Machine reamer with helical cutting edge

Abstract

The utility model discloses a kind of machine with spiral blade reamer.The utility model includes the handle, clearance and tool body sequentially coaxially connected arrangement from tool tail to tool head;One end of handle is fixedly installed with external numerical control machine tool, and at least four tool ridges are provided on the outer circumferential surface of tool body, and each tool ridge is sequentially arranged from the tail end of tool head of tool body to clearance.The utility model can improve the feed amount in the reamer processing process, improve the chip removal effect, and also help to improve the smoothness of the processing hole wall and slow down the reamer wear speed.

Description

Technical Field

[0001] This utility model relates to the field of CNC cutting tools, and in particular to a machine-grade spiral reamer. Background Technology

[0002] A reamer is a rotary cutting tool used to perform reaming operations. A reamer has a cutting head with a rotation axis. Currently, common reamers have six or more cutting edges, and most are straight-edged. Existing straight-edged reamers have too many teeth, especially when machining blind holes, making chip removal difficult, causing rapid tool wear, and easily leading to poor chip removal, tool breakage, and out-of-tolerance reaming performance, thus affecting tool life. Utility Model Content

[0003] To improve chip removal during reamer machining, reduce the possibility of reamer breakage and out-of-tolerance reaming parameters, and increase the service life of reamers, this utility model provides a machine-grade spiral blade reamer.

[0004] The technical solution adopted in this utility model is as follows:

[0005] This utility model includes a handle, a clearance part, and a blade body arranged coaxially from the tail end to the tip of the blade.

[0006] One end of the tool holder is fixed to an external CNC machine tool, and at least four tool ridges are provided on the outer circumferential surface of the tool body. Each tool ridge extends from the end of the tool head to the clearance portion.

[0007] A through hole is provided along the common central axis of the tool holder, the clearance part and the tool body, running from the tool tail to the tool head. This through hole serves as an internal cooling hole, with its end extending to the end of the tool body. The internal cooling hole is used to conduct cutting fluid. During machining, the cutting fluid is ejected through this through hole, which is beneficial for chip removal and cooling.

[0008] Four uniformly spaced and rotationally symmetrical blade ridges are spirally arranged along the central axis on the outer circumferential surface of the blade body.

[0009] The blade spines are arranged in a right-hand spiral, and the opposite blade spines are rotationally symmetrical about the center of the inner cooling hole. The angle formed by the lines connecting two adjacent blade spines and the center of the inner cooling hole is a right angle.

[0010] Each of the cutting edges has a cutting edge on one side, and the outer surface of the cutting edge is coated with a TiAlN coating with a thickness of 2-4 μm, which can significantly improve wear resistance and cutting efficiency.

[0011] The blade spine has a guide cone machined at the end of the blade tip, and the tangential direction of the guide cone is arranged at an angle to the axial direction of the blade body.

[0012] A groove is provided between two adjacent blade ridges as a chip removal groove, and each chip removal groove extends from the end face of the blade tip to a portion of the circumferential surface at the connection between the blade body and the clearance part.

[0013] The depth of each chip removal groove gradually decreases from the tip to the tail of the cutter.

[0014] The reamer is integrally formed, and the entire reamer is made of cemented carbide.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By setting a spiral ridge machined around the axis of rotation of the cutter body and a larger chip removal groove, compared with a straight-edged reamer, the chip removal effect can be effectively improved during the machining process, and the machining feed rate of the reamer can be increased. This reduces the risk of damage to the reamer during operation, extends the service life of the reamer, and stabilizes the quality of the machined workpiece.

[0017] 2. By setting the included angle between the blade ridges, the uniformity of force distribution during the cutting process is improved, making the reamer run more stably during machining.

[0018] 3. By setting a guide cone and internal cooling hole, the reamer can be effectively guided into the hole, which improves the protection of the cutting edge, the internal cooling heat dissipation effect and the chip removal effect, and also helps to extend the service life of the reamer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the end face of the blade body in this utility model.

[0021] Figure 3 This is a schematic diagram of the guide cone in this utility model.

[0022] Figure 4 for Figure 3 A magnified schematic diagram of the location and structure.

[0023] In the diagram: 1. Tool body, 2. Tool holder, 3. Chip removal groove, 4. Clearance section, 5. Internal cooling hole, 11. Tool spine, 12. Guide cone. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The structural schematic diagram of this utility model is shown below. Figure 1As shown, the tool includes a tool holder 2, a clearance portion 4, and a tool body 1, which are coaxially connected from the tool tail to the tool head. One end of the tool holder 2 is fixedly mounted to an external CNC machine tool. At least four tool ridges 11 are provided on the outer circumferential surface of the tool body 1, and each tool ridge 11 extends from the end of the tool head of the tool body 1 towards the clearance portion 4. In actual operation, the arrangement direction of the reamer is determined by the fixed CNC machine tool.

[0026] A through hole is provided along the common central axis of the tool holder 2, the clearance part 4 and the tool body 1, running from the tool tail to the tool head. This hole serves as an internal cooling hole 5, with its end extending to the end of the tool body 1. The internal cooling hole 5 is used to conduct cutting fluid, reducing the heat generated during machining. It can also flush out the iron chips generated during machining along the chip removal groove through the cutting fluid, further improving tool life and ensuring the requirements of reaming technology.

[0027] Four uniformly spaced and rotationally symmetrical cutting ridges 11 are spirally arranged along the central axis on the outer circumferential surface of the cutter body 1. Reducing the number of cutting ridges can increase the chip space of the reamer, which is beneficial for chip removal and further reduces the possibility of damage to the reamer during operation.

