CN213764172U

CN213764172U - Taper left-handed milling cutter

Info

Publication number: CN213764172U
Application number: CN202020884014.5U
Authority: CN
Inventors: 魏兆成; 狄纪生; 李忠军; 刘平
Original assignee: Dalian University of Technology; Goertek Inc
Current assignee: Dalian University of Technology; Goertek Inc
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2021-07-23
Anticipated expiration: 2030-05-21

Abstract

The application provides a tapering left-hand milling cutter. The taper left-handed milling cutter comprises a hard alloy milling cutter main body, wherein the side surface of the hard alloy milling cutter main body is provided with at least one left-handed cutting edge, the tool nose of the hard alloy milling cutter main body is provided with a fillet, and the radius of the fillet is 0.2 mm; the range of the helix angle beta of the left-handed cutting edge is 20-60 degrees; the cutter half-cone angle alpha of the hard alloy milling cutter body is configured to be equal to the included angle between the inclined surface and the vertical surface of a preset part; the cutting depth of each time of feeding of the taper left-hand milling cutter is configured to be 0.03mm, the cutting stroke of each time of feeding is configured to be 0.5mm-2mm, and the taper left-hand milling cutter is used for milling a workpiece in a reverse milling mode. The application provides a tapering left-handed milling cutter can reduce the burr that produces during the processing.

Description

Taper left-handed milling cutter

Reference to related applications

This application claims priority from patent application No. 201920742805.1 filed on 2019, 05 and 22.

Technical Field

The application relates to the technical field of machining, in particular to a milling method.

Background

With the rapid development of the related technologies of consumer electronics, the structure of the electronic product tends to be compact, and the fine processing degree of the appearance is improved. The development trend puts higher precision requirements on related dies and processing equipment for processing electronic products, and the processing difficulty of the electronic products is increased. In order to meet the design requirements of products, structures with sharp-angled edge features, such as electrical connection points of copper electrodes, are often required to be designed in relevant molds. These structures featuring sharp edges are often formed by the intersection of two beveled surfaces.

Taking the processing of copper electrodes as an example, because the copper electrode material has good plasticity and the material support property of the sharp-angled edge characteristic is poor, the cutting burrs which fall from left to right are easily generated during milling processing.

In addition, in the 3C industry such as consumer electronics, the tool and the punch used for cutting and processing the product often have an acute-angled edge formed by intersecting two sets of inclined surfaces. Such a tool or punch is very likely to generate cutting burrs during machining. Burrs formed on the cutter and the punch directly influence the quality of a product processed by the cutter and the punch and directly influence the service life of the cutter and the punch.

There is a need for improved processes for manufacturing products having sharp edge configurations to reduce the occurrence of burrs.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to provide a new solution for a milling cutter.

The embodiment of the application provides a taper left-hand milling cutter, which comprises a hard alloy milling cutter main body,

the side surface of the hard alloy milling cutter body is provided with at least one left-handed cutting edge, the tool nose of the hard alloy milling cutter body is provided with a fillet, and the radius of the fillet is 0.2 mm;

the range of the helix angle beta of the left-handed cutting edge is 20-60 degrees;

the cutter half-cone angle alpha of the hard alloy milling cutter body is configured to be equal to the included angle between the inclined surface and the vertical surface of a preset part;

the cutting depth of each time of feeding of the taper left-hand milling cutter is 0.03mm, the cutting stroke of each time of feeding is configured to be 0.5mm-2mm, and the taper left-hand milling cutter is used for milling a workpiece in a reverse milling mode.

Optionally, the tip of the cemented carbide milling cutter body has a secondary rake angle, k, of 5 ° to 20 °.

Optionally, the secondary declination angle k is 15 °.

Optionally, the half cone angle α is 25 °.

Optionally, the helix angle β is 35 °.

Optionally, the tool diameter of the cemented carbide milling cutter body is 4mm, and the tool end face diameter is 1 mm.

