End mill with variable taper

Abstract

The end milling cutter with the variable taper comprises a cutter body and a plurality of blades, the cutter body is provided with a plurality of cutting grooves, the blades are fixed in the cutting grooves through screws, the handle portion of the cutter body is provided with a center hole concentric with the cutter body, and a cutter setting rod is inserted into the center hole in a matched mode; the head of the tool setting rod is provided with a conical surface, and when the taper of the end mill is adjusted, the blades are attached to the conical surface. According to the end mill, the blades can have the same taper through the tool setting rod, and the taper of each side edge of the end mill can be adjusted only by changing the taper of the conical head part of the tool setting rod. In addition, the conical head portion of the tool setting rod provides support for the blades, and the blades can be prevented from moving due to loosening of the screws. The end mill has the advantages of convenience in taper adjustment, high precision, low blade replacement cost and the like.

Description

Technical Field

[0001] The utility model relates to the field of mechanical processing tools, in particular to an end milling cutter with variable taper. Background Art

[0002] Milling cutters are often used to machine conical surfaces in mechanical processing, such as trapezoidal grooves. Since trapezoidal grooves have different external bevel angles, the side edges of the milling cutter are also required to have corresponding tapers.

[0003] The milling cutters currently available on the market have fixed tapers, such as 15°, 30°, and 45°. However, in actual processing, the external bevel angles of trapezoidal slots are diverse, and most of the angles cannot be met by existing milling cutters. At present, the solution adopted by many companies is to modify the existing milling cutters with tapers so that the taper of the milling cutter side edges meets the processing requirements. However, the accuracy and performance of such modified milling cutters cannot be guaranteed, which is not only labor-intensive, but also has a high scrap rate. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model discloses a taper-variable end milling cutter, which adopts the following technical solutions:

[0005] A taper-variable end mill comprises a cutter body and a plurality of blades. The cutter body is provided with a plurality of cutting grooves, the blades are fixed in the cutting grooves by screws, a center hole concentric with the cutter body is provided on the shank of the cutter body, a tool setting rod is inserted in the center hole; the head of the tool setting rod has a conical surface, and when the taper of the end mill is adjusted, each blade fits on the conical surface.

[0006] A further improved technical solution is that the blade is in the shape of an elongated strip and is provided with at least two slotted holes for passing the screws.

[0007] To further improve the technical solution, the tool setting rod is composed of a coaxially connected rod portion and a cone head portion, and the conical surface is located on the cone head portion.

[0008] To further improve the technical solution, an internal thread is provided in the center hole, an external thread is provided on the rod portion of the tool setting rod, and the rod portion of the tool setting rod is threadedly connected to the center hole.

[0009] To further improve the technical solution, the cutting groove is an axial straight cutting groove or an oblique straight cutting groove.

[0010] To further improve the technical solution, the knife body is provided with four or six cutting grooves.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0012] The end mill can make each blade have the same taper through the tool setting bar, and the taper of each side edge of the end mill can be adjusted by simply changing the taper of the taper head of the tool setting bar. In addition, the taper head of the tool setting bar provides support for each blade, which can prevent the blade from moving due to loose screws.

[0013] Compared with the background technology, the end mill has the advantages of convenient taper adjustment, high precision, and low blade replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a structural schematic diagram of the end mill.

[0015] Figure 2 Shown is a schematic diagram of the structure of the knife body.

[0016] Figure 3 What is shown is the schematic diagram of the structure of the tool body and the tool rod.

[0017] Figure 4 Shown is another structural schematic diagram of the end mill.