[0028] A schematic diagram of the cutter head end face of cutter body 1 is shown below. Figure 2 As shown, the cutting spines 11 are arranged along a spiral direction, specifically along a right spiral. The relative cutting spines 11 are rotationally symmetrical about the center of the inner cooling hole 5. The angle formed by the line connecting two adjacent cutting spines 11 and the center of the inner cooling hole 5 is a right angle, which can improve the uniformity of force on the cutting body during the cutting process.

[0029] Each tool ridge 11 has a cutting edge on one side. The surface of the cutting edge of the tool ridge 11 is coated with a TiAlN coating using a physical vapor deposition (PVD) process, with a coating thickness of 3μm±1μm. This coating can significantly reduce the coefficient of friction during the cutting process, improve the tool's high-temperature resistance and anti-adhesion ability, and further extend its service life.

[0030] The structural schematic diagram of the guide cone 12 is shown below. Figure 3 As shown, the ridge 11 has a chamfer at the end of the cutter head to serve as a guide cone 12. The tangential direction of the guide cone 12 is arranged at a 25° angle with the axial direction of the cutter body 1, which can effectively guide the reamer into the hole and improve the protection of the cutting edge.

[0031] A groove is provided between two adjacent cutting spines 11 as a chip removal groove 3. Each chip removal groove 3 extends from the end face of the cutting head of the cutting body 1 to a part of the circumferential surface at the connection between the cutting body 1 and the clearance part 4, which is conducive to the discharge of cutting chips.

[0032] The depth of each chip removal groove 3 gradually decreases from the head to the tail of the tool. The edge of each chip removal groove 3 near the end of the tool holder 2 is arc-shaped, which is more conducive to the discharge of cutting chips than a straight edge.

[0033] The reamer is molded in one piece, and the entire reamer is made of cemented carbide.

[0034] Reference Figure 3 , 4 On the end of the cutter spine 11 facing away from the tool holder 2, guide cones 12, a and b, are machined. Compared to the typical design of a guide cone with one chamfer, this design adds one chamfer to the guide cone. a forms a 22° angle with the cutting edge, and b forms an 8° angle with the cutting edge. These are positioned sequentially at the front end of the tool body 1. Furthermore, two radius fillets, I and II, with a radius of 2.5mm are provided at the transition between the guide cone 12 and the tool body 1, effectively dispersing machining stress and enhancing the structural strength of the guide cone. This effectively guides the reamer into the hole, improving the reamer's accurate workpiece positioning during machining, increasing its cutting efficiency, and enhancing the protection of the cutting edge.

[0035] The above description of the embodiments is intended to detail the technical concept and key features of this utility model, and is aimed at helping those skilled in the art to understand the content of the utility model and implement it accordingly, but is not intended to limit the scope of protection of this utility model. Any equivalent substitutions, changes or modifications made based on the core spirit and technical essence of this utility model should be considered as being covered within the scope of protection of this utility model, so as to ensure the applicability and innovativeness of its technical solution in various situations.

Claims

1. A machine-grade spiral reamer, characterized in that: It includes a handle (2), a clearance part (4), and a blade body (1) arranged coaxially from the tail to the tip of the blade. One end of the tool holder (2) is fixed to an external CNC machine tool. At least four tool ridges (11) are provided on the outer circumferential surface of the tool body (1). Each tool ridge (11) extends from the end of the tool head of the tool body (1) to the clearance part (4).

2. A machine-grade spiral reamer according to claim 1, characterized in that... A through hole is provided along the common central axis of the tool holder (2), the clearance part (4) and the tool body (1), extending from the tool tail to the tool head, serving as an internal cooling hole (5). The end of the internal cooling hole (5) extends to the end of the tool body (1), and the internal cooling hole (5) is used to conduct cutting fluid.

3. A machine-grade spiral reamer according to claim 2, characterized in that: On the outer circumferential surface of the blade body (1), four uniformly spaced and rotationally symmetrical blade ridges are spirally arranged along the central axis.

4. A machine-grade spiral reamer according to claim 3, characterized in that: The blade spines (11) are arranged in a right spiral. The opposite blade spines (11) are rotationally symmetrical about the center of the inner cooling hole (5). The angle formed by the lines connecting two adjacent blade spines (11) and the center of the inner cooling hole (5) is a right angle.

5. A machine-grade spiral reamer according to claim 3, characterized in that: Each of the blade spines (11) has a cutting edge on one side, and the outer surface of the cutting edge is coated with a TiAlN coating with a coating thickness of 2-4 μm.

6. A machine-grade spiral reamer according to claim 3, characterized in that: The blade spine (11) has a guide cone (12) machined at the end of the blade tip. The tangential direction of the guide cone (12) is arranged at an angle to the axial direction of the blade body (1).

7. A machine-grade spiral reamer according to claim 3, characterized in that: A groove is provided between two adjacent blade ridges (11) as a chip removal groove (3), and each chip removal groove (3) extends from the end face of the blade head of the blade body (1) to a part of the circumferential surface at the connection between the blade body (1) and the clearance part (4).

8. A machine-grade spiral reamer according to claim 7, characterized in that: The groove depth of each chip removal groove (3) gradually decreases along the direction from the head to the tail of the cutter.

9. A machine-grade spiral reamer according to claim 1, characterized in that... The reamer is integrally formed, and the entire reamer is made of cemented carbide.

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