Optionally, the tapered left-hand mill is configured for machining a predetermined part having an end face included at an angle relative to a horizontal plane that is less than the helix angle β.

Optionally, the tapered left-hand milling cutter is configured for milling with the tip rotated downward and clockwise.

The taper left-handed milling cutter provided by the embodiment of the application can reduce burrs generated on parts when the workpieces are milled and processed to form preset parts with acute-angle edges.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic structural view of a tapered left-hand milling cutter provided by the present application;

FIG. 2 is a schematic structural view of a tapered left-hand milling cutter provided by the present application;

fig. 3 is a schematic view of a tapered left-hand milling cutter provided by the present application cutting a workpiece.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The application provides a tapering left-handed milling cutter, this application has carried out comprehensive improvement to this tapering left-handed milling cutter's cutting edge, half cone angle, helix angle and fillet radius to make the work piece adopt this tapering left-handed milling cutter to carry out milling process can reduce the production of burr.

As shown in fig. 1 to 3, the taper left-hand milling cutter provided by the application comprises a cemented carbide milling cutter body 1. The side surface of the hard alloy milling cutter body 1 is provided with a left-handed cutting edge 2. The carbide milling cutter body 1 may have one left-handed cutting edge 2 or may have a plurality of left-handed cutting edges 2, for example two or three left-handed cutting edges 2.

In the actual milling process, the right-hand cutting edge is in the form of the cutting edge normally used by milling cutters, and the rotation of the milling machine is also designed in a form adapted to the right-hand cutting edge. The taper left-handed milling cutter with the left-handed cutting edge 2 is applied to a conventional milling machine, due to the characteristics of a rotating mode, the cutting depth of the left-handed cutting edge 2 during milling is reduced, the cutting acting force is reduced, and the risks that burrs are generated on the workpiece 10 and the workpiece is cut and deformed are reduced.

The tip 3 of the cemented carbide milling cutter body 1 has a fillet 4, as shown in fig. 2, with a radius of 0.2 mm. The fillet radius of the tool nose 3 can limit the cutting depth of the taper left-hand milling cutter. The cutting depth of the taper left-hand milling cutter is less than 20% of the radius of the nose 3. In the actual milling process, if the cutting depth of each cutting of the taper left-hand milling cutter is tried to be deepened, the milling depth cannot be further increased due to the limitation of the fillet radius of the nose 3, and the taper left-hand milling cutter cannot realize the deeper milling depth. This application will the fillet radius of knife tip 3 designs into 0.2mm to the effective milling depth of control tapering left-hand milling cutter, thereby avoids the slight deformation of work piece 10 that causes because of the degree of depth of single milling feed is too dark. If the workpiece 10 is repeatedly deformed finely due to the milling cut being too deep during the milling process, burrs are more likely to occur at the machined edges of the workpiece 10. For example, when machining two intersecting bevels, burrs are easily formed at the sharp edges. This application is through inciting somebody to action the fillet radius of knife tip 3 designs into 0.2mm and effectively avoids extrudeing work piece 10 repeatedly and warp, reduces the possibility that produces the burr.

In particular, the present application designs the helix angle β of the left-handed cutting edge 2 to be between 20 ° and 60 °. And the tool half-cone angle alpha of the cemented carbide milling cutter body 1 is designed to be the same as the inclination angle of the bevel to be machined. That is, as shown in fig. 1, the half cone angle α is equal to an angle between the inclined surface and the vertical surface of the predetermined part.

Firstly, the half cone angle alpha is designed to be consistent with the inclination angle of the inclined plane, so that the inclined plane which meets the preset requirement can be directly formed by feeding when the tapered left-hand milling cutter processes the inclined plane of a preset part, and the inclination of the inclined plane is attached to the side surface of the tapered left-hand milling cutter. The design mode can obtain the inclined plane required in advance without repeatedly milling the same area of the inclined plane, and reduces the times of milling, thereby reducing the deformation and the burr which are possibly caused by repeatedly cutting the material of the workpiece. The application provides a tapering left-hand milling cutter can carry out the feed in proper order, and orderly direct formation is predetermined inclined plane.

