A multi-purpose drill reamer tool

Abstract

The utility model discloses a multipurpose drill reamer tool belongs to machining tool design technical field, and this drill reamer tool is provided with two central symmetry's cutter tooth in the top of tool, and the top of cutter tooth is provided with outer blade and inner blade gradually from outside to inside, and the side of cutter tooth is provided with side blade, and the middle of two cutter teeth is provided with the chip flute, and the inside of cutter tooth is provided with cooling through -hole along the axial direction of tool, wherein: the rear end of outer blade is provided with gradually inclined outer blade first clearance angle and outer blade second clearance angle, and the rear end of inner blade is provided with gradually inclined inner blade first clearance angle and inner blade second clearance angle. Compared with prior art, the tool has excellent structural stability, can reduce vibration and deviation in the processing, and ensures the consistency and stability of processing quality. In addition, the cooling liquid channel and transition surface can significantly reduce the temperature in the processing, effectively solve the temperature rise problem caused by the difficulty of cooling liquid to reach the working area when the drilling depth is large.

Description

Technical Field

[0001] This utility model belongs to the field of machining tool design technology, and in particular relates to a multi-purpose drilling and reaming tool. Background Technology

[0002] Current machining processes generally employ a discrete operation mode using single-function tools. In multi-stage machining scenarios, operators must frequently perform repetitive operations such as tool disassembly and assembly, adjustment, and repeated workpiece clamping and positioning. This traditional operating method exposes a series of significant technical drawbacks:

[0003] First, the non-machining time loss caused by tool changing is a significant issue. Statistics show that tool changing accounts for approximately 15%-23% of the overall machining cycle in the processing of complex parts. Frequent tool changes not only reduce equipment utilization but also increase labor and tool wear costs, severely impacting the company's economic efficiency.

[0004] Secondly, cumulative positioning errors have an irreversible impact on machining accuracy. In traditional processes, the workpiece needs to undergo multiple clamping and positioning processes. The errors from "N-1" clamping operations (where N is the number of operations) will have a cumulative effect. Based on statistical process control (SPC) analysis, the cumulative positioning error after three clamping operations can reach ±0.05mm, which seriously exceeds the tolerance requirements for high-precision parts machining (usually ≤±0.02mm). This error propagation mechanism directly leads to a decrease in the finished product yield of about 12%-18%, resulting in serious material waste.

[0005] Furthermore, existing drill and reamer tools suffer from vibration and deviation during the machining of hard materials, and cannot solve the technical problem of temperature rise caused by the difficulty of coolant reaching the working area when drilling at greater depths. Therefore, how to improve existing drill and reamer tools to solve the above-mentioned technical problems has become a technical challenge in this field. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a multi-purpose drilling and reaming tool, which solves the problems through the following technical means:

[0007] A multi-purpose drilling and reaming tool has two centrally symmetrical cutting teeth at its top. From the outside inwards, the top of each tooth has an outer cutting edge and an inner cutting edge, and the sides of the teeth have side cutting edges. A chip removal groove is located between the two teeth, and cooling through holes are provided inside the teeth along the tool's axial direction. Specifically: the front end of the outer cutting edge is connected to the chip removal groove, and the rear end of the outer cutting edge has a progressively inclined first clearance angle and a second clearance angle; the inner cutting edge is also connected to the chip removal groove, and the rear end of the inner cutting edge has a progressively inclined first clearance angle and a second clearance angle.

[0008] Preferably, the end outlet of the cooling through hole is located at the second rear corner of the inner blade.

[0009] Preferably, the inner wall of the chip removal groove near the inner blade is provided with a chip removal arc surface, the top of the chip removal groove and the connection with the inner blade are provided with a transition slope, and the inner wall of the chip removal groove near the side blade is provided with a side blade slope.

[0010] Preferably, the tail of the blade is provided with a cylindrical handle.

[0011] Preferably, the first included angle between the outer edge and the inner edge ranges from 145° to 168°; the second included angle between the first rear angle of the outer edge and the horizontal plane ranges from 28° to 40°; and the third included angle between the first rear angle and the second rear angle of the outer edge ranges from 150° to 170°.

