JPS61293730A - Cutting tool and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION With respect to this type of cutting tool, the finishing of the anvil cylinder is easier than the finishing of the cutting cylinder. This is because the latter requires grooves to be cut on the surface of the cylinder. This finishing is time consuming and can be done with a single milling cutter without the need for electrolytic etching. As far as the finishing of the cutting cylinder is concerned, it is quite different since this cylinder must be provided with striations and no grooves. This all means that a large amount of material is removed from the surface of the cylinder and takes time. Furthermore, the intersection points of the filaments cannot be finished with sufficient precision and must be manually corrected when the milling tool is to produce a given diameter. The technique chosen is therefore galvanic erosion, which ensures that accurate angles are obtained at the intersections of the filaments. In any case 2
In one way, the mechanical properties are made identical to those of the material chosen for the central body of the cylinder.

The present invention significantly reduces the time required to finish cutting tools,
Furthermore, an attempt is made to solve the above-mentioned problems by a method that can change the mechanical properties of the filament in any way.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway view of the first cutting tool;
More specifically, only a cutting tool 3 machined by galvanic corrosion with a metal cylinder 1 is shown in this figure. Fifth
A large number of filaments 2 are provided on the circumferential surface of the illustrated cutting tool 6. These striations are cut striations or fold striations. These filaments 2 are arranged like a mesh network, each of which has the shape of the partition blank 5 to be cut. Only one of the cutting lines 2 is shown to simplify the drawing. The cutting tool is obtained by etching away all the material along the filament 2. The volume of material removed by galvanic erosion or milling is calculated as follows.

V = Vcour - Vd - Vr V (!Our is the total volume of the rim material finishing the striations, V
a is the total volume of material in the cut striations and Vr is the total volume of material in the creasing striations. VC! The calculation formula for Our is π Vcour=--L-(a2-(a-2h)) where L is the length of the cylinder, d is the outer diameter, and h is the height of the filament. The total volume of material required for the cutting line V,1 in the configuration of FIG. 7 is calculated by the following formula.

Va Snow Sa -La In this formula, Sd is the cross section of the cutting tool 10 (Fig. 3),
La is the total length of the cutting tool, and the plan view of the partition material 5 to be cut drawn by the circumferential surface of the cutting tool is the three frames on the length L of the cylinder and the circumference of the cylinder (Figs. 6 and 7). ) shows the four partitions above. This allows the calculation of La in the following equation, ie the summation of the 12 partitions in one embodiment.

-9(2A+2B)-sH This formula can be simplified as shown below.

Ld day 30 (A+5B) +8 (3F+2H)S
d is the cross section of the cut line (Fig. 3) and is calculated by the following formula.

Therefore, the final formula for calculating the total volume of the cutting striations is B, and the total volume of the material given by the creasing striations (Vr) in one embodiment is limited by the following formula:

VrSr-Lr Sr is the cross-section of the filament, and I-r is the total length of the filament. The cross section Sr of the filament 11 (FIG. 4) is calculated by the following formula.

TR+PR 3rwa□・HR Referring to FIG. 6, the total length Lr of the creases is calculated by the following formula.

Lr-12(2(2A+2B)+4H) This equation is simplified as follows.

Lr-48(A+B+H) Therefore, the total volume .rho.r is as follows.These calculations give the formula required to calculate the total volume V of material to be removed. That is, 4 t(
48(A+B+H) ] In one embodiment, the values of various parameters are limited so that subsequent comparisons can be made between materials corroded under different finishing conditions.

The value for Seiran is d-301,76mm Pr-1,538mmh-
1mm A=116.5trsL=100
0m B-42+m TD-0,03wm H-153mmPD-0,
858m P=13wnTR-0,71According to the formula, the total corroded volume V is therefore 922487m
3, that is, ldm3.

FIG. 2 is a partially cutaway view of a second cutting tool 6 made of a metal cylinder 7 having a diameter ax t" suitable for single-piece operation.