Second, if the angle of the helix angle β is too large, excessive cutting force is generated between the left-hand blade and the workpiece although the cutting ability is improved. Excessive cutting force also causes excessive deformation of the workpiece material, and burrs are likely to be generated. If the angle of the helix angle β is too small, on the one hand, the cutting ability is weak, and on the other hand, the left-hand edge is liable to rather generate scratches on the workpiece in the feed direction, thereby causing burrs. Such a problem is more likely to occur in the case where the half cone angle α is the same as the slope inclination angle.

For this reason, the helical angle beta is designed to be between 20 degrees and 60 degrees, so that the helical angle beta can form a more reasonable matching relation with the half cone angle alpha, and the possibility of generating burrs in the milling process is effectively reduced.

In addition, with fillet radius design for 0.2mm, can be under the half cone angle alpha design the same with the inclination on inclined plane, the depth of cut of more effectual control tapering left-hand milling cutter to make the cutting of advancing every time on the work piece stroke level and smooth, the angle is proper the inclined plane, the cutting stroke of advancing in proper order is complete, smooth inclined plane, improves cutting quality, prevents the production of burr.

This application combines a plurality of technical characterstic of tapering left-handed milling cutter so that milling cutter can reduce the production of burr on the work piece in the milling process who carries out the inclined plane, improves the processingquality of work piece.

The taper left-hand milling cutter is configured that the cutting depth of each feed is 0.03mm, and the cutting stroke of each feed is configured to be between 0.5mm and 2 mm. And the taper left-hand milling cutter adopts reverse driving to mill the workpiece 10. According to the structural characteristics of the taper left-hand milling cutter provided by the application, the cutting depth and the cutting stroke are controlled in a matched mode, so that the reduction of the cutting quality possibly caused by factors such as the temperature rise of the cutting edge and the fatigue of the cutting edge of the taper left-hand milling cutter is avoided, the quality of the inclined surface milling is further improved, and the generation of burrs is reduced. The left-handed milling cutter is adopted, the reverse milling mode is adopted, the milling performance of the taper left-handed milling cutter can be effectively improved, and materials possibly generating burrs are pushed and extruded in the direction far away from the end face and the edge of the workpiece 10. The application designs depth of cut for 0.03mm and considers the comprehensive factor influence of fillet radius and helix angle beta to improve cutting quality.

Optionally, as shown in fig. 2, the tip 3 of the cemented carbide milling cutter body 1 has a secondary rake angle k of 5 ° to 20 °. By designing the auxiliary deflection angle at the tool nose 3, the risk that the tool nose 3 scratches the workpiece 10 can be reduced. Furthermore, the auxiliary deflection angle k is designed to be 5-20 degrees, so that the auxiliary deflection angle k is matched with the radius of the fillet, the left-handed cutting edge 2 shows a softer curve at the tool nose 3, the cutting force generated when the tool nose 3 of the left-handed cutting edge 2 cuts the workpiece 10 is reduced, and the risks of extrusion and burr generation of the workpiece 10 are reduced. Optionally, the secondary declination angle k is 15 °. The sub-declination angle k of 15 degrees can be better matched with the fillet radius of 0.2mm, and the workpiece 10 is protected.

Optionally, the half cone angle α is 25 °. Designing the half cone angle alpha to be 25 deg. represents that the angle between the inclined plane and the vertical plane of the intended part is also 25 deg.. The inclined plane has high relative vertical degree, is beneficial to milling and forming by adopting the left-handed cutting edge 2 on the side surface of the tapered left-handed milling cutter, has high forming flatness and is not easy to deform.

