JPH0254165B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for processing a long column such as a tube or a rod (hereinafter referred to as a tube or rod). (Prior art) Pipes and rods have traditionally been manufactured using 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, the inventors have already filed a patent application filed in 1983-
No. 5808 and Patent Application No. 58-7385 are 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. Supporting ring rolls 3 and 5 are disposed as supporting 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 D2 and the support ring roll hole type D
The dimensions and positions of 1 and D3 are selected in such a way that the tube is supported on the slotted surface of the bearing ring roll and the working surface of the eccentric ring roll is pushed into the tube, as shown in FIGS. 1 and 2. FIG. 2 is a - 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 D2 perform eccentric rotational movement. Let's do it. At this time, the center L of the hole D2 performs a circular motion with a radius around the outer circle center K of the housing 11 and the gear 9. When the eccentric ring roll 4 is moved in this way, the hole shape D of the eccentric ring roll is
The portion that is pressed and plastically deformed by 2 moves in the circumferential direction of the tube, and the wall thickness of the entire circumference of the tube is reduced. Reduction in the wall thickness of the pipe also occurs in the bearing ring roll section due to the pressing force of the eccentric ring roll 4, and the plastic deformation part is the same as the plastic deformation part of the eccentric ring roll part at an angle that is approximately 180 degrees different. direction, and the thickness of the entire circumference is reduced. In the present invention, as shown in FIG. 3A, by applying a hole D2 having undulations 21 in the direction of movement of the long column to the eccentric ring roll 4, the protrusions of the hole D2 are formed on the long column. This allows for efficient machining. In particular, as shown in Figure 3B, when the undulations 21 of the eccentric ring roll hole type D2 are connected in a spiral shape and have a female thread shape, both of them are moved in the direction in which the screw advances toward the unprocessed part of the long column. Relative movement ensures efficient machining,
Machining speed increases. The direction of relative motion between the two is
When the shape of the ring roll 4 is a right-handed screw as shown in Fig. 3B, and the long column moves from left to right in the figure without rotating, the rotation direction of the ring roll 4 is on the exit side ( This is a clockwise rotation when viewed from the right side of the figure. Specific examples are shown in Table 1. In Example 1, if the vertical cross sections of the holes D1, D2, and D3 are all circular arcs as shown in FIG.
Example 3 is an example of the present invention in which all of the holes 2 and D3 have bellows 21 as shown in FIG. 3A.
1, D2, and D3 are all examples of the present invention having thread-like undulations 21 as shown in FIG. 3B. Conditions other than these hole shapes were the same for all three, and the material was advanced by pushing the mandrel 6 at 10 mm/s. At this time, the exit speed of the rolled material was 4, 9, and 13 mm/s in Examples 1, 2, and 3, respectively, and the speeds in Examples 2 and 3 were more than twice and three times, respectively, compared to Example 1. The effects of the invention are appearing.

【table】

[Table] When the thread-like undulations shown in FIG. 3B are applied to all hole types in the present invention, it is preferable to determine the pitch P _o of the thread-like undulations of the n-th ring roll within the following range. P _o-1 ≦P _o ≦2A _o-1 /A _o P _o-1 (n=1, 2...) However, A _o-1 and A _o are respectively before processing with the nth ring roll from the entry side. or the cross-sectional area of the later long column body, where A ₀ is given as the cross-sectional area of the material,
After A ₂ , the values are determined by the hole design as gradually decreasing values. Further, it is desirable that P ₀ is slightly larger than the material entry length l ₀ per one rotation of the ring roll holding member. The upper limit is approximately twice the extension (A _o-1 /A _o ), and if P _o deviates significantly from this range, the surface of the long column may develop flaws due to the thread-like undulations. By making the undulations intermittent, the range of P _o can be expanded and the degree of freedom of work 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 pushed into the material. Therefore, efficient machining can be performed, and the equipment can be made smaller and the machining speed can be increased. (Field of Application of the Invention) The present invention can be applied to the field of continuously processing a long columnar body of plastically workable material in its length direction. It can be applied to efficiently form screws, fins, protrusions, and holes on the surface.

[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 cross-sectional view taken from FIG. 1, and FIGS. 3A and 3B are examples of hole shapes of the present invention. 4... Eccentric ring roll, 3, 5... Support ring roll, D1, D2, D3... Hole type of ring roll or support ring roll, 6... Mandrel, 7... Tube, 8... Axis center of mandrel , 9...
Gear, 10... Rotation direction of the gear, 14... Propulsion device, K... Mill center line, L... Ring roll hole type center shaft, 21... Bellows-like protrusion.

Claims (1)

[Scope of Claims] 1. A tool whose inner surface gradually narrows while undulating in the direction of movement of the long column in the direction of movement of the long column, and a long column inserted into the ring-shaped tool are mutually connected. While being pressed in the radial direction, one or both of the center axis of the eccentric ring roll and the center axis of the long column is advanced while advancing the long column so that the surface of the long column follows a spiral trajectory and the processing progresses. A method for processing a long columnar body, which is characterized in that the is rotated around a path center line. 2. The inner surface of the ring-shaped tool is thread-shaped, and processing is performed by relatively moving the center axis of the eccentric ring roll and the center axis of the long column in the direction of advancing the screw toward the unprocessed part of the long column. A method for processing a long columnar body according to claim 1. 3. The method for machining a long columnar body according to claim 1 or 2, which comprises machining using a ring-shaped tool in which bellows-like undulations are interrupted in the circumferential direction.