[0012] Preferably, the first included angle between the outer edge and the inner edge ranges from 150° to 155°; the second included angle between the first rear angle of the outer edge and the horizontal plane ranges from 30° to 38°; and the third included angle between the first rear angle and the second rear angle of the outer edge ranges from 155° to 165°.

[0013] The multi-purpose drilling and reaming tool of this utility model has the following beneficial effects:

[0014] 1) This drill-reamer is suitable for machining hard materials and features milling and chip removal functions, enabling it to smoothly drill existing pilot holes on workpieces. Furthermore, the side cutting edge further enhances the machining accuracy and surface finish of the hole wall, providing a strong guarantee for high-quality hole machining. For example, in the machining of stainless steel, multiple tool changes are unnecessary, and the machining can be completed in a single operation.

[0015] 2) This tool has excellent structural stability, which can reduce vibration and deviation during the machining process and ensure the consistency and stability of machining quality.

[0016] 3) The coolant channels and transition surfaces of this tool can significantly reduce the temperature during the machining process, effectively solving the problem of temperature rise caused by the difficulty of coolant reaching the working area when the drilling depth is large. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0019] Figure 2 This is a side view of the structure of this utility model;

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

[0021] Figure 4 This is a schematic diagram of the tooth end face structure of this utility model.

[0022] Among them, 1. Outer cutting edge; 101. First clearance angle of outer cutting edge; 102. Second clearance angle of outer cutting edge; 2. Inner cutting edge; 201. First clearance angle of inner cutting edge; 202. Second clearance angle of inner cutting edge; 3. Side cutting edge; 4. Chip removal groove; 401. Chip removal arc surface; 402. Transition slope; 403. Side cutting edge slope; 5. Cooling through hole; 6. Tool holder. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] The present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1 to 4 As shown, this multi-purpose drill and reamer has two centrally symmetrical cutting teeth at the top of the tool. The top of the cutting teeth has an outer cutting edge 1 and an inner cutting edge 2 arranged sequentially from the outside to the inside. The side of the cutting teeth has a side cutting edge 3. A chip removal groove 4 is arranged between the two cutting teeth. Cooling through holes 5 are arranged inside the cutting teeth along the tool axis. In the figure, the front end of the outer cutting edge 1 is connected to the chip removal groove 4. The rear end of the outer cutting edge 1 is arranged with a gradually inclined first clearance angle 101 and a second clearance angle 102. The inner cutting edge 2 is connected to the chip removal groove 4. The rear end of the inner cutting edge 2 is arranged with a gradually inclined first clearance angle 201 and a second clearance angle 202.

[0026] It should be noted that the overall shape of the cutting tool is cylindrical. On the end face of the cutting tool, there are two outer cutting edges 1 and two inner cutting edges 2. Behind the outer cutting edge 1 is the first clearance angle 101, and behind the first clearance angle 101 is the second clearance angle 102. Similarly, behind the inner cutting edge 2 is the first clearance angle 201, and behind the first clearance angle 201 is the second clearance angle 202. A cooling through-hole 5, which is circular, is located at the second clearance angle 102 of the outer cutting edge. Behind the second clearance angle 202 of the inner cutting edge is an arc-shaped transition surface. The edge of the transition surface and one side of the outer cutting edge 1 forms the side cutting edge 3 of the cutting tool. The side cutting edge is in a straight line and distributed along the transition surface. The other side of the transition surface is ground, and its diameter is smaller than the diameter of the cutting tool. Behind the transition surface is the transition shank, which has a diameter smaller than the cylindrical shape of the shank. Behind the transition shank is the shank itself.

[0027] The currently successfully tested tool holder diameter is φ12mm, the transition tool holder diameter is φ11mm, the effective drilling diameter is φ10.7mm, the tool length is 100mm, and the effective milling cutting edge length is 30mm. Grooving grinding has been performed on both ends of the tool, allowing for machining at both ends. Recommended machining parameters are: spindle speed 2500r / min, feed rate 200mm / min.

[0028] In this example, the end outlet of the cooling through-hole 5 is located on the second clearance angle 202 of the inner cutting edge. Specifically, the cooling through-hole 5 can significantly reduce the temperature during the machining process, effectively solving the problem of temperature rise caused by the difficulty of coolant reaching the working area when the drilling depth is large. Effective temperature control not only reduces machining friction but also avoids the adverse effects of high temperature on tool life. In addition, the cooling through-hole 5 can also promote the rapid discharge of drill chips from the drilling area, greatly reducing potential risks such as drill chip entanglement and drill bit jamming, ensuring smooth machining.