The circumferential surface of this cylinder is covered with strips 8 having different material properties by means of known material application methods in a single operation. These properties are chosen with respect to the work done by the cutting tool. The strips are readily available under the registered trademark “Nitroloy” (
It may also be a micronized alloy available under the name Eu TroLoy and manufactured by Castolin Co.
The attachment is carried out by the EuTronic Gap method held by Mpany. This attachment work is performed on the entire area with the crease line or cutting line 9 based on the developed view shown in Figure 7. The cross section of the strip 8 is a circular arc with a radius R1 and an angle α.

Since the diameter dl is very large compared to the radius R, the chord of the arc is considered to be almost a straight line to simplify the calculation of the total volume of the attachment strip 8.a The value measured after the attachment operation is the chord of the arc a and arrow f.

Therefore, the arc surface is calculated as follows.

R is the radius of the imaginary circle containing strip 8, l fII and Iaw are the measurements of the arrow and bowstring. If α is the angle of the arc, then the angle is the following minor.

α・−2・8in″″1·2″− The total volume vmat to be expressed is determined by the following formula t.

+8.(3P+2H)+48(A+B+H), 1 In this example, a=5m, fx2■.

Therefore, R is 3.25+++m and α is 134.76°.

As a result, the total volume of strips to be attached is 238.485 cubic meters.

The last applied strip must be machined with respect to the desired filament.

Therefore, the known volume of the strip ver must be removed based on the equation:

VerIll+Vmat-Vr-V (1vr and Va have already been calculated in the previous example, so Ver is 2
38.485-16.806-5.574 Tomi 216.1
It is between 05 and 05. This means that for the same cutting tool, the second solution requires much less strip removal than the first method.

If we consider only the time required for finishing in both examples, and find that the time required for corrosion is proportional to the strip to be removed, we obtain:

η is the ratio between the 20 volumes corroded. The time gain for the finishing operation is therefore G-100-η-100-23.43-76.57% This time gain of course reduces the finishing cost.

The cutting tool 10 shown in the third figure has a trapezoidal cross section.

PD refers to the large base, TD refers to the small base, and H refers to the height.

FIG. 4 also shows a folded filament 11 with a trapezoidal cross-section. PRn big base, TR is small base and H
R indicates the entire height of the trapezoid.

FIG. 5 is a perspective view of the cutting tool, illustrating the general configuration of the cutting tool with a value and dl, i.e. length and diameter of the cutting tool (see FIGS. 1 and 2).

FIG. 6 is a plan view of the partition element 5, whose shape is that of the cutting tool IO.
is shown by a perfect straight line corresponding to . This makes it possible to select the characteristics of the strip used for the wire in relation to the work to be done. A full range of inexpensive cutting tools are available to the user that are well suited to the strip requirements encountered in processing.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway view of the first cutting tool, Fig. 2 is a partially cutaway view of the second cutting tool, Fig. 3 is a cutaway view of the cutting line;
Figure 4 is a broken view of the filament with creases, Figure 5 is a perspective view of the cutting tool, and Figure 6 is a plan view of the circumferential surface of the cutting tool.
Color 11 people to A (2) 2''&k・(5 people outside) FjG, 1

Claims (1)

[Claims] 1. A method for manufacturing a cutting tool for sheet materials, etc., comprising: a strip 8;
on the circumferential surface of the metal cylinder in the form of a network, the mesh of the network having the shape of the substrate to be cut, the strip 8 thus finishing and machining the circumference of the metal cylinder. A method for manufacturing a cutting tool characterized by carefully avoiding surfaces. 2. The method of manufacturing a cutting tool according to claim 1, wherein the strips 8 are laid down by fine spraying in one single operation and finished by electrolytic corrosion using a plane graphite electrode. 3. In the first manufacturing process, the metal cylinder 7 appears,
A cutting tool according to claim 1, characterized in that its surface is covered with a network of strips and its cross section is an arc. 4. In the second and final step, a metal cylinder 7 appears, the surface of which is provided with cutting lines 10 and creasing lines 11 finished in strips 8 A cutting tool according to claim 3. 5. Cutting tool according to claim 3, characterized in that the mechanical properties of the strip are different from those of the metal cylinder. 6. Cutting tool according to claim 5, characterized in that the strip is made of a metal alloy applied by fine spraying.