Oxygen-free copper hardware small hole drilling reamer

Abstract

The utility model provides an oxygen-free copper hardware small hole drilling reamer which is mainly composed of a cutter bar, and the cutter bar is divided into a cutting edge section and a cutter handle section. The cutting edge section is provided with the cutter tip end and the four cutting main edges spirally arranged in the axial direction of the cutter bar, the width of the cutting main edges is controlled to range from 0.1 mm to 0.2 mm, the contact area in the cutting process is effectively reduced, the adhesive force is reduced, and the cutter sticking phenomenon is reduced. The spiral arrangement of the cutting main edge enhances the shearing effect in the cutting process and promotes smooth separation and discharge of cuttings. The four cutting main blades are symmetrically arranged, and the included angle is controlled between 89.85 degrees and 90.15 degrees, so that chips are ensured to be subjected to uniform cutting force and shearing force, and the cutting chips are favorably broken and fragmented. Due to the design of the chip grooves, the chip discharging process is less blocked, chips can be smoothly and rapidly discharged out of the hole, accumulation and winding of the chips are avoided, and the chip breaking performance is improved. The drilling reamer is reasonable in design, and the machining efficiency and quality of the oxygen-free copper hardware small hole are effectively improved.

Description

Technical Field

[0001] This application relates to the field of drilling and reaming tools, and in particular to a small hole drilling and reaming tool for oxygen-free copper hardware. Background Technology Background Technology

[0003] Oxygen-free copper, a high-purity copper material with excellent electrical and thermal conductivity and good machinability, is widely used in many industrial fields. However, a series of technical challenges exist in the machining of small holes in oxygen-free copper hardware, especially when machining precision holes with a size of 3.7mm ± 0.01mm.

[0004] Oxygen-free copper has a relatively low hardness, which can easily lead to tool sticking during machining. When the tool comes into contact with oxygen-free copper, the stickiness of the material causes chips to adhere to the tool, affecting the continuity of the machining process and potentially causing rapid tool wear, thus shortening the tool's lifespan.

[0005] Meanwhile, oxygen-free copper is not easy to break chips during machining, which is a major problem when machining small holes. If the chips cannot be discharged in time and smoothly, they can easily accumulate in the hole, leading to machining defects such as scratches on the hole wall, excessively large hole diameter, or inaccurate shape. For precision holes with a size of 3.7mm ± 0.01mm, any tiny machining defect can seriously affect the performance and use of the product. Utility Model Content

[0006] The purpose of this application is to provide a small hole drilling and reaming tool for oxygen-free copper hardware that can effectively solve the problems of tool sticking, chip breakage, and high machining accuracy.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A small hole drill and reamer for oxygen-free copper hardware includes a tool shank, which comprises a cutting edge section and a tool holder section. The cutting edge section includes a tool tip and four main cutting edges spirally arranged along the axial direction of the tool shank. The width of each main cutting edge is 0.1 mm to 0.2 mm, and the included angle between two symmetrical main cutting edges is 89.85° to 90.15°. A chip removal groove is formed between two main cutting edges.

[0009] In one embodiment, the diameter of the cutting edge segment is larger than the diameter of the shank segment.

[0010] In one embodiment, the width of the spiral blade is 0.15 mm.

[0011] In one embodiment, the included angle between the two symmetrical cutting edges is 90°.

[0012] In one embodiment, the tool holder is made of tungsten steel.

[0013] The beneficial effects of this application are as follows:

[0014] (1) The cutting edge of the drill reamer in this application is reasonably designed, and the width of the main cutting edge is controlled between 0.1mm and 0.2mm, which reduces the contact area during the cutting process, reduces the adhesion between the cutting force and the oxygen-free copper material, and thus effectively reduces the occurrence of sticking.

[0015] The helical design of the cutting edge increases the shearing action during the cutting process, which facilitates the smooth separation and removal of chips, and further reduces the contact and adhesion between chips and the tool.

[0016] (2) The symmetrical arrangement of the four main cutting edges and the specific included angle design (89.85° to 90.15°) ensure that the chips generated during the cutting process are subjected to uniform cutting force and shearing force, which is beneficial to chip breakage and fragmentation.

[0017] The chip removal groove design reduces obstruction during chip removal, allowing chips to exit the hole smoothly and quickly, preventing chip accumulation and entanglement inside the hole, thus improving chip breaking performance. Attached Figure Description

[0018] Figure 1 This application provides a schematic diagram of the structure of a small hole drill reamer for oxygen-free copper hardware, as shown in one embodiment.

[0019] Figure 2 A partial structural schematic diagram of a small hole drill reamer for oxygen-free copper hardware provided in an embodiment of this application;

[0020] Explanation of reference numerals in the attached figures:

[0021] 100. Tool holder; 110. Cutting edge section; 120. Tool shank section;

[0022] 111. Tool tip; 112. Main cutting edge; 113. Chip groove; Detailed Implementation

[0023] The terminology used in the implementation section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. The implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] To address the technical problems of low hardness, easy tool sticking, and difficulty in chip breakage associated with oxygen-free copper during machining, this embodiment provides a drill-reamer specifically designed for machining small holes in oxygen-free copper hardware parts. The following is a detailed description of this embodiment:

[0025] Example 1

[0026] like Figures 1 to 2 As shown, a small hole drill and reamer for oxygen-free copper hardware has an overall structure including a shank 100, which is further divided into a cutting edge section 110 and a shank section 120.

