Inner-cooling forming reamer for machining inner hole

Abstract

The utility model discloses an inner-cooling forming reamer for machining an inner hole. The blade part and the handle part are integrally formed; the blade part is provided with a hole bottom cutting flat blade, a stepped forming blade, a drill back, chip grooves and auxiliary grooves, the hole bottom cutting flat blade is arranged at the foremost end of the blade part, the stepped forming blade extends from the end of the blade part to the handle part, the chip grooves are formed in the two sides of the drill back, and the auxiliary grooves are formed in the drill back; and the inner cooling channel is arranged from the end part of the blade part to the tail part of the handle part along the central shaft in a penetrating manner. According to the inner-cooling forming reamer for machining the inner hole, the auxiliary grooves are additionally formed, edge-dividing machining can be achieved through the auxiliary grooves, repeated grinding is achieved, the machining efficiency is higher, the stepped forming edges are arranged, the accuracy of the formed contour can be guaranteed through the reasonable structural design of the stepped forming edges, the strength of all the cutting edges is good, the machining efficiency and quality are improved, and the machining cost is reduced. And the service life of the cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, and particularly relates to an internally cooled forming reamer for machining internal holes. Background Art

[0002] In the prior art, for the internally cooled forming reamer used for machining internal holes, due to the unreasonable design of its cutting edge part, it is difficult to achieve multiple grinding operations, resulting in low efficiency. In addition, the design of the cooling channel of the internally cooled forming reamer is also very important. If the coolant cannot effectively reach the cutting area, it will cause the cutting temperature to rise, increase the friction between the chip and the tool surface, and easily generate chip sticking phenomenon, affecting the tool life and machining quality.

[0003] Therefore, in order to solve the above technical problems, the utility model designs a new structure of an internally cooled forming reamer for machining internal holes. By adding a secondary groove, the secondary groove can perform split-edge machining to achieve multiple grinding operations, with higher machining efficiency. By designing the cutting edge part as a stepped forming edge, the reasonable structure of the stepped forming edge can ensure the accuracy of the forming contour. At the same time, the strength of each cutting edge is good, and it can still maintain a good geometric shape and size after multiple grinding operations. An internal cooling channel is arranged along the central axis from the end of the cutting edge part to the tail of the shank, which can effectively transport the coolant to the cutting area, improve the cooling effect, reduce the cutting temperature, reduce the chip sticking phenomenon, and extend the tool life. Summary of the Utility Model

[0004] Utility Model Objective: To overcome the above deficiencies, the objective of the utility model is to provide an internally cooled forming reamer for machining internal holes. By adding a secondary groove, split-edge machining is achieved, with higher efficiency. A reasonable stepped forming edge structure is designed, which can ensure the accuracy of the forming contour. At the same time, the strength of each cutting edge is good, improving the machining efficiency and quality, extending the service life of the tool, and having a wide application prospect.

[0005] Technical Solution: An internally cooled forming reamer for machining internal holes, comprising:

[0006] A shank;

[0007] A cutting edge part, the cutting edge part is integrally formed with the shank; the cutting edge part is provided with a flat-bottom cutting edge at the hole bottom, a stepped forming edge, a drill back, a chip flute, and a secondary groove. The flat-bottom cutting edge at the hole bottom is arranged at the forefront of the cutting edge part. The stepped forming edge extends from the end of the cutting edge part towards the shank. The chip flutes are arranged on both sides of the drill back. The secondary groove is arranged on the drill back;

[0008] An internal cooling channel, an internal cooling channel is arranged along the central axis from the end of the cutting edge part to the tail of the shank.

[0009] The internal cooling forming reamer for machining internal holes described in the present utility model has a reasonable structural design. Chip removal grooves are provided on both sides of the drill back as main grooves to play the role of chip removal. A secondary groove is also provided on the drill back. The secondary groove can not only perform split-edge machining to achieve multiple regrinds and improve machining efficiency, but also play the roles of chip splitting and chip removal. An internal cooling channel is provided along the central axis from the end of the cutting edge to the end of the shank, which can effectively transport the coolant to the cutting area, improve the cooling effect, reduce the cutting temperature, extend the tool life, and reduce the chip sticking phenomenon.

[0010] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, the stepped forming edge is successively provided with a first forming edge, a first side edge, a second forming edge, a second side edge, a third forming edge, a third side edge, and an end face deburring edge from front to back.

[0011] The design of the above stepped forming edge can accurately ensure the contour of the machined internal hole and improve the machining accuracy.

[0012] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, a first transitional arc edge is provided between the first forming edge and the first side edge, a chamfer edge is provided between the first side edge and the second forming edge, and a second transitional arc edge is provided between the second forming edge and the second side edge.

[0013] The above design improves the strength of the cutting edge, enables the cutting edge to still maintain a good geometric shape and size after multiple regrinds, and improves the life of the internal cooling forming reamer.