[0029] In this example, the chip removal groove 4 has a chip removal arc surface 401 on the inner wall near the inner cutting edge 2, a transition slope 402 at the connection between the top of the chip removal groove 4 and the inner cutting edge 2, and a side cutting edge slope 403 on the inner wall near the side cutting edge 3. Specifically, this tool combines milling and chip removal functions, enabling it to smoothly drill existing bottom holes on the workpiece. Particularly noteworthy is that the side cutting edge further improves the machining accuracy and surface finish of the hole wall, providing a strong guarantee for high-quality hole machining.

[0030] As shown in the diagram, the diameter of the tool holder 6 is larger than the effective drilling diameter of the tool, and there is a reasonable transition diameter. This structural design makes the tool more stable and reliable during drilling, effectively reducing vibration and deviation during the machining process, and ensuring the consistency and stability of machining quality.

[0031] Figure 4In this design, the first included angle 'a' between the outer edge 1 and the inner edge 2 ranges from 145° to 168°; the second included angle 'b' between the first back angle 101 of the outer edge and the horizontal plane ranges from 28° to 40°; and the third included angle 'c' between the first back angle 101 and the second back angle 102 of the outer edge ranges from 150° to 170°. Specifically, the first included angle 'a' between the outer edge 1 and the inner edge 2 ranges from 150° to 155°; the second included angle 'b' between the first back angle 101 of the outer edge and the horizontal plane ranges from 30° to 38°; and the third included angle 'c' between the first back angle 101 and the second back angle 102 of the outer edge ranges from 155° to 165°.

[0032] It should also be noted that this structure is suitable for machining on a five-axis CNC grinding machine. This advanced machining method allows for rapid tool re-sharpening, effectively shortening tool maintenance time. Furthermore, its machining cost is lower compared to traditional tools.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-purpose drilling and reaming tool, characterized in that, Two centrally symmetrical cutting teeth are provided at the top of the cutting tool. The top of the cutting teeth is provided with an outer cutting edge (1) and an inner cutting edge (2) from the outside to the inside. The side of the cutting teeth is provided with a side cutting edge (3). A chip removal groove (4) is provided between the two cutting teeth. Cooling through holes (5) are provided inside the cutting teeth along the cutting tool axis. The front end of the outer blade (1) is connected to the chip removal groove (4), and the rear end of the outer blade (1) is provided with a gradually inclined first rear angle (101) and a second rear angle (102). The inner blade (2) is connected to the chip removal groove (4), and the rear end of the inner blade (2) is provided with a gradually inclined first rear angle (201) and a second rear angle (202).

2. The multi-purpose drill and reamer according to claim 1, characterized in that, The end outlet of the cooling through hole (5) is located on the second rear corner (202) of the inner blade.

3. The multi-purpose drill and reamer according to claim 1, characterized in that, The chip removal groove (4) has a chip removal arc surface (401) on the inner wall near the inner blade (2), a transition slope (402) is provided at the connection between the top of the chip removal groove (4) and the inner blade (2), and a side blade slope (403) is provided on the inner wall near the side blade (3).

4. The multi-purpose drill and reamer according to claim 1, characterized in that, The tail of the blade is provided with a cylindrical handle (6).

5. The multi-purpose drill and reamer according to claim 1, characterized in that, The first included angle between the outer edge (1) and the inner edge (2) ranges from 145° to 168°; the second included angle between the first rear angle (101) of the outer edge and the horizontal plane ranges from 28° to 40°; the third included angle between the first rear angle (101) and the second rear angle (102) of the outer edge ranges from 150° to 170°.

6. The multi-purpose drill and reamer according to claim 1, characterized in that, The first included angle between the outer edge (1) and the inner edge (2) is between 150° and 155°; the second included angle between the first rear angle (101) of the outer edge and the horizontal plane is between 30° and 38°; the third included angle between the first rear angle (101) and the second rear angle (102) of the outer edge is between 155° and 165°.

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