[0027] Tool holder 100 structure:

[0028] The tool holder 100, as the main body of the drill reamer, is responsible for transmitting cutting force and supporting the cutting edge section 110.

[0029] The tool holder 100 is made of high-strength, high-wear-resistant material to ensure sufficient rigidity and stability during machining.

[0030] Cutting edge segment 110:

[0031] The cutting edge section 110 is located at the front end of the tool holder 100 and is the main part that performs the cutting function.

[0032] The cutting edge 110 includes a cutting tip 111, which is designed to be sharp and robust so as to quickly cut into the material at the start of cutting.

[0033] Four cutting edges 112 are spirally arranged along the axial direction of the tool holder 100. The width of these cutting edges 112 is controlled between 0.1 mm and 0.2 mm to ensure fine machining and reduce cutting forces during the cutting process.

[0034] The included angle α between the two symmetrical cutting edges 112 is designed to be between 89.85° and 90.15°. This angle range ensures the stability of cutting and facilitates the smooth removal of chips.

[0035] If the included angle α is less than 89.85°, the reduced angle causes the cutting force distribution on the main cutting edge 112 to become uneven. This uneven cutting force distribution increases tool wear and may even lead to uneven tool wear, thus affecting machining accuracy and surface quality.

[0036] If the included angle α is greater than 90.15°, the increased angle will reduce the stability of the cutting process. An excessively large included angle may cause the main cutting edge 112 to vibrate during the cutting process, affecting machining accuracy and surface quality.

[0037] Chip removal groove 113:

[0038] Chip removal grooves 113 are formed between every two adjacent cutting edges 112.

[0039] The chip removal groove 113 is designed to allow the chips generated during the cutting process to be discharged smoothly, reducing the accumulation and entanglement of chips in the hole, thereby improving the chip breaking performance.

[0040] Working principle:

[0041] When machining small holes in oxygen-free copper hardware using the drill reamer of this embodiment, the tip 111 first contacts and cuts into the oxygen-free copper material. As the tool holder 100 rotates and feeds, the main cutting edge 112 begins to perform the main cutting task. Due to the narrow width and reasonable included angle design of the main cutting edge 112, the contact area during the cutting process is reduced, which reduces the adhesion between the cutting force and the oxygen-free copper material, thereby effectively reducing the occurrence of tool sticking.

[0042] Meanwhile, the helical arrangement of the cutting edge 112 and the design of the chip removal groove 113 ensure that the chips are subjected to uniform cutting and shearing forces and smoothly discharged from the hole. This avoids chip accumulation and entanglement inside the hole, improves chip breaking performance, and increases machining efficiency.

[0043] In summary, the small hole drilling and reaming tool for oxygen-free copper hardware provided in this embodiment effectively solves the problems of tool sticking and chip breakage during oxygen-free copper machining through its unique design and innovative technical solution, while improving machining accuracy and efficiency. This drilling and reaming tool is suitable for high-precision and high-efficiency machining of small holes in oxygen-free copper hardware and has broad application prospects.

[0044] In this embodiment, the diameter D1 of the cutting edge section 110 is designed to be larger than the diameter D2 of the tool holder section 120, thus forming a clearance portion in the tool holder section 120. This design enhances the rigidity and stability of the cutting edge section 110, enabling it to better resist cutting forces and vibrations during machining, thereby improving machining accuracy. During machining, especially when the tool penetrates deep into the workpiece for cutting, interference can easily occur if the diameter of the cutting edge section 110 is too close to the diameter of the workpiece's inner hole or groove. Interference not only leads to a rough cutting surface but may also damage the tool and workpiece, causing machining failure. The existence of the clearance portion provides a certain gap between the tool and the workpiece, effectively avoiding this situation.

[0045] Along the axial direction of the tool holder 100, four main cutting edges 112 are spirally arranged on the cutting edge section 110. In this embodiment, the cutting edge width of these main cutting edges 112 is 0.15mm, which not only ensures the precision of cutting but also reduces friction and heat during the cutting process, thus helping to extend the tool life.

[0046] The included angle between the two symmetrical cutting edges 112 is designed to be 90°. This angle makes the cutting force distribution more uniform, which is conducive to the smooth removal of chips, while reducing tool wear and vibration.

[0047] In this embodiment, the tool holder 100 is made of tungsten steel. Tungsten steel has high hardness, high strength, and high wear resistance, and can withstand the high temperature and high pressure during the oxygen-free copper machining process, ensuring the stability and durability of the tool.

[0048] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0049] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0050] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “may include” and “have,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A small hole drill reamer for oxygen-free copper hardware, characterized in that: The tool includes a tool holder, which comprises a cutting edge section and a tool shank section. The cutting edge section includes a tool tip and four main cutting edges spirally arranged along the axial direction of the tool holder. The width of each main cutting edge is 0.1 mm to 0.2 mm, and the included angle between two symmetrical main cutting edges is 89.85° to 90.15°. A chip removal groove is formed between two main cutting edges.

2. The oxygen-free copper hardware small hole drill reamer according to claim 1, characterized in that: The diameter of the cutting edge section is larger than the diameter of the tool holder section.

3. The oxygen-free copper hardware small hole drill reamer according to claim 1, characterized in that: The width of the spiral blade is 0.15 mm.

4. The oxygen-free copper hardware small hole drill reamer according to claim 1, characterized in that: The included angle between the two symmetrical cutting edges is 90°.

5. The oxygen-free copper hardware small hole drill reamer according to claim 1, characterized in that: The tool holder is made of tungsten steel.

Images