[0014] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, the chamfer edge, the second forming edge, the second transitional arc edge, and the second side edge are provided in the secondary groove.

[0015] This part of the stepped forming edge is provided in the secondary groove, which can achieve staggered machining. Function: good cutting edge strength and can be regrinded multiple times, so as to achieve the effect of cost reduction and efficiency improvement.

[0016] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, the cutting edge diameter at the end of the cutting edge is equal to the shank diameter of the shank.

[0017] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, the internal cooling channel enters water from the end of the shank and exits water from the end of the cutting edge.

[0018] Further, in the above-mentioned internal cooling forming reamer for machining internal holes, the angle formed by the first forming edge and the horizontal central axis is 45°, the angle formed by the second forming edge and the horizontal central axis is 90°, the angle formed by the third forming edge and the horizontal central axis is 15°, and the angle formed by the end face deburring edge and the horizontal central axis is 30°; the first side edge, the second side edge, and the third side edge are all horizontally arranged; the angle formed by the chamfer edge and the horizontal central axis is 30°.

[0019] The beneficial effects of the present utility model are as follows: The internally cooled forming reamer for machining internal holes of the present utility model has a reasonable structural design. By adding a secondary groove, the secondary groove can perform split-edge machining, enabling the internally cooled forming reamer to be ground multiple times, with higher machining efficiency, achieving the effect of cost reduction and efficiency increase. Through the stepped forming edge design of the cutting edge, its reasonable structure can ensure the accuracy of the formed contour. At the same time, the strength of each cutting edge is good, and it can still maintain a good geometric shape and dimensions after being ground multiple times. An internally cooled channel is provided axially from the end of the cutting edge to the tail of the shank, which can effectively transport the coolant to the cutting area, improving the cooling effect, reducing the cutting temperature, extending the tool life, and reducing the chip sticking phenomenon, with a wide application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic view of the overall structure of the internally cooled forming reamer for machining internal holes of the present utility model Figure 1 ;

[0021] Figure 2 is a schematic view of the overall structure of the internally cooled forming reamer for machining internal holes of the present utility model Figure 2 ;

[0022] Figure 3 is a schematic view of the cutting edge structure of the internally cooled forming reamer for machining internal holes of the present utility model Figure 1 ;

[0023] Figure 4 is a schematic view of the cutting edge structure of the internally cooled forming reamer for machining internal holes of the present utility model Figure 2 ;

[0024] Figure 5 is a schematic view of the cutting edge structure of the internally cooled forming reamer for machining internal holes of the present utility model Figure 3 ;

[0025] In the figure: shank 1, cutting edge 2, flat cutting edge at the bottom of the hole 21, stepped forming edge 22, first forming edge 221, first transitional arc edge 2211, first side edge 222, chamfering edge 2221, second forming edge 223, second transitional arc edge 2231, second side edge 224, third forming edge 225, third side edge 226, end face deburring edge 227, drill back 23, chip removal groove 24, secondary groove 25, internally cooled channel 3, angle a formed by the first forming edge and the horizontal central axis, angle b formed by the second forming edge and the horizontal central axis, angle c formed by the third forming edge and the horizontal central axis, angle d formed by the end face deburring edge and the horizontal central axis, angle e formed by the chamfering edge and the horizontal central axis. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following combines the attached Figure 1 , 2, 3, 4, 5 and Embodiment 1 and Embodiment 2 are used to further illustrate the present utility model.

[0027] Embodiment 1

[0028] The internal coolant forming reamer for machining internal holes according to the present utility model aims at the problem that in the prior art, it is difficult to perform multiple regrinds during the machining of internal holes, resulting in low efficiency. Through structural optimization, it can be regrinded multiple times, achieving the effect of cost reduction and efficiency improvement, and also improving the durability of the tool.

[0029] As Figure 1 , 2 shown, the internal coolant forming reamer for machining internal holes according to the present utility model includes a shank 1 and a cutting edge part 2. The cutting edge part 2 is integrally formed with the shank 1. A flat cutting edge 21 at the hole bottom, a stepped forming edge 22, a drill back 23, a chip fluting 24, and a secondary groove 25 are provided on the cutting edge part 2. Among them, the flat cutting edge 21 at the hole bottom is arranged at the front end of the cutting edge part 2. The stepped forming edge 22 extends from the end of the cutting edge part 2 towards the shank 1. The stepped forming edge design ensures the contour of the machined internal hole. The chip fluting 24 is arranged on both sides of the drill back 23, which serves as the main groove and plays a role in chip evacuation. The secondary groove 25 is arranged on the drill back 23. The secondary groove 25 can not only perform split-edge machining to achieve multiple regrinds and improve machining efficiency, but also play a role in chip splitting and chip evacuation. An internal coolant channel 3 is arranged axially through from the end of the cutting edge part 2 to the tail of the shank 1. The internal coolant channel 3 takes in water from the tail of the shank 1 and discharges water from the end of the cutting edge part 2, which can effectively convey the coolant to the cutting area, improve the cooling effect, reduce the cutting temperature, extend the tool life, and reduce the chip sticking phenomenon.

