CN101890529B - Step mill cutter - Google Patents

Abstract

The invention discloses a stepped milling cutter, which includes a handle and a cutter body. The cutter body is provided with a stepped edge and a chamfering edge. The cutter body is provided with a spiral groove and an inclined groove. The spiral groove and the inclined The grooves intersect; the step edge is a helical edge on the groove wall of the spiral groove, and the chamfering edge is a straight edge on the groove wall of the chute. The above-mentioned step milling cutter has provided a spiral groove and an inclined groove on the cutter body to form a spiral cutting edge as a step edge of the step milling cutter and a straight cutting edge as a chamfering edge of the step milling cutter; the spiral cutting edge is more straight than the straight cutting edge. In other words, the cut-in and cut-out of the cutting edge are gradual, which ensures the stability of cutting, increases the actual working rake angle of the cutting edge, and effectively improves the machining accuracy and surface quality of the workpiece.

Description

A step milling cutter

technical field

The invention relates to a milling cutter, in particular to a step milling cutter. the

Background technique

At present, PMMA (methyl methacrylate) and PC (polycarbonate) materials are widely used in the optical screen part of the window of digital products. The raw material of this material is a large-size board, which is milled to meet various sizes that meet the design requirements of digital products. In order to meet the assembly requirements, this kind of products need to process the chamfer β at the same time when processing the edge, as shown in Figure 1. The usual processing tool and processing method, as shown in Figure 2 and Figure 3, remove half of the material at the top of the cutter body 100, and process the remaining half of the material to form a flat edge, that is, a stepped edge for cutting a straight line The chamfering edge and the chamfering edge of the cutting chamfering section are in the same plane, so in the actual cutting process, the cutting edges of the two sections of the cutting edge are cut at the same time, and the radial component of the cutting force is the largest, which affects the cutting stability, precision and surface quality. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a stepped milling cutter which makes the cutting process stable and improves the processing quality. the

The purpose of the present invention is achieved by the following technical solutions:

A stepped milling cutter, comprising a handle and a cutter body, the cutter body is provided with a stepped edge and a chamfering edge, the cutter body is provided with a spiral groove and an inclined groove, and the spiral groove intersects with the inclined groove; The step edge is a spiral edge on the wall of the spiral groove, and the chamfering edge is a straight edge on the wall of the chute. the

The above-mentioned step milling cutter has provided a spiral groove and an inclined groove on the cutter body to form a spiral cutting edge as a step edge of the step milling cutter and a straight cutting edge as a chamfering edge of the step milling cutter; the spiral cutting edge is more straight than the straight cutting edge. In other words, the cut-in and cut-out of the cutting edge are gradual, which ensures the stability of cutting, increases the actual working rake angle of the cutting edge, and effectively improves the machining accuracy and surface quality of the workpiece; the spiral groove and the inclined groove are intersecting energy To ensure smooth chip removal during cutting, in summary, the stepped milling cutter not only has the advantages of the spiral edge cutter but also solves the problem of the shape of the edge at the chamfer. the

Description of drawings

Fig. 1 is a schematic diagram of workpiece processing;

Fig. 2 is a perspective view of a traditional step milling cutter;

Fig. 3 is the cutting diagram of traditional step milling cutter;

Fig. 4 is the perspective view of step milling cutter of the present invention;

Fig. 5 is the front view of step milling cutter of the present invention;

Fig. 6 is the left view of step milling cutter of the present invention;

Fig. 7 is a plan view of the step milling cutter of the present invention. the

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. the

The present invention includes a knife handle and a knife body 200. As shown in FIG. The groove 210 intersects with the chute 220 , the stepped edge 211 is a helical edge on the groove wall of the helical groove 210 ; the chamfering edge 221 is a straight edge on the groove wall of the chute 220 . the

In this embodiment, the helical groove 210 and the inclined groove 220 are provided on the cutter body 200 to form the stepped edge 211 of the spiral cutting edge and the chamfering edge 221 of the straight cutting edge on the cutter body 200 . Compared with the straight blade, the spiral blade 211 has a blade inclination angle, which makes the cutting force of the cutting edge decompose from the complete radial force into the synthesis of radial force and axial force, and the cutting in and out of the cutting edge is gradual. It overcomes the deficiencies of vibration, precision, and poor surface quality of the machined surface caused by the large radial cutting force during the cutting process of the plane edge milling cutter, ensures the stability of the cutting, and also increases the actual working rake angle of the cutting edge. Effectively improve the machining accuracy and surface quality of the workpiece. The spiral groove 210 and the inclined groove 220 intersect, that is, the stepped edge 211 and the chamfered edge 221 are located on the same side, and the same side is designed to ensure smooth chip removal during cutting. As mentioned above, the invented tool not only has the advantages of the spiral edge tool but also solves the problem of the shape of the cutting edge at the chamfer, so that the cutting process is stable, and the precision and surface quality of the processed product parts are guaranteed. the

及阶梯刃211刃长L1的控制，实现了产品加工中阶梯刃211刃口的制作；通过磨削倒角刃221后角α3，实现了产品加工中倒角刃221刃口的制作。  During production, the cutting edge of the tool step edge 211 is formed by a single spiral groove 210 processed by grinding wheel grinding. This process ensures that the cutting edge of the tool step edge 211 is a spiral edge, that is, the helix angle of the step edge 211 is formed as shown in FIG. 7 ω, the rake angle γ of the stepped edge 211 (see FIG. 6 ). However, due to the difference in the outer diameters of the edge of the stepped edge 211 and the edge of the chamfering edge 221, only one spiral groove 210 will cause the edge of the edge of the chamfering edge 221 to be not straight due to the change of the outer diameter, thereby affecting the dimensional accuracy of the processed product . In order to solve this contradiction, the inclined groove 220 is ground at the chamfering edge 221, that is, the bevel angle θ of the chamfering edge 221 and the edge length L1 of the stepped edge 211 are guaranteed in Fig. 7. This process ensures that the chamfering edge 221 of the tool is straight edge. After the helix angle ω of the stepped edge 211, the rake angle γ of the stepped edge 211, the bevel angle θ of the chamfered edge 221, and the edge length L1 of the stepped edge 211 are completed, the main relief angle α1 and the secondary relief angle of the stepped edge 211 are ground. α2, finished stepped edge 211 outer diameter

And the control of the edge length L1 of the stepped edge 211 realizes the production of the edge of the stepped edge 211 in product processing; by grinding the relief angle α3 of the chamfered edge 221, the production of the edge of the chamfered edge 221 in product processing is realized.

As a preference, the parameter ranges of the stepped edge 211 (helical edge) and the chamfering edge 221 (straight edge) are given below:

The helix angle ω of the stepped edge 211 ranges from 3° to 15°. the

The rake angle γ of the stepped edge 211 ranges from 5° to 20°. the

The main relief angle α1 of the stepped edge 211 ranges from 8° to 15°. the

The range of the back angle α2 of the stepped edge 211 is: 16°˜30°. the

The bevel angle θ of the chamfering edge 221 ranges from 30° to 60°. the

The range of the relief angle α3 of the chamfering edge 221 is: 8°˜15°. the

The above only expresses several embodiments of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. the

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention. the

Claims (8)

1. A step milling cutter, comprising a handle and a cutter body, the cutter body is provided with a step edge and a chamfering edge, it is characterized in that, the described cutter body offers a helical groove and an inclined groove, the helical groove and the The chute intersects; the step edge is a helical edge on the wall of the helical groove, and the chamfering edge is a straight edge on the wall of the chute. 2 . The step milling cutter according to claim 1 , wherein the helix angle of the helical blade ranges from 3° to 15°. 3. The step milling cutter according to claim 1, characterized in that, the rake angle of the helical blade ranges from 5° to 20°. 4. The step milling cutter according to claim 1, characterized in that, the main relief angle of the helical blade ranges from 8° to 15°. 5. The step milling cutter according to claim 1, characterized in that, the secondary relief angle of the helical cutting edge ranges from 16° to 30°. 6. The step milling cutter according to claim 1, characterized in that, the bevel angle of the chamfering edge ranges from 30° to 60°. 7. The step milling cutter according to claim 1, characterized in that, the range of the chamfering edge relief angle is 8°-15°. 8. The step milling cutter according to claim 1, characterized in that, the cutter body is a cemented carbide cutter body. the

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