Five-axis machining center carbide round bar offset center outer diameter machining tool

Abstract

This invention provides a five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center. It includes a tool holder, a cutting head at the front end of the tool holder, and a side pressure surface along the axial direction from the rear end to the front. An axial tangent surface is located near the cutting head on the side pressure surface, forming a relief groove between the axial tangent surface and the cutting head. An eccentric arc surface is located on the tool holder between the side pressure surface and the axial tangent surface, and the eccentric arc surface is located clockwise from the side pressure surface. The eccentric arc surface and the side pressure surface are at a 90° angle in the circumferential direction. The diameter φ1 of the tool holder and the diameter φ2 of the eccentric arc surface are equal, and the eccentricity P between the tool holder and the eccentric arc surface is 0.3 times the diameter. This tool is formed in one step through a five-axis machining center program adjustment. Compared with other boring tools, the relief groove type of this tool has higher strength and tool rigidity.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center. Background Technology

[0002] Offset center outer diameter machining of cemented carbide round bars is a special turning process for high-hardness materials, mainly used to manufacture parts with non-coaxial structures (such as eccentric shafts, stepped shafts, etc.). Due to the high hardness (up to HRA89-93) and brittleness of cemented carbide, the requirements for equipment, cutting tools, and process parameters during machining are much higher than for ordinary metal materials.

[0003] Currently, machining the outer diameter of an offset center on a cemented carbide round bar requires a combination of multiple cutting tools and a fixture, resulting in low machining efficiency and difficulty in controlling accuracy during tool changes. Because the product being machined has an eccentric structure, higher strength and rigidity are required for tools such as boring tools, which existing tools cannot meet. Furthermore, existing tools are all of a central structure, which can easily interfere with the workpiece or other structures during retraction when machining eccentric workpieces, making retraction inconvenient.

[0004] In view of this, it is necessary to improve the existing cutting tools to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center, including a tool holder, a tool head at the front end of the tool holder, a side pressure surface along the axial direction from the rear end to the front of the tool holder, an axial tangent surface near the tool head on the side pressure surface, a relief groove formed between the axial tangent surface and the tool head, the relief groove being a rear angle structure, an eccentric arc surface on the tool holder between the side pressure surface and the axial tangent surface, the eccentric arc surface being located clockwise on the side pressure surface, and the position of the eccentric arc surface and the side pressure surface forming a 90° angle in the circumferential direction, the axial tangent surface being located inside the side pressure surface and parallel to the side pressure surface, and the axial tangent surface being formed directly by continuing radial machining on the basis of the side pressure surface, the diameter φ1 of the tool holder and the diameter φ2 of the eccentric arc surface being equal, and the eccentricity P between the tool holder and the eccentric arc surface being 0.3 times the diameter. This eccentricity P is the clearance dimension of the eccentric circle where the eccentric arc surface is located. The entire blade is also coated with a black coating.

[0007] Furthermore, the cutting head has a cutting edge at its front end, and a concave arc-shaped chip removal groove at the junction of the cutting head and the axial tangent surface. An inclined front face is formed between the chip removal groove and the cutting edge. The cutting head also has a rear face connected to the cutting edge at its front end. The entire cutting head is inclined towards one side of the eccentric arc surface, and the axial inclination angle α7 of the side edge closest to the eccentric arc surface is 50°. The intersection of this side edge and the cutting edge forms the cutting tip.

[0008] Preferably, the angle α2 between the rake face and the axial section is 12°; and the angle α6 between the flank face and the cross section is 3°.

[0009] Preferably, the blade tip is arc-shaped with a radius R of 0.15 mm.

[0010] Furthermore, the contour of the back of the cutter head is flattened circumferentially to form a continuous first, second, and third tangential surface. The angle α3 between the first tangential surface and the tangent direction is 13°, the angle α4 between the second tangential surface and the tangent direction is 39°, and the angle α5 between the third tangential surface and the tangent direction is 72°. The first, second, and third tangential surfaces are all machined by CNC grinding.

[0011] Furthermore, the tail end of the side pressure surface is provided with a first inclined surface, the tail end of the eccentric arc surface is provided with a second inclined surface, and the tail end of the axial tangent surface is provided with a third inclined surface, and the inclination angle α1 of the first, second, and third inclined surfaces is 45°. The inclined surfaces are at a 45° angle to both the radial and axial directions.