[0030] Furthermore, as Figure 3 , 4 shown, the stepped forming edge 22 is successively provided with a first forming edge 221, a first side edge 222, a second forming edge 223, a second side edge 224, a third forming edge 225, a third side edge 226, and an end face deburring edge 227 from front to back. The above stepped forming edge design can accurately ensure the contour of the machined internal hole and improve the machining accuracy. Among them, a first transitional arc edge 2211 is arranged between the first forming edge 221 and the first side edge 222, a chamfer edge 2221 is arranged between the first side edge 222 and the second forming edge 223, and a second transitional arc edge 2231 is arranged between the second forming edge 223 and the second side edge 224. The above design improves the strength of the cutting edge, enables the cutting edge part 2 to still maintain a good geometric shape and size after multiple regrinds, and improves the life of the internal coolant forming reamer.

[0031] Furthermore, as Figure 1 , 2As shown, this part of the stepped forming edge (chamfering edge 2221, forming edge two 223, transition arc edge two 2231, side edge two 224) is arranged in the secondary groove 25, which can achieve staggered machining. Function: good edge strength and can be reground multiple times, so as to achieve the effect of cost reduction and efficiency increase.

[0032] Embodiment 2

[0033] Based on the structural basis of Embodiment 1, as Figure 1 , 2 , 3, 4, 5 shown.

[0034] As Figure 1 shown, the cutting edge diameter at the tail of the cutting edge part 2 of the internal cooling forming reamer for machining internal holes described in the present utility model is equal to the shank diameter of the shank part 1.

[0035] Furthermore, as Figure 5 shown, the included angle a formed by the first forming edge and the horizontal central axis is 45°, the included angle b formed by the second forming edge and the horizontal central axis is 90°, the included angle c formed by the third forming edge and the horizontal central axis is 15°, the included angle d formed by the end face deburring edge 227 and the horizontal central axis is 30°, the first side edge 222, the second side edge 224, and the third side edge 226 are all horizontally arranged, and the included angle e formed by the chamfering edge 2221 and the horizontal central axis is 30°.

[0036] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be regarded as the protection scope of the present utility model.

Claims

1. An internally cooled forming reamer for machining internal holes, characterized in that, Including: A shank (1); A cutting edge portion (2), the cutting edge portion (2) being integrally formed with the shank (1); the cutting edge portion (2) is provided with a flat-bottom cutting edge for hole (21), a stepped forming edge (22), a drill back (23), a chip flute (24), and a secondary groove (25). The flat-bottom cutting edge for hole (21) is provided at the foremost end of the cutting edge portion (2). The stepped forming edge (22) extends from the end of the cutting edge portion (2) towards the shank (1). The chip flute (24) is provided on both sides of the drill back (23). The secondary groove (25) is provided on the drill back (23); An internal coolant channel (3), an internal coolant channel (3) is provided through the center axis from the end of the cutting edge portion (2) to the tail of the shank (1).

2. The internal coolant forming reamer for machining an internal hole according to claim 1, characterized in that, The stepped forming edge (22) is sequentially provided with a first forming edge (221), a first side edge (222), a second forming edge (223), a second side edge (224), a third forming edge (225), a third side edge (226), and an end face deburring edge (227) from front to back.

3. The internal coolant forming reamer for machining an internal hole according to claim 2, wherein A first transition arc edge (2211) is provided between the first forming edge (221) and the first side edge (222). A chamfer edge (2221) is provided between the first side edge (222) and the second forming edge (223). A second transition arc edge (2231) is provided between the second forming edge (223) and the second side edge (224).

4. The internal cooling forming reamer for machining an internal hole according to claim 3, characterized in that, The chamfer edge (2221), the second forming edge (223), the second transition arc edge (2231), and the second side edge (224) are provided in the secondary groove (25).

5. The internal coolant forming reamer for machining an internal hole according to claim 1, characterized in that The cutting edge diameter at the tail of the cutting edge portion (2) is equal to the shank diameter of the shank (1).

6. The internal coolant forming reamer for machining an internal hole according to claim 1, characterized in that The internal coolant channel (3) enters water from the tail of the shank (1) and exits water from the end of the cutting edge portion (2).

7. The internal coolant forming reamer for machining an internal hole according to claim 3, characterized in that The angle formed by the first forming edge (221) and the horizontal central axis is 45°. The angle formed by the second forming edge (223) and the horizontal central axis is 90°. The angle formed by the third forming edge (225) and the horizontal central axis is 15°. The angle formed by the end face deburring edge (227) and the horizontal central axis is 30°. The first side edge (222), the second side edge (224), and the third side edge (226) are all horizontally arranged. The angle formed by the chamfer edge (2221) and the horizontal central axis is 30°.

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