Carbon steel multi-step screw tap structure with inner chip containing groove

Abstract

The utility model discloses a carbon steel multi-step screw tap structure with an inner chip containing groove, and relates to the technical field of screw taps. The carbon steel multi-step screw tap structure with the inner chip containing groove comprises a transmission rod, a chip removal hole is formed in the top end of the transmission rod, a chip removal pipe is arranged in the transmission rod, and a tapping mechanism is arranged below the transmission rod; a screw tap assembly is arranged at the bottom end of the transmission rod and used for cutting the inner wall of a pipe; the chip removal assembly comprises a rubber column fixedly installed in the transmission rod, balls are movably installed on the fixed lower portion of the interior of the rubber column, the chip removal assembly further comprises a limiting rod movably installed below the transmission rod, and through a disc-shaped protrusion at the top end of the limiting rod, the moving direction of the limiting rod can be limited, and the limiting rod is prevented from sliding off; metal chips can enter the chip containing groove in the cutting process, and after cutting is completed, the auger on the outer side of the limiting rod can be driven to rotate through the bottom end of the limiting rod so that the metal chips in the chip containing groove can be discharged.

Description

Technical Field

[0001] This utility model relates to the field of tap technology, specifically to a carbon steel multi-stage tap structure with internal chip grooves. Background Technology

[0002] Taps are standard tools for machining cylindrical and conical internal threads. They are cutting tools for machining various medium and small-sized internal threads. They have a simple structure and are easy to use. They can be operated manually or on a machine tool.

[0003] The existing Chinese utility model patent with publication number CN216607534U discloses a wear-resistant tap with an internal groove, including a cone (1), a shank (2) at the bottom of the cone (1), a through hole (3) at the bottom of the shank (2), a chip groove (4) at the top of the cone (1), the chip groove (4) being connected to the through hole (3), a cutting cone (5) axially arranged on the outer surface of the cone (1), and multiple threads (6) radially arranged on the cutting cone (5), each thread (6) having a coating (7) made of titanium. This utility model's wear-resistant tap with an internal groove has a chip groove at the top of the cone, which allows for timely chip removal during thread machining, preventing chip damage to the tap and extending its service life; the titanium coating on the threads increases the tap's wear resistance, protects the tap, and extends its service life.

[0004] The aforementioned tap chip groove lacks a guiding structure, causing chip debris from tapping to clog the chip groove. Furthermore, the existing taps have a single thread size, requiring the replacement of different sized taps when tapping harder pipe structures. Moreover, it is inconvenient to ensure that the tapped thread is centered on the pipe structure. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a carbon steel multi-stage tap structure with internal chip grooves, thus solving the problem.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a carbon steel multi-stage tap structure with a chip groove includes a transmission rod, a chip removal hole at the top of the transmission rod, a chip removal tube inside the transmission rod, and a tapping mechanism below the transmission rod.

[0007] A tap assembly, located at the bottom of the drive rod, is used to cut the inner wall of the pipe.

[0008] The chip removal assembly includes a rubber column fixedly installed inside the transmission rod, with a ball bearing movably installed below the fixed part of the rubber column. The chip removal assembly also includes a limiting rod movably installed below the transmission rod, with an auger fixedly installed on the outer side of the limiting rod.

[0009] Preferably, the tap assembly includes a multi-stage tap fixedly installed at the bottom end of the transmission rod, the multi-stage tap having a chip removal groove on its outer side, a chip receiving groove on its inner side, and a guide groove at its bottom end.

[0010] Preferably, the outer diameter of the multi-stage tap decreases gradually from top to bottom, the outer side of the multi-stage tap is provided with threads of different sizes, and the thread size decreases from top to bottom, and there are a total of four chip removal grooves.

[0011] Preferably, the chip removal groove is spiral-shaped and distributed in a cross shape with the axis of the multi-stage tap as the reference. The chip receiving groove is located at the center of the multi-stage tap, and the bottom end of the chip receiving groove is connected to the chip removal groove through a guide groove.

[0012] Preferably, the top end of the rubber column is fixedly connected to the transmission rod, a disc-shaped protrusion is provided on the outer side above the limiting rod, the limiting rod and the transmission rod are slidably connected, and the bottom end of the limiting rod is located below the bottom end of the multi-stage tap.

[0013] Preferably, the auger is segmented, with the uppermost auger extending downward from the inside of the chip removal pipe to the inside of the chip receiving groove. There are two balls, and the diameter of the balls is the same as the diameter of the limiting rod.

