Forming milling cutter

Abstract

The utility model discloses a forming milling cutter which comprises a cutter head and a cutter handle which are integrally formed, an end edge is arranged on the end face of the front end of the cutter head, three spiral cutter grooves are formed in the circumferential direction of the cutter head, a circumferential edge is formed between every two adjacent cutter grooves, and an outer contour cutting edge and an inner contour cutting edge are arranged on each circumferential edge at intervals from front to back. The outer contour cutting edge is convexly arranged on the circumferential edge, and the front end of the outer contour cutting edge is connected with the end edge; the inner contour cutting edge is concavely arranged on the circumferential edge and is connected with the rear end of the outer contour cutting edge through the transition edge; the outer contour cutting edge and the inner contour cutting edge are each of an arc-shaped structure. Plane milling, outer arc outline and inner arc outline are integrated, three procedures of plane machining and inner and outer outline machining can be completed through one-time machining, tools do not need to be replaced frequently, production efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machining tools, and in particular to a forming milling cutter for machining a mobile phone middle frame and a 3D surface. Background Art

[0002] Cutting tools are tools used for cutting in mechanical manufacturing, also known as cutting tools. In the field of 3C processing, the processing of the mobile phone middle frame requires plane milling, inner contour, outer contour and other processing processes. Each of the above processes needs to be carried out separately in sequence with the required cutting tools. The work efficiency is quite low if they are processed separately.

[0003] In order to continuously improve operating efficiency and reduce production costs, it is necessary to improve the existing forming milling cutter so that it can integrate plane milling and contouring, and can complete the above three processes in one processing, greatly improving production efficiency. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the utility model provides a forming milling cutter, which can be used for multiple purposes, improve efficiency and reduce costs.

[0005] The utility model adopts the following technical solution to solve its technical problems: providing a forming milling cutter, comprising an integrally formed cutter head and a cutter handle, the front end face of the cutter head being provided with an end edge, three spirally arranged cutter grooves being opened on the circumference of the cutter head, a peripheral edge being formed between adjacent cutter grooves, each peripheral edge being provided with an outer contour cutting edge and an inner contour cutting edge spaced from front to rear, the outer contour cutting edge being convexly arranged on the peripheral edge and its front end being connected to the end edge; the inner contour cutting edge being concavely arranged on the peripheral edge and being connected to the rear end of the outer contour cutting edge through a transition edge; the outer contour cutting edge and the inner contour cutting edge are respectively arc-shaped structures.

[0006] As a further improvement of the utility model, the transition edge is arranged to be inclined from front to back and toward one side of the axis of the cutter head.

[0007] As a further improvement of the present invention, the blade diameter of the outer contour cutting edge is larger than the handle diameter of the tool handle, and the blade diameter of the inner contour cutting edge is smaller than the handle diameter of the tool handle.

[0008] As a further improvement of the utility model, the helix angle of the tool groove is 24°, and the rake angle is 17°; the length of the tool groove is 0.3 times the total length of the milling cutter, and the width of the tool groove is 3 times the width of the peripheral blade.

[0009] As a further improvement of the present invention, the first clearance angle of the peripheral blade is 9° to 11°, the second clearance angle is 19° to 21°, and the third clearance angle is 27° to 29°.

[0010] As a further improvement of the utility model, the front angle of the end blade is 5°, the first back angle of the end blade is 9° to 11°, and the second back angle of the end blade is 19° to 21°.

[0011] As a further improvement of the utility model, the edge inclination angle of the end blade is 2°, and the tooth gap angle is 35°.

[0012] As a further improvement of the present invention, the length of the end edge is 1 / 3 of the diameter of the outer contour cutting edge.

[0013] As a further improvement of the utility model, the core thickness of the cutter head is 0.54 to 0.6 times the diameter of the cutter handle.

[0014] The beneficial effects of the utility model are as follows: the forming milling cutter provided by the utility model integrates plane milling, outer arc contour and inner arc contour, and can complete three processes of plane, inner and outer contour processing in one processing, without the need for frequent tool replacement, thereby improving production efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 For this utility model Figure 1 Schematic diagram of the cross-sectional state of AA;

[0017] Figure 3 This is a schematic diagram of the end blade structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the plane milling processing state of the utility model;

[0019] Figure 5 This is a schematic diagram of the outer contour processing state of the utility model;

[0020] Figure 6 It is a schematic diagram of the inner contour processing state of the utility model.

