Combined tool for drilling, stretching and tapping of sheet metal

Abstract

The utility model discloses a kind of composite cutters for sheet drilling, drawing and tapping, belong to the technical field of machining tool, including sequentially connected for the drilling of sheet drilling hole portion, for the extrusion of hole and peripheral material to make it occur plastic deformation and form the extrusion drawing portion of protruding tubular structure on one side of hole, for tapping hole inner wall and tapping portion, and for clamping centering tool holder. The composite cutter of the utility model is suitable for the thread processing of thin metal plate, after drilling, extrusion drawing processing is carried out, the hole and the peripheral material are extruded to occur plastic deformation and increase the hole wall depth size, the extruded part is located on one side of sheet, the length of hole is extended, and after tapping processing, the purpose of increasing the length of threaded hole can be achieved, and the thread connection reliability of threaded hole is improved.

Description

Technical Field

[0001] This utility model belongs to the field of machining tool technology, specifically relating to a composite tool for drilling, stretching and tapping thin plates. Background Technology

[0002] In existing technologies, when machining threaded holes in metal sheets, composite tools integrating drill bits and taps are typically used to improve machining efficiency and accuracy. These tools allow for immediate tapping after drilling without the need to change tools, making operation simple and convenient. However, for thin metal sheets (e.g., less than 1 mm thick), the thickness is less than the conventional thread pitch, resulting in incomplete thread profiles and affecting the reliability of the threaded connection. Therefore, existing composite tools are insufficient to meet the machining requirements of threaded holes in thin sheets. Based on this, this application proposes a composite tool for drilling, drawing, and tapping thin sheets. Utility Model Content

[0003] This utility model addresses the shortcomings of the prior art by providing a composite tool for drilling, stretching, and tapping thin plates. It integrates drilling, stretching, and tapping functions into one unit. After drilling, it can perform extrusion and stretching treatment, causing the hole and surrounding material to undergo plastic deformation under extrusion and forming a raised cylindrical structure on one side of the hole. Finally, after tapping, a threaded hole with extended length can be obtained, improving the reliability of the threaded connection.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A composite tool for drilling, stretching, and tapping thin plates is characterized by comprising, in sequence, a drilling section for drilling holes in thin plates, a stretching section for extruding and plastically deforming the hole and surrounding material to form a protruding cylindrical structure on one side of the hole, a tapping section for tapping threads into the inner wall of the hole, and a tool holder for clamping and centering.

[0005] Preferably, the drilling section, the extrusion and stretching section, the tapping section, and the tool holder are an integral structure.

[0006] Preferably, the extrusion and stretching section includes a tapered extrusion head and a stretching rod, and the drilling section, tapered extrusion head, stretching rod, and tapping section are connected in sequence.

[0007] Preferably, the conical extrusion head has a frustum-shaped structure, and its outer diameter gradually increases from the drilled part towards the tension rod.

[0008] Preferably, the taper of the conical extrusion head is 60°.

[0009] Preferably, the tapping part adopts a straight flute tap structure.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The composite tool of this utility model is suitable for thread processing of thin metal plates. After drilling, it is subjected to extrusion and stretching treatment. The hole and surrounding material are subjected to extrusion and plastic deformation, forming a raised cylindrical structure on one side of the hole (the back of the thin plate), which extends the length of the hole. Then, by tapping, the length of the threaded hole can be increased, thus improving the reliability of the threaded connection of the threaded hole. (2) The design of the composite tool of this utility model realizes the efficient integration of thread processing of thin plates with small diameter holes, which effectively improves production efficiency and processing quality. It can be used for thread processing of thin plates with a size of less than 1mm and within ￠5mm. (3) This utility model integrates drilling, extrusion stretching and tapping functions, avoiding the trouble of frequent tool changes in traditional processing technology. Compared with traditional technology, it can reduce tool change time by 70%, and the thread perpendicularity error is controlled within 0.02mm. Attached Figure Description

