JPS5848287B2 - Assembly type roughing cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, the present invention is an improvement of a so-called roughing cutter for rough machining, in which a cutter blade 1 of a prefabricated end mill is provided with a mark 2 in the form of a mark (hereinafter referred to as a mark). Regarding.

The number of rotations of the tool required to cut a flat surface for one pitch of the cutting blade in the axial direction in a roughing force vine with the cutting blade 1 and the main body 3 integrated and having N strips is 1/KN, and K is (-1). When it is in the range of 1 to 1, the nick that crosses the second cutting edge is formed by normal thread cutting of (N-K) threads, and the second side corner of the main cutting corner of the cutting blade that cuts the uncut portion of the nick is correct. A roughing ivy that forms corners is shown in Japanese Patent Publication No. 31312/1983.

Then, the number of grooves N and the constant K1 the number of grooves n-(NK)
It is also shown that the relationship is as shown in Table 1.

Here, the relationship between the number of blades N1, the constant K1, and the number of knit threads n1 is expressed as the fifth
To explain with reference to the developed diagrams of Fig. 6 and Fig. 6, Fig. 5 shows N
It is a developed view showing a state in which the condition of K=2 is given to the six blades, that is, the condition of K=2 is provided.

The number of nicks n means that n nicks are included between the three leads L provided in a screw shape, and the diagonally shaded part is the cutting edge 2 formed by being surrounded by the blade groove 5 and the nick 4. , Ema shows the cutting edge of the rake face.

The number of holes is n-(N-K), that is, n=(6-2), and the number of holes is n-(N-K).
) is formed.

π・D represents the developed length for one rotation of the tool, and in order to cut the width of the axial pitch Pa, πD/2, that is, the tool rotates 17K=1/2, Pa
This shows that it is possible to cut the width of .

The main cutting corner a, which cuts the uncut portion between the preceding cutting edges, is partially indicated by a thick line in the figure, and the nick entry angle α acts as a positive lateral relief angle at this corner. It shows that.

FIG. 6 shows a state in which the tool with N=6 is provided with nicks under the condition of K=1, similar to the previous figure.

In this case, it can be seen that 1/K=1, that is, one rotation of the tool cuts a width equivalent to the gap pitch (Pa).

The number of nicks at this time is n-6-1, that is, the nicks are processed with 5 nicks.

In this case as well, the lateral relief angle α of the main cutting corner that cuts off the uncut portion of the leading edge is the cutting angle itself, and can be provided as a positive relief angle.

Only under the limited conditions of N and n1 or K as shown in Table 1, the side relief angle of the main cutting corner can always be a positive angle, and it is possible to make the side relief angle of the main cutting corner always positive, and it is possible to make the side relief angle of the main cutting corner always a positive angle. Even without machining, the holes can be efficiently provided by ordinary multi-thread thread machining.

Although Table 1 only shows combinations up to N-12, it goes without saying that n can be expanded in a series to find combinations up to N=■.

This cutter has a blade part and a main body that are integrated, and a hole is machined on the cutting edge of the main body.As shown in Figure 2, the hole is usually processed by thread cutting, but the helical screw hole is The advance angle (β) directly acts as the sideward angle α of the main cutting corner (the cutting edge that cuts the uncut portion of the previous blade).

Assuming that the diameter of the tool is the pitch of the nicks in the direction of the D1 axis as Pa, and the number of nicks is n = (NK), the lateral deflection angle α of the main cutting corner is, however, this lateral deflection angle α is The pitch of P1 is determined by the diameter D of the tool, and to obtain an arbitrary lateral angle, P
I couldn't get it without changing.

The present invention provides an assembly type roughing cutter with fixed conditions of n, P, and D, which allows the main cutting corner lateral angle α of the assembled cutter to be set to an arbitrary angle. This invention relates to the improvement of the lateral bending angle of Japanese ivy.

