JP812H - Arc-shaped bending method for pointed shaft rod - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for bending a pointed metal shaft or the like into an arc shape. A method for bending a pointed shaft into an arc by inserting and winding the pointed shaft between the two by means of is. As a conventional circular arc bending method of this kind, a wide variety of shaft rods P as shown in FIG. A press method for circular arc bending by using an upper die 3 for bending, or by using a side die 4 in addition to the lower die 2 and upper die 3, three as shown in FIG. Circular bending methods such as a three-roll method using rolls 5 and 6 and an elastic two-roll method using a urethane rubber roll 7 and a steel roll 8 have been developed and put into practical use. However, the pressing method requires expensive working dies, is unsuitable for materials with large spring back, and has disadvantages such as damaging the processed material during pressing. In addition, the point-shaped processed material has the disadvantage that the tip bends, and the elastic two-roll method applies a force greater than the force required to bend the processed material to the steel rolls. In the case of timber, there was a drawback that the tip of the processed material pierced the urethane rubber roll and damaged it. The method according to the present invention relates to a completely new technology developed in view of these drawbacks of the prior art. One embodiment of the method according to the present invention will be explained in detail with reference to the drawings. In FIGS. A groove 11 is bored in a part. Reference numeral 12 denotes a thin steel belt having a thickness of about 0.01 to 1.0, the tip of which is fitted into the groove 11 of the roll 10 and fixed. 13 is a stand on which the belt 12 is placed, P is a shaft, 14 and 14' are bearings, and 15 is a drive gear. In carrying out the processing method according to the present invention, Fig. 7 (A),
As shown in (B) and (C), the shaft P is placed on the belt 12 at a position close to the roll 10, then the roll 10 is rotated to wind the belt 12 around the roll 10, and at the same time the roll
A shaft P is wound between the belt 10 and the belt 12, thereby bending the shaft P along the circumference of the roll 10, and stopping the rotation of the roll 10 when the shaft P advances to a predetermined position. Subsequently, by rotating the roll 10 in the reverse direction, the belt 12 and the shaft P are returned to their original positions, and in this state, the shaft P that has been bent can be taken out. Although the end of the belt 12 is free in the above embodiment,
As shown in FIG. 8, it is also possible to apply tension to the coil spring 16 or the like, and instead of fixing the tip of the belt 12 with the groove 11 as described above, the roll 10 is secured with screws 17 as shown in FIG.
can also be fixed to In order to make the above-described bending work even smoother, it is also possible to use an auxiliary bending plate 20 as shown in FIG. 10 in addition to the apparatus shown in the above embodiment. In this case, the auxiliary plate 20 is supported on the table 13 by the spring 21, the belt 12 is placed on the auxiliary plate 20, and the roll 10 and the belt 12 are used to wind and bend the shaft P. The plate 20 allows smooth bending. When this auxiliary plate 20 is used, it is possible to prevent wear of the belt 12, especially partial elongation and deformation of the belt 12, or formation of irregularities, etc., as compared with the case of not using the auxiliary plate 20, and the belt 12 can be made to last longer. In addition, the auxiliary plate 20 can be slightly inclined as necessary to uniformly and smoothly press the belt 12 and the axial rod P wound together with the belt 12, especially the tip portion, against the surface of the roll 10, so that the front Even the pointed shaft P can be bent in a uniform curve without being bent, and the auxiliary plate 20 acts as described above, so the shaft P
This has the effect that a thin belt 12 can be used with respect to the thickness of . This auxiliary plate 20 may be fixed to the base 13 via springs 21 or the like as described above, or as shown in FIG.
It is placed on a rail 22 fixed to 13 via a spring 21 via a bearing 23, and moves along with the movement of the belt 12.