[0011] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Enlarged structural diagram of section A in the middle; Figure 3 This is a schematic diagram of the usage state of this utility model; In the figure: 1. Drilling section, 2. Extrusion and stretching section, 201. Conical extrusion head, 202. Stretching rod, 3. Tapping section, 301. Tapping cutting section, 302. Thread calibration section, 4. Tool holder, 5. Workpiece, 6. Stretching anvil. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] In the description of this utility model, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] like Figure 1 and Figure 2 As shown, a composite tool for drilling, stretching, and tapping thin plates includes a drilling section 1 for cutting and drilling thin plates, a stretching section 2 for extruding and plastically deforming the hole and surrounding material to form a protruding cylindrical structure on one side of the hole (the back of the thin plate), a tapping section 3 for tapping threads into the inner wall of the hole, and a tool holder 4 for clamping and centering. The drilling section, stretching section, tapping section, and tool holder are integrated into one piece. The stretching section includes a conical extrusion head 201 and a stretching rod 202. The drilling section, conical extrusion head, stretching rod, and tapping section are connected in sequence. The conical extrusion head has a frustum-shaped structure, and its outer diameter gradually increases from the drilling section to the stretching rod to achieve a smooth transition between the drilling section and the stretching rod. The taper of the conical extrusion head is 60°, and the surface is polished to Ra0.2. The tapping section adopts a straight flute tap structure, including a tapping cutting section 301 and a thread calibration section 302 (existing conventional tap structures, which will not be described in detail here).

[0017] like Figure 3 As shown, this composite tool can be used on cutting machine tools such as drilling machines and tapping machines. The tool holder is clamped in a drill chuck or other tapping fixture. The thin metal sheet workpiece to be machined is mounted above a stretching anvil, which is fixed to the machine tool's worktable. The stretching hole of the stretching anvil should be coaxial with the machine tool spindle, meaning the stretching hole and the threaded hole to be machined on the workpiece are located on the same central axis. The specific processing steps are as follows: (1) Clamping: Adjust the workpiece positioning and clamping to ensure accurate machining position (existing technology, which will not be described in detail here); (2) Drilling: Drive the composite tool to cut and drill holes at the specified positions of the metal sheet. The specific process parameters are: drilling ￠3.13 mm, spindle speed adjusted to 1500 r / min-1800 r / min, feed rate 0.2 mm / r; (3) Extrusion and stretching: As the spindle feed increases, the tapered extrusion head extrudes the hole, and the hole and surrounding material are subjected to extrusion and undergo plastic deformation, forming a raised cylindrical structure on the lower side of the hole (the lower side of the thin plate), thereby increasing the hole depth and facilitating the reliability of the thread fastening of the workpiece. The specific process parameters are: extrusion and stretching hole ￠4.2 mm, hole depth 2 mm; spindle speed adjusted to 40 r / min-60 r / min, feed rate 0.3 mm / r; (4) Tapping: The tapping part taps the inner wall of the hole (thin plate part + extrusion part) to make threads. The specific process parameters are: M5x0.8, spindle speed is adjusted to 40r / min-60r / min, feed rate is 0.8mm / r; (5) Retract the tool: After tapping, retract the tool to complete the thread hole machining of the thin plate.

[0018] The composite tool of this utility model is suitable for thread processing of thin metal plates. The conical extrusion head 201 and the tension rod 202 of the extrusion and tensioning part 2 extrude and stretch the hole formed after drilling in sequence. The hole and the surrounding material are plastically deformed by extrusion, and a raised cylindrical structure is formed on the lower side of the hole, which extends the length of the hole. Finally, the tapping part 3 is used for tapping, which ultimately achieves the purpose of increasing the length of the threaded hole and improving the reliability of the threaded connection.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

Claims

1. A composite tool for drilling, drawing, and tapping thin plates, characterized in that: It includes a drilling section for drilling holes in thin plates, a compression and stretching section for extruding the hole and surrounding material to cause plastic deformation and form a protruding cylindrical structure on one side of the hole, a tapping section for tapping threads on the inner wall of the hole, and a tool holder for clamping and centering.

2. The composite tool for drilling, stretching, and tapping thin plates as described in claim 1, characterized in that: The drilling section, extrusion and stretching section, tapping section, and tool holder are an integral structure.

3. The composite tool for drilling, stretching, and tapping thin plates as described in claim 1, characterized in that: The extrusion and stretching section includes a tapered extrusion head and a stretching rod, and the drilling section, tapered extrusion head, stretching rod, and tapping section are connected in sequence.

4. The composite tool for drilling, stretching, and tapping thin plates as described in claim 3, characterized in that: The conical extrusion head has a frustum-shaped structure, and its outer diameter gradually increases from the drilled part towards the tension rod.

5. The composite tool for drilling, stretching, and tapping thin plates as described in claim 4, characterized in that: The tapered extrusion head has a taper of 60°.

6. The composite tool for drilling, stretching, and tapping thin plates as described in claim 1, characterized in that: The tapping section adopts a straight flute tap structure.

Images