Self-tapping screw without forming scraps

Abstract

The utility model relates to the technical field of self-tapping screws, and discloses a self-tapping screw without forming scraps, which comprises a screw body, the screw body comprises a screw end, a rod body, a first thread, a second thread, a smooth transition section and a flat drilling head, and the rod body is fixedly connected to the center of the lower surface of the bottom end of the threaded end. The surface of the upper end of the rod body is provided with a first thread, the lower end of the rod body is provided with a second thread, the bottom end of the first thread is fixedly connected with the top end of the second thread, the bottom end of the rod body is fixedly connected with a smooth transition section, and the bottom end of the smooth transition section is fixedly connected with a flat drilling head. When materials are tapped in, cuttings can be reduced, cleanliness is kept, meanwhile, the installation efficiency is improved, the device is suitable for the processing field of precision equipment, electronic appliances and food equipment, the attractive effect can be achieved when the device is used through cooperation of the disassembly and assembly head and the decorative cover, use is flexible, use limitation is reduced, and the practical effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of self-tapping screws, in particular to a self-tapping screw without formed chips. Background Art

[0002] Self-tapping screws are a type of mechanical connector with a special thread that can automatically tap out internal threads when screwed in to achieve tightening. The head shape is diverse, with sharp threads, dense pitch, and a smooth root top. The diameter and length of the shank depend on the usage scenario and material. It is made of carbon steel, stainless steel, aluminum alloy and other materials and has good mechanical properties. When working, it forms an internal thread by rotating and cutting into the material. It is widely used in industries such as construction, electronics and electrical appliances, automobile manufacturing, and furniture manufacturing, such as connecting wooden structures and light steel keels in buildings, fixing electrical components, installing automobile bodies and interiors, and connecting furniture panels.

[0003] Existing self-tapping screws are usually provided with a pointed head to facilitate driving into objects, resulting in the automatic screws generating a large amount of chips when driving. In some environments with high cleanliness requirements, such as assembly workshops for electronic and electrical equipment or manufacturing scenarios for precision instruments, chips may remain inside the equipment, affecting the normal operation of electronic components, increasing the risk of short circuits, or interfering with the accuracy of precision instruments. In special fields such as food processing equipment or medical equipment, the residual chips may cause health hazards and fail to meet strict hygiene standards. The generation of a large amount of chips will also increase the cost and time of subsequent cleaning work and reduce production efficiency. For this reason, we propose a chip-free self-tapping screw. Utility Model Content

[0004] The main purpose of the utility model is to provide a self-tapping screw without forming chips, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a self-tapping screw without formed chips, comprising a screw body, the screw body comprising a screw end, a rod body, a first thread, a second thread, a smooth transition section and a flat drilling head, the rod body is fixedly connected at the center position of the lower surface of the bottom end of the screw end, the upper end surface of the rod body is provided with a first thread, the lower end of the rod body is provided with a second thread, and the bottom end of the first thread and the top end of the second thread are fixedly connected, the bottom end of the rod body is fixedly connected to the smooth transition section, and the bottom end of the smooth transition section is fixedly connected to the flat drilling head.

[0006] Preferably, the screw end includes a disassembly head and a decorative cover, the disassembly head is provided with clamping holes at both ends of the upper surface, and the decorative cover has elastic buckles fixedly connected to the clamping holes at both sides of the lower surface and at positions corresponding to the clamping holes.

[0007] Preferably, button holes are provided on both sides of the lower surface of the decorative cover.

[0008] Preferably, a disassembly hole is provided at the center of the upper surface of the disassembly head, a cross slot is provided on the upper surface of the disassembly hole, and a hexagonal screw head is fixedly connected to the bottom end of the inner cavity of the disassembly hole.

[0009] Preferably, the first thread is located at the upper end of the second thread, and the pitch of the first thread is smaller than the pitch of the second thread, and the pitch of the thread on the surface of the rod body is gradually changed from the head to the tail.

