A crank tap with helical flutes

Abstract

The utility model discloses a crank tap with spiral groove, including cutting edge part, guide rod part and crank part, the cutting edge part includes tip, pilot end and tap end, the outside wall of tap end is provided with the tap tooth for the thread of shaped product inner hole, still be equipped with 3 chip flutes on the cutting edge part, the chip flutes are arranged spirally, the outside wall of cutting edge part is provided with 3 blade edges, the blade edge is arranged along the spiral direction of chip flute. The utility model can solve the problem of the existing straight flute tap when processing the special nut with 3 through notches, because the straight flute chip removal path conflicts with the nut notch position, the iron filings will be left in the inner hole, cannot be discharged directly from the tap groove, influence nut precision.

Description

Technical Field

[0001] This utility model relates to the technical field of tap structures for nut manufacturing, specifically a crank tap with a spiral groove. Background Technology

[0002] In fully automated nut production equipment, crank taps are used to machine the threads inside the nuts. As a core tool for thread machining, the crank tap holds a crucial position in the mechanical manufacturing field. There is a special type of nut, as shown in the attached diagram, with three through-holes spaced circumferentially along the edge of the nut's central bore. When machining this special nut with three through-holes at the edge of the central bore, existing crank taps mostly employ a straight flute chip removal design. However, the straight flute chip removal path conflicts with the position of the nut's notches, preventing chips from being smoothly discharged through the straight flute. A large amount of chips remain in the bore and notches, not only scratching the machined thread surface and causing precision defects, but also subjecting the tap to additional loads due to chip compression, potentially leading to edge chipping or tap breakage. Therefore, a new type of crank tap specifically designed to adapt to fully automated production equipment is needed. Utility Model Content

[0003] This invention provides a crank tap with spiral grooves, which can solve the problem that when existing straight groove taps are used to process special nuts with three through notches in the bottom hole, the chip removal path of the straight groove conflicts with the position of the notches in the nut, and the chips remain in the inner hole and cannot be directly discharged from the tap groove, thus affecting the accuracy of the nut.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a crank tap with spiral grooves, comprising a cutting edge, a guide rod, and a crank. The cutting edge includes a tip, a guide end, and a tap end. The outer wall of the tap end is provided with tap teeth for forming internal threads of the product. The cutting edge also has three chip removal grooves arranged in a spiral shape. The outer wall of the cutting edge has three cutting edges arranged along the spiral direction of the chip removal grooves. When machining nuts with special internal hole shapes, the cutting edge located at the top of the spiral chip removal grooves can cut the iron chips generated by cutting more finely, making them easier to discharge along the tap grooves, thus improving the machining accuracy of special nuts. The spiral groove design allows iron chips to be discharged along the spiral path, reducing iron chip scratches and cutting deviations, ensuring the surface quality and dimensional accuracy of the thread. It can be directly installed on a fully automatic nut tapping machine, improving the continuity and efficiency of special nut machining.

[0005] As a supplement to the technical solution described in this utility model, the crank part, guide rod part and cutting edge part are integrally formed, which enhances the overall structural strength and stability of the tap, enables it to withstand greater cutting forces, and reduces the risk of breakage during use.

[0006] As a supplement to the technical solution described in this utility model, the included angle between the cutting edge and the axis of the guide rod is 5°-15°. The included angle makes the contact between the cutting edge and the workpiece material more reasonable during the cutting process, reduces the resistance of the feed, makes the teeth less prone to chipping, and makes the cutting force distribution more uniform.

[0007] As a supplement to the technical solution described in this utility model, a guide thread is provided on the outer wall of the guide portion. The end of the guide thread near the tap end is connected to the end of the tap thread on the tap end. The guide thread at the guide end contacts the hole wall in the early stage when the tap enters the inner hole of the workpiece. Its pitch and thread profile match the tap thread of the subsequent tap end, which can provide precise guidance for the travel direction of the tap and initially form the internal thread of the product.

[0008] As a supplement to the technical solution described in this utility model, a TiCN coating is provided on the surface of the tap end. The TiCN coating has extremely high hardness and excellent wear resistance, and its coefficient of friction is low. The TiCN coating also has good oxidation resistance and corrosion resistance, and can resist the high temperature generated during the cutting process and the corrosion of media such as coolant.

[0009] As a supplement to the technical solution described in this utility model, one end of the chip removal groove extends to the tip, and the other end of the chip removal groove extends to the outer wall of the guide rod. The chip removal groove forms a complete chip removal channel from the cutting source to the guide rod, effectively avoiding the occurrence of chip blockage.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The helical flutes of a crank tap are curved relative to the axis (right-hand or left-hand helix). The cutting edge at the top of the flutes, when machining nuts with specially shaped inner holes, cuts the generated chips finer, making them easier to remove along the tap flutes. This effectively avoids the problem of chips remaining in the inner hole that occurs with ordinary taps, ensuring the machining accuracy of the nut. The integrated structure enhances the overall rigidity and strength of the tap, better withstanding the cutting forces during tapping, reducing the risk of tap damage, and extending its service life. It solves the problem of existing straight-flute taps causing chips to remain in the inner hole when machining special nuts with three through-hole notches in the bottom hole, as the chip removal path of the straight flute conflicts with the position of the nut notches, affecting the nut's accuracy. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3This is a schematic diagram of the blade portion of this utility model.