[0014] Beneficial effects

[0015] This invention provides a carbon steel multi-stage tap structure with an internal chip groove. Compared with the prior art, it has the following advantages:

[0016] (1) The carbon steel multi-stage tap structure with chip groove has a limiting rod. Since the bottom end of the limiting rod is located below the bottom of the multi-stage tap, the limiting rod will contact the bottom surface of the inner cavity of the workpiece during the tapping process and squeeze the rubber column upward. The disc-shaped protrusion at the top of the limiting rod can restrict the movement direction of the limiting rod and prevent the limiting rod from slipping. Metal chips will enter the chip groove during the cutting process. After the cutting is completed, the bottom end of the limiting rod can drive the auger outside the limiting rod to rotate to discharge the metal chips inside the chip groove.

[0017] (2) The carbon steel multi-stage tap structure with internal chip groove, through the setting of multi-stage tap, the thread size on the outer side of the multi-stage tap decreases step by step downward. When tapping high hardness pipes, the threads can be gradually cut inside the pipe through the threads on the outer side of the multi-stage tap. During the cutting process, since the thread center of the multi-stage tap is consistent, during the tapping process, since two sets of the three-stage threads always maintain engagement with the pipe, the thread is located at the center of the pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the connection structure between the transmission rod and the limiting rod of this utility model;

[0020] Figure 3 This is a schematic diagram of the installation structure of the limiting rod of this utility model;

[0021] Figure 4 This is a schematic diagram of the guide groove and chip groove structure of this utility model;

[0022] In the diagram: 1. Transmission rod; 11. Chip removal hole; 12. Chip removal tube; 2. Tapping mechanism; 21. Tap assembly; 211. Multi-stage tap; 212. Chip removal groove; 213. Chip receiving groove; 214. Guide groove; 22. Chip removal assembly; 221. Rubber column; 222. Ball bearing; 223. Limiting rod; 224. Screwdriver. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution: a carbon steel multi-stage tap structure with a chip groove, including a transmission rod 1, a chip removal hole 11 at the top of the transmission rod 1, and a chip removal pipe 12 inside the transmission rod 1.

[0025] Specifically, the top of the transmission rod 1 has a rectangular structure, which makes it easy for the processing equipment to clamp the tap, and the chip removal hole 11 makes it easy for the metal chips inside the chip removal tube 12 to be discharged.

[0026] A tapping mechanism 2 is installed below the transmission rod 1:

[0027] A tap assembly 21 is disposed at the bottom end of the transmission rod 1 and is used for cutting the inner wall of the pipe. The tap assembly 21 includes a multi-stage tap 211 fixedly installed at the bottom end of the transmission rod 1. The multi-stage tap 211 has a chip removal groove 212 on its outer side and a chip receiving groove 213 inside. The bottom end of the multi-stage tap 211 has a guide groove 214. The outer diameter of the multi-stage tap 211 decreases step by step from top to bottom. The outer side of the multi-stage tap 211 has threads of different sizes, and the thread size decreases from top to bottom. There are four chip removal grooves 212. The chip removal grooves 212 are spiral and distributed in a cross shape with the axis of the multi-stage tap 211 as the reference. The chip receiving groove 213 is located at the center of the multi-stage tap 211, and the bottom end of the chip receiving groove 213 is connected to the chip removal groove 212 through the guide groove 214.

[0028] Specifically, the thread size on the outer side of the multi-stage tap 211 decreases progressively downwards. When tapping high-hardness pipes, the threads on the outer side of the multi-stage tap 211 are used to gradually cut threads inside the pipe. During the cutting process, because the thread center of the multi-stage tap 211 is consistent, two sets of the three-stage threads always maintain engagement with the pipe during the tapping process, ensuring that the thread is located at the exact center of the pipe.

[0029] The chip removal assembly 22 includes a rubber column 221 fixedly installed inside the transmission rod 1. A ball bearing 222 is movably installed inside the rubber column 221. The chip removal assembly 22 also includes a limiting rod 223 movably installed below the transmission rod 1. An auger 224 is fixedly installed on the outer side of the limiting rod 223. The top of the rubber column 221 is fixedly connected to the transmission rod 1. A disc-shaped protrusion structure is provided on the outer side of the upper part of the limiting rod 223. The limiting rod 223 and the transmission rod 1 are slidably connected. The bottom end of the limiting rod 223 is located below the bottom end of the multi-stage tap 211. The auger 224 is segmented, and the uppermost auger 224 extends downward from the inside of the chip removal pipe 12 to the inside of the chip receiving groove 213. There are two balls 222, and the diameter of the balls 222 is the same as the diameter of the limiting rod 223.