[0018] In the figure:

[0019] 10. Knife body;

[0020] 11. Center hole; 12. Axial straight groove;

[0021] 20. Blade;

[0022] 21. Slotted hole;

[0023] 30. Tool bar adjustment;

[0024] 31. Rod; 32. Cone head;

[0025] 40. Screws;

[0026] 50. Nut. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] A variable taper end mill, such as Figure 1 As shown, it includes a cutter body 10 and four blades 20. The cutter body 10 is provided with four axial straight cutting grooves 12. The blades 20 are fixed in the axial straight cutting grooves 12 by screws 40. It is worth noting that the cutting grooves can also be oblique straight cutting grooves. The blades 20 are long strips, and two slotted holes 21 for passing the screws 40 are provided on the blades 20. Due to the existence of the slotted holes 21, the installation position of the blades 20 is adjustable. The blades 20 are pressed from powder alloy. Since the same pressing mold is used, each blade 20 has the same size.

[0029] like Figure 2-3 As shown, the shank of the cutter body 10 is provided with a center hole 11 concentric with the cutter body 10, and a tool setting rod 30 is inserted into the center hole 11. The tool setting rod 30 is composed of a coaxially connected rod 31 and a cone head 32, wherein the rod 31 has a size matching the center hole 11, and the cone head 32 has a conical surface, and the cone angle of the conical surface can be machined according to requirements.

[0030] When the taper of the end mill needs to be changed, the tool rod 30 is first prepared so that the conical head 32 of the tool rod 30 has the required taper angle. Then the tool rod 30 is inserted into the center hole 11, and before each blade 20 is fixed with the screw 40, the inward side of each blade 20 is fitted on the conical surface. Since the conical surface is concentric with the cutter body 10 and each blade 20 has the same shape and size, the side edge of each blade 20 is also concentric with the cutter body 10. In this way, after each blade 20 is fixed in the axial straight cutting groove 12 with the screw 40, each blade 20 has the same taper. After the blade 20 is fixed, the tool rod 30 is pulled out of the center hole 11. Obviously, when the taper of the end mill needs to be changed again, only the tool rod 30 needs to be replaced.

[0031] like Figure 4 As shown, the tool rod 30 can also be fixed in the center hole 11 during processing. Specifically, an internal thread is provided in the center hole 11, and an external thread is provided on the rod portion 31 of the tool rod 30, and the rod portion 31 of the tool rod 30 is screwed to the center hole 11. In order to prevent the thread from loosening, a nut 50 is also screwed to the rod portion 31 of the tool rod 30, and the nut 50 is used to tighten the tool rod 30. Due to the existence of the tool rod 30, the cone head portion 32 of the tool rod 30 provides support for each blade 20, preventing the blade 20 from moving due to the loosening of the screw 40.

[0032] As can be seen from the above, the utility model can make each blade 20 have the same taper through the tool setting rod 30, and the taper of each side edge of the end mill can be adjusted by simply changing the taper of the cone head 32 of the tool setting rod 30. In addition, the cone head 32 of the tool setting rod 30 provides support for each blade 20, which can prevent the blade 20 from moving due to loosening of the screw 40.

[0033] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An end mill with variable taper, comprising a cutter body and a plurality of blades, wherein the cutter body is provided with a plurality of cutting grooves, and the blades are fixed in the cutting grooves by screws, wherein: The handle of the cutter body is provided with a center hole concentric with the cutter body, and a tool setting rod is inserted into the center hole; the head of the tool setting rod has a conical surface, and when the taper of the end mill is adjusted, each blade fits on the conical surface.

2. The variable taper end mill according to claim 1, characterized in that: The blade is in the shape of a long strip and is provided with at least two slotted holes for passing screws.

3. The variable taper end mill according to claim 1, characterized in that: The tool setting rod is composed of a rod portion and a cone head portion which are coaxially connected, and the conical surface is located at the cone head portion.

4. The variable taper end mill according to claim 3, characterized in that: An internal thread is arranged in the center hole, an external thread is arranged on the rod portion of the tool setting rod, and the rod portion of the tool setting rod is screwed with the center hole.

5. The variable taper end mill according to claim 1, characterized in that: The cutting groove is an axial straight cutting groove or an oblique straight cutting groove.

6. The variable taper end mill according to claim 5, characterized in that: The knife body is provided with four or six cutting grooves.

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