[0015] Figure label:

[0016] 1. Cutting edge, 2. Guide rod, 3. Crank, 4. Tip, 5. Tap end, 6. Tap tooth, 7. Chip groove, 8. Cutting edge, 9. Guide end, 10. Guide thread. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] The embodiments of this utility model relate to a crank tap with a spiral groove, such as... Figure 1-3 As shown, it includes a cutting edge 1, a guide rod 2, and a crank 3. The cutting edge 1 includes a tip 4, a guide end 9, and a tap end 5. The outer wall of the tap end 5 is provided with tap teeth 6 for forming the internal thread of the product. The cutting edge 1 is also provided with three chip removal grooves 7, which are arranged in a spiral shape. The outer wall of the cutting edge 1 is provided with three cutting edges 8, which are arranged along the spiral direction of the chip removal grooves 7. When machining nuts with special internal hole shapes, the cutting edges 8 located at the top of the spiral chip removal grooves 7 can cut the iron chips generated by cutting more finely, making them easier to be discharged along the tap grooves, thus improving the machining accuracy of special nuts. The spiral groove design allows iron chips to be discharged along the spiral path, reducing iron chip scratches and cutting deviations, ensuring the surface quality and dimensional accuracy of the thread, and can be directly installed on a fully automatic nut tapping machine to improve the continuity and efficiency of special nut machining.

[0019] In this embodiment, as Figure 1 As shown, the crank portion 3, guide rod portion 2, and cutting edge portion 1 are integrally formed, which enhances the overall structural strength and stability of the tap, enabling it to withstand greater cutting forces and reducing the risk of breakage during use.

[0020] In this embodiment, as Figure 2 As shown, the angle between the cutting edge (8) and the axis of the guide rod (2) is 5°-15°. The angle makes the contact between the cutting edge (8) and the workpiece material more reasonable during the cutting process, reduces the resistance of the feed, makes the teeth less prone to chipping, and makes the cutting force distribution more uniform.

[0021] In this embodiment, as Figure 1 and Figure 3As shown, a guide thread 10 is provided on the outer wall of the guide part 9. The end of the guide thread 10 near the tap end 5 is connected to the end of the tap thread 6 on the tap end 5. The guide thread 10 of the guide end 9 contacts the hole wall in the early stage when the tap enters the inner hole of the workpiece. Its pitch and thread profile match the tap thread 6 of the subsequent tap end 5, which can provide precise guidance for the travel direction of the tap and initially form the internal thread of the product.

[0022] In this embodiment, as Figure 1 As shown, a TiCN coating is provided on the surface of the tap end 5. The TiCN coating has extremely high hardness and excellent wear resistance, and its coefficient of friction is low. The TiCN coating also has good oxidation resistance and corrosion resistance, and can resist the high temperature generated during the cutting process and the corrosion of media such as coolant.

[0023] In this embodiment, as Figure 1 As shown, one end of the chip removal groove 7 extends to the tip 4, and the other end of the chip removal groove 7 extends to the outer wall of the guide rod part 2. The chip removal groove 7 forms a complete chip removal channel from the cutting source to the guide rod part, effectively avoiding the occurrence of chip clogging.

[0024] In this embodiment, as Figure 1 As shown, when machining a special nut with three through notches in the bottom hole, the entire crank tap is installed in a fully automatic nut tapping machine. In the initial stage of machining, the tip 4 is aligned with the center bottom hole of the nut and inserted. The guide thread 10 of the guide part 9 first contacts the hole wall, and the cutting edge 8 begins to cut the workpiece. The guide part 9 is precisely guided along the preset path to initially form the internal thread profile. The tap thread 6 of the tap end 5 begins to machine the complete thread. The cutting edge 8 is located at the top of the spiral chip removal groove 7. During machining, the cutting edge 8 cuts off the chips and puts them into the chip removal groove 7. The chips are discharged along the spiral chip removal groove 7.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A crank tap with a spiral groove, characterized in that, include: The blade part (1), the guide rod part (2), and the crank part (3); The cutting edge (1) includes a tip (4), a guide end (9) and a tap end (5). The outer wall of the tap end (5) is provided with tap teeth (6) for forming the internal thread of the product. The cutting edge (1) is also provided with three chip removal grooves (7) arranged in a spiral shape. The outer wall of the cutting edge (1) is provided with three cutting edges (8) arranged along the spiral direction of the chip removal grooves (7).

2. The crank tap with helical groove according to claim 1, characterized in that: The crank part (3), guide rod part (2) and blade part (1) are integrally formed.

3. The crank tap with helical groove according to claim 1, characterized in that: The angle between the cutting edge (8) and the axis of the guide rod (2) is 5°-15°.

4. The crank tap with helical groove according to claim 1, characterized in that: The outer side wall of the guide portion (9) is provided with guide threads (10).

5. The crank tap with helical groove according to claim 1, characterized in that: A TiCN coating is provided on the surface of the tap end (5).

6. The crank tap with helical groove according to claim 1, characterized in that: One end of the chip removal groove (7) extends to the tip (4), and the other end of the chip removal groove (7) extends to the outer wall of the guide rod (2).

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