[0021] Combined with the accompanying drawings, the following description is given:

[0022] 1. Cutter head; 11. End edge; 12. Cutter groove; 13. Peripheral edge; 131. Outer contour cutting edge 132. Transition edge 133. Inner contour cutting edge 2. Cutter handle. DETAILED DESCRIPTION

[0023] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0024] See also Figures 1 to 3The forming milling cutter provided by the utility model is a columnar body formed integrally by a cutter head 1 and a cutter handle 2. The tool device clamps the cutter handle 2 and drives it to rotate around the axis to realize the milling processing of the workpiece by the cutter head 1. The front end face of the cutter head 1 is provided with an end blade 11. Three spirally arranged cutter grooves 12 are opened on the circumference of the cutter head 1. A peripheral blade 13 is formed between adjacent cutter grooves 12. Each peripheral blade 13 is provided with an outer contour cutting edge 131 and an inner contour cutting edge 133 from front to back. The outer contour cutting edge 131 is convexly arranged on the peripheral blade 13 and its front end is connected to the end blade 11; the inner contour cutting edge 133 is concavely arranged on the peripheral blade 13 and connected to the rear end of the outer contour cutting edge 131 through a transition blade 132; the outer contour cutting edge 131 and the inner contour cutting edge 133 are semicircular structures respectively. The transition blade 132 is arranged from front to back and tilted toward one side of the axis of the cutter head 1. The setting of the outer contour cutting edge 131 and the inner contour cutting edge 133 can realize the processing of the mobile phone middle frame and the 3D surface at the same time, reduce the tool cost and improve the processing efficiency.

[0025] See also Figures 4 to 6 By sequentially setting the outer contour cutting edge 131 and the inner contour cutting edge 133 of the semicircular structure on the peripheral blade 13, the forming milling cutter can complete three processing steps at one time, reduce the frequency of tool replacement, and improve production efficiency. By setting the transition edge 132 between the outer contour cutting edge 131 and the inner contour cutting edge 133, the strength of the peripheral blade 13 is ensured, and processing interference between the cutting edges of the tool during different processing steps is avoided, thereby ensuring the effectiveness of processing.

[0026] Specifically, the following description is made by taking the example that the total length of the forming milling cutter is L=50 mm, the shank diameter is D=10 mm, and the blade width of the peripheral blade 13 is 1.5 mm.

[0027] The blade diameter of the outer contour cutting edge 131 is larger than the handle diameter of the tool handle 2, and the blade diameter of the inner contour cutting edge 133 is smaller than the handle diameter of the tool handle 2. In this example, the blade diameter of the outer contour cutting edge 131 is 12 mm. Since the inner contour cutting edge 133 is recessed on the peripheral blade 13, the blade diameter of the inner contour cutting edge 133 is necessarily smaller than the diameter of the peripheral blade 13.

[0028] The tool groove 12 is formed by spirally extending the end edge 11 to one end of the shank 2, and its spiral angle α is 24°, and the front angle β is 17°; the length of the tool groove 12 is 0.3 times the total length of the milling cutter, and the groove length is 15 mm; the groove width of the tool groove 12 is 3 times the width of the peripheral edge 13, and the groove width of the tool groove 12 is 4.5 mm. The spiral angle of the tool groove 13 and the ratio of the groove length and groove width are set to ensure the chip removal ability of the tool groove 13, so that the chip removal is smooth. At the same time, the width of 1.5 mm improves the cutting ability of the outer contour cutting edge 131 and the inner contour cutting edge 133 on the peripheral edge 13 to prevent chipping or fracture. In addition, the first back angle a of the peripheral edge 13 is 10°, the second back angle b is 20°, and the third back angle c is 28°. The setting of the peripheral edge back angle can meet the cutting strength and improve the cutting efficiency. At the same time, the setting of the back angle can strengthen the avoidance of each cutting edge, so that the chips are not easy to be congested during the cutting process.