It can also be mounted so that it can slide synchronously with the belt 12 along 22. 10 and 11, reference numeral 18 denotes a storage box for the long belt 12, which is supported by a spring 16. As shown in FIG. Furthermore, in the above embodiment, the shaft P is wound between the roll 10 and the belt 12, and the general processing method of bending the shaft P by this winding pressure was described. For completeness or when the shaft P is to be press-molded into a flat shape, as shown in FIG. A cylinder 31 is installed under the press table 30 and capable of pushing the press table 30 up to a predetermined position. When winding between the press table 30
and the auxiliary plate 20 are forcibly pushed up, and the gap between the auxiliary plate 20 and the roll 10 is set to be less than the sum of the thickness of the belt 12 and the thickness of the shaft P, thereby bending the shaft P while pressing it. It can be processed, press-molded into a flat shape, and bent into an arc shape at the same time. Furthermore, if the auxiliary plate 20 is partially forcibly pushed up, it is natural that a partially pressed product can be obtained. Also, by changing the distance between the auxiliary plate 20 and the rolls 10 during processing, for example, the shaft P shown in FIG. Similar shapes can be manufactured in one step. When the shaft P is placed on the belt 12, as shown in FIG. As shown in FIG. 14, when the shaft P is obliquely placed on the roll 10, it is possible to obtain a spiral curve. As described above, the belt 12 in the above embodiment does not necessarily have to be fixed to the roll 10 at its leading end. Furthermore, it is also possible to tension the long belt 12 along the roll 10 . Rolls 10 of various diameters are prepared, and by replacing them, bending of various radiuses is of course possible. By changing the position of the belt 12, it is also possible to perform bending of various radiuses. In addition, by denting only the portion around which the shaft P of the roll 10 is wound, the shaft P as shown in FIG.
can be smoothly bent, and by guiding the shaft P into the groove, as shown in Fig. 14, the shaft P
It is also possible to prevent oblique insertion of the
Furthermore, by setting the depth of the grooves, it is possible to make the press thickness the same as the depth of the grooves. rod shaft P
It is also possible to transfer this unevenness to the surface. Moreover, the roll 10 is not a perfect circle, and the shaft P can be deformed and curved by using a deformed roll such as an elliptical roll. As described above, the processing method according to the present invention uses rolls and strong belts, and rolls shafts between them for bending. It can be processed very smoothly with a small force, and in particular, the tip of the pointed shaft can be curved to a uniform R without bending, so that the sharpened shaft, such as a suture needle, etc. Unlike the conventional machining method, there is no risk of damaging the surface of the shaft rod or excavating the surface of the working roll, and furthermore, when machining a material with a large spring back. can be completely bent by winding it continuously several times between the roll and the belt, and by adding an auxiliary plate to the combination of the roll and the belt, the shaft can be bent. Processing can be made smoother, a thinner belt can be used, and the belt can be protected and made to last longer. A shaft rod can be pressed into a flat shape during bending work, and processed products which are bent into a predetermined shape and simultaneously press-formed into a flat shape can be manufactured easily and in large quantities, and the present invention can be used. The product obtained by carrying out the method has the characteristic that a high-quality product can be obtained that has no flaws, no bending of the tip, and a uniform bending process.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing the shape of the shaft, FIGS. 2 to 5 are explanatory diagrams showing a conventional machining method, and FIGS. 6 and 7 show the present machining method. 8 to 12 are explanatory diagrams showing other working methods, and FIGS. 13 and 14 are explanatory diagrams showing bending directions of the shaft rod. P: Axle, 2, 3, 4: Press die 5, 6, 7, 8: Roll, 10: Roll 12: Belt, 14: Bearing, 20: Auxiliary plate 22: Rail, 30: Press table, 31: Cylinder .

Claims (1)

[Corrected Description] [Claims] [Claim 1] A pointed shaft rod is inserted between a cylindrical roll and a strong thin belt which is wrapped around at least a part of the outer peripheral surface of the roll while being pressed against it. In addition, part or all of the pointed shaft is bent into an arc shape by driving and winding only the cylindrical roll or both the cylindrical roll and the thin belt. A method for bending a sharp-pointed shaft rod in the form of an arc. 2. A method for bending a sharpened axial rod into an arc shape according to claim 1, wherein the tip of the thin belt is attached and fixed to a part of the roll. 3. A tipped shaft is inserted between a cylindrical roll and a belt, and when the cylindrical roll alone or both of the cylindrical roll and the belt are driven to perform the winding process, A pointed shaft is formed by pressing the belt against the roll from the outside of the belt at right angles to the radial direction of the roll with respect to the initial portion where the belt wraps around the roll with a provided auxiliary plate. A method for bending a pointed axial rod in an arc, characterized by bending the rod. 4. The arc-shaped bending method for a pointed shaft rod according to claim 3, wherein the auxiliary plate is constructed to move in synchronism with the belt. 5. Inserting a pointed shaft between a cylindrical roll and a belt and assisting winding by driving only the cylindrical roll or driving both the cylindrical roll and the belt. Press working is added to the pointed shaft during bending by forcibly positioning the spacing of the plate to the rolls to be less than the sum of the thickness of the pointed shaft and the thickness of the belt. Arc-shaped bending method for a pointed shaft rod. 6. The tip according to claim 5, wherein the forcible spacing of the auxiliary plate with respect to the roll is intermittently or the position is changed during processing. arc-shaped bending method of a shaped shaft rod.