JPS6133813A - Cutting method for hollow raw material with small elongation rate - Google Patents

Abstract

PURPOSE:To cut a hollow raw material with small elongation rate in good yield percentage, by turning said hollow raw material to cut V grooves of proper depth on inner/outer peripheral faces respectively at the cutting position thereof and making breaking cut thereon by means of a plastic cutting tool forced in press-contact with one of those grooves. CONSTITUTION:A hollow raw material 2 is turned, and a maching head 3 is advanced so as to cut and machine the outer diameter 11 and the inner diameter 12 by means of a cutting tool 4 and a cutting tool 5 respectively, and after the inner/outer diameter are cut and machined in proscribled sizes, a cutting tool 6 touches the end face of the raw material 2 so as to make cutting process on inner/outer diameter 11, 12 and end face 13 simultaneously. V grooves 15, 16 are formed with the prescribed depth on outer/ inner peripheries of raw material 12 by means of cutting tools 4, 5 respectively. A disk- shaped cutter 7 is pressed on the V groove 15 to make cut in. On the way of cut-in process, the raw material 2 is broken to separate a ring-shaped machined raw material 31. The direction of break is always constant toward the bottom of V groove 16, thus uneven length of raw material 31 being avoided in parallel with improved yield rate of the raw material.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to cutting a hollow material with a low elongation rate such as brass, gunmetal, or aluminum to obtain a ring-shaped processed material, such as a billet for forging. The present invention relates to a suitable cutting method used in the present invention.

(Conventional technology) When cutting a hollow material to obtain a ring-shaped processed material,
In order to reduce chips as much as possible and improve material yield, it is desirable to cut with a plastic cutting tool such as a disc cutter.

(Problem to be solved by the invention) However, if the elongation rate of the hollow material is low (for example, elongation rate of 10% or less), breakage will occur during cutting, and the direction of such breakage will not be constant, so that the hollow material The length of the ring-shaped processed material obtained from the shaped material varies, and it is necessary to deeply remove the fractured surface by cutting after cutting.

Therefore, in the past, hollow materials were cut using circular saws, cut-off bits, etc., but the yield of cutting materials that turned into chips was poor.

The present invention has been devised in view of the above circumstances, and one object of the present invention is to uniformly cut a hollow material with a low elongation rate using a plastic cutting tool. An object of the present invention is to provide a cutting method that can improve material yield.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention rotates a hollow material, and the inner circumferential surface and outer circumferential surface of the hollow material at the cutting position are each given an appropriate depth of about V. The present invention is characterized in that a shaped groove is cut, and then a plastic cutting tool is pressed into one of the grooves on the inner circumferential surface or the outer circumferential surface to perform a fracture cut.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a sectional side view of a main part of an apparatus for explaining the method of the present invention.

(1) is a chuck, (2) is a hollow material, (3) is a
The processing head (3) has a cutting tool (4) for cutting the outer diameter and V-groove of the hollow material (2), a cutting tool (5) for cutting the inner diameter and the groove, and an end face. A cutting tool (6) for cutting is attached. The machining head (3) is provided on a slide base (not shown) that is movable in the axial direction of the chuck (1) and in the direction orthogonal to the axial center, and the V-shaped core (
A disc type cutter (7) is attached with the blade core (7a) aligned with 4a). Cutting tool for internal cutting (
5) is an angular deviation (e) of the disc type cutter (7) toward the end face side of the hollow material (2) with respect to the cutting tool (4) that performs outer diameter cutting.

Using the device described below, first, a chuck (1) supports a hollow material (2) and rotates the hollow material (2).

Next, the processing head (3) is advanced toward the hollow material (2) by the slide base, and the cutting tool (4) is used to
), the inner diameter (!2) is cut with a cutting tool (5), and the inner and outer diameters are cut to a predetermined length.
) is in contact with the end surface of the hollow material (2), and the inner and outer diameters (11)
, (12) cutting and end face (13) cutting are performed simultaneously.

Next, after the processing head (3) moves forward a predetermined distance, the processing head (3) is moved in the radial direction of the hollow material (2) by the slide head, and the hollow material (2) is cut by the cutting tool (4).
), and a groove (16) is cut to a predetermined depth on the inner circumference using the cutting tool (5). At the same time, the cutting tool (8) is also moved in the radial direction to cut the end surface ( Finish 13). Through this cutting process, the V-groove center (18a
) is the end face (13
) is formed with a deviation (e) towards the side.

Next, as shown in an enlarged view in FIG. 2, a disc cutter (7) is pressed against the V-groove (15) to make a cut (21). In the middle of this cut, the hollow material (2) breaks (22
) occurs, and the ring-shaped processed material (31) is separated from the hollow material (2) by the cut (21) and the breakage (22), thereby obtaining a ring-shaped processed material (31).

Figure 3 shows a cross-sectional side view of the ring-shaped processed material (3).
The ring-shaped processed material (3■) has inner and outer peripheral parts (II) and (12) cut to a predetermined diameter using cutting tools (4) and (5).
and an end face (13) cut by a cutting tool (6),
An end face (13a) having a fracture surface (22), and a husband//V
Groove (15).

Chamfering (32) by (16): (33), (34),
(35) (0.7c in the example) is formed.

In the above, since the groove (16) was previously formed on the inner circumference, when cutting with the disc cutter (7), the direction of the breakage (22) that occurs midway through the cut is the direction of the V-groove bottom (IEl
b) The ring-shaped processed material (
31) can be prevented from becoming uneven in length, and a ring-shaped processed material (31) of a constant length can be obtained.

In addition, in the example, since the V-groove center (18a) on the inner circumference was deviated (e) toward the ring-shaped processed material (31) to be cut away from the V-groove center (15a) on the outer circumference, the ring-shaped The fracture surface on the workpiece (31) side can always be formed in a concave shape, and the fracture surface on the chuck (1) side can always be formed in a convex shape. Therefore, depending on the specifications of the ring-shaped workpiece C31), the chuck (1) 11 can be formed in the same process as cutting. The fractured surface of the hollow material (2) left behind can be cut.

In addition, during plastic cutting with the disc type cutter (7), the disc type cutter (7) can be made to follow the V-groove (15), so that the disc type cutter (7) can be used as a cutter when cutting. Even if there is movement toward the ring-shaped workpiece (31) by an angle, the accuracy of the length of the ring-shaped workpiece (31) can be stabilized.

Furthermore, when plastic cutting is performed using the disc type cutter (7), the meat can be released within the V-groove (15), thereby preventing the outer diameter from bulging during cutting.

FIG. 4 shows a cross-sectional side view of a blocking ring (41) used in an automobile transmission formed by forging from a ring-shaped processed material (31), and (42) in the figure shows the machining allowance. If there is a fracture surface on the lower surface (31a) of the ring-shaped processed material (31), it will remain as a crack, but even if there is a fracture surface (22) on the upper surface (31b), the crack caused by the fracture surface (22) will not be removed. It can be removed by processing, and therefore, this embodiment is optimal when forming a billet for the blocking ring (41).

(Effects of the Invention) As is clear from the above explanation, according to the present invention, a hollow material with a low elongation rate can be uniformly cut to the same length using a plastic cutting tool, and the material yield during cutting can be improved. be able to.

[Brief explanation of drawings]

Fig. 1 is a sectional side view of the main part of the device for explaining the method of the present invention, Fig. 2 is an enlarged sectional view of a hollow material when cutting with a disc cutter, and Fig. 3 is a sectional side view of a ring-shaped material. FIG. 4 is a cross-sectional side view of a blocking ring obtained from a ring-shaped processed material. In the drawings, (1) is the chuck, (2) is the hollow material, and (3) is the chuck.
) is a processing head, (4), (5), and (8) are cutting tools, (7) is a disc type cutter, (15) and (1B) are V-grooves, and (31) is a ring-shaped processing material.

Claims (2)

[Claims] (1) Rotate a hollow material with a low elongation rate, cut a roughly V-shaped groove of an appropriate depth on each of the inner peripheral surface and outer peripheral surface at the cutting position of the hollow material, then cut the inner peripheral surface or outer peripheral surface. A method for cutting a hollow material with a low elongation rate, characterized in that a plastic cutting tool is pressed into one of the grooves of the surface to perform fracture cutting. (2) The groove cut on the inner circumferential surface and the groove cut on the outer circumferential surface are hollow materials having a low elongation rate according to claim 1, wherein the grooves cut on the inner circumferential surface and the grooves cut on the outer circumferential surface are offset in the longitudinal direction of the hollow material. How to cut shaped materials.