[0030] Specifically, since the bottom end of the limiting rod 223 is located below the bottom of the multi-stage tap 211, during the tapping process, the limiting rod 223 will contact the bottom surface of the workpiece cavity and press the rubber column 221 upward. The disc-shaped protrusion at the top of the limiting rod 223 can restrict the movement direction of the limiting rod 223 and prevent the limiting rod 223 from slipping. Metal chips will enter the chip groove 213 during the cutting process. After the cutting is completed, the bottom end of the limiting rod 223 can drive the auger 224 on the outside of the limiting rod 223 to rotate to discharge the metal chips inside the chip groove 213. At the same time, the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0031] During operation, the limiting rod 223 will contact the bottom surface of the workpiece cavity during tapping and press the rubber column 221 upward. The disc-shaped protrusion at the top of the limiting rod 223 can restrict the movement direction of the limiting rod 223 and prevent the limiting rod 223 from slipping. Metal chips will enter the chip groove 213 during the cutting process. After the cutting is completed, the bottom end of the limiting rod 223 can drive the auger 224 on the outside of the limiting rod 223 to rotate and discharge the metal chips inside the chip groove 213. With the setting of the multi-stage tap, the thread size on the outside of the multi-stage tap 211 decreases step by step downward. When tapping high-hardness pipes, the threads can be gradually cut inside the pipe through the threads on the outside of the multi-stage tap 211. During the cutting process, since the thread center of the multi-stage tap 211 is consistent, during the tapping process, two sets of the three-stage threads always maintain engagement with the pipe to ensure that the thread is located in the center of the pipe.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-step carbon steel tap with chip flute structure comprising a driving stem (1), characterized in that: The top end of the transmission rod (1) is provided with a chip removal hole (11), the inside of the transmission rod (1) is provided with a chip removal pipe (12), and the lower part of the transmission rod (1) is provided with a tapping mechanism (2). A tap assembly (21) is arranged at the bottom end of the transmission rod (1) and is used for cutting the inner wall of the pipe; A chip removal assembly (22) comprises a rubber column (221) fixedly installed in the inside of the transmission rod (1), the inside of the rubber column (221) is fixedly installed with a ball (222) movably, the chip removal assembly (22) further comprises a limiting rod (223) movably installed below the transmission rod (1), and the outer side of the limiting rod (223) is fixedly installed with a auger (224).

2. The carbon steel multi-step tap with content fluting of claim 1, wherein: The tap assembly (21) comprises a multi-stage tap (211) fixedly installed at the bottom end of the transmission rod (1), the outer side of the multi-stage tap (211) is provided with a chip removal groove (212), the inside of the multi-stage tap (211) is provided with a chip pocket (213), and the bottom end of the multi-stage tap (211) is provided with a guide groove (214).

3. The carbon steel multi-step tap with content fluting of claim 2, wherein: The outer diameter of the multi-stage tap (211) gradually decreases from top to bottom, the outer side of the multi-stage tap (211) is provided with different sizes of threads, the size of the thread decreases from top to bottom, and the chip removal groove (212) has four chip removal grooves.

4. The carbon steel multi-step tap with content fluting of claim 3, wherein: The chip removal groove (212) is spiral-shaped and is distributed in a "cross” shape with the axis of the multi-stage tap (211) as the reference, the chip pocket (213) is located at the center of the multi-stage tap (211), and the bottom end of the chip pocket (213) is connected with the chip removal groove (212) through the guide groove (214).

5. The carbon steel multi-step tap with included flute of claim 1, wherein: The top end of the rubber column (221) is fixedly connected with the transmission rod (1), the outer side of the limiting rod (223) is provided with a disc-shaped protruding structure, the limiting rod (223) and the transmission rod (1) are in sliding connection, and the bottom end of the limiting rod (223) is located below the bottom end of the multi-stage tap (211).

6. The carbon steel multi-step tap with included flute of claim 1, wherein: The auger (224) is in a segmented form, the uppermost auger (224) extends from the inside of the chip removal pipe (12) to the inside of the chip pocket (213), the ball (222) has two balls, and the diameter of the ball (222) is consistent with the diameter of the limiting rod (223).

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