. The thread bottom hole correction edge and the thread bottom hole machining edge are provided with a chip removal groove, and the thread correction edge and the thread machining edge are provided with a chip removal groove, which are used to control the outflow direction of the chips, keep the precision of the machined surface, reduce the cutting resistance and prolong the life of the cutting edge. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a front view of the composite thread machining tool.

[0012] Figure 2 It is a top view of the composite thread machining tool.

[0013] In the figure, the marks are: tool handle 1, thread machining edge 2, thread bottom hole correction edge 3, thread bottom hole machining edge 4, thread correction edge 5. DETAILED DESCRIPTION

[0014] The present application will be further described below in combination with the drawings and examples.

[0015] As Figure 1As shown, the composite threading tool includes a tool holder 1, a threading cutting edge 2, and a thread hole machining edge 4. The tool holder 1 is connected to one end of the threading cutting edge 2, and the other end of the threading cutting edge 2 is connected to the thread hole machining edge 4. The tool holder 1, the threading cutting edge 2, and the thread hole machining edge 4 are coaxially arranged. The cutting edge directions of the threading cutting edge 2 and the thread hole machining edge 4 are the same, so their cutting directions are the same, and they all rotate in the direction of thread rotation during feeding. In order to complete the correction of the thread profile and the thread hole in one step after completing the machining of the hole and the thread, and at the same time avoid the problem of low thread accuracy caused by low form and position tolerance accuracy such as coaxiality and position accuracy of the thread and the thread hole during step machining, the composite threading tool is also provided with a thread hole correction edge 3 and a thread correction edge 5. The thread hole correction cutting edge 3 and the thread hole machining edge 4 are located on the same axial length segment of the compound thread machining tool, and their cutting directions are opposite. Similarly, the thread correction cutting edge 5 and the thread machining edge 2 are located on the same axial length segment of the compound thread machining tool, and their cutting directions are also opposite. The compound thread machining tool is mounted on the machine tool via the tool holder 1. During operation, the tool holder 1 drives the thread machining edge 2 and the thread hole machining edge 4 to rotate and feed simultaneously. The thread hole machining edge 4 completes the preliminary machining of the thread hole in front, and the thread machining edge 2 completes the preliminary machining of the thread behind. When the tool stops feeding, the low-level and thread machining steps are completed. Afterwards, the tool holder 1 drives the compound thread machining tool to rotate and retract in the opposite direction of feed, using the reverse cutting of the thread hole correction cutting edge 3 and the thread correction cutting edge 5 to complete the correction and finishing of the thread hole and thread profile.

[0016] During the machining process, the compound thread machining tool can be rotated only, the workpiece can be rotated only, or the compound thread machining tool and the workpiece can be rotated simultaneously.

[0017] Among them, composite thread machining tools can be manufactured in different specifications and models according to the size of the thread.

[0018] like Figure 2 As shown, in a preferred embodiment of the present invention, the number of cutting edges of the thread hole machining edge 4 and the thread hole correction edge 3 are different, and the number of cutting edges of the thread machining edge 2 and the thread correction edge 5 are also different. Depending on different actual situations, the number of cutting edges of the thread hole machining edge 4 and the thread hole correction edge 3, and the number of cutting edges of the thread machining edge 2 and the thread correction edge 5, can be the same or different.

[0019] To control the direction of chip flow, maintain the accuracy of the machined workpiece surface, reduce cutting resistance, and extend tool life, a chip removal groove is provided between the thread-cutting cutting edge 4 and the thread-cutting correction cutting edge 3; a chip removal groove is provided between the thread-cutting cutting edge 2 and the thread-correcting cutting edge 5. The chip removal groove can be a spiral groove or a straight groove.

[0020] In addition, when chip machining is performed, a chip groove can be arranged between the thread machining blades 2; when chipless machining such as extrusion is performed, the chip groove can not be arranged between the thread machining blades 2. The chip groove can be selected as a helical groove or a straight groove;

[0021] Preferably, in order to increase versatility and reduce cost, the chip groove is a straight groove.

Claims

1. A compound thread cutting tool comprising a shank (1), a thread cutting blade (2) and a thread bottom hole cutting blade (4), the shank (1) is connected to one end of the thread cutting blade (2), the other end of the thread cutting blade (2) is connected to the thread bottom hole cutting blade (4), the shank (1), the thread cutting blade (2) and the thread bottom hole cutting blade (4) are coaxially arranged, the cutting directions of the thread cutting blade (2) and the thread bottom hole cutting blade (4) are the same, characterized in that: The composite thread machining tool further comprises a thread bottom hole correction blade (3) and a thread correction blade (5), the thread bottom hole correction blade (3) and the thread bottom hole machining blade (4) are located in the same axial length section of the composite thread machining tool, and the cutting directions of the thread bottom hole correction blade (3) and the thread bottom hole machining blade (4) are opposite; the thread correction blade (5) and the thread machining blade (2) are located in the same axial length section of the composite thread machining tool, and the cutting directions of the thread correction blade (5) and the thread machining blade (2) are opposite. ​ 2. The composite thread machining tool of claim 1, wherein: A chip removal groove is arranged between the thread bottom hole correction blade (3) and the thread bottom hole machining blade (4).

3. The composite thread machining tool of claim 2, wherein: The chip removal groove is a spiral groove.

4. The composite thread machining tool of claim 2, wherein: The chip removal groove is a straight groove.

5. A method of machining a composite thread, characterized in that: The method for machining by using the composite thread machining tool according to any one of claims 1 to 4 comprises the following steps: Step one: fixing and installing the tool holder (1) on the machine tool; Step two: rotating and feeding the thread machining blade (2) and the thread bottom hole machining blade (4) simultaneously by the tool holder (1), the thread bottom hole machining blade (4) completes the preliminary machining of the thread bottom hole in advance, and the thread machining blade (2) completes the preliminary machining of the thread; Step three: rotating and retreating the composite thread machining tool in the opposite direction of the feeding by the tool holder (1), and the thread bottom hole correction blade (3) and the thread correction blade (5) complete the correction and finishing machining of the thread bottom hole and the thread profile.

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