[0012] Furthermore, the tool holder has an axially extending spindle positioning groove at its rear end. This is used for quick positioning when mounting the tool on the spindle of a five-axis machining center, reducing the time spent on debugging and tool changes.

[0013] Preferably, the axial length H1 of the cutter head is 1.4 mm. This axial length includes the length from the chip removal groove to the cutter tip.

[0014] Preferably, the thickness H2 from the axial section to the outer side of the tool holder is 3.1 mm; the distance H3 from the axial section to the junction of the third section and the side of the tool holder is 2.8 mm; and the distance H4 from the axial section to the junction of the second and third sections is 2.2 mm.

[0015] The beneficial effects of this utility model are as follows: The five-axis machining center carbide round bar offset center outer circle machining tool provided by this utility model, compared with other carbide round bar offset center outer circle machining tools, does not require additional fixtures and can be formed in one step through the five-axis machining center program adjustment; compared with other boring tools, the back angle relief groove of this tool has higher strength and tool rigidity, and is easy to retract. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the main structure of the cutting tool of this utility model.

[0018] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0019] Figure 3 This is a right-side structural schematic diagram of the cutting tool of this utility model.

[0020] Figure 4 yes Figure 3 A magnified structural diagram at point B in the middle.

[0021] Figure 5 This is a top view of the cutting tool of this utility model.

[0022] Figure 6 This is a bottom view of the cutting tool of this utility model.

[0023] Figure 7 This is a bottom view of the cutting tool of this utility model.

[0024] Figure 8 This is a schematic diagram of the cutting tool of this utility model (the cutting head part).

[0025] In the diagram: 1. Tool holder, 2. Tool head, 3. Spindle positioning groove, 4. Side pressure surface, 5. First inclined surface, 6. Eccentric arc surface, 7. Second inclined surface, 8. Axial section, 9. Third inclined surface, 10. Relief groove, 11. Chip removal groove, 12. Rake face, 13. Cutting edge, 14. Back face, 15. Tool tip, 16. First cutting surface, 17. Second cutting surface, 18. Third cutting surface. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figures 1-8As shown, this utility model discloses a five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center. The tool holder 1 has an axially extending spindle positioning groove 3 at its rear end and a cutting head 2 at its front end. A side pressure surface 4 is provided on the side of the tool holder 1 along the axial direction from the rear end forward, facilitating connection with the machining center spindle. An axial tangent surface 8 is provided on the side pressure surface 4 near the cutting head 2, forming a tool relief groove 10 between the axial tangent surface 8 and the cutting head 2. An eccentric arc surface 6 is provided on the tool holder 1 between the side pressure surface 4 and the axial tangent surface 8. Surface 6 is located clockwise from the side pressure surface 4, and the eccentric arc surface 6 is at a 90° angle to the side pressure surface 4 in the circumferential direction. The axial tangent surface 8 is located inside the side pressure surface 4 and parallel to it. The axial tangent surface 8 is formed directly by further radial machining on the side pressure surface 4. The tail of the side pressure surface 4 is provided with a first inclined pull surface 5, the tail of the eccentric arc surface 6 is provided with a second inclined pull surface 7, and the tail of the axial tangent surface 8 is provided with a third inclined pull surface 9. The inclination angle α1 of the first inclined pull surface 5, the second inclined pull surface 7, and the third inclined pull surface 9 is all 45°. The diameter φ1 of the tool holder 1 is equal to the diameter φ2 of the eccentric arc surface 6, and the eccentricity P between the tool holder 1 and the eccentric arc surface 6 is 0.3 times the diameter. In this embodiment, a distance is left between the tail of the side pressure surface 4 and the end of the tool holder 1, that is, the length of the side pressure surface 4 should not be ground through along the axis. The diameter φ1 of the handle 1 is 6mm, the diameter φ2 of the eccentric arc surface 6 is 6mm, and the eccentricity P is 1.8mm. The axial length H1 of the cutter head 2 is 1.4mm. This axial length includes the length from the chip removal groove 11 to the cutting tip 15. The front end of the cutter head 2 is provided with a cutting edge 13, and the junction of the cutter head 2 and the axial section 8 is provided with a concave arc-shaped chip removal groove 11. The chip removal groove 11 and the cutting edge 13 form an inclined front cutting face 12. The front end of the cutter head 2 is provided with a rear cutting face 14 connected to the cutting edge 13. The cutter head 2 is inclined towards the eccentric arc surface 6, and the side of the cutter head 2 closest to the eccentric arc surface 6 has an axial inclination angle α7 of 50°. The intersection of the side and the cutting edge 13 forms the cutting tip 15. The angle α2 between the front cutting face 12 and the axial section is 12°; the angle α6 between the rear cutting face 14 and the cross section is 3°. The blade tip 15 is arc-shaped with a radius R of 0.15 mm.