[0029] Furthermore, the inclination angle 6 of the end blade 11 is 2°, and the tooth gap angle f is 35°. When the end blade 11 performs plane milling, the setting of the inclination angle and the tooth gap angle helps to guide the waste chips into the tool groove 13, and prevent the waste chips from adhering to the tool surface during milling, resulting in the end blade 11 not being able to mill normally. The blade length of the end blade 11 is 4mm. The sufficiently long end blade increases the milling surface and improves the plane milling efficiency. The end blade rake angle γ of the end blade 11 is 5°, the first end blade clearance angle d is 10°, and the second end blade clearance angle e is 20°. By setting the two clearance angles, the contact amount between the end blade 11 and the cut surface can be adjusted to avoid chipping and defect of the end blade 11; the setting of the rake angle makes the cutting edge sharp and improves work efficiency.

[0030] Furthermore, the core thickness of the cutter head 1 is 0.54 to 0.6 times the diameter of the handle 2. The core thickness is preferably 5 mm to ensure the overall strength of the profiled milling cutter to support the peripheral blade to perform side milling operations.

[0031] To sum up, the forming milling cutter provided by the utility model, by arranging an outer contour cutting edge and an inner contour cutting edge on the peripheral edge, can meet the needs of processing three different forms of milling operations, realize multiple uses of one tool, improve work efficiency, and reduce processing costs; at the same time, by arranging a transition edge between the outer contour cutting edge and the inner contour cutting edge, it is ensured that no processing interference occurs between the cutting edges during different forms of milling operations, and it is also beneficial to the discharge of processing waste chips.

[0032] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A forming milling cutter, comprising an integrally formed cutter head (1) and a cutter handle (2), wherein the front end surface of the cutter head (1) is provided with an end blade (11), characterized in that: The cutter head (1) is provided with three spirally arranged cutting grooves (12) on the circumference, and a peripheral blade (13) is formed between adjacent cutting grooves (12). Each peripheral blade (13) is provided with an outer contour cutting edge (131) and an inner contour cutting edge (133) at intervals from front to back. The outer contour cutting edge (131) is convexly arranged on the peripheral blade (13) and its front end is connected to the end blade (11); the inner contour cutting edge (133) is concavely arranged on the peripheral blade (13) and is connected to the rear end of the outer contour cutting edge (131) via a transition blade (132); the outer contour cutting edge (131) and the inner contour cutting edge (133) are respectively arc-shaped structures.

2. The profile milling cutter according to claim 1, characterized in that: The transition edge (132) is arranged to be inclined from front to back and toward one side of the axis of the cutter head (1).

3. The profile milling cutter according to claim 1, characterized in that: The blade diameter of the outer contour cutting edge (131) is greater than the shank diameter of the tool handle (2), and the blade diameter of the inner contour cutting edge (133) is smaller than the shank diameter of the tool handle (2).

4. The profile milling cutter according to claim 1, characterized in that: The helix angle of the tool groove (12) is 24°, and the rake angle is 17°; the groove length of the tool groove (12) is 0.3 times the total length of the milling cutter, and the groove width of the tool groove (12) is 3 times the width of the peripheral blade (13).

5. The profile milling cutter according to claim 4, characterized in that: The first clearance angle of the peripheral blade (13) is 9° to 11°, the second clearance angle is 19° to 21°, and the third clearance angle is 27° to 29°.

6. The profile milling cutter according to claim 5, characterized in that: The end edge (11) has an end edge front angle of 5°, an end edge first rear angle of 9° to 11°, and an end edge second rear angle of 19° to 21°.

7. The profile milling cutter according to claim 6, characterized in that: The edge inclination angle of the end edge (11) is 2°, and the tooth gap angle is 35°.

8. The profile milling cutter according to claim 1, characterized in that: The edge length of the end edge (11) is 1 / 3 of the edge diameter of the outer contour cutting edge (131).

9. The profile milling cutter according to claim 1, characterized in that: The core thickness of the tool head (1) is 0.54 to 0.6 times the shank diameter of the tool handle (2).

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