Optionally, the helix angle β is 35 °. The helix angle beta is designed to be slightly larger than the half cone angle alpha, so that the left-handed cutting edge 2 can better mill the edge of the inclined plane, and the edge of the inclined plane is not scratched or extruded and deformed. By means of the design mode, the risk of defects occurring on the edge of the inclined plane of the preset part is reduced, and the left-handed cutting edge 2 can play a secondary cleaning role in scraping burrs possibly generated on the edge, so that the burrs on the inclined plane edge of the workpiece 10 are reduced.

Optionally, the tool diameter of the cemented carbide milling cutter body 1 is 4mm, and the tool end face diameter is 1 mm. Through designing the cutter diameter and the end face diameter of the hard alloy milling cutter body 1, the taper left-handed milling cutter can be better matched with a set spiral angle, a set fillet radius, a set cutting depth and a set cutting stroke, the left-handed cutting edge 2 is fully utilized to realize milling in a preset cutting stroke and depth range, and the milling yield is improved.

Optionally, the tapered left-hand mill is configured for machining a predetermined part having an end face or end edge with an included angle with respect to a horizontal plane that is less than the helix angle β. If the included angle is larger than the spiral angle beta, the left-handed cutting edge 2 is easy to extrude and collide on the end surface of the workpiece 10 and the edge of the end surface, so that the processing precision of the end surface and the edge is affected. The included angle is designed to be smaller than the spiral angle beta, so that the processing precision of the end face and the edge can be improved.

The milling cutter, when rotated, generates a force along the axis of the carbide milling cutter body 1 on the material of the workpiece 10. Optionally, the taper left-hand milling cutter is configured for milling with the nose 3 rotated downward and clockwise. As shown in fig. 1-3. Because the left-handed cutting edge 2 has the left-handed characteristic, under the condition that the taper left-handed milling cutter provided by the application adopts the machining mode, the left-handed cutting edge 2 can apply an acting force which is downward along the axial direction to the material of the workpiece 10. That is, the cutting force generated by the rotation of the left-handed blade pushes the material away from the edge. Therefore, the cut material scraps are pushed and moved in the direction away from the end face and the edge of the workpiece 10 under the pushing action of the left-hand milling cutter, so that the formation of burrs at the edge of the workpiece 10 is further avoided.

Combine this application to fillet radius, helix angle beta's design mode, configure tapering left-handed milling cutter into clockwise rotation and mill, even the left-handed cutting edge still can produce certain extrusion, protruding influence to the work piece, utilize the characteristics of cutting direction also can make by extruded material avoid to removing to edge department, reduce the risk that the material piles up, the fluff thorn. Furthermore, the half cone angle alpha is designed to be consistent with the inclination angle of the inclined plane of the preset part, so that the inclined plane and the edge machined on the workpiece are not easy to be subjected to the pushing action force of the taper left-handed milling cutter on the material, and the risk of generating burrs at the edge is comprehensively reduced.

Although some specific embodiments of the present application have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A taper left-hand milling cutter is characterized by comprising a hard alloy milling cutter main body,

the side surface of the hard alloy milling cutter body is provided with three left-handed cutting edges, the tool nose of the hard alloy milling cutter body is provided with a fillet, and the radius of the fillet is 0.2 mm;

the taper left-hand milling cutter is configured to have a cutting depth of 0.03mm and a cutting stroke of 0.5-2 mm in each feed, and is used for milling a workpiece in a reverse milling mode;

the taper left-handed milling cutter is configured for milling in a mode that a tool nose rotates downwards and clockwise, and is used for processing a predetermined part of which the included angle of an end face relative to a horizontal plane is smaller than the helical angle beta;

the tool nose of the hard alloy milling cutter body is provided with an auxiliary deflection angle, and the auxiliary deflection angle k is 15 degrees.

2. The tapered left-hand milling cutter according to claim 1, wherein the half-cone angle α is 25 °.

3. The tapered left-hand milling cutter according to claim 2, wherein the helix angle β is 35 °.

4. The tapered left-hand milling cutter according to claim 1, wherein the carbide milling cutter body has a cutter diameter of 4mm and a cutter end face diameter of 1 mm.