[0030] like Figure 6 and Figure 7As shown, the contour of the back of the cutter head 2 is flattened circumferentially to form a continuous first cut surface 16, a second cut surface 17, and a third cut surface 18. The angle α3 between the first cut surface 16 and the tangent direction is 13°, the angle α4 between the second cut surface 17 and the tangent direction is 39°, and the angle α5 between the third cut surface 18 and the tangent direction is 72°. The first cut surface 16, the second cut surface 17, and the third cut surface 18 are all machined by CNC grinding. The thickness H2 of the axial cut surface 8 to the outside of the tool holder 1 is 3.1 mm; the distance H3 between the axial cut surface 8 and the junction of the third cut surface 18 and the side of the tool holder 1 is 2.8 mm; and the distance H4 between the axial cut surface 8 and the junction of the second cut surface 17 and the third cut surface 18 is 2.2 mm.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A five-axis machining center tool for machining the outer diameter of a carbide round bar with an offset center, characterized in that: The tool includes a handle, a cutting head at the front end of the handle, a side pressure surface along the axial direction from the rear end forward on the side of the handle, an axial tangent surface near the cutting head on the side pressure surface, a relief groove formed between the axial tangent surface and the cutting head, an eccentric arc surface on the handle between the side pressure surface and the axial tangent surface, the eccentric arc surface being located clockwise on the side pressure surface, and the position of the eccentric arc surface and the side pressure surface forming a 90° angle in the circumferential direction, the diameter φ1 of the handle and the diameter φ2 of the eccentric arc surface being equal, and the eccentricity P between the handle and the eccentric arc surface being 0.3 times the diameter.

2. The five-axis machining center carbide round bar offset center outer circle machining tool as described in claim 1, characterized in that: The cutting head has a cutting edge at its front end, and a concave arc-shaped chip removal groove is provided at the junction of the cutting head and the axial tangent. An inclined front cutting face is formed between the chip removal groove and the cutting edge. The cutting head has a rear cutting face connected to the cutting edge at its front end. The cutting head is inclined to one side of the eccentric arc surface, and the axial inclination angle α7 of the side of the cutting head close to the eccentric arc surface is 50°. The intersection of the side and the cutting edge forms the cutting tip.

3. The five-axis machining center carbide round bar offset center outer circle machining tool as described in claim 2, characterized in that: The angle α2 between the rake face and the axial section is 12°; the angle α6 between the flank face and the cross section is 3°.

4. The five-axis machining center carbide round bar offset center outer circle machining tool as described in claim 2, characterized in that: The blade tip is arc-shaped with a radius R of 0.15 mm.

5. The five-axis machining center carbide round bar offset center outer circle machining tool as described in claim 2, characterized in that: The contour of the back of the cutter head is cut flat along the circumference to form a continuous first cut surface, a second cut surface, and a third cut surface. The angle α3 between the first cut surface and the tangent direction is 13°, the angle α4 between the second cut surface and the tangent direction is 39°, and the angle α5 between the third cut surface and the tangent direction is 72°.

6. The five-axis machining center carbide round bar offset center outer diameter machining tool as described in claim 1, characterized in that: The tail end of the side pressure surface is provided with a first inclined pull surface, the tail end of the eccentric arc surface is provided with a second inclined pull surface, and the tail end of the axial tangent surface is provided with a third inclined pull surface, and the inclination angle α1 of the first inclined pull surface, the second inclined pull surface and the third inclined pull surface are all 45°.

7. The five-axis machining center carbide round bar offset center outer diameter machining tool as described in claim 1, characterized in that: The tool holder has an axially extending spindle positioning groove at its rear end.

8. The five-axis machining center carbide round bar offset center outer diameter machining tool as described in claim 1, characterized in that: The axial length H1 of the cutter head is 1.4 mm.

9. The five-axis machining center carbide round bar offset center outer diameter machining tool as described in claim 1, characterized in that: The thickness H2 from the axial section to the outside of the tool holder is 3.1 mm; the distance H3 from the axial section to the junction of the third section and the side of the tool holder is 2.8 mm; and the distance H4 from the axial section to the junction of the second and third sections is 2.2 mm.

Images