[0010] Preferably, the screw body is made of high-strength aluminum alloy, and the surface of the screw body is coated with a diamond-like coating.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The utility model cooperates with a rod body, a first thread, a second thread, a smooth transition section and a flat drilling head. The first thread on the rod body is located at the upper end and has a smaller pitch than the second thread. At the same time, the thread pitch on the surface of the rod body is gradually changed from the head to the tail. In the initial stage of insertion, the larger pitch and shallower thread depth enable the screw to cut into the material more easily. At this time, the deformation of the material is relatively small and it is not easy to generate chips. As the screw goes deeper, the pitch gradually becomes smaller, the thread depth gradually increases, and the squeezing effect of the thread on the material gradually increases, so that the material is more tightly filled between the threads, further reducing the formation of chips. In the initial insertion process, the cooperation between the smooth transition section and the flat drilling head further optimizes the drilling and insertion process. The smooth thread profile can make the material flow more smoothly, reduce the material breakage and chip generation caused by stress concentration, reduce the possibility of chip generation, ensure the cleanliness of the installation environment, and also improve the installation efficiency. It is particularly suitable for fields such as precision equipment assembly or electronic and electrical product manufacturing with high requirements on cleanliness.

[0013] 2. The utility model cooperates with the disassembly head and the decorative cover, and the clamping holes at both ends of the upper surface of the disassembly head cooperate with the elastic buckles on the lower surface of the decorative cover, so that the decorative cover is firmly installed, achieving a decorative effect while also being easy to disassemble and protecting the internal structure. In addition, the disassembly hole on the disassembly head has both a cross slot and a hexagonal screw head design, which can adapt to different disassembly and assembly tools, greatly improving the flexibility of use, reducing the limitations of screw use, and effectively improving the practical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the split end of the utility model;

[0016] Figure 3It is a schematic diagram of the planar structure of the disassembly and assembly head of the utility model.

[0017] In the figure: 1. Screw body; 2. Screw end; 3. Rod; 4. First thread; 5. Second thread; 6. Smooth transition section; 7. Flat drilling head; 21. Disassembly head; 22. Decorative cover; 23. Elastic buckle; 24. Buckle hole; 25. Disassembly hole; 26. Cross slot; 27. Clamp hole; 28. Hexagonal screw head. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example

[0020] See also Figure 1 - Figure 3 , a self-tapping screw without forming chips shown in the figure includes a screw body 1, the screw body 1 includes a screw end 2, a rod body 3, a first thread 4, a second thread 5, a smooth transition section 6 and a flat drilling head 7, the rod body 3 is fixedly connected to the center position of the lower surface of the bottom end of the screw end, the upper end surface of the rod body 3 is provided with a first thread 4, the lower end of the rod body 3 is provided with a second thread 5, and the bottom end of the first thread 4 and the top end of the second thread 5 are fixedly connected, the bottom end of the rod body 3 is fixedly connected to a smooth transition section 6, and the bottom end of the smooth transition section 6 is fixedly connected to a flat drilling head 7; larger pitch and smaller The shallow thread depth allows the screw to cut into the material more easily. At this time, the deformation of the material is relatively small and it is not easy to produce chips. As the screw goes deeper, the pitch gradually becomes smaller, the thread depth gradually increases, and the squeezing effect of the thread on the material gradually increases, so that the material is more tightly filled between the threads, further reducing the formation of chips. In the initial entry process, the cooperation of the smooth transition section 6 and the flat drilling head 7 further optimizes the drilling and tapping process. The smooth thread profile can make the material flow more smoothly, reduce material breakage and chip generation caused by stress concentration, and reduce the possibility of chip generation.

[0021] Among them, the screw end 2 includes a disassembly head 21 and a decorative cover 22, and the disassembly head 21 has clamping holes 27 at both ends of the upper surface, and the decorative cover 22 has elastic clamps 23 fixedly connected to the clamping holes 27 on both sides of the lower surface and at positions corresponding to the clamping holes 27. Buckle holes 24 are provided on both sides of the lower surface of the decorative cover 22; through the cooperation between the elastic clamps 23 and the clamping holes 27, the decorative cover 22 is conveniently installed and firmly fixed, which can not only achieve decorative effects and protect the internal structure, but also can be conveniently removed for maintenance or other operations when needed.

[0022] Among them, a disassembly hole 25 is opened at the center position of the upper surface of the disassembly head 21, and a cross slot 26 is opened on the upper surface of the disassembly hole 25. The bottom end of the inner cavity of the disassembly hole 25 is fixedly connected with a hexagonal screw head 28; the cross slot 26 facilitates the use of an ordinary screwdriver for quick installation and disassembly, and the hexagonal screw head 28 provides an alternative operation method when greater torque or special installation conditions are required, thereby improving the applicability of the screw in different usage scenarios.

[0023] Among them, the first thread 4 is located at the upper end of the second thread 5, and the pitch of the first thread 4 is smaller than the pitch of the second thread 5, and the pitch of the thread on the surface of the rod body 3 is gradually changed from the head to the tail; in the early stage of screwing in, the second thread 5 with a larger pitch can cut into the material more accurately, so that the material is moderately deformed under the extrusion of the thread; as the screwing deepens, the first thread 4 with a smaller pitch can better squeeze the material to both sides, thereby realizing orderly filling of the material between the threads, reducing chip generation, and improving installation quality and efficiency.

[0024] Among them, the screw body 1 is made of high-strength aluminum alloy, and the surface of the screw body 1 is coated with a diamond-like coating; by using high-strength aluminum alloy, the screw is given a lighter weight and higher strength, and can withstand greater tension and pressure, meeting the connection requirements under various usage environments. The presence of the diamond-like coating greatly reduces the friction coefficient between the screw and the material, reduces wear, enhances wear resistance and corrosion resistance, further extends the service life of the screw, and ensures long-term stable connection performance.

[0025] It should be noted that the present invention is a self-tapping screw without forming chips. The flat drilling head 7 is aligned with the predetermined installation point on the surface of the material to be fixed. A suitable tool (such as an electric screwdriver or a manual screwdriver) is used to apply torque through the cross slot 26 or the hexagonal screw head 28 to start the screw body 1 to rotate. During the rotation, the material is moderately deformed under the extrusion of the thread instead of being cut. As the screw body 1 goes deeper, the first thread 4 gradually guides the second thread 5 into the material. Since the pitch of the second thread 5 is smaller, it can more effectively The material is squeezed to both sides. At the same time, the gradual pitch design allows the material to be filled in an orderly manner between the threads, avoiding the generation of chips. The smooth transition section 6 ensures a smooth transition from the thread to the drilling head part, reduces stress concentration, makes the penetration process smoother and effectively reduces the generation of chips. Continue to rotate the screw until the required tightening degree is reached. Finally, the decorative cover 22 is snapped into the snap hole 27 on the disassembly head 21 through the elastic snap buckle 23, so as to fix the device cover on the surface of the disassembly head 21, thereby achieving a decorative effect and improving the aesthetics after the screw is driven in.

[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0027] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A chipless self-tapping screw, comprising a screw body (1), characterized in that: The screw body (1) comprises a screw end (2), a rod body (3), a first thread (4), a second thread (5), a smooth transition section (6) and a flat drilling head (7); the rod body (3) is fixedly connected to the center position of the lower surface of the bottom end of the screw end; the first thread (4) is provided on the upper surface of the rod body (3); the second thread (5) is provided at the lower end of the rod body (3); the bottom end of the first thread (4) and the top end of the second thread (5) are fixedly connected; the bottom end of the rod body (3) is fixedly connected to the smooth transition section (6); and the bottom end of the smooth transition section (6) is fixedly connected to the flat drilling head (7).

2. The chipless self-tapping screw according to claim 1, characterized in that: The screw end (2) comprises a disassembly head (21) and a decorative cover (22); clamping holes (27) are provided at both ends of the upper surface of the disassembly head (21); and elastic buckles (23) adapted to the clamping holes (27) are fixedly connected at both sides of the lower surface of the decorative cover (22) at positions corresponding to the clamping holes (27).

3. The chipless self-tapping screw according to claim 2, characterized in that: Buckle holes (24) are provided on both sides of the lower surface of the decorative cover (22).

4. The chipless self-tapping screw according to claim 2, characterized in that: A disassembly hole (25) is provided at the center of the upper surface of the disassembly head (21), a cross slot (26) is provided on the upper surface of the disassembly hole (25), and a hexagonal screw head (28) is fixedly connected to the bottom end of the inner cavity of the disassembly hole (25).

5. The chipless self-tapping screw according to claim 1, characterized in that: The first thread (4) is located at the upper end of the second thread (5), and the pitch of the first thread (4) is smaller than the pitch of the second thread (5). The thread pitch on the surface of the rod body (3) is designed to be gradually changed from the head to the tail.

6. The chipless self-tapping screw according to claim 1, characterized in that: The screw body (1) is made of high-strength aluminum alloy, and the surface of the screw body (1) is coated with a diamond-like coating.

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