JPS60141315A - Working method of long columnar body - Google Patents

Abstract

PURPOSE:To make an installation small in size and to speed up a titled work by forming a pass which becomes narrower while undulating in bellows shape in the inner surface of an annular tool and working a long columnar body inserted in the tool into a spiral shape while moving the body relatively to the tool. CONSTITUTION:A pipe 7 with a mandrel 6 inserted therein is penetrated into an eccentric ring roll 4 by a propelling device 14, and the working face of the caliber D2 of roll 4 is forcibly inserted onto the outer circumference of pipe 7 by supporting the pipe 7 by the calibers D1, D3 of supporting ring rolls 3, 5. At that time, when the caliber D2 of roll 4 is eccentrically rotated through the inner face 13 of a gear 9 supported by a housing 11, a part plastically press-deformed by the caliber D2 advances while moving in the circumferential direction of pipe 7, and the wall thickness of the whole circumference of pipe 7 is press-reduced into a spiral shape. In this way, the plastic working of a pipe is efficiently performed, and the size reduction of an installation and the speed up working are achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for processing long columns such as pipes or rods (hereinafter referred to as pipe rods).

(Prior Art) Tubes and rods have conventionally been manufactured by plastic working methods such as rolling, extrusion, drawing, or forging.

Technological progress has already reached its limits, and innovative processing techniques are eagerly awaited. For example, rolling of pipes is disclosed in Japanese Patent Publication No. 42-9260.

(Objective of the Invention) The purpose of the present invention is to miniaturize equipment and improve processing speed by improving processing efficiency.

Regarding this, one inventor has already filed a patent application in 1983-580.
No. 5, Japanese Patent Application No. 58-7385 is proposed.

(Structure of the Invention) In the method for machining a long columnar body of the present invention, the inner surface of the ring-shaped tool forms a narrow path while undulating in the direction of movement of the long columnar body, and the tool is inserted into the ring-shaped tool. By the relative movement with the long columnar body, the long columnar body is processed into a spiral shape.

(Example) To explain the present invention in detail using the example of a pipe, FIG. 1 is a side view of an apparatus illustrating an embodiment of the present invention. Support ring rolls 3 and 5 are provided as support devices, and a tube 7 into which a mandrel 6 is inserted is pushed forward by a propulsion device 14 at the end of the mandrel 6 to penetrate into the eccentric ring roll 4.The eccentric ring roll hole type 1) 2 and the hole type Di of the supporting ring roll
, D3 as shown in FIGS. 1 and 2.

The tube is supported on the grooved surface of the bearing ring roll, so selected that the active surface of the eccentric ring roll is pushed into the tube. FIG. 2 is a 1-1 cross section of FIG. 1, and shows an example of an eccentric rotation mechanism of an eccentric ring roll.

That is, when the gear 9 is supported on the housing 11 and rotated, the inner surface 13 of the gear whose center is different from the gear center rotates eccentrically, and the eccentric ring roll 4 supported on this surface and its hole shape D
2 performs eccentric rotational movement. At this time, the center of the hole D2 performs a circular motion with a radius LK about the outer circle center Ki of the housing 11 and the gear 9. When the eccentric ring roll 4 is moved in this way, the part that is pressed and plastically deformed by the holes D2 of the eccentric ring roll (the part moves in the circumferential direction of the pipe, and the wall thickness of the entire circumference of the pipe is reduced) There is one thing.

Reduction in the wall thickness of the pipe is also caused by the bearing ring roll part due to the pressing force of the eccentric ring roll 4, and the plastic deformation part is approximately 180 degrees different from the plastic deformation part of the eccentric ring roll part.
It rotates in the same direction at 6 angles, and the thickness of the entire circumference is reduced.

In the present invention, as shown in FIG. 3A, by applying a hole D2 having 21 undulations in the direction of movement of the long column to the eccentric ring roll 4, the protrusion of the hole D2 is pushed into the long column. This enables efficient processing. In particular, when the undulations 21 of the eccentric ring roll hole type E2 are spirally connected and have a female thread shape as shown in FIG. The relative movement ensures efficient machining and increases machining speed. The direction of the relative movement between the two is, when the shape of the ring roll 4 is a right-handed screw as shown in Fig. 3B, and when the elongated column moves from left to right in the same figure without rotating, the ring roll The rotation direction of No. 4 is clockwise rotation when viewed from the exit side (right side in the figure).

Specific examples are shown in Table 1. Example 1 is when the vertical cross sections of the holes Di, D2 and D3 are all circular arcs as shown in Figure 1D31.Example 2 is when these hole shapes DI, D2゜1)3 are all shown in Figure 3A. Examples 1 and 3 of the present invention have bellows-like undulations 21 as shown in FIG. Conditions other than these hole shapes were the same for all three, and the material was advanced by pushing the mandrel 6 at a rate of 10 + nm/S. The exit speed of the rolled material at this time is Example 1
4, 9, 13 N in 9 cases 2, 91) 3, respectively
/3, which is twice as much and more than three times as much in Examples 2 and 3, respectively.

The effects of this invention are evident.

In the case where the thread-like undulations shown in FIG. 3B are applied to all the hole types in the present invention, it is preferable to set the pitch of the thread-like undulations of the first ring roll to a range of I'n f order.

However, A, , A are the cross-sectional areas of the front reed or the rear long column processed by the first ring roll from the entry side, respectively.
Ao is given as the cross-sectional area of the material, and is determined by hole design as a value that gradually decreases after A2. Also P.

IS IJ roll holding member 1 material entry length t. A slightly larger koki is preferable. Its upper limit is about twice the extension (An-1/A), and this range is P. If it deviates too much, the surface of the long column may be scratched due to the thread-like undulations, but by interrupting the undulations, the range of Pn can be expanded and the degree of freedom for one operation can be increased.

(Effects of the Invention) As described above, in the present invention, when rolling a material with a ring-shaped tool, rolling is performed so that the protrusions provided on the ring-shaped tool are pressed against the material to an appropriate size.

Efficient processing is carried out, making it possible to downsize the equipment and speed up processing◇ (Application field of the invention) The present invention continuously processes a long column of plastically workable material in its length direction. It can be applied to the field of machining, for example, when machining pipes and rods into cylinders or prisms, or when efficiently forming screws, fins, protrusions, and holes on their surfaces.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an example of an apparatus for carrying out the present invention;
FIG. 2 is a sectional view taken along line 1-1 in FIG. 1, and FIGS. 3A and 3B are examples of the hole shape of the present invention. 4... Eccentric ring roll, 3, 5... Supporting ring roll, DI, D2. D3... Hole W of ring roll or supporting ring roll, 6... Mandrel, 7... Pipe. 8... Mandrel axis, 9... Gear, 10...
Rotation direction of gear, 14... Propulsion device, K... Mill center line. ], . . . ring roll hole type center shaft, 21 . . . bellows-like protrusion.

Claims (1)

[Scope of Claims] 1. Relative motion between a tool forming a bus in which the inner surface of the ring-shaped tool narrows while undulating in the direction of movement of the long column in a bellows-like manner, and the long column inserted into the ring-shaped tool. A method for processing a long columnar body, characterized in that the long columnar body is processed in a spiral shape. 2. The method according to claim 1, wherein the inner surface of the ring-shaped tool is screw-shaped, and the two are moved relative to each other in a direction of advancing the screw toward the unmachined portion of the long column. 3. The method according to claim 1 or 2, in which the bellows-like undulations are intermittent.