To explain the present invention by way of an example, an assembled roughing force vine is manufactured having an assembled outer diameter (g), an axial pitch (Pa) of the number of teeth N1, and a desired lateral deflection angle α of the main cutting corner. First, as shown in FIG. 3, N number of cutting blades to be implanted (four blades are used in the embodiment) are arranged in a flat state in a flat state, and each cutting blade 21, 22. 23.24
．． Although each circumferential pitch is πD/N after assembly, the blades are arranged at a pitch of S/N on the jig during Nikku machining, resulting in n-(N-K) strips. Nick machining is performed on the plane of the jig.

Here, S represents a development width, which is determined so as to obtain a desired lateral clearance angle, which will be described later.

For example, in the case of a one-piece tool with diameter D, is there a side relief provided at the main cutting corner by machining? n-Pa) as D.
n. Depending on Pa or L, only a certain α can be obtained.

However, in the assembled type roughing cutter according to the method of the present invention, the development width on the cutting jig is temporarily set to S=
By arranging the blades so that 2πD1 or S = 3πD and machining the three twigs, and then attaching them so that the outer diameter after assembling the main body is D, the value of tanα can be reduced to 1/ It can be reduced to 2 or 1/3.

(It goes without saying that it is possible to increase the value of tanα depending on how S is taken.) The Nikku machining method is to change πD to S on the Nikku machining jig, place it on a flat surface, and reciprocate. It can be processed by surface grinding, or it can be processed by screw grinding using a cylindrical mounting jig whose outer circumference length is S.

At this time, it is advisable to stop the nick machining at arrows A, C, and 2 so that incompletely formed portions of the nick will not remain near the bottom cutting edge after assembly.

As a result, the shaded portions remain as blades, and the cutting edges surrounded by the constant nicks 4 and grooves 5 become mouths a, b, c, and d.

The dotted line 6 is an imaginary line indicating the arrangement of the marks for the purpose of explanation and does not actually exist.

Note that θ is the groove, and the helix angle L is the pitch of the pitch during one rotation of the tool.

Assuming that the unfolded width (S) and the desired lateral deflection n°Pa angle α after assembly are α = jan −1, if α is the desired angle S degrees, then if you choose S that satisfies, then α can be any angle. is obtained.

Next, the cutting blades 21, 2 processed in this way...
・When 2n is assembled into a main body of diameter D as shown in Fig. 4, the rake face ridge line n of the cutting edge is formed by two grinding of n-(NK) strips, so
It is possible to easily obtain a prefabricated roughing cutter that possesses all the functions and characteristics of the cutter, and has an arbitrary lateral deflection angle α of the main cutting corner, regardless of the helical angle β of the rake face ridgeline. can.

The assembled blade 1 is generally a disposable blade, and is made of high-grade high-speed steel or cemented carbide. Making it smaller is more effective in terms of cutting edge strength.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a roughing cutter according to the present invention, Fig. 2 is a perspective view of a roughing cutter according to the present invention;
The figure is a developed view of the cutting blade arrangement of a conventional roughing cutter.
The figure is an explanatory diagram showing a method of forming a roughing cutter according to the present invention, FIG. 4 is a developed view of the cutting blade arrangement of the roughing cutter according to the present invention, and FIGS. 5 and 6 show the number of blades N1 constant K1 FIG. 3 is a developed explanatory diagram showing the relationship between the number of threads n. 1... Cutting blade, 2... Nikku, 3...
...Main body, 4...Nick, 5...Groove, α...Side angle.

Claims (1)

[Scope of Claims] 1. In an assembled type implanted roughing cutter whose outer diameter after assembly is D1, the number of grooves, that is, the number of teeth, N1, and the axial pitch Pa of the cutting blade, the machined surface corresponding to the axial pitch Pa. The number of rotations N of the tool required to cut the width is 1/K rotation, where K is in the range of (1-1) to 1, and the number of threads n across the cutting edge is (N-K).
When the desired lateral relief angle of the main cutting corner that cuts off the uncut portion of the preceding cutting edge is α, a developed width S is given on a jig separate from the main body, and N number of cutting edges are spread out in the developed width. Two strips of n strips are arranged at equal intervals in S. After machining and satisfying α-tan-1・, the arrangement of the rake face of the cutting edge between the main body S after assembly is n (N-K).
A prefabricated roughing force vine, in which the cutting blade is embedded in the groove of the main body so as to